Basic Normal Type: Dimension and tightening torque tables

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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 coating options.

Dimensions in milimeters

Updated October 20, 2016

Unit: mm

d Pitch Convex nut Concave nut Width across flats Overall height Unit Weight
P m m1 s g
Nominal Size Coarse Fine Basic Tolerance Basic Tolerance Basic Tolerance Approx. Approx. Approx.
M6 1.0 0.75 5 ±0.48 5 ±0.48 10 0
-0.6
11.5 9.2 3.3
M8 1.25 1.0 6.5 ±0.58 6.5 ±0.58 13 0
-0.7
15 12 8.6
M10 1.5 1.25 8 ±0.58 8 ±0.58 17 0
-0.7
19.6 14.4 17.6
M12 1.75 1.25 10 ±0.58 10 ±0.58 19 0
-0.8
21.9 17.9 27.3
M14 2.0 1.5 11 ±0.7 11 ±0.7 22 0
-0.8
25.4 19.9 39
M16 2.0 1.5 13 ±0.9 12 ±1.0 24 0
-0.8
27.7 23.2 52.8
M18 2.5 1.5 15 ±0.9 14 ±1.0 27 0
-0.8
31.2 26.7 80
M20 2.5 1.5 16 ±0.9 15 ±1.0 30 0
-0.8
34.6 28.2 105
M22 2.5 1.5 18 ±0.9 17 ±1.0 32 0
-1.0
37.0 32.3 130
M24 3.0 2.0 19 ±0.9 18 ±1.0 36 0
-1.0
41.6 33.9 180
M27 3.0 2.0 21 ±1.0 21 ±1.0 41 0
-1.0
47.3 37.9 246
M30 3.5 2.0 23 ±1.0 23 ±1.0 46 0
-1.0
53.1 41.9 375
M33 3.5 2.0 25 ±1.0 20 0
-1.5
50 0
-1.0
57.7 39.4 411
M36 4.0 3.0 28 ±1.0 21 0
-1.5
55 0
-1.2
63.5 41.9 532
M39 4.0 3.0 30 ±1.2 23 0
-1.5
60 0
-1.2
69.3 45.7 681
M42 4.5 4.0 33 ±1.2 25 0
-1.5
65 0
-1.2
75.0 50.2 892
M45 4.5 4.0 35 ±1.2 27 0
-1.5
70 0
-1.2
80.8 54.2 1,115
M48 5.0 4.0 37 ±1.2 29 0
-1.5
75 0
-1.2
86.5 58.2 1,393
M52 5.0 4.0 41 ±1.2 31 0
-1.5
80 0
-1.2
92.4 63.7 1,708
M56 5.5 4.0 44 ±1.2 34 0
-1.5
85 0
-1.4
98.1 68.7 2,047
M64 6.0 4.0 50 ±1.5 38 0
-1.5
95 0
-1.4
110 77 2,795
M68 53 ±1.5 40 0
-1.7
100 0
-1.4
115 81.1 3,480
M72 57 ±1.5 42 0
-1.7
105 0
-1.4
121 85.1 3,910
M76 60 ±1.5 46 0
-1.7
110 0
-1.4
127 92.1 4,440
M80 63 ±1.5 48 0
-1.7
115 0
-1.4
133 97.1 5,070
M85 67 ±1.5 50 0
-1.7
120 0
-1.4
139 101.1 5,630
M90 71 ±1.5 54 0
-2.0
130 0
-1.6
150 109.1 7,340
M95 75 ±1.5 57 0
-2.0
135 0
-1.6
156 115.1 8,150
M100 79 ±1.5 60 0
-2.0
145 0
-1.6
167 121.1 10,140
M105 83 ±1.8 63 0
-2.0
150 0
-1.6
173 127.4 11,140
M110 87 ±1.8 65 0
-2.0
155 0
-1.6
179 131.4 12,000
M115 91 ±1.8 69 0
-2.0
165 0
-1.6
191 139.4 14,780
M120 95 ±1.8 72 0
-2.0
170 0
-1.6
196 145.4 16,050
M125 99 ±1.8 76 0
-2.0
180 0
-1.6
208 153.4 19,410
M130 103 ±1.8 78 0
-2.0
185 0
-1.6
214 157.4 20,650

• External dimensions according to JIS B1181 (2004)/ISO 4032 (width across flats only)
• Threads screw tolerance according to JIS B0209 (2001)/ISO 965 6H
• Specifications, including size, are subject to change without notice.

