HARDLOCK Nut Standard Rim

Dimensions in millimeters (mm)

Nominal size Pitch Thickness Width across flats e Overall height Rim dia. Unit Weight Reference tightening torque for the convex nut (same as general hex nut) *70% of the bolt yield point Recommended tightening torque for the concave nut Common to all (Min – Max)
Convex nut Concave nut Class4 (SS400 or equivalent) Class8 (S45C) Class10 (SCM435) A2 (SUS304 or equivalent)
d P m m1 s l D g 4.8(320N/mm²) 8.8(640N/mm²) 10.9(900N/mm²) A2-50 A2-70
Basic Tolerance Basic Tolerance Basic Tolerance approx. approx. approx. approx. CR3 HDZ35 Manganese Phosphate coating Plain
M5 0.8 4 0.1 4 0.5 8 0 9.2 7.2 9.2 1.9 2.5 1.5 3.5 2 – 3
-0.15 -0.2 -0.2
M6 1 5 ±0.3 5 0 10 0 11.5 8.5 11.5 4 4 3 6 4 -5
-0.3 -0.6
M8 1.25 6.5 0 6.5 0 13 0 15 10.8 15 8.9 10 23 20 28 6.5 14 9 – 13
-0.58 -0.58 -0.7
M10 1.5 8 0 8 0 17 0 19.6 13.2 19.6 18 20 45 40 55 13 27 18 – 24
-0.58 -0.58 -0.7
M12 1.75 10 0 9.3 0 19 0 21.9 16 21.9 26 35 80 70 95 22 50 27 – 39
-0.58 -0.58 -0.8
M16 2 13 ±0.9 11 0 24 0 27.7 21.2 27.7 46 85 200 170 235 55 120 70 – 100
-0.7 -0.8
M20 2.5 16 ±0.9 14.5 0 30 0 34.6 26.7 34.6 93 165 385 330 465 120 – 200
-0.7 -0.8
M22 2.5 18 ±0.9 15.6 0 32 0 37 29.9 37 115 225 525 450 630 150 – 250
-1.2 -1
M24 3 19 ±0.9 17.6 0 36 0 41.6 32.4 41.6 183 285 665 570 800 160 – 300
-1.2 -1
M27 3 21 ±1.0 17.6 0 41 0 47.3 33.5 47.3 243 415 970 835 1,170 250 – 390
-1.2 -1
M30 3.5 23 ±1.0 18.6 0 46 0 53.1 36.5 53.1 312 565 1,320 1,130 1,590 270 – 440
-1.2 -1

– External dimensions : JIS B1181(2004) / ISO 4032 (Width across flats only)
– Threads screw tolerances : JIS B0209(2001) / ISO 965 6H
– The overall height has been changed to the approx. maximum height including considerable tolerances since Jan. 2014.
– S45C is used in the concave nut with rim of Class10.
– Class4 with HDZ35, Class8, Class10 are available in over M8.
– Fine threads are available in Basic type.
– M20 – M30 in A2(SUS304 equiv.) are avaialble in Basic type because their rim types are currently under development .
– Please be advised that the dimentions or specifications may be subject to change without notice.