d		M12	M16	M20	M22	M24	M27	M30
P		1.75	2	2.5	2.5	3	3	3.5
ds	Metric	13	17	21	23	25	28	31
	Max	12.85	16.85	20.84	22.84	24.84	27.84	30.83
	Min	12.74	16.74	20.71	22.71	24.71	27.71	30.67
b		18.5	22	26	28	29.5	32.5	35
e	Min	22.78	29.56	37.29	39.55	45.2	50.85	55.37
k		8	10	13	14	15	17	19
s		21	27	34	36	41	46	50
y	Max	6.5	7.5	8.5	8.5	10	10	11.5

Material: Made of carbon steel, which is relatively inexpensive and widely available. It offers good mechanical properties such as tensile strength and ductility. Common material grades include SAE 1006 to 1024 and AISI 1015 to 1045.
Performance Grade: Common grades include 4.8 and 8.8. For 4.8 grade bolts, the tensile strength is 400 MPa, and the yield strength is 320 MPa. For 8.8 grade bolts, the tensile strength is 800 MPa, and the yield strength is 640 MPa.
Head Style: Hexagonal head, featuring a regular hexagonal shape. This provides a larger contact surface with the workpiece, distributing pressure evenly to prevent damage. It also allows for easy engagement with wrenches and sockets for convenient installation and removal.
Surface Treatment: Common surface treatments include hot-dip galvanizing and black oxide finish. Hot-dip galvanizing involves immersing the bolt in molten zinc to form a protective layer, enhancing corrosion resistance and extending the bolt's service life. Black oxide finish involves a chemical reaction to form a layer of iron oxide on the bolt surface, offering moderate corrosion resistance and a clean appearance.
Dimensions and Standards: Dimensions comply with standards such as DIN933 and DIN931. Common metric thread sizes range from M5 to M24, with lengths varying by diameter and application requirements. For example, M8 bolts can range from 12 mm to 150 mm or longer.
Features: Carbon steel hex bolts offer high strength, good toughness, excellent corrosion resistance (depending on surface treatment), and compatibility with various nuts and threaded holes. They are cost-effective and widely used in machinery manufacturing, construction, automotive, and electronics industries.

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Jiaxing Goshen Hardware CO., LTD is Located at Economic Development Area, Jiaxing City, Zhejiang Province, China. We specialise in suppling kinds of stainless steel, high strength and low carbon steel fasteners with excellent quality and reliable price. Our fasteners according to a number of internationally recognised standards including DIN, ANSI/ASTM, BS, JIS, GB etc.