Rail Diameter Code Shaft
A
Root Diameter Tube I.D. Bushing Length
B
Bushing Length
C
Thread
M
Thread Length
N
Equivalent
Diameter**
CAD Model
in ± .002
(mm ± 0.05)
in ± .002
(mm ± 0.05)
in ± .002
(mm ± 0.05)
in ± .001
(mm ± 0.025)
in ± .01
(mm ± 0.25)
  in ± .002
(mm ± 0.05)
inch
(mm)

SS/SZ 02 .125 (3.18) .095 (2.41) NA 0.375 (9.53) 0.500 (12.70) 3/8-24 0.250 (6.25) 0.250 (6.35) Download
04 0.250 (6.35) .202 (5.13) NA 0.500 (12.70) 0.75 (19.1) 7/16-20 0.250 (6.35) 0.250 (6.35) Download
06 0.375 (9.53) .306 (7.77) NA 0.625 (15.88) 1.00 (25.4) 9/16-20 0.375 (9.53) 0.375 (9.53) Download
08 0.500 (12.70) .419 (10.64) NA 0.813 (20.65) 1.50 (38.1) 3/4-20 0.500 (12.70) 0.500 (12.70) Download
12 0.750 (19.05) .630 (16.00) NA 1.125 (28.58) 2.25 (57.2) 1-16 0.750 (19.05) 0.750 (19.05) Download