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JIS B 1183:2010 Acorn Assembly Nut

JIS B 1183:2010 Acorn Assembly Nut is suitable for Japanese-standard connections requiring end protection and appearance coverage. The assembly-style design can improve installation efficiency in selected applications while the cap form conceals the thread end.

This product can be used on visible mechanical parts, vehicle accessories, furniture hardware, guardrails, and equipment panels. The capped structure reduces the risk of contact with exposed threads and helps prevent dust or debris from entering the thread end.

Materials and surface treatments can be selected according to matching thread, appearance requirements, and corrosion environment, making it suitable for Japanese-standard projects requiring consistency and finished quality.

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PREV：DIN 1587:2021 Acorn Heavy Nut NEXT：DIN 986:2013 Nonmetal Insert Acorn Nut

Dimensions unit: mm

Thread size  M4 M5 M6 M8 M10 M12 (M14) M16 (M18)
d
P Pitch Coarse teeth  0.7 0.8 1 1.25 1.5 1.75 2 2 2.5
Fine Teeth - - - 1 1.25 1.25 1.5 1.5 1.5
m2 Nominal 6.2 7.5 9.5 12.5 15.5 18.5 21 24 27
Max. 6.45 7.75 9.75 12.8 15.8 18.8 21.3 24.4 27.4
Min. 5.95 7.25 9.25 12.2 15.2 18.2 20.7 23.6 26.6
m Max. 3.2 4 5 6.5 8 10 11 13 15
Min. 2.9 3.7 4.7 6.14 7.64 9.64 10.57 12.57 14.57
s Max. 7 8 10 13 17 19 22 24 27
Min. 6.8 7.8 9.8 12.75 16.75 18.65 21.65 23.65 26.65
b Nominal 3.2 4 5 6.5 8 10 11 13 15
A Min. 5.6 6.6 8.5 11.5 14.5 16.5 19.5 21.5 23.5
t2 Min. 0.6 0.6 0.6 0.8 1 1.2 1.6 1.6 1.6
e ≈ 8.1 9.2 11.5 15 19.6 21.9 25.4 27.7 31.2
dw ≈ 6.8 7.8 9.8 12.5 16.5 18 21 23 26
R ≈ 3 3.5 4.5 6.5 7.5 8 10 11 12
r ≈ 0.5 0.5 0.5 0.5 0.5 1 1 1 1

Thread size  M20 (M22) M24 (M27) M30 (M33) M36 (M39)
d
P Pitch Coarse teeth  2.5 2.5 3 3 3.5 3.5 4 4
Fine Teeth 1.5 1.5 2 2 2 2 3 3
m2 Nominal 29 32.5 35.5 41 45 49 54.5 59
Max. 29.4 32.9 35.9 41.5 45.5 49.5 55 59.5
Min. 28.6 32.1 35.1 40.5 44.5 48.5 54 58.5
m Max. 16 18 19 22 24 26 29 31
Min. 15.57 17.57 18.48 21.48 23.48 25.48 28.48 30.38
s Max. 30 32 36 41 46 50 55 60
Min. 29.65 31.6 35.6 40.6 45.6 49.6 54.55 59.55
b Nominal 16 18 19 22 24 26 29 31
A Min. 26.5 28.5 32.5 37.5 41.5 45.5 50.5 55.5
t2 Min. 1.6 2 2 2 2 2 2 2
e ≈ 34.6 37 41.6 47.3 53.1 57.7 63.5 69.3
dw ≈ 29 31 34 39 44 48 53 57
R ≈ 13.5 14.5 16.5 19 21 23 25.5 28
r ≈ 1 1 1 1.5 1.5 1.5 1.5 1.5

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