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Double Lock Cylinder Size Chart (DOUBLE LOCK CHART)
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Double Lock Cylinder Size Chart (DOUBLE LOCK CHART)

A double lock cylinder is used when you want a keyed entry, and a key on the inside of the door as well. Most of our customers prefer a turnlatch on the inside of their entry door.

Uncertain of what size lock cylinder you need for your entry door? This table should help.

Please note lock cylinder and lock spindles are sold separately for L-9SP and its variations, such as L-9SP/SL and ZB-9SP . Select from the chart below, and place the cylinder in the mortise lock. All lock cylinders are 1.156" diameter.

Our lock cylinder part numbers are: L-9CC = 1"; L-9C4 = 1 1/4"; L-150S = 1 1/2"; L-175S = 1 3/4"

Click on the underlined links to go to this lock cylinder on the website.

Brass blocking rings are used with lock cylinders like L-9CC when the lock cylinder protrudes from the door (or door plate) of a thin door. Our chart refers to BR = Blocking Ring;  *  = One BR Needed;  +  = Two Blocking Rings Needed

R-G2 = 2mm thick  R-G3 = 3 mm thick  R-G4 =  4mm thick  R-G5 = 5mm thick  R-G6 = 6mm (1/4") thick

Reference sizes are:

0.125 = 1/8"

0.375=5/8"

0.625=11/16"

0.875=7/8"

0.937=15/16"

Abbreviation: Cyl.L. = Cylinder Length

DOUBLE CYLINDER TABLE OF CYLINDER LENGTHS

Door Thickness

1.375 or 13/8"(35mm)

1.75" or 1 ¾"(44mm)

2" (51mm)

2.25" (57mm)

2.5"

Lock+Trim Thickness

Cyl L.

B.R.

Cyl. L.

B.R.

Cyl. L.

B.R.

Cyl. L

B.R.

Cyl.L.

B.R.

A

.0625"

(2mm)

 1"

25mm

 +

.2812" 7mm

1"

25mm

 * .1875"

 5mm

 1"

25mm

 -

 1.125"

29mm

 -

1.25" 32mm

 -

B

.0937"

(2.3mm)

 1"

25mm

+ .25"

 6mm

 1"

25mm

 1.25"

32mm

1.125"

29mm

 +

.0625"

 2mm

 1.25"

 32mm

 +

.0625"

 2mm

1.375"

35mm

 +

.0625"

 2mm

C

.125"

(3mm)

 1"

25mm

 + .2187"

  6mm

 1"

25mm

 * .0625"

2mm

1.125"

29mm

 *

.0625"

2mm

1.25"

32mm

 *

.0625"

2mm

1.375"

35mm

 *

.0625"

 2mm

D

.1875"

(5mm)

 1"

25mm

 + .1562"

  4mm

 1"

25mm

 -

1.125"

29mm

 -

1.25"

32mm

 -

1.375"

35mm

 -

E

.25"

(6mm)

 1"

25mm

 * .1875"

 5mm

1.125"

29mm

 * .0625"

 2mm

1.25"

32mm

 *

.0625"

2mm

 1.375"

 35mm

 *

.0625"

2mm

 1.5"

38mm

 *

.0625"

2mm

F

.3125"

(8mm)

 1"

25mm

 * .0625"

2mm

1.125"

29mm

 -

1.25"

32mm

 -

 1.375"

35mm

 -

 1.5"

38mm

-

G

.375"

(10mm)

 1"

25mm

 -

1.25"

32mm

 * .0625"

2mm

1.375"

35mm

 *

.0625"

2mm

1.5"

38mm

 *

.0625"

2mm

1.625"

41mm

 *

.0625"

2mm

H

.687"

(17mm)

1.375"

35mm

 * .0625"

 2mm

1.625"

41mm

 + .0937

2.4mm

1.625"

41mm

 -

 1.75"

44mm

 -

 2"

51mm

 +

.0937"

2.4mm