DIN 912 Refined Hexagonal Bolt Cup Head Half Round Head Flat Head

Short Description:

Grade: 4.8, 8.8, 10.9, 12.9, Material: Q235, 35K, 45K, 40Cr, 20Mn Tib, 35Crmo, 42Crmo, Surface Treatment: Blackened, Electrogalvanized, Dacromet, Hot-dip Galvanized, Galvanized, etc!

Internal hexagonal screws are commonly used in machinery, with the main advantages of being easy to tighten, disassemble, and less prone to slipping. Internal hexagonal wrenches are usually bent at a 90 ° angle, with one end long and the other short. When using the shorter end to tighten screws, holding the longer end can save a lot of force and better tighten the screws. The longer end has a round head (a hexagonal cylinder similar to a sphere) and a flat head, which can be easily inserted into the screw hole for easy disassembly. The manufacturing cost of the external hexagonal wrench is much lower than that of the internal hexagonal wrench. Its advantage is that the screw head (the position where the wrench is subjected to force) is thinner than the internal hexagonal wrench, and some places cannot be replaced by the internal hexagonal wrench. Machines with low cost, low power intensity, and low precision requirements use much fewer internal hexagonal screws than external hexagonal screws.

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Characteristic

Q235 wire is commonly used for hex screws, and of course, iron screw wire is also used. The wire used for these screws can determine some of the characteristics of hex screws.

The first one is that the hardness of stainless steel screws is relatively high, but if it is made of iron, the hardness is significantly worse, which is related to the wire of the iron itself. The texture of iron itself belongs to a relatively soft category, which cannot be compared to stainless steel wire. However, in order to achieve the required hardness for iron screws, heat treatment is generally used to harden them. During the heat treatment process, it is necessary to ensure that the screws are uniformly heated. Otherwise, not only will the hardness of the screws not meet the requirements, but it will also make them easy to bend, greatly increasing the production cost of hexagonal screws. After heat treatment, it is possible to increase the hardness of iron hexagonal screws, but due to wire issues, it is still not possible to compare the quality with stainless steel wire.

One thing to note for hex screws is to try not to let the screw head slip during use, otherwise it will be difficult to remove the screw in the future.

How to use bolts

1. After the installation of the internal hexagonal bolt, the tightening effect is very good due to the tightening of the thread, and there will be no loosening of the bolt, which can effectively avoid the loosening problem caused by long-term vibration and vibration of mechanical equipment. At the same time, hexagonal bolts can also be used with locking washers, locking agents, and other auxiliary measures to prevent loosening, resulting in higher reliability.

2. Easy to install
During the installation process of the internal hexagonal bolt, only the internal hexagonal wrench is needed for operation, which is simple and convenient, reducing manual operation time and cost. Compared with other bolts, hexagonal bolts are less prone to damage during installation, can be reused, and have a longer service life.

3. Wide applicability
The biggest advantage of hexagonal bolts is that they have a wide range of applications. It can be applied to various industries and fields, including the automotive industry, aerospace, mechanical manufacturing, construction engineering, etc. During the manufacturing, installation, and maintenance processes, hexagonal bolts have also demonstrated excellent performance and reliability.
In summary, as one of the commonly used fasteners in mechanical equipment, internal hexagonal bolts have the advantages of high strength, good anti loosening effect, easy installation, and wide applicability, making them a very reliable fastener.

