Din 936

DIN 936 hex nuts are jam nuts, it has a fine thread. This nut is produced by carbon steel. the hexagon jam nut is used in the fields of machine industrial, instrumentation and building.

DIN 936 Nuts Product Details

DIN 936 hexagon jam nut has two uses/functions, one is suitable for occasions where the installation environment is limited, and the other is used as an auxiliary nut on the double nut to prevent loosening.

In order to facilitate installation, the nut design will be thinner and can only be pasted in the space. This is the last resort. But there are no space restrictions in some places, but thin nuts are used in the design.

To know why the torque of a thin nut is not as good as a thick nut, but it is still designed and used, we need to know the change law of the pre-tightening force and the number of cycles of different thickness nuts.

DIN 936 Nuts size and weight table

Thread d		M8	M10	M12	M14	M16	M18	M20	M22	M24
		M8x1	M10x1	M12x1,25	M14x1,5	M16x1,5	M18x1,5	M20x1,5	M22x1,5	M24x1,5
		–	M10x1,25	M12x1,5	–	–	M18x2	M20x2	M22x2	M24x2
P		1,25	1	1,75	2	2	2,5	2,5	2,5	3
da	min.	8	10	12	14	16	18	20	22	24
da	max	8,75	10,8	13	15,1	17,3	19,5	21,6	23,7	25,9
dw	min.	11,3	15,3	17,2	20,2	22,2	25,3	28,2	29,5	33,2
e	min.	14,38	18,9	21,1	24,49	26,75	29,56	32,95	35,03	39,55
m	nominal=max.	5	6	7	8	8	9	9	10	10
m	min.	4,7	5,7	6,64	7,42	7,42	8,42	8,1	9,1	9,1
m´	min.	3,8	4,6	5,3	5,9	5,9	6,7	6,5	7,3	7,3
s	nominal=max.	13	17	19	22	24	27	30	32	36
s	min.	12,73	16,73	18,67	21,67	23,67	26,16	29,16	31	35
Weight (7,85 kg/dm3) kg/1000pcs		4	8,6	12,1	18,2	20,1	29,6	36,3	43,8	58


Thread d		M27	M30	M33	M36	M39	M42	(M45)	M48	M52
		M27x1,5	M30x1,5	M33x1,5	M36x1,5	M39x1,5	M42x1,5	M45x1,5	M48x1,5	M52x1,5
		M27x2	M30x2	M33x2	M36x2	M39x2	M42x2	M45x2	M48x2	M52x2
		–	–	–	M36x3	M39x3	M42x3	M45x3	M48x3	M52x3
P		3	3,5	3,5	4	4	4,5	4,5	5	5
da	min.	27	30	33	36	39	42	45	48	52
da	max	29,1	32,4	35,6	38,9	42,1	45,4	48,6	51,8	56,2
dw	min.	38	42,7	46,6	51,1	55,9	60,6	64,7	69,4	74,2
e	min.	45,2	50,85	55,37	60,79	66,44	71,3	76,95	82,6	88,25
m	nominal=max.	12	12	14	14	16	16	18	18	20
m	min.	10,9	10,9	12,9	12,9	14,9	14,9	16,9	16,9	18,7
m´	min.	8,7	8,7	10,3	10,3	11,9	11,9	13,5	13,5	15
s	nominal=max.	41	46	50	55	60	65	70	75	80
s	min.	40	45	49	53,8	58,8	63,1	68,1	73,1	78,1
Weight (7,85 kg/dm3) kg/1000pcs		90	110	155	190	260	307	400	460	580

Hexagon jam nuts installation

It is not used alone but used together with another standard nut, which has the advantage of not being lost. When the thickness of the two nuts is equal, there is a certain performance index. It can be seen from the above table that the thin nut needs to be placed in front, that is, the thin nut is screwed in first, and then the standard nut is screwed in. Only when the position is correct, the anti-loose effect will be better.

The installation operation process does not pay attention to this matter, and the front and rear positions are often misaligned. Therefore, many companies directly use two identical standard nuts for installation at the time of purchase. Although this will increase procurement costs, it can also effectively prevent improper installation.

The Most effective and convenient way to prevent loosening

Jam nuts plus standard nuts are the most effective and convenient way to prevent loosening today. We only need to pay attention to the rotation and tightening of the two nuts separately. Never screw in the second standard nut immediately after the first thin nut is loosened. In this way, the effect of preventing loosening cannot be achieved.

Under normal circumstances, as long as the first thin nut is tightened, and then the second standard nut is tightened, the locking will be affected. If you want to remove it, you need to use a wrench to get the last standard nut out, and then the thin nut will loosen.