Wholesale DIN 603:2017 Large Round Head Square Neck Bolt

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DIN 603:2017 Large Round Head Square Neck Bolt

DIN 603:2017 Large Round Head Square Neck Bolt has a large round bearing head and a square neck that prevents rotation. It is suitable for exposed joints where a smooth appearance and self-locating installation are desired.

Typical applications include wood structures, fences, shelving, vehicle accessories, agricultural machinery, and light steel-wood assemblies. The large round head provides better coverage, while the square neck seats into the prepared hole to resist turning.

During installation, the square neck should be matched with a square hole or suitable base material for reliable seating. For outdoor and wood-structure uses, corrosion protection, head appearance, and matching thread hardware strongly affect service life.

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Dimensions unit: mm

Thread size d M5 M6 M8 M10 M12 M16 M20
P Pitch 0.8 1 1.25 1.5 1.75 2 2.5
b L≤125 16 18 22 26 30 38 46
125<L≤200 22 24 28 32 36 44 52
L>200 / / 41 45 49 57 65
dk Max. 13.55 16.55 20.65 24.65 30.65 38.8 46.8
Min. 12.45 15.45 19.35 23.35 29.35 37.2 45.2
ds Max. 5 6 8 10 12 16 20
Min. 4.52 5.52 7.42 9.42 11.3 15.3 19.16
k1 Max. 4.1 4.6 5.6 6.6 8.75 12.9 15.9
Min. 2.9 3.4 4.4 5.4 7.25 11.1 14.1
k Max. 3.3 3.88 4.88 5.38 6.95 8.95 11.05
Min. 2.7 3.12 4.12 4.62 6.05 8.05 9.95
r1 ≈ 10.7 12.6 16 19.2 24.1 29.3 33.9
r2 Max. 0.5 0.5 0.5 0.5 1 1 1
r3 Max. 0.75 0.9 1.2 1.5 1.8 2.4 3
s Max. 5.48 6.48 8.58 10.58 12.7 16.7 20.84
Min. 4.52 5.52 7.42 9.42 11.3 15.3 19.16
 Thousand pieces of steel weigh ≈kg  - - - - - - -
Thread length b  - - - - - - -

① Material:

a) Steel, strength grade: 4.6, 4.8, 8.8 according to DIN EN ISO 898-1

b) Stainless steel, strength grade: A2-70, A4-70 according to DIN EN ISO 3506-1

FAQ

Frequently Asked Questions

  • 1. How soon can I expect a reply after sending an inquiry?

    A: We take every inquiry seriously. On working days, we will respond within 12 hours after receiving your inquiry.

  • 2. What products do you mainly offer?

    A: We focus on the production of fasteners made of carbon steel, stainless steel, and low-alloy steel. We are a direct manufacturer with independent production capacity. DIN 603:2017 Large Round Head Square Neck Bolt Factory. We own several fastener manufacturing facilities and have an international sales department, providing full-process services from production to export.

  • 3. Do you support customized production?

    A: Customized production is our core business. We can develop and manufacture products based on the drawings or samples you provide.

  • 4. Do you produce standard parts?

    A: Yes. In addition to custom products, we also produce general construction machinery parts (GET parts) for equipment such as excavators, including bucket teeth, tooth holders, corner blades, pins, clips, bolts and nuts. DIN 603:2017 Large Round Head Square Neck Bolt Wholesale.

  • 5. What is your production capacity?

    A: We have 12 energy-efficient and environmentally friendly modern production lines (including one fully automatic shell molding line and four heat treatment lines), with an annual production capacity exceeding 20,000 tons, enabling us to steadily meet various order requirements.

  • 6. What are your payment terms?

    A: Trade terms (such as FOB, CIF, etc.) are confirmed when quoting. For batch production, we typically require a 30% deposit, with the balance paid against the copy of the bill of lading. T/T is the main payment method accepted, and L/C can also be negotiated.

  • 7. How is the shipment arranged?

    A: We are only 35 km away from Shanghai Port and Ningbo Port, so sea freight is the main mode of transportation, which is convenient and efficient. For urgent deliveries, we can also arrange air freight via Ningbo or Shanghai airports.

Better Fastener Industry Co., Ltd.

About Us

BETTER FASTENER INDUSTRY CO., LTD.

Better Fastener is a professional fastener enterprise specializing in the manufacturing of steel washers, stainless steel washers, spring washers and sealingwashers. Founded in 2001 as a washer factory, the company expanded into a comprehensive enterprise integrating washers, nuts, bolts, spring nuts and other fastener products in 2010. DIN 603:2017 Large Round Head Square Neck Bolt Suppliers in China.

The company positions itself as a provider of comprehensive one-stop services for customers, relying on technological R&D, industrial investment and trade distribution.

With an experienced professional team and a sound sales network, Better Fastener has achieved excellent sales performance in both domestic and foreign markets,and has grown into one of the competitive manufacturers and suppliers in China's industrial fastener industry.

Better Fastener is committed to becoming a trusted fastener supplier for customers with reliable product quality, reasonable prices and on-time delivery

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