Hexagon Head Bolt DIN 933

DIN 933 is a standard developed by the German Institute for Standardization that has gained international adoption.

The hexagon head bolt is used in the construction of buildings and structures, assembly of furniture and machinery: it is screwed into a slot or passed through holes. Washers and nuts are used to distribute load and secure the fastener.

The head of the fastener has a hexagonal shape, which allows it to withstand a large torque, so reliable tightening with a wrench is easy to achieve. Its height ranges from 2 to 40 mm, with a size of 5.5–95 mm. The standard length of the fastener can range from 5 mm to 20 cm. The bolt is a full-thread type, covered with thread entirely, except for the thread run-out area.

The thread diameter ranges from 1.6 to 52 (the letter M is placed before the number). Within the specified ranges there are sizes not recommended for production by the authors of the standard — for example, M3.5, M7, M14, M18. Bolts under this DIN fall into two product grades: A — for products up to M24 and no longer than 15 cm, B — for larger ones. The standard pitch under the DIN starts from 0.35 mm and increases by 0.05, 0.2, 0.25, 0.5 mm depending on the size of the product. Bolts are made of steel, including steel treated for corrosion protection — blackened, zinc-plated — as well as of non-ferrous metals. There are also similar products made of polymer materials.

Among the GOSTs, the closest equivalents of the German standard can be found under the numbers 7798-70, 7805-70. The first corresponds to product grade B, the second — A, however they feature partial thread.

FLOK supplies bolts manufactured in accordance with this standard. Order a batch by the piece or by weight (kg).

Dimensions and specifications table for DIN 933 full-thread bolts, in mm

D		M3	M4	M5	M6	M8	M10	M12	M14	M16	M18
P		0.5	0.7	0.8	1	1.25	1.5	1.75	2	2	2.5
K		2	2.8	3.5	4	5.3	6.4	7.5	8.8	10	11.5
C	min.	0.15	0.15	0.15	0.15	0.15	0.15	0.15	0.15	0.2	0.2
	max.	0.4	0.4	0.5	0.5	0.6	0.6	0.6	0.6	0.8	0.8
R		0.1	0.2	0.2	0.25	0.4	0.4	0.6	0.6	0.6	0.6
A		1.5	2.1	2.4	3	4	4.5	5.3	6	6	7.5
S	DIN 933	5.5	7	8	10	13	17	19	22	24	27
	ISO 4017						16	18	21
e	DIN 933	6.01	7.66	8.79	11.05	14.38	18.9	21.1	24.49	26.75	30.14
	ISO 4017						17.77	20.03	23.36

D		M20	M22	M24	M27	M30	M36	M42	M48	M56	M64
P		2.5	2.5	3	3	3.5	4	4.5	5	5.5	6
K		12.5	14	15	17	18.7	22.5	26	30	35	40
C	min.	0.2	0.2	0.2	0.2	0.2	0.2	0.3	0.3	0.3	0.3
	max.	0.8	0.8	0.8	0.8	0.8	0.8	1	1	1	1
R		0.8	0.8	0.8	1	1	1	1.2	1.6	2	2
A		7.5	7.5	9	9	10.5	12	13.5	15	16.5	18
S	DIN 933	30	32	36	41	46	55	65	75	85	95
	ISO 4017		34
e	DIN 933	33.53	38.85	39.98	45.2	50.85	60.79	71.3	82.6	93.56	104.9
	ISO 4017		37.72

Designations:

D - nominal thread diameter

P - thread pitch

K - bolt head height

C - washer face height

R - radius

A - thread run-out, max.

S - width across flats of the hexagon head

e - diameter across corners, min

L - bolt length