
Trim Parts
40H Series Service Manual 5–21
Cylinders by door
thickness
The table below lists cylinders by door thicknesses. If a door’s thickness
falls between two thicknesses listed below, round up. For doors where
the mortise case is not centered in the door, contact your local BEST
Representative.
Cylinder ring
lengths
Door thickness
Sectional, J, and
M cylinder Hotel cylinder N cylinder
2″ B35170 B35200 1E7N4
2 1/4″ B35171 B35201 B35284
2 1/2″ B35172 B35202 B35285
2 3/4″ B35173 B35203 B35286
3″ B35174 B35204 B35287
3 1/4″ B35175 B35205 B35288
3 1/2″ B35176 B35206 B35289
3 3/4″ B35177 B35207 B35290
4″ B35178 B35208 B35291
4 1/4″ B35179 B35209 B35292
4 1/2″ B35180 B35210 B35293
4 3/4″ B35181 B35211 B35294
5″ B35182 B35212 B35295
Ring part no. Length (decimal)
B35100 7/32″ (.219)
B35101 11/32″ (.344)
B35102 13/32″ (.406)
B35103 7/16″ (.438)
B35104 9/16″ (.562)
B35105 19/32″ (.594)
B35106 21/32″ (.656)
B35107 23/32″ (.719)
B35108 13/16″ (.812)
B35109 5/16″ (.312)
Figure 5.24 Cylinders
Standard cylinder Hotel cylinder N trim cylinder
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