China Wholesale DIN 21346 Black Oxide Carbon Steel Square Head Bolt for Shaft Guides

• Customization: Available
• Material: Carbon Steel
• Type: Square Head
• Model NO.: DIN21346
• Connection: Common Bolt
• Head Style: Square
• Standard: DIN, ANSI, GB, JIS, BSW, GOST, ISO
• Grade: 8.8
• Application: Machinery, Chemical Industry, Environmental, Building
• Finish: Black
• Thread: Unc, Unf, Un, Metric Coarse, Fine
• Surface: Plain, Zinc Plated (Blue, White, Black, Yellow), N
• Quality: 100% Tested
• Price: Factory Price
• Lead Time: 15-30 Days
• Package: Standard Package or Customer's Packing
• Box: Customer's Brand Box/Plain Box
• MOQ: Can Be Negotiated
• Shipment: by Sea / Truck / Plane / Express
• Exterior Finish: Customized
• Sample: Available
• Customized: Available
• Service: One-Stop Service
• Online Sales: 24 Hours Online
• OEM/ODM: Available
• Transport Package: Bulk Packaging, Small Box(Glue Box, Color Box)
• Specification: M16-M30
• Trademark: Mianxuan, Customized
• Origin: Ningbo Zhejiang
• HS Code: 7318151001
• Production Capacity: 500tons/Month
• Package Size: 10.00cm * 10.00cm * 5.00cm
• Package Gross Weight: 0.400kg

Product Description

China Wholesale DIN 21346 Black Oxide Carbon Steel Square Head Bolt for Shaft Guides

DIN21346 Black Square Head Bolt
Material:	Carbon Steel, Stainless Steel, Brass etc.
Standards:	GB, DIN, ISO, ANSI/ASTM, BS, BSW, JIS, ETC
Size:	M16-M30 or non-standard asa request & design
Finish:	Plain, Black, Zinc, Yellow Zinc, HDG, Dacromet, etc.

 

Screw Thread d		M16	M20	M24	M30
P	Pitch	2	2.5	3	3.5
b	L≤200	36	43	53	-
	L>200	48	58	73	82
e		38.2	45.3	58	70.7
k		10	13	15	19
s		27	32	41	50

 

: DIN933, DIN931, DIN912, DIN603, DIN7985, DIN7991, DIN6921, ASME/ANSI B 18.2.1, ASME/ANSI B18.2.3.1 M, GB, BSW, ISO Hex bolt, carriage bolt, heavy hex bolt, flange head bolt, anchor bolt, etc

: DIN934, DIN6923, DIN985, ISO4032 hex heavy hex nut, 2H nut, A563 / A563M cap nut, nylon nut, etc

: threaded rod DIN975,DIN976, threaded bar DIN975 stud bolt, B7 stud bolt ect

: hex screw, DIN912; self-drilling screw, DIN7504; self-tapping screw, DIN7981/7982; drywall screw, pan head screw, button head screw, machine screw, chipboard screw, furniture screw, wood screw, etc

: flat washer DIN125, spring washer DIN127, lock washer, square washer, spring lock washer, plain washer, etc

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FAQ

Q1: What types of screws do you manufacture?

A1: We produce a full range of industrial screws including self-tapping screws, self-drilling screws, machine screws, wood screws, drywall screws, concrete screws, and customized non-standard screws.

Q2: What materials are available for your screws?

A2: Our screws are available in carbon steel (C1022, C1018), stainless steel (A2/304, A4/316), hardened steel, alloy steel, and brass.
Material selection depends on tensile strength and corrosion-resistance requirements.

Q3: Do you provide samples before mass production?

A3: Yes, we offer free or low-cost samples for quality and dimension confirmation prior to order.

Q4: How do you control product quality?

A4: Every batch is tested for torque, hardness, thread precision, and salt spray corrosion resistance, following ISO 9001 quality system standards.

Q5: Do you offer OEM or customized production?

A5: Yes. We can produce screws according to samples, technical drawings, or specific drive/head combinations, and offer custom packaging and labeling.

Q6: What is the tolerance and precision level of your threads?

A6: We use automated thread rolling with precision tooling.
Thread tolerance typically meets 6g / 6H and can be customized for special fitting requirements.

Q7: Will stainless steel bolts rust over time?

A7: Under severe chemical or chloride exposure, A2 may develop slight surface corrosion. A4/316 performs better in harsh environments. We also offer passivation treatment for enhanced protection.