Q: What is the valve on the back of a 4041/4040XP closer used for?
A: The valve on the back of a 4041/4040XP closer is a "Back Check Selector Valve" that needs to be turned in on "Parallel Arm" mount applications ONLY. If a 4041/4040XP closer mounted "Top Jamb", or "Pull Side", and there is no backcheck, the closer could be defective. Check all templating, and settings
Q: During your last visit I forgot to ask you about another small project here that I am hoping your crew can help us with. The 2nd floor doors to the courtyard open to the inside of the building (closers are on the outside door side). I’ve learned that last year this caused serious issues with the doors blowing open from the outdoors and kept the 2nd floor super cold all winter. the building engineer suggests that by swapping the closers to the inside, the doors will be pulled shut better. I’d like your input to see if this can be done and at what cost. I’ve attached a few pics to save you a trip. We’d love your help on this. Photos here::
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A: I do not believe that installing door closers on the interior side is going to correct this at all because the problem is you are parallel arm mounting them meaning that the arm is parallel to the face of the door and the closer is substantially less efficient at getting the door pulled closed and shut tight. The existing closer installation was not the best choice for the original specifier to have made as the the closers ought to be on the inside and out of the weather. I can see why the original installer placed them on the exterior because the relationship of the frame to the door on the pulll side of the opening would not permit a standard regular arm type mount because of the reveal from the face of the header to the face of the door and while you can likely make a double egress arm work, I don't believe that you'll achieve any advantage and pulling the door is closed.
I can certainly sell you the part you need to move everything to the inside but again I don't expect it's going to work as it is taking the same compromised mechanical installation and simply repositioning it to the interior.
What I suggest you do is simply install those closers the existing closers in the top jamb orientation as seen here:
Download File
as the top jamb orientation is mechanically far more capable of pulling the door closed and shut.
Initially and before you make any changes you might want to increase the spring power because the closer that's there is fully spring adjustable as well.
I have also had locksmith clients of mine literally install a closer on both sides of the door however you can expect substantial force required to push that door open.
I have located the installation instructions at the link as seen here:
Download File
Be mindful that being compliant with handicap access, document A117.1 would be mandatory by law which calls out a maximum of 5 lb of force applied to the door. This means that there was a reduced opening force and with a reduced opening force naturally comes a reduced closing force.
Q: Thank you for the info, very useful! From what I was told the main problem is during winter time because the closers are mounted on the outside. Please provide a quote to supply new Bronze door closers and whatever parts I will need to remove the existing and install new closers on the inside. Management thinks that moving the closers to the inside might solve the problems; however the existing closers are falling apart I don’t think we should re-use them.
A: Sure thing but, from your photos, I will need a few dimensions to determine if a closer is capable to be mounted within this space. For your photos the drawing here:
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Appears to match. Please create a cross-section and provide the dimensions as seen in the circled areas.
Q: Please see attached dimensions you have requested:
Download File
A: The images you have provided make clear the application and I am happy to report the ideal solution for this application.
I would suggest to you the following items:
First you will need the Door Closer 4014T DE x hand x MC x Bumper x Dark Bronze 695 x TBTRX - LCN
and the:
Drop Plate 4010T-18 x Dark Bronze 695 - LCN
A Highlited Cut sheet can be reviewed here:
Download File
And the instalaltion instructions for your review here:
Download File
Be mindful the 4014 is a non-ADA compliant spring power in the door closer. Your original problem is the door closers currently installed are not getting the doors fully closed. It is likely they are ADA compliant door closer bodies, however (as it was said to me many years ago by a door closer engineer) with a reduced opening force, comes a reduced closing force.
It will likely very firmly pull the door closed, but will not comply with the maximum 5lbs of opening force for an opening mandated to be ADA compliant.
I have prepared a quote and have sent it to your email.
Q: Are LCN -16 and -17 corner brackets still available for purchase?
A: The LCN -16 and -17 corner brackets are obsolete and no longer available from LCN.
Q: Which closer is the heaviest duty?
A: The 4010, 4020, 4110, and 4040/4040XP are heavy duty closers.
Q: Can I use the 4040/4040XP in high traffic areas?
A: The 4041/4040XP is a heavy duty door closer, designed for high traffic areas.
Q: What is the part number for a 4040 cover?