 

Tightening Torque Table Dimensions

Updated June 16, 2017

Unit: newton meters (N·m)

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)
Class 10
(SCM435)
A2/stainless steel
(JIS SUS304 or equivalent)
Common to all materials (Min – Max)
4.8
(320 N/mm²)
8.8
(640 N/mm²)
10.9
(900 N/mm²)
A2-50 A2-70
CR3 HDZ35 Manganese Phosphate coating Plain
M8 1.25 9–13
M10 1.5 18–24
M12 1.75 27–39
M14 2.0 55 125 110 150 36 75 55–70
M16 2.0 70–100
M18 2.5 115 270 230 330 75 165 100–150
M20 2.5 110 230 120–240
M22 2.5 145 315 150–250
M24 3.0 185 400 160–380
M27 3.0 275 585 250–390
M30 3.5 370 790 270–440
M33 3.5 770 1,795 1,540 2,165 505 1,080 290–490
M36 4.0 990 2,305 1,975 2,780 650 1,390 340–590
M39 4.0 1,280 2,985 2,555 3,600 840 1,800 390–640
M42 4.5 1,580 3,690 3,160 4,445 1,035 2,225 440–690
M45 4.5 1,980 4,620 3,960 5,570 1,300 2,785 490–740
M48 5.0 2,370 5,530 4,740 6,670 1,555 3,335 540–780
M52 5.0 3,075 7,175 6,150 8,650 2,020 4,325 590–830
M56 5.5 3,820 8,915 7,640 10,745 2,505 5,370 640–880
M64 6.0 5,765 13,445 11,525 16,210 3,780 8,105 690–930
M68 6,980 16,287 13,960 19,630 4,581 9,816 Tighten about 1 turn after tightening manually
M72 8,370 19,531 16,741 23,540 5,493 11,771
M76 9,931 23,172 19,862 27,930 6,517 13,965
M80 11,677 27,246 23,353 32,840 7,663 16,420
M85 14,131 32,973 28,263 39,745 9,274 19,872
M90 16,907 39,450 33,814 47,550 11,095 23,776
M95 20,023 46,721 40,047 56,315 13,140 28,158
M100 23,503 54,841 47,006 66,100 15,424 33,051
M105 27,363 63,847 54,726 76,960 17,957 38,479
M110 31,623 73,787 63,246 88,940 20,753 44,470
M115 36,302 84,705 72,605 102,100 23,823 51,050
M120 41,425 96,658 82,850 116,505 27,185 57,254
M125 47,006 109,682 94,013 132,205 30,848 66,103
M130 53,067 123,823 106,134 149,250 34,825 74,625


• Stop tightening if full contact is reached between the convex and concave nuts before reaching the highest recommend torque.
• 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.
• 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, tighten 50% more than the recommended torque value due to the high torque coefficient.

 

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 equivalent) Unplated/plain

Please contact us for other coating options.

Dimension table

Updated February 13, 2017

Unit: millimeters (mm)

Nominal size Convex nut Concave nut Width across flats e Overall height Unit Weight
d Threads per inch m m1 s g
Basic Tolerance Basic Tolerance Basic Tolerance Approx. Approx. Approx.
w3/8 16 8 ±0.8 8 ±0.8 17 0
-0.7
19.6 14.8 17
w1/2 12 10 ±0.8 10 ±0.8 21 0
-0.8
24.2 18.3 31
w5/8 11 13 ±0.9 13 ±0.9 26 0
-0.8
30 24.1 66
w3/4 10 16 +0.9
-1.4
16 +0.9
-1.4
32 0
-0.8
37 29.1 121
w7/8 9 18 +0.9
-1.4
18 +0.9
-1.4
35 0
-1.0
40.4 33.2 160
w1 8 20 +1.0
-1.5
20 +1.0
-1.5
41 0
-1.0
47.3 35.9 239

• The JIS Standard Whitworth Threads were abolished in 1968. The above table is JISB1180/7H (1965).
• Please contact us for information regarding other sizes.
• Please be advised that specifications are subject to change without notice.

 

Tightening Torque Table

Updated February 13, 2017

Unit: newton meters (N·m)

Nominal size 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
Class 4 (SS400 or equivalent) Class 8 (S45C) A2/stainless steel
(JIS SUS304 or equivalent)
Common to all (Min – Max)
4.8 (320 N/mm²) 8.8 (640 N/mm²) A2-50 A2-70
CR3 HDZ35 Manganese Phosphate coating Plain
w3/8 16 37 31 10 22 18–24
w1/2 37 87 75 25 52 27–39
w5/8 77 180 155 50 110 70–100
w3/4 135 320 275 90 190 120–200
w7/8 220 515 440 145 310 160–300
w1 330 770 660 215 465 270–440

• 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.
• 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, tighten 50% more than the recommended torque value due to the high torque coefficient.

