Carbon Steel Gr5 Black Oxide Round Teeth Hexagon Hex Head Bolt

Name	Gr5 Black Round teeth hex bolt
Place of Origin	Jiaxing, Zhengjiang, China
Size	1/4-4" M5-M100, or non-standard as request&design
Finish	plain, zinc plated, black oxide, hot dip galv.et
Head Type	hex head
Material	Carbon steel, stainless steel, alloys steel etc.
Grade	a2,a4,4.8,8.8,10.9,12.9.etc,A2-70, A4-80, A193-B7, B16, L7 ect
Standard	GB, DIN, ISO, ANSI/ASTM, BS, BSW, JIS etc
Non-standards	OEM is available, according to drawing or samples
Samples	Samples are free.
Package	Bulk in master cartons, then on pallets, or according to customers' requirement.
Payment	T/T or L/C

Standard: DIN 933 / ISO 4017.
Thread: Metric coarse thread, with thread tolerance class generally at 6g, and fine threads are also available.
Head Shape: Hexagonal head, with Class A and Class B head dimensions. For bolts with a nominal diameter ≤ M24, Class A applies to lengths ≤ 10d or ≤ 150mm (whichever is smaller). Class B applies to bolts with a nominal diameter > M24 or lengths > 10d or > 150mm (whichever is smaller).
Thread Length: Fully threaded from the head to the end.
Material: Typically made of medium carbon steel or alloy steel. Common performance grades include 8.8, 10.9, and 12.9. Grade 8.8 bolts have a minimum tensile strength of 800 MPa and a proof load of 640 MPa. Grade 10.9 bolts have a minimum tensile strength of 1000 MPa and a proof load of 900 MPa. Grade 12.9 bolts have a minimum tensile strength of 1200 MPa and a proof load of 1100 MPa.
Surface Treatment: Black oxide, achieved through an alkaline oxidizing process followed by oil sealing. The coating thickness is less than 1 µm, offering mild corrosion resistance and rust protection when oiled. It also provides excellent dimensional stability and avoids dimensional changes.

Nominal Diameter: Ranges from M3 to M52.
Length: Available in various lengths to meet different usage requirements. For example, ASMC Industrial offers M12 x 1.75 x 160 mm fully threaded coarse thread DIN 933 Class 8.8 hex cap screws.
Head Dimensions: For instance, for a nominal diameter of M12, the circumscribed circle diameter of the hex head is 17.0 mm, and the head height is 7.0 mm.

High Strength: With various performance grades, they can meet the strength requirements of different applications. Grade 8.8 and above are high-strength bolts, suitable for mechanical equipment, construction engineering, and other fields requiring high strength.
Good Corrosion Resistance: The black oxide layer provides some protection against corrosion, and when combined with oil sealing, it can effectively prevent rusting in general environments.
Excellent Dimensional Stability: The black oxide treatment does not significantly change the bolt dimensions, making it ideal for precision assemblies.
Good Appearance: The uniform matte black appearance is visually appealing and is often used in decorative hardware for consumer products.

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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.