A: The 4040 cover is ordered as part number 4040-72 as seen here:
Click Here
Q: What is the part # for the 4040 regular arm?
A: There are two regular arms for the 4040 series which are:
4040-3077 for a regular arm.
4040-3077L for a long (regular) arm (this arm is used for a deeper than average reveal).
As an aside, the 4040 regular and hold open arms are different. You would have to get a different arm to convert from regular arm to a hold open function.
4040-3049 for hold open arm.
4040-3049L for long hold open arm. Q: Can the fluid in an LCN door closer be filled out in the field?
A: The fluid in an LCN closer must not be refilled in the field.
Please see the Warranty and Repair Communication here:
Download File
Q: Can you install a 4041 pull side at 180 degrees?
A: The maximum opening is 120° with the 4041/4041XP standard templating on the pull side of the door. you can however when you install the closer in a Parallel Mount fashion as seen in the manufacturers template here:
Click Here
Q: Are Lead Lined covers needed for LCN Closers?
A: The determination was made that Lead Lined covers are no longer needed for the LCN product line, see below Marketing/EHS document as seen here:
Download File
Q: What is a Finger Guard or Safety Guard?
A: The LCN Safety (Finger) Guard was a heavy duty vinyl product that covered the opening between the door and frame, where most hand injuries occur.
The LCN 750 Safety (Finger) Guard was the pull side version as seen here:Click Here
The LCN 700 Safety (Finger) Guard was the push side version as seen here:Click Here
Both limited door swing to 100°.
Came in 82" lengths, trimmed to fit in field.
Carried a two year warranty.
Used for Butt Hinges only. Q: What does thick hub shoe stand for?
A: Substituted for soffit shoe on EDA arm to clear blade stop
Q: How can I make my regular arm closer mount parallel arm?
A: This can only be done with universal, non-handed closers: 1250, 1260, 1450, 1460, 4030, 4040XP, and 4050A.
You would need an xxxx-62PA shoe to adapt from regular arm to parallel arm mount.
Example: If you have a 4040XP closer, then order a 4040XP-62PA.
Q: What LCN closer has the strongest closing force?
A: The size 6 handed closers will have the most (strongest) closing force. The 4016 (pull side), the 4026 (top jamb push side) or the 4116 (push side parallel arm) have the highest closing force.
Interestingly enough I have seen locksmiths install these closers one on each side of the door to control extremely windy conditions can I have witness this on the lakefront in chicago on what we would call the Gold Coast and up north to Evanston where there are scores and scores of mid-story condominium buildings.
Q: Does LCN have a closer or operator for sliding doors?
A: LCN does not offer any products for sliding doors.
Q: What are the Rod and Shoe lengths for 4000 and 1000 series closers?
A:
STANDARD ROD AND SHOE: 4020, 4031, 1460, 1520, 1370, 1070, 1260, 4640, 4820 is: 8 3/8”
LONG ROD AND SHOE: 4020: 4031, 1460, 1520, 1370, 1070, 1260, 4640, 4820 is: 12 3/8”
STANDARD ROD AND SHOE: 4040(XP), 4010 is: 6 3/8”
LONG ROD AND SHOE: 4040(XP) is: 8 3/8”
EXTRA LONG ROD AND SHOE: 4040(XP) is: 12 3/8”Q: Do I need to order the LCN 4040XP closer X ST-3596 to get the cover screw to secure the snap on cover to the cylinder?
A: According to the manufacturer:
As of June 27th, 2018--- the cover screw is now standard in the screw packs for the 4040XP, 4040XPT, 4000T, and 4040SE so ST-3596 is no longer needed.
Q: What is the 4310HSA/4410HSA series closer?
A: The HSA is an electrically controlled closer/holder designed to provide easy passage for groups of pedestrians through high traffic doors.
- In 2006, we changed the Scanner in all HSA units to a smaller design. If the customer has an old unit prior to 2006, they can replace the old scanner with the new (current) scanner but they would need to take the plastic window cover out of the metal cover for the unit to function. The only downfall is that this will leave an open cutout in the cover.
- 11/15/2009, The HSA series was discontinued, and could be replaced by the 4314ME/4414ME series closers with the optional "B80" cylinder. Then use an additional sensor like a "Scan II" in conjunction with the "ME" closer. The Scan II will control the hold open feature when the door has power applied to it. See Point to Point wiring diagram here.
