For T locks shipping mid-June 2013, the new latch can be identified by viewing the deadlatch profile. The profile of the deadlatch has changed from a "full moon" to a "half-moon". See figure below....
The 33A/35A/98/9947 will work on doors with a maximum undercut of 1/4" and the 33A/35A/98/9948 will work with a undercut over 1/4" and up to 3/4".
The 47 top and bottom latches throw 5/8" and th...
The date of manufacture printed on the chassis cover (see below), will determine if you have a revised or old chassis. Chassis manufactured mid-June 2013 will have the new improvements. The first...