Size

Parameters

Thread Size d			M1.4	M1.6	M2	M2.5	M3	M4	M5	M6	M8	M10	M12	(M14)	M16	(M18)	M20
P	Pitch	Coarse thread	0.3	0.35	0.4	0.45	0.5	0.7	0.8	1	1.25	1.5	1.75	2	2	2.5	2.5
		Fine thread pitch-1	–	–	–	–	–	–	–	–	1	1.25	1.25	1.5	1.5	1.5	1.5
		Fine thread pitch-2	–	–	–	–	–	–	–	–	–	1	1.5	–	–	2	2
d_k	plain head	max	2.6	3	3.8	4.5	5.5	7	8.5	10	13	16	18	21	24	27	30
	knurled heads	max	2.74	3.14	3.98	4.68	5.68	7.22	8.72	10.22	13.27	16.27	18.27	21.33	24.33	27.33	30.33
	min		2.46	2.86	3.62	4.32	5.32	6.78	8.28	9.78	12.73	15.73	17.73	20.67	23.67	26.67	29.67
d_a	max	1.8	2	2.6	3.1	3.6	4.7	5.7	6.8	9.2	11.2	13.7	15.7	17.7	20.2	22.4
d_s	max	1.4	1.6	2	2.5	3	4	5	6	8	10	12	14	16	18	20
d_s	min	1.26	1.46	1.86	2.36	2.86	3.82	4.82	5.82	7.78	9.78	11.73	13.73	15.73	17.73	19.67
e	min	1.5	1.73	1.73	2.3	2.87	3.44	4.58	5.72	6.86	9.15	11.43	13.72	16	16	19.44
k	max	1.4	1.6	2	2.5	3	4	5	6	8	10	12	14	16	18	20
k	min	1.26	1.46	1.86	2.36	2.86	3.82	4.82	5.7	7.64	9.64	11.57	13.57	15.57	17.57	19.48
s	Nominal Size	1.3	1.5	1.5	2	2.5	3	4	5	6	8	10	12	14	14	17
	min	1.32	1.52	1.52	2.02	2.52	3.02	4.02	5.02	6.02	8.025	10.025	12.032	14.032	14.032	17.05
	max	1.36	1.56	1.56	2.06	2.58	3.08	4.095	5.14	6.14	8.175	10.175	12.212	14.212	14.212	17.23
t	min	0.6	0.7	1	1.1	1.3	2	2.5	3	4	5	6	7	8	9	10
w	min	0.5	0.55	0.55	0.85	1.15	1.4	1.9	2.3	3	4	4.8	5.8	6.8	7.8	8.6
Weight of per 1000 steel products(kg)			–	–	–	–	–	–	–	–	–	–	–	–	–	–	–
Length of Thread b			–	–	–	–	–	–	–	–	–	–	–	–	–	–	–

Thread Size d			(M22)	M24	(M27)	M30	(M33)	M36	M42	M48	M56	M64	M72	M80	M90	M100
P	Pitch	Coarse thread	2.5	3	3	3.5	3.5	4	4.5	5	5.5	6	6	6	6	6
		Fine thread pitch-1	1.5	2	2	2	2	3	3	3	4	4	4	4	4	4
		Fine thread pitch-2	2	–	–	–	–	–	–	–	–	–	–	–	–	–
d_k	plain head	max	33	36	40	45	50	54	63	72	84	96	108	120	135	150
	knurled heads	max	33.39	36.39	40.39	45.39	50.39	54.46	63.46	72.46	84.54	96.54	108.54	120.54	135.63	150.63
	min		32.61	35.61	39.61	44.61	49.61	53.54	62.54	71.54	83.46	95.46	107.46	119.46	134.37	149.37
d_a	max		24.4	26.4	30.4	33.4	36.4	39.4	45.5	52.6	63	71	79	87	97	107
d_s	max		22	24	27	30	33	36	42	48	56	64	72	80	90	100
d_s	min		21.67	23.67	26.67	29.67	32.61	35.61	41.61	47.61	55.54	63.54	71.54	79.54	89.46	99.46
e	min		19.44	21.73	21.73	25.15	27.43	30.85	36.57	41.13	46.83	52.53	62.81	74.21	85.61	97.04
k	max		22	24	27	30	33	36	42	48	56	64	72	80	90	100
k	min		21.48	23.48	26.48	29.48	32.38	35.38	41.38	47.38	55.26	63.26	71.26	79.26	89.13	99.13
s	Nominal Size		17	19	19	22	24	27	32	36	41	46	55	65	75	85
	min		17.05	19.065	19.065	22.065	24.065	27.065	32.08	36.08	41.08	46.08	55.1	65.1	75.1	85.12
	max		17.23	19.275	19.275	22.275	24.275	27.275	32.33	36.33	41.33	46.33	55.4	65.4	75.4	85.47
t	min		11	12	13.5	15.5	18	19	24	28	34	38	43	48	54	60
w	min		9.4	10.4	11.9	13.1	13.5	15.3	16.3	17.5	19	22	25	27	32	34
Weight of per 1000 steel products(≈kg)			–	–	–	–	–	–	–	–	–	–	–	–	–	–
Length of Thread b			–	–	–	–	–	–	–	–	–	–	–	–	–	–