- 3/18/2013, The 4310HSA/4410HSA Series was re-introduced back to the product line, eliminating the need to replace the older version with an "ME" closer.
Q: What is the thread size on LCN thru bolts?
A: The LCN Thru bolts accept 1/4-20 thread.
LCN thru bolts are made of steel with zinc plating.
Q: Hey Richard, Please see the attached for photo as seen here:
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of existing manual closer. We have a customer that is having some air pressure issues. Door will hang open when air is on. The customer has adjusted their existing closer as much as possible. Is there a more heavy duty closer to replace this manual door closer with? Something with more adjustment or setting to combat the air pressure issues, but isn’t too hard to open. Please advise. Thanks.
A: The old saying goes as you increase the closing force you increase the opening force - you can definitely get it to close but you are definitely going to encounter more opening force required - having said this I would suggest installing that closer as a top jamb mount as it ought to and will perform more effectively at keeping the door closed - have also seen two door closer bodies installed stacked on top of each other with a coupler and the additional door closer as detailed here:
Download File
Q: How do I get a Size 1 (ADA) closer to close against air pressure?
A: If an Size 1 (ADA) closer is set to 5 lbs. opening force, it will only have about 3 lbs. (60/70%) closing force. If the closer will not close against air pressure, but the ADA requirements have to be met, they may have to change to an automatic operator with a "power boost" option (Senior Swing) if there is that much pressure. If ADA does not have to be met you can increase the spring power on the end of the closer.
Q: What special template (ST) is used with a 4040XP with a non-adjustable (solid) regular arm for pull side mounting?
A: Special Template ST-2795 is used to mount a non-adjustable (solid) regular arm for pull side mounting.
Q: On which closer is the fusible link arm available?
A: The Fusible Link arm is available with the 4010, 4020 and 4110 series closers. They all use the same Fusible Link arm. The UL Listing number is for the Fusible Link arms is R1943.
The 4010 Series can be templated for 100° or 140°.
The 4110 and the 4020 Series can be templated for 100°, 140°, or 180°.
Fusible Link arms closer are NOT recommended to be used as a Fire Life Safety device in "Occupied Areas".
The local "AHJ" (Authority Having Jurisdiction) always has the final decision, therefore, "ALWAYS" consult the local "AHJ" and local codes before specifying a fusible link arm closer.
Q: What size machine screws are used with thru bolts and a 2-3/4" thick door and a 4040 closer?
A: A 4040 closer mounted with thru bolts on a 2-3/4" thick door would require 1/4-20 X 3-1/2" machine screws.
Q: What LCN closers are available in a tri-pack mounting?
A: The 4040XP, 1260/1261, 1460/1461, 4030/4031 closers have the tri-pack mounting option when ordered with an Rw/PA or Hw/PA designation.
Q: Can a 4040 regular mount installed on the pull side and a Glynn Johnson 90 be mounted together?
A: The LCN 4041/4040XP and the Glynn Johnson 90 series can be mounted in conjunction with each other without a special template. The 4040 door closer is on the pull side of the door and the GJ 90 is on the push side of the door.
A conflict may occur between the Glynn Johnson 90 thru bolts and the door closer cylinder. If this occurs, the 4040-18 drop plate would be used and the plate drilled out to provide clearance for the thru bolt heads.
Q: What closer can be used with Soss invisible hinges?
A: Practically all closers can be used with Soss hinges. The Soos hinge needs to be specified at the time of order as using Soss hinges with closers can require special device and preparation locations. If you have questions on specific closer applications, please e-mail your request including a description of the device, application and the opening configuration to Product Support for Closers.
Q: When did they start putting the green dials on the 4041 closers?
A: LCN started putting on the green dials for the spring adjustment on the 4041s in 2001.
Q: How do you identify the model number and date code of an LCN cast iron hydraulic closer?
A: The date is a 4 digit #. The first 2 numbers indicate the week it was made, and the last 2 numbers indicate what year it was made.
On most surface mounted closers, the model #, date code, and in some cases the shift made are stamped into the packing nut around the closer pinion shaft. For example see here.
On overhead concealed mounted closers, the model # and date code is either stamped on the back of the closer, on the inside of the mounting plate, or on packing nut. The closer must be removed from the frame to locate the model # and date code. In some cases the mounting plate has to be removed from the cylinder to see the DOM on packing nut. Q: What is the maximum door weight recommended for LCN closers?
