Page 1695 - MiSUMi 2025

[Technical Calculation]
Dimension of Normal Parallel Key Type Excerpted from GB/T 1096—1979

Dimension of Normal Parallel Key Type (Excerpted from GB/T 1096—1979)

Type A Type B Type C
h c or r

R＝b/2 R＝b/2
b

L L L

Mark Example:
Round end normal parallel key (Shape A) b＝16mm, h＝10mm, L＝100mm Mark: Key 16×100 GB/T 1096—1979
Mark with the same dimension (Shape B), (Shape C): Key B16×100 GB/T 1096—1979, Mark: Key C16×100 GB/T 1096—1979
Table 1 Correspondence of b and h with Nominal Size and Limit Deviation
Nominal Dimension 2 3 4 5 6 8 10 12 14 16 18 20 22
b Limit Deviation 0 0 0 0 0
(h9) －0.025 －0.030 －0.036 －0.043 －0.052
Nominal Dimension 2 3 4 5 6 7 8 8 9 10 11 12 14
h Limit Deviation 0 ( 0 ) ➀ 0 ( 0 ) ➀ 0 0
(h11) －0.06 －0.025 －0.075 －0.030 －0.090 －0.110
c or r 0.16～0.25 0.25～0.40 0.40～0.60 0.60～0.80
Nominal Dimension 25 28 32 36 40 45 50 56 63 70 80 90 100
b Limit Deviation 0 0 0 0
(h9) －0.052 －0.062 －0.074 －0.087
Nominal Dimension 14 16 18 20 22 25 28 32 32 36 40 45 50
h Limit Deviation 0 0 0
(h11) －0.110 －0.130 －0.160
c or r 0.60～0.80 1.0～1.2 1.6～2.0 2.5～3.0
➀ The values in parentheses (corresponding to h9) apply to Shape B keys.
Table 2 Correspondence of L with Nominal Size and Limit Deviation
Nominal Dimension 6 8 10 12 14 16 18 20 22 25 28 32 36 40 45 50 56 63 70 80 90 100 110
L Limit Deviation 0 0 0 0 0 0
(h14) －0.36 －0.43 －0.52 －0.62 －0.74 －0.87
1. Parallel key, Keyway profile size should comply with regulations of GB/T 1095—2003 "Keyway profile sizes for parallel keys".
2. Technical conditions for normal parallel keys should comply with regulations of GB/T 1568—2008 "Technical specifications for keys".
3. When the key length is longer than 500mm, its length should be selected according to R20 series of GB/T 321—2005 "Preferred numbers -Series of preferred numbers".

B-050