HARDLOCK Rim Type Nut Standard

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HARDLOCK Rim Type Nut Standard

Bolt & Nut, Hard Lock Nut, Japan

Product: Made in Japan
Manufacturer: HARDLOCK
Basic Rim Type M5, M6, M8, M10, M12, M16, M20, M22, M24, M27, M30

HARDLOCK Nut provides unparalleled self locking performance even in the toughest environments and applications

When you need fail safe fastening performance in the most demanding vibration environment, trust HARDLOCK Nuts (HLN) to meet or exceed your expectations. Rim Type M5, M6, M8, M10, M12, M16, M20, M22, M24, M27, M30

Play will lead to not only shortened life span but also bolt brakeage which can result in catastrophic accidents.

We hit on the idea of utilizing the wedge principle, widely used in ancient Japanese architecture.

Thanks to the design inspired by the principle, HLN completely eliminates the play between the threads and withstands severe vibration longer than any other nuts in the world.
HLN consists of two nuts, the first nut 1 “Convex Nut” (clamping nut) has an eccentric protrusion on the upper surface.

The second nut 2 “Concave Nut” (locking nut) is designed with a concentric recess for locking the two nuts together.

By tightening the Concave Nut onto the Convex Nut, a strong perpendicular load will be applied to the bolt from both sides locking the HLN and making it resistant to vibrations and impacts from any direction.

After installing HLN you will realize a significant decrease in maintenance related work due to its exceptional self locking effect.

This will offer improvement of running cost, though HLN is a high end product, in combination with the advantage that it can be reused multiple times without almost any decrease in performance.

HLN differs from common self-locking nuts by being entirely metal-made and is available in a variety of materials and surface treatments to adapt to any environment.

HLN finds its primary use in high-safety applications within extreme conditions and environments, including sectors like railways, mining, civil engineering, and machinery, to name a few.

HARDLOCK NUT INSTALLATION

2. Use a tightening tool (spanner, torque wrench etc.) to tighten the Convex Nut to the appropriate torque for the applicationThe convex nut has the same strength class as a regular hexagon nut and can therefore be tightened to its maximum limit.

Manually install the Concave nut onto the Convex nut by hand until it stops turning, indicating the generation of prevailing torque, and ensure that a gap of more than 1 thread pitch exists between the nuts.

If the gap is less than 1 pitch, there may be a chance that sufficient locking effect will not be produced so please refrain from using HARDLOCK NUT with the bolt. (The same conditions apply for reuse.)

Use a torque wrench to tighten the Concave nut with the recommended torque set by HARDLOCK Industry Co., Ltd

Even after correctly tightening the Concave nut with the torque within the range of recommended tightening torque, there may remain a gap between the nuts due to the tolerance of bolt diameter.

Even under these conditions, the locking effect remains sufficient. However, you can further tighten the Concave nut to achieve one-sided or full contact, using more torque than recommended for enhanced locking. If managing the Concave nut’s tightening torque is challenging, use “one-sided contact” as a guideline to ensure locking power

When tightening the Concave nut on to the Convex nut, one side of the nuts will first come into contact, which gives an indication of sufficient locking effect (The Concave nut will slightly incline after the contact between the protrusion and the recess.)

When you achieve one-sided contact, the tightening torque increases rapidly.

By applying additional torque , the nuts will come into full contact . This state produces the ultimate locking effect of the HARDLOCK NUT, but further tightening may cause the breakage of bolt threads.

You should stop tightening the concave nut once it comes into full contact with the convex nut, even if the applied torque is less than the maximum recommended tightening torque.

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

Dimension table (M16–M130)

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

The external dimensions conform to JIS B1181 (2004)/ISO 4032 standards, specifically in width across flats. The thread screw tolerance adheres to JIS B0209 (2001)/ISO 965 6H specifications. The overall height was modified in January 2014 to approximate the maximum height, considering significant tolerance.

Tightening torque table (M16–M130)

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 once the convex and concave nuts reach full contact, even if it’s before the highest recommended torque

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.

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