Yale 197

A: The lock shown is a much older version of the auxiliary rim latch lock (not an auxiliary rim dead bolt lock) . It looks like an old #80 Security latch lock. The specs for the current #80 are below. This is the only version we currently offer as the one shown is no longer available. Please review the specs and template to see if it looks like it will line up. Screw holes will not be the same.

Useful links:

Yale full Auxillary lock catalog and specifically page 17 here: Download File

Template here: Download File

Cut sheet here: Download File

Having said the above - YALE UK offers a number of "nightlatch" locks with 40mm (1.57") and 60mm backsets (2.36") but I do not see anything in their current product range in a 50mm (2 inch) backset.

See this link:

Click Here

However, it appears other European manufacturers do indeed make nightlatch locks with a 50mm backset. You may want to do a google search for 50mm backset nightlatch and see what you find. Unfortuatnely, looks like you may need to import something from Europe if you need to keep that 2" backset.

Here's an example of a 50mm solution:

Click Here

A: The difference between the 197 & 197-1/4 is that the 197 is a single-cylinder deadlock and the 197-1/4 is a double cylinder deadlock as seen on pages 21 and 22 of the manufacturer's product catalog as seen here:

Download File

Stated plainly the 197 has a thumbturn on the inside.