DIN 971 Hexagon Nut with Metric Fine Thread

Standard DIN 971 covers hexagon nuts with metric fine thread. The thread can be left-hand or right-hand depending on the product’s application. The increased number of thread turns provides greater joint strength and improves resistance to self-loosening compared to standard thread pitch.

This gives the fastener wide application in mechanical engineering and other industrial sectors. The product is used together with bolts, screws and other types of fasteners.

Materials

Carbon steel with property class 8 is used for fine-thread nuts; the material is designed for intensive mechanical loads. Steel nuts can be supplied with a zinc coating for enhanced resistance to corrosive environments. Nuts made of stainless steels A2 and A4 are also available — they are protected from corrosion and can be used for a long time in aggressive environments.

Technical specifications of the product:

• The thread diameter of the bore can range from M1 to M52.
• The width across flats of the nut ranges from 2.5 to 80 mm.
• The overall height varies from 0.8 to 42 mm.

Similar fastener products are manufactured in accordance with the international standards ISO 8673 and ISO 8674.

Applications

Nuts with metric fine thread provide secure fastening of parts together with other types of threaded fasteners. They are used in machine tool building, instrument making, automotive manufacturing and other industrial sectors, and are suitable for assembling various mechanisms, units and assemblies. FLOK supplies fasteners in accordance with the standard.

d	m DIN/ISO	s DIN/ISO
M1	0.8	2.5
M1.2	1	3
M1.4	1.2	3
M1.6	1.3	3.2
M2	1.6	4
M2.5	2	5
M3	2.4	5.5
M3.5	2.8	6
M4	3.2	7
M5	4/4.7	8
M6	5/5.2	10
M7	5.5	11
M8	6.5/6.8	13
M10	8/8.4	17/16
M12	10/10.8	19/18
M14	11/12.8	22/21
M16	13/14.8	24
M18	15/15.8	27
M20	16/18	30
M22	18/19.4	32/34
M24	19/21.5	36
M27	22/23.8	41
M30	24/25.6	46
M33	26/28.7	50
M36	29/31	55
M39	31/33.4	60
M42	34	65
M45	36	70
M48	38	75
M50	38	75
M52	42	80
M56	45	85
M60	48	90
M64	51	95
M68	54	100
M72	58	105
M76	61	110
M80	64	115
M85	68	120
M90	72	130
M100	80	145
M110	88	155

Designations:

d - nominal thread diameter

m - nut height

s - width across flats