 

Standard Materials and Coatings

Strength/Material Coating
ASTM A194 Grade 2H (Medium Carbon Steel) Manganese Phosphate coating

Contact us for other materials and coatings.

Dimension Table

Updated: Apr 1, 2018

Unit: inch

Norminal Size-Threads per inch Convex nut Concave nut Width across flats Overall height Unit Weight
m m1 s g
Max. Min. Max. Min. Max. Min. approx. approx. approx.
1/4-20 UNC 0.226 0.212 0.226 0.212 0.438 0.428 0.488 0.390 3.3
5/16-18 UNC 0.273 0.258 0.273 0.258 0.500 0.489 0.557 0.457 7.9
3/8-16 UNC 0.337 0.320 0.337 0.320 0.562 0.551 0.628 0.559 17.6
7/16-14 UNC 0.385 0.365 0.385 0.365 0.688 0.675 0.768 0.638 20.8
1/2-13 UNC 0.448 0.427 0.448 0.427 0.750 0.736 0.840 0.752 28.1
5/8-11UNC 0.559 0.515 0.559 0.515 0.938 0.922 1.051 0.972 53
3/4-10 UNC 0.665 0.597 0.665 0.597 1.125 1.088 1.240 1.165 105
7/8-9 UNC 0.776 0.704 0.776 0.704 1.312 1.269 1.447 1.370 130
1-8 UNC 0.887 0.811 0.887 0.811 1.500 1.450 1.653 1.567 246
1 1/8-7 UNC 0.999 0.919 0.999 0.919 1.688 1.631 1.859 1.776 310
1 1/4-7 UNC 1.094 1.010 0.751 0.667 1.875 1.812 2.066 1.583 324
1 3/8-6 UNC 1.206 1.118 0.815 0.727 2.062 1.994 2.273 1.728 436
1 1/2-6 UNC 1.317 1.225 0.880 0.788 2.250 2.175 2.480 1.843 551
1 3/4-5 UNC 1.540 1.440 1.009 0.909 2.625 2.538 2.893 2.189 896
2-4.5 UNC 1.763 1.655 1.138 1.030 3.000 2.900 3.306 2.433 1,363

• Dimensions…ASME/ANSI B18.2.2 1987(R1999)
• Thread Requirements…ANSI B1.1a-1968 2B
• The dimensions or specifications are subject to change without notice.

 

Tightening Torque Table

Updated: July 9, 2018

Unit: newton meters (N·m)

Nominal size 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
Class 4
Low Carbon
ASTM A194 Grade 2H(Medium Carbon Steel) A2/stainless steel
(JIS SUS304 or equivalent)
Common to all (min.–max.)
4.8 (320 N/mm²) A193 Grade B7 (724N/mm²) A2-50 A2-70
CR3 Manganese Phosphate coating Plain
1/4-20 UNC 8.8 4 – 5
5/16-18 UNC 18 9 – 13
3/8-16 UNC 32 18 – 24
7/16-14 UNC 51 27 – 39
1/2-13 UNC 78 40 – 58
5/8-11UNC 156 70 – 100
3/4-10 UNC 276 120 – 200
7/8-9 UNC 445 150 – 250
1-8 UNC 667 200 – 350
1 1/8-7 UNC 978 260 – 420
1 1/4-7 UNC 1,376 280 – 470
1 3/8-6 UNC 1,867 320 – 550
1 1/2-6 UNC 2,465 370 – 620
1 3/4-5 UNC 4,008 470 – 720
2-4.5 UNC 6,100 570 – 800

• Stop tightening if full contact is reached between the convex and concave nuts before reaching the highest recommend torque.

• The reference tightening torque for the convex nut is calculated on the basis of a torque coefficient of 0.15.
• For the tightening torque of the A2/stainless steel convex nut, refer to the strength classification of the bolt used.
• No tightening torque is specified for the convex nut, which shall be tightened to the appropriate torque for the application.
(The convex nut has the same strength class as regular hexagon nut and can be tightened to its maximum limit.)
• The concave nut can be tightened to come into contact either one-sided or fully even with more torque than the recommended torque to better ensure locking effect.