A: The maximum recommended door weight for LCN closers is 225 lbs.
Q: Is there a retrofit closer available for the obsolete 303 OHC closer?
A: The LCN direct retrofit for the Obsolete 303 OHC closer was the 330 series, it was discontinued in 2009. The 3030 closer door closer body can be used as a replacement cylinder.
Q: Where is the date of manufacture on a 4041 closer?
A: The date stamp on a 4041/4040XP is on the packing nut. The date will be the week of the year and then the year.
EXAMPLE: 10 05 would be week 10 of 2005. For example see here:
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Q: Can a 4040 open to 180°?
A: The 4040/4040XP closer mountings have the following maximum opening degree templating:
The 4040/4040XP PA "Regular Arm" mount will allow for 180° max. opening.
The 4040/4040XP "Pull Side" and "Top Jamb Push Side" templates allow for a maximum opening of 120°.
The 4040/4040XP EDA "Push Side" can be templated for 110° or 180°
The 4040/4040XP Cush "Push Side" can be templated 85°, 90°, 100°, or 110° of opening. (The 4040/4040XP must be installed to the 100° or 110° template to meet the ADA requirements).
The 4040T/4040XPT "Pull Side" templates allow for a maximum opening of 120° with standard track offering.
The 4040T/4040XPT "Top Jamb Pull Side" template will allow a 180° opening.
The 4040T/4040XPT "Stop Face Push Side" template allows a maximum opening of 120°.Q: What is the minimum clear opening width required by ADA on a single door?
A: The minimum clear opening width for ADA is 32" measured from face of door opened to 90 degrees to face of stop on strike jamb. There must be no hardware mounted to the door projecting into the clear opening from finished floor to 34" above the finished floor and no hardware projecting more than 4" into the clear opening from this point to the top of the door.
Q: Can a Glynn Johnson 90 stop be used with a top jamb mounted 4040?
A: A 4040-18G drop plate will be needed to drop the closer and arm down far enough not to conflict with the GJ 90 series overhead stop.
Q: What special template (ST) is used with a 4040(XP) Rw/PA mount closer and a GJ overhead stop?
A: The use of a 62A Shoe (required) would be used to mount a 4040XP Parallel Arm with a "SURFACE" GJ 70, 79, 81, 90, or 450 series stop. You would order the 4040XP with a Reg w/62A arm option. This option became standard product on 3/22/21 and no longer requires an ST, which was ST2776. The use of the 4040XP-62A shoe instead of the 4040XP-62PA shoe will drop closer down on the door so there is no conflict between the GJ and the closer.
ST2742 is used with the GJ79HD series.
No "ST" is required to mount a 4040XP Rw/PA series closer with a "CONCEALED" GJ 100 or 410 series stop. If a 4040-18PA plate is used with a GJ100H. (must drill a clearance hole in plate for the "hold open knob" on the GJ100H)
ST-1630 is required when mounting a 4041 or 4040XP door closer regular (pull/hinge) side with a concealed GJ100 or GJ410 series over head stop. This ST requires the 4040XP-18TJ Drop plate, which must be order separately.
Q: What are the LCN standard finishes?
A: The current Powder Coat finishes are:
Aluminum (BHMA 689)
Dark Bronze (BHMA 695)
Brass (BHMA 696)
Light Bronze (BHMA 691)
Statuary Bronze (BHMA 690)
Gloss Black (BHMA 693)
Matte Black (BHMA 622) -- Added on June 27th, 2022 on Manual closers only(see note).
Information on LCN Finishes can be found in the General Section of our catalog, see here:
Download File
NOTE: LCN added Matte Black on June 27th, 2022 as a standard finish available on all LCN Manual Closers only. Matte black 622 will NOT be available for auto operators and fire life safety products at this time. This includes the Sr. Swing(ST3625). Also, changed description of std Black (693) to Gloss Black (693).
Tan Powder Coat can be ordered but only available as a special finish with a metal cover.
White Powder Coat can be ordered as a special RAL finish with a metal cover.
Q: What is the narrowest door a 4040 pull side will mount on?
A: 14" door leaf is the narrowest with standard template.
Q: Is the 4041/4040XP and the 4040SE cylinder body the same?
A: The 4041/4040XP and 4040SE closers cylinders are "NOT" the same.
