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DIN 557 Square Nuts – Manufacturer, Exporter & Supplier

We manufacture and export DIN 557 Square Nuts conforming to exact DIN 557 dimensional and mechanical specifications. Available in 5 / 8 / A2 / A4, our DIN 557 square nuts pass rigorous in-house testing — hardness, tensile and dimensional — before dispatch. ISO 9001:2015 certified production, EN 10204 3.1 mill test reports supplied as standard, and dedicated export documentation for 50+ destination countries.
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DIN 557 Key Specifications

The core specification data for DIN 557 Square Nuts, at a glance.

Standard

DIN 557

Type

Square Nuts

Size Range

M1.6 to M20

Thread Pitch

Coarse

Property Class / Grade

5 / 8 / A2 / A4

Head / Drive Type

Square

About DIN 557 Square Nuts

DIN 557 Square Nuts are square nuts produced and tested to the exact requirements of the DIN 557 specification. Featuring a Square configuration with Coarse thread form, they are available in property classes 5 / 8 / A2 / A4 across a size range of M1.6 to M20. The DIN 557 standard governs dimensional tolerances, mechanical properties including tensile strength, proof load and hardness, as well as surface finish requirements to ensure dependable performance in Timber Construction and Furniture applications worldwide.
Our DIN 557 Square Nuts are cold-forged from certified bar stock, heat-treated where required, and thread-rolled to guarantee consistent fit and fatigue performance. Every batch is documented with an EN 10204 3.1 Mill Test Report covering chemical composition, mechanical test results and dimensional inspection. Available in zinc electroplated, hot-dip galvanised, Geomet, Dacromet and black oxide finishes to match corrosion-resistance requirements for Agricultural Machinery, General Engineering and General Engineering applications. As a global exporter of DIN 557 fasteners, we consolidate orders with other standard-specification items into single shipments, backed by complete customs documentation for over 50 countries.
Technical Specifications

Raw Material

5 Alloy / Stainless Steel

Country of Origin

India

Standard Body

DIN

Corrosion Resistance

Salt-spray tested to relevant grade

Recommended Torque

Per property class / grade

Storage Conditions

Dry, corrosion-inhibited packing

DIN 557 Dimensions & Size Chart

Precise dimensional data for every DIN 557 Square Nuts size, cross-referenced against the standard’s key measurement points.
Size (M)b (mm)e min (mm)m (mm)a (mm)
M35.56.352.45.5
M47.08.083.27.0
M58.09.244.08.0
M610.011.635.010.0
M813.015.126.513.0
M1017.019.778.017.0
M1219.022.7810.019.0
M1624.027.6513.024.0
M2030.034.6416.030.0
Key Dimension Callouts

d

Nominal internal thread diameter of the square nut.

m

Overall nut height measured parallel to thread axis.

s

Width across opposite flats of the square nut.

e

Diagonal distance across opposite corners of the nut.

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DIN 557 Square Nuts – Material Grades & Property Classes

DIN 557 Square Nuts are available across multiple property classes and surface finish options to match load-bearing and corrosion-resistance requirements for Timber Construction, Furniture and Agricultural Machinery applications.
Property Classes
5 8 A2 A4
Surface Treatments
Zinc Electroplated Hot-Dip Galvanised (HDG) Geomet Coating Dacromet Coating Black Oxide Phosphate & Oil Plain (Self Colour) Nickel Plated

Why Choose Us for DIN 557 Square Nuts?

Nine reasons buyers worldwide rely on us as their DIN 557 Square Nuts manufacturer and export partner.
ISO Certified Production

Every batch of DIN 557 Square Nuts is manufactured under an ISO 9001:2015 certified quality management system with full in-process control.

EN 10204 3.1 MTR Supplied

A mill test report covering chemical composition, tensile, hardness and dimensional inspection accompanies every DIN 557 Square Nuts shipment.

48-hr Dispatch on Stock Items

Commonly stocked DIN 557 Square Nuts sizes leave our warehouse within 48 hours of order confirmation, minimising your downtime.

Export to 50+ Countries

Established freight and customs partners ensure reliable delivery of DIN 557 Square Nuts to buyers in over 50 countries worldwide.

Custom Sizes & Lengths

Non-standard DIN 557 Square Nuts lengths, diameters and special thread pitches are produced to order to match your drawing requirements.

