Standard Rim Type: Dimension and tightening torque tables

hln_standard-rim_img

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
Class 10/chromium molybdenum steel (JIS SCM435)
A2/stainless steel (JIS SUS304 or equivalent) Unplated/plain

・Please contact us for other coating options.

Dimension table (M5–M30)

Updated September 29, 2016

Unit: millimeters (mm)

d Pitch Convex nut Concave nut Width across flats Overall height Rim dia. Unit weight
P m m1 s g
Normal size Coarse Basic Tolerance Basic Tolerance Basic Tolerance Approx. Approx. Approx. Approx.
M5 0.8 4 +0.1
-0.15
4 +0.5
-0.2
8 0
-0.2
9.2 7.2 9.2 1.9
M6 1.0 5 ±0.3 5 0
-0.3
10 0
-0.6
11.5 8.5 11.5 4
M8 1.25 6.5 0
-0.58
6.5 0
-0.58
13 0
-0.7
15 10.8 15.0 8.9
M10 1.5 8 0
-0.58
8 0
-0.58
17 0
-0.7
19.6 13.2 19.6 18
M12 1.75 10 0
-0.58
9.3 0
-0.58
19 0
-0.8
21.9 16.0 21.9 26
M16 2.0 13 ±0.9 11 0
-0.7
24 0
-0.8
27.7 21.2 27.7 46
M20 2.5 16 ±0.9 14.5 0
-0.7
30 0
-0.8
34.6 26.7 34.6 93
M22 2.5 18 ±0.9 15.6 0
-1.2
32 0
-1.0
37 29.9 37.0 115
M24 3.0 19 ±0.9 17.6 0
-1.2
36 0
-1.0
41.6 32.4 41.6 183
M27 3.0 21 ±1.0 17.6 0
-1.2
41 0
-1.0
47.3 33.5 47.3 243
M30 3.5 23 ±1.0 18.6 0
-1.2
46 0
-1.0
53.1 36.5 53.1 312

• External dimensions according to JIS B1181 (2004)/ISO 4032 (width across flats only)
• Threads screw tolerance according to JIS B0209 (2001)/ISO 965 6H
• The overall height was changed to approximate the maximum height with considerable tolerance in January 2014.
• S45C is used in the class 10 concave nut with rim
• Class 4 with HDZ35, Class 8 and Class 10 are available in sizes larger than M8.
• The basic type is also available with fine threads.
• Sizes M20–M30 made of A2/stainless steel (SUS304 equiv.) are currently available only in the basic type as the rim is under development.
• Please be advised that specifications are subject to change without notice.

Tightening torque table (M16–M130)

Updated June 16, 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) Class 10 (SCM435) A2/stainless steel
(JIS SUS304 or equivalent)
Common to all (min.–max.)
4.8 (320 N/mm²) 8.8 (640 N/mm²) 10.9 (900 N/mm²) A2-50 A2-70
Trivalent chromate HDZ35 Manganese Phosphate coating Plain
M5 2.5 1.6 3.4 2–3
M6 4.1 2.7 5.7 4–5
M8 9.8 23 19.7 27.7 6.5 14 9–20
M10 20 45 39 55 13 27 18–27
M12 34 79 68 96 22 48 27–50
M16 84 197 170 237 55 120 70–120
M20 165 384 330 463 120–200
M22 225 523 450 630 150–250
M24 285 664 570 801 160–300
M27 415 972 835 1,171 250–390
M30 565 1,319 1,130 1,590 270–440

• 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.