The 4041/4040XP cylinder has an adjustable size 1-6 spring.
The 4040SE cylinder has an adjustable size 2-4 spring.
The 4041/4040XP and the 4040SE covers "ARE" the same. Q: Can I use a Glynn Johnson 410 with a 4040 regular (pull side) mount?
A: The ST-1630 as seen here:
Click Here
is required when mounting a 4041 or 4040XP door closer regular (pull/hinge) side with a concealed GJ100 or GJ410 series over head stop.
Q: What is the difference between the 4040, 4010, 4020, and 4110 series closers?
A: 4040XP Series (4040 DEL) is a universal closer. *(see note)
Non Handed closer. Can be mounted on a RH or LH door.
4041XP - Adjustable size 1 to 6.
Can mount push side or pull side of the door.*(see note)
Non Handed arms with the exception of HEDA arms are handed.
Non Handed cover.
Handed metal cover.***
The mounting hole pattern of a 4040XP/4041 is a "staggered hole pattern" 2-1/4" vertical center of top corner to center of bottom corner mounting holes, and 5" horizontal center of top corner to center of bottom corner mounting holes.
4010 Series is a handed closer. **(see note)
Regular arm pull side mount closer.
Same closer body as 4020.
4011 - Adjustable size 1 to 5.
4016 - Size 6 only.
Regular arms are Non Handed. The Hold open arms are handed.
Non Handed plastic cover. (plastic cover same as 4110)
Handed metal cover.***(see note)
The mounting hole pattern of a 4010 series is 2-1/2" vertical from center to center of mounting holes, and 6" horizontal center to center of mounting holes.4020 Series is a handed closer. **(see note)
Regular arm push side top jamb mount closer. (longer rod and shoe than 4010)
Same closer body as 4010.
4021 - Adjustable size 1 to 5.
4026 - Size 6 only.
Regular arms are Non Handed. The Hold Open arms are handed.
Handed plastic cover. (plastic cover different than 4010/4110)
Handed metal cover.***(see note)
The mounting hole pattern of a 4020 series is 2-1/2" vertical from center to center of mounting holes, and 6" horizontal center to center of mounting holes.4110 Series is a handed closer. **(see note)
Parallel arm push side mount closer.
4111 - Adjustable size 1 to 5.
4116 - Size 6 only.
EDA, Cush, and HCush are Non Handed arms. The HEDA arm is Handed.
Non Handed plastic cover. (plastic cover same as 4010)
Handed metal cover. ***(see note)
The mounting hole pattern of a 4110 series is 2-1/2" vertical from center to center of mounting holes, and 6" horizontal center to center of mounting holes. Q: Is there adjustment limits on the regulation valves of LCN manual closers?
A: The regulation valves are designed to adjust the flow the hydraulic fluid in the closer which regulates the door closing speed through various phases of the closing cycle. The regulation valves have limited adjustment and if opened up too far can cause damage to the seals and create hydraulic fluid leaks. The regulation valve assemblies are staked to provide some warning when the screws are at max adjustment but they cannot prevent the valve from being over adjusted.
The most common reason why users over adjust the regulation valve is to create more force to ensure the door latches during closing. Opening up or adjusting the latch speed will increase the latch speed but does not increase the closing force provided for latching the door, if more force is needed to latch the door the spring power should be increased.
The following information is a guide to ensure the regulation valves are not overly adjusted:
Shut off position: Shut off the valve by rotating it clockwise until it stops rotating
1 turn out from shut off position: Very slow regulation / speed
1 ½ turns out from shut off position: Slow regulation / speed
2 turns out from shut off position: Normal regulation / speed
2 ½ turns out from shut off position: Fast regulation / speed
3 turns out from shut off position: Very Fast regulation / speed
3 ½ turns out from shut off position: No Regulation, door will slam
3 ½ turns out from shut off position: Risk of damaging seals – No impact to regulation or speed
We do not recommend opening / adjusting the regulation valves more than 3 full turns from the shut off position.
Q: What maintenance is required for an LCN closer?
A: Closers mounted according to LCN installation instructions require no periodic maintenance or seasonal adjustments. Monthly, quarterly, and annual visual inspections are recommended for Fire/Life and Safety products as well as ADA Automatic Operators. Refer to the installation instructions for complete, product specific details.