Competitive Factory Pricing

Direct-from-factory pricing on DIN 557 Square Nuts with no middleman markup, offering the best value on volume and repeat orders.

In-House Metallurgical Testing

Hardness, tensile strength and dimensional checks for DIN 557 Square Nuts are performed in our in-house laboratory before every release.

Consolidated Multi-Standard Shipping

Combine DIN 557 Square Nuts with other standard-specification fasteners into a single container shipment to reduce freight costs.

Dedicated Export Documentation Team

Our specialist team prepares all customs, compliance and shipping paperwork for every DIN 557 Square Nuts export order.

DIN 557 Square Nuts – Applications & End Uses

DIN 557 Square Nuts are widely specified across multiple industries. Select an industry below to see how our DIN 557 square nuts are applied.
DIN 557 Square Nuts are used in timber construction for critical fastening applications where dimensional accuracy and mechanical performance are essential. Grade 5 is most commonly specified for timber construction environments.
In furniture, DIN 557 Square Nuts are valued for consistent dimensions and reliable load-bearing capability. We supply with full test documentation to support quality audits and project inspections.
DIN 557 Square Nuts are used in agricultural machinery assemblies where precise torque control and consistent fit are critical. We supply to OEM manufacturers and contractors with custom packaging formats.
For general engineering applications, DIN 557 Square Nuts are supplied with material test reports, dimensional inspection certificates and PPAP documentation where required.
DIN 557 Square Nuts for general engineering use are selected from stainless steel or coated grades to provide appropriate corrosion resistance while maintaining specified mechanical performance.
In general engineering applications, DIN 557 Square Nuts are fastened into assemblies requiring long-term reliability. Our export-packaged DIN 557 square nuts arrive protected from transit corrosion with full documentation.

Request a Quote for DIN 557 Square Nuts

Get pricing and lead times for your required sizes and quantities. ISO 9001 certified. EN 10204 3.1 MTR supplied. Export to 50+ countries.
022-6743-7972
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Frequently Asked Questions About DIN 557

Common questions from buyers sourcing DIN 557 Square Nuts, covering sizes, grades, documentation and lead times.
We supply DIN 557 Square Nuts from M1.6 to M20 in Coarse thread. Standard lengths are stocked; non-standard lengths are produced to order. Contact us with your exact requirements for availability confirmation.
DIN 557 Square Nuts are supplied in 5 / 8 / A2 / A4. Carbon and alloy steel grades comply with ISO 898-1 and stainless steel grades comply with ISO 3506. ASTM grades are available for USA and Canadian export orders.
Every DIN 557 Square Nuts order includes an EN 10204 3.1 Mill Test Report covering chemical composition, tensile strength, hardness and proof load. Third-party inspection by SGS, BV or TUV can be arranged on request.
Stocked DIN 557 Square Nuts sizes dispatch within 48 hours of order confirmation. Custom lengths, special grades or surface finishes typically ship within 2-3 weeks. Contact us for a specific lead time on your required size and quantity.

Industrial Cities We Serve:

  • Ahmedabad
  • Aurangabad
  • Bengaluru
  • Chennai
  • Coimbatore
  • Faridabad
  • Gandhidham
  • Greater Noida
  • Gurugram
  • Hazira
  • Hosur
  • Hyderabad
  • Jamnagar
  • Jamshedpur
  • Ludhiana
  • Mumbai
  • Mundra
  • Mysuru
  • Nagpur
  • Nashik
  • Navi Mumbai
  • Noida
  • Pune
  • Rajkot
  • Sanand
  • Surat
  • Thane
  • Tiruppur
  • Vadodara
  • Visakhapatnam

Countries We Export To:

  • US
  • Canada
  • Mexico
  • Germany
  • UK
  • France
  • Italy
  • Spain
  • Netherlands
  • Belgium
  • Poland
  • Sweden
  • Norway
  • Denmark
  • Turkey
  • UAE
  • Saudi Arabia
  • Qatar
  • Oman
  • Kuwait
  • Bahrain
  • South Africa
  • Egypt
  • Nigeria
  • Australia
  • New Zealand
  • Singapore
  • Malaysia
  • Indonesia
  • Thailand
  • Vietnam
  • South Korea
  • Japan
  • Brazil