Therma-Tru SHOP 3 Door Preparation - U1 Revised - Manual (Page 21)

Door
Preparation
Shop 3 2014 (U1 REVISED) 3.21
Lock Preparation
90 Minute Steel Fire Door
Mark for Lock Preparation
Preparation shown is for standard cylindrical lock sets.
For mortise locks and other types use manufacturer's
templates and instructions.
Backset
2.375” or 2.750”
Crossbore
Diameter
2.125”
CAUTION:
Due to stile width and lite placement, some
door styles have restrictions on lock crossbore
and backset. Using the DOOR STYLE
manual, (paperback or web site), see if
restrictions apply. Deadbolt locations
and sizes vary.
1.155”
6/8: 43.969”
7/0: 47.969”
Lock
Center
Top
Edge
4” or 5.50”
2.281”