HARDLOCK Nut (Rim Type) – Dimensions and Torque

hln_standard-rim_img

Common Questions

Standard materials and coatings

Material	Coating
Class 4/low-carbon steel (JIS SS400 equivalent)	Electrogalvanized (trivalent chromate)
Class 4/low-carbon steel (JIS SS400 equivalent)	Hot-dip galvanized (HDZ35)
Class 8/medium-carbon steel (JIS S45C)	Manganese Phosphate coating
Class 10/chromium molybdenum steel (JIS SCM435)	Manganese Phosphate coating
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		ｅ	Overall height	Rim dia.	Unit weight
d	P	m		ｍ1		s		ｅ	ℓ	Ｄ	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 Sep 1, 2020

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	9–13
M10	20	45	39	55	13	27	18–24
M12	34	79	68	96	22	48	27–39
M16	84	197	170	237	55	120	70–100
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.