China Suppliers Factory Galvanized DIN 6921 Hexagon Flange Bolts for Industrial and Structural Applications

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China Suppliers Factory Galvanized DIN 6921 Hexagon Flange Bolts for Industrial and Structural Applications

Hexagonal flange bolts are essential fasteners widely utilized in various industries for connecting components and structures that demand enhanced strength and stability. Common applications include mechanical equipment, vehicle parts, and building structures. Designed with a hexagonal head, these bolts facilitate easy tightening or loosening using a wrench, making them ideal for situations requiring frequent assembly and disassembly. As a leading product from China, our hexagonal flange bolts are manufactured by top suppliers in the industry, ensuring high-quality and reliable performance. These bolts are tailored for a diverse range of industrial applications and structural connection needs, providing a strong foundation for your projects. Trust our factory to deliver exceptional fasteners that meet your specifications.

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Product Description

Galvanized DIN 6921 flange hexagon bolts

📏 DIN 6921 Flange Hexagon Bolt — Dimensional Specifications

Thread specifications d			M5	M6	M8	M10	M12	M14	M16	M20
P	Pitch	Coarse teeth	0.8	1	1.25	1.5	1.75	2	2	2.5
		Fine Teeth 1	/	/	1	1.25	1.5	1.5	1.5	1.5
		Fine Teeth 2	/	/	/	1	1.25	/	/	/
b	L≤125		16	18	22	26	30	34	38	46
	125＜L≤200		/	/	28	32	36	40	44	52
	L＞200		/	/	/	/	/	/	57	65
c	Min		1	1.1	1.2	1.5	1.8	2.1	2.4	3
da	Type A	Max	5.7	6.8	9.2	11.2	13.7	15.7	17.7	22.4
da	Type B	Max	6.2	7.4	10	12.6	15.2	17.7	20.7	25.7
dc	Max		11.8	14.2	18	22.3	26.6	30.5	35	43
ds	Max		5	6	8	10	12	14	16	20
ds	Min		4.82	5.82	7.78	9.78	11.73	13.73	15.73	19.67
du	Max		5.5	6.6	9	11	13.5	15.5	17.5	22
dw	Min		9.8	12.2	15.8	19.6	23.8	27.6	31.9	39.9
e	Min		8.71	10.95	14.26	16.5	17.62	19.86	23.15	29.87
f	Max		1.4	2	2	2	3	3	3	4
k	Max		5.4	6.6	8.1	9.2	11.5	12.8	14.4	17.1
k1	Min		2	2.5	3.2	3.6	4.6	5.1	5.8	6.8
r1	Min		0.25	0.4	0.4	0.4	0.6	0.6	0.6	0.8
r2	Max		0.3	0.4	0.5	0.6	0.7	0.9	1	1.2
r3	Min		0.1	0.1	0.15	0.2	0.25	0.3	0.35	0.4
r4	≈		3	3.4	4.3	4.3	6.4	6.4	6.4	8.5
s	Max		8	10	13	15	16	18	21	27
s	Min		7.78	9.78	12.73	14.73	15.73	17.73	20.67	26.67
1. e Min. = 1.12 x S Min. 2. Material: a) Steel, strength class: 8.8, 10.9, 12.9 — DIN ISO 898-1 b) Stainless steel, strength class: A2-70 — DIN 267-11

⚙️ Key Functions of Flange Hexagonal Bolts

A flange hexagonal bolt is a specialized fastener used to connect critical components with high reliability. Its main functions include:

🔗 Stable Connection Provides a large tightening force to firmly connect flanges and components, ensuring long-term structural stability.

⚡ Power Transmission Transmits both fastening force and the mechanical power required by heavy-duty machinery and industrial equipment.

🛡️ Ensure Sealing Isolates connections from external media, ensuring the device remains airtight or watertight under pressure.

💪 Higher Preload Capacity Offers a superior support-area-to-stress ratio, allowing it to withstand higher preload forces and resist loosening.

❓ Frequently Asked Questions

Q What is a DIN 6921 flange hexagon bolt?

It is a standardized fastener with an integrated flange beneath the head that acts as a built-in washer, distributing load over a larger surface area for a more stable connection.

Q What materials are available for these bolts?

Available in steel (classes 8.8, 10.9, 12.9) and stainless steel (A2-70). Galvanized versions are also common for superior corrosion resistance.

Q What thread sizes does the DIN 6921 standard cover?

Metric sizes range from M5 to M20. Both coarse and fine thread pitches are supported depending on the specific application needs.

Q What are the advantages over standard hex bolts?

They eliminate the need for separate washers, reduce surface pressure, offer better anti-loosening properties, and handle higher preload forces effectively.

Q What is the difference between Type A and Type B?

The difference lies in the thread run-out diameter (da). Type B has a slightly larger maximum value than Type A, affecting the thread transition zone for different tolerance needs.

Q In which applications are they commonly used?

Widely used in automotive manufacturing, machinery assembly, structural steel, pipe flanges, and industrial equipment subject to vibration.

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China Suppliers Factory Galvanized DIN 6921 Hexagon Flange Bolts for Industrial and Structural Applications

Product Description

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Product Detail

China Suppliers Factory Galvanized DIN 6921 Hexagon Flange Bolts for Industrial and Structural Applications

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