For reference, our full line catalog as seen here:
Click Here
has a maintenance statement at the beginning of each closer section.
Q: What would cause a door closer to slam?
A: There are a few things that can cause a closer to slam.
The closer could be adjusted incorrectly. Turn all regulating screws clockwise until they stop. Then open each valve 1 and 1/2 turns. If the closer now seems to work, it can be adjusted to your closing preferences.
The closer may have lost some oil. If there is evidence that the closer has lost oil, nothing can be done to get it to work correctly. It will need to be replaced, or sent back to the factory for rebuild. Contact Sales Support for warranty/repair information.
There is internal damage or component failure. The closer will need to be replaced / repaired. Contact Sales Support for warranty/repair information.
Q: How do you adjust a door closer?
A: How to: What are the steps to adjust a door closer?
Facts: All LCN and FALCON door closers will have 3 regulating valves and a spring adjustment. All closers with a "Delay" feature will have an additional 4th valve. For specific instructions on your closer see Installation Instructions here.
Make adjustments below as required.
Back Check Valve, (valve #1 as specified in instructions) controls the back check intensity (3/32 allen wrench). Back check is used to slow the door down if someone throws the door open, or if the wind were to catch the door, and blow it open. Back check is used to slow the door down, not to stop the door. If you have a windy environment, or abusive people, (prisons, schools, colleges etc.) you may want to set the back check a little stiffer than you would on a retirement home, hospital doors, day care, etc. Turning the valve clockwise will give you a stiffer back check. Turning the valve counter clockwise will give you a lighter backcheck. If the door must be stopped at a certain position, then a Cush arm can be used, or for more abusive applications, an overhead stop can be used.
Main Speed Valve, (valve #2 as specified in instructions) controls the main closing speed of the door (3/32 allen wrench). The main speed is the area from the door in the wide open position down to the last 15°, or so, before the latch. Turning the valve clockwise will make the door close slower. Turning the valve counter clockwise will cause the door to close faster.
Latch Speed Valve, (valve #3 as specified in instructions) controls the latch speed of the door (3/32 allen wrench). The latch speed is the last 15°, or so, of closing. Turning the valve clockwise will cause the door to latch slower, and more gently. Turning the valve counter clockwise will cause the door to latch faster, and more abruptly.
Delayed Action Valve, controls delay time, on closers so equipped (3/32 allen wrench or flat blade screw driver - depending on closer series and age). For closers installed to 90° template-- when the door is opened past approximately 70°, the closer will delay closing until it comes back to around 70°. Turning the valve clockwise will cause the closer to delay longer (up to approximately 50 seconds). Turning the valve counterclockwise will cause the closer to delay for a shorter time (down to no delay). Please note that the position that the delay will kick in is dependent upon what degree of opening the closer is installed too. For example, closer installed to 180° template, delayed action will kick in only after the door is opened past approximately 95° and is available from approximately 120° to 90° position compared to if the closer was installed to 90° template then it would kick in when the is opened past approximately 70° and be available from 90° back down to approximately 70°. Also, the Closer Spring Force can affect how much delay time can be achieved. The weaker the closer spring force the more delay you can achieve, where as the stronger the closer spring force the less delay time you will have. Closers set to a 5 or 6 spring size will have minimal to no delay time because of the stronger closing force. NOTE: During Delayed Action cycle, the door does not stay in one set spot for the delay time, it will still be in motion during the delay zone based on the delay setting.
Spring Adjustment, is located on the end of the spring tube (5/32 allen wrench). It is used to adjust the spring strength (force to close the door). Clockwise gives the closer more closing power (which also makes the door harder to open), and turning the screw counter clockwise, will give the door less closing strength (and makes the door easier to open).
Q: What would cause my door closer to try and open the door instead of closing it?
A: Assuming this is a surface closer:
For a door closer that tries to open the door instead of closing it:
The closer body could be mounted backwards on the door - check instructions for proper closer orientation.
It could be the wrong hand closer (example -- a right hand closer mounted on a left hand door).
Make sure the proper mounting instructions were used (example -- a pull side closer mounted on the push side of the door, or vice verse).
For overhead concealed closers this is not uncommon as a result of hanging the door in the opening, while mating the arm to the spindle when the spindle is in the 0° position and the door is on the 90° position.
Q: What is TBSRT?
A: Thru-Bolt, Self Reaming & Tapping Screws: