HARDLOCK Nut ( THIN ) – Dimension and Torque

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Standard materials and coatings

Material Coating
Class 4/low-carbon steel (JIS SS400 equivalent) Electrogalvanized (trivalent chromate)
Hot-dip galvanized (HDZ35)
Class 8/medium-carbon steel (JIS S45C) Manganese Phosphate coating
A2/stainless steel (JIS SUS304 or equivalent) Unplated/plain

Please contact us for other materials and/or coatings.

Dimension table (M16–M130)

Updated September 29, 2016

Unit: mm

d Pitch Convex nut Concave nut Width across flats e Overall height Unit weight
P m m1 s ℓ g
Nominal size Coarse Fine Basic Tolerance Basic Tolerance Basic Tolerance Approx. Approx. Approx.
M16 2.0 1.5 10 0
-0.8		 10 0
-0.8		 24 0
-0.8		 27.7 16.3 36
M18 2.5 1.5 11 0
-0.9		 11 0
-0.9		 27 0
-0.8		 31.2 17.8 52
M20 2.5 1.5 12 0
-0.9		 12 0
-0.9		 30 0
-0.8		 34.6 19.3 67
M22 2.5 1.5 13 0
-0.9		 13 0
-0.9		 32 0
-1.0		 37.0 21.4 81
M24 3.0 2.0 14 0
-0.9		 14 0
-0.9		 36 0
-1.0		 41.6 22.9 116
M27 3.0 2.0 16 0
-1.4		 16 0
-1.4		 41 0
-1.0		 47.3 25.9 176
M30 3.5 2.0 18 0
-1.4		 18 0
-1.4		 46 0
-1.0		 53.1 29.9 260
M33 3.5 2.0 20 0
-1.5		 20 0
-1.5		 50 0
-1.0		 57.7 33.4 344
M36 4.0 3.0 21 0
-1.5		 21 0
-1.5		 55 0
-1.2		 63.5 33.9 424
M39 4.0 3.0 23 0
-1.5		 23 0
-1.5		 60 0
-1.2		 69.3 37.5 556
M42 4.5 4.0 25 0
-1.5		 25 0
-1.5		 65 0
-1.2		 75.0 41.0 730
M45 4.5 4.0 27 0
-1.5		 27 0
-1.5		 70 0
-1.2		 80.8 45.0 923
M48 5.0 4.0 29 0
-1.5		 29 0
-1.5		 75 0
-1.2		 86.5 49.0 1,169
M52 5.0 4.0 31 0
-1.5		 31 0
-1.5		 80 0
-1.2		 92.4 52.5 1,428
M56 5.5 4.0 34 0
-1.5		 34 0
-1.5		 85 0
-1.4		 98.1 57.5 1,687
M64 6.0 4.0 38 0
-1.5		 38 0
-1.5		 95 0
-1.4		 110 63.5 2,304
M68 40 0
-1.7		 40 0
-1.7		 100 0
-1.4		 115 66.6 3,030
M72 42 0
-1.7		 42 0
-1.7		 105 0
-1.4		 121 68.6 3,060
M76 46 0
-1.7		 46 0
-1.7		 110 0
-1.4		 127 76.6 3,740
M80 48 0
-1.7		 48 0
-1.7		 115 0
-1.4		 133 80.6 4,250
M85 50 0
-1.7		 50 0
-1.7		 120 0
-1.4		 139 82.6 4,610
M90 54 0
-2.0		 54 0
-2.0		 130 0
-1.6		 150 90.6 5,900
M95 57 0
-2.0		 57 0
-2.0		 135 0
-1.6		 156 95.6 6,770
M100 60 0
-2.0		 60 0
-2.0		 145 0
-1.6		 167 100.6 8,430
M105 63 0
-2.0		 63 0
-2.0		 150 0
-1.6		 173 105.6 9,250
M110 65 0
-2.0		 65 0
-2.0		 155 0
-1.6		 179 107.6 11,750
M115 69 0
-2.0		 69 0
-2.0		 165 0
-1.6		 191 115.6 12,280
M120 72 0
-2.0		 72 0
-2.0		 170 0
-1.6		 196 120.6 13,330
M125 76 0
-2.0		 76 0
-2.0		 180 0
-1.6		 208 128.6 16,290
M130 78 0
-2.0		 78 0
-2.0		 185 0
-1.6		 214 130.6 17,150

• Nut shape: JIS B1181 (2004)/ISO 4032
• Screw precision: JIS B0209 (2001)/ISO 261 – 6H
• Please inquire for dimensions, pitch and other specifications not mentioned above.
• Specifications, including size, are subject to change without notice.

Tightening torque table (M16–M130)

Updated September 29, 2016

Unit: mm

Nominal size Pitch Reference tightening torque for convex nut (same as general hex nut)
*70% of the bolt yield point		 Recommended tightening torque for the concave nut
Class 4 (SS400 or equivalent) Class 8 (S45C) A2/stainless steel
(JIS SUS304 or equivalent)		 Common to all materials
(min.–max.)
4.8
(320 N/mm²)		 8.8
(640 N/mm²)		 A2-50 A2-70
Trivalent chromate HDZ35 Manganese Phosphate coating Plain
M16 2.0 84 197 170 55 120 70–100
M18 2.5 115 270 230 76 165 100–150
M20 2.5 165 384 330 110 230 120–200
M22 2.5 225 523 450 145 315 150–250
M24 3.0 285 664 570 185 400 160–300
M27 3.0 415 972 835 275 585 250–390
M30 3.5 565 1,319 1,130 370 790 270–440
M33 3.5 770 1,795 1,540 505 1,080 290–490
M36 4.0 990 2,305 1,975 650 1,390 340–590
M39 4.0 1,280 2,985 2,555 840 1,800 390–640
M42 4.5 1,580 3,690 3,160 1,035 2,225 440–690
M45 4.5 1,980 4,620 3,960 1,300 2,785 490–740
M48 5.0 2,370 5,530 4,740 1,555 3,335 540–780
M52 5.0 3,075 7,175 6,150 2,020 4,325 590–830
M56 5.5 3,820 8,915 7,640 2,505 5,370 640–880
M64 6.0 5,765 13,445 11,525 3,780 8,105 690–930
M68 6,980 16,287 13,960 4,581 9,816 Tighten about 1 turn after tightening manually
M72 8,370 19,531 16,741 5,493 11,771
M76 9,931 23,172 19,862 6,517 13,965
M80 11,677 27,246 23,353 7,663 16,420
M85 14,131 32,973 28,263 9,274 19,872
M90 16,907 39,450 33,814 11,095 23,776
M95 20,023 46,721 40,047 13,140 28,158
M100 23,503 54,841 47,006 15,424 33,051
M105 27,363 63,847 54,726 17,957 38,479
M110 31,623 73,787 63,246 20,753 44,470
M115 36,302 84,705 72,605 23,823 51,050
M120 41,425 96,658 82,850 27,185 58,254
M125 47,006 109,682 94,013 30,848 66,103
M130 53,067 123,823 106,134 34,825 74,625

• The reference tightening torque for the convex nut is calculated on the basis of a torque coefficient of 0.15.
• The tightening torque for the convex nut with HDZ35 is calculated on the basis of a torque coefficient of 0.35.
• For the tightening torque of the A2/stainless steel convex nut, refer to the strength classification of the bolt used.
• The tightening torque for the convex nut is calculated as 60–80% of the basic type.
• Because the proof load of the convex nut is the same as a general single nut, there is no unique torque value.
• The concave nut can be tightened until contact with the convex nut even if the tightening torque exceeds the recommended maximum value because the torque coefficient varies depending on the surface roughness.
• For HDZ concave nuts, apply torque at the upper limit of the recommended torque range due to the high torque coefficient.