+912267437972

+919022636025

enquiry@real-bolt.com

Contact Us

BS 4320 Metric Washers – Series A to G – Manufacturer, Exporter & Supplier

We manufacture and export BS 4320 Metric Washers – Series A to G conforming to exact BS 4320 dimensional and mechanical specifications. Available in 140 HV / A2 / A4, our BS 4320 flat washers 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.
Request a Quote
View Standards

BS 4320 Key Specifications

The core specification data for BS 4320 Metric Washers – Series A to G, at a glance.

Standard

BS 4320

Type

Metric Washers – Series A to G

Size Range

M4 to M36

Thread Pitch

—

Property Class / Grade

140 HV / A2 / A4

Head / Drive Type

Flat Round (Various OD Series)

About BS 4320 Metric Washers – Series A to G

BS 4320 Metric Washers – Series A to G are flat washers produced and tested to the exact requirements of the BS 4320 specification. Featuring a Flat Round (Various OD Series) configuration with — thread form, they are available in property classes 140 HV / A2 / A4 across a size range of M4 to M36. The BS 4320 standard governs dimensional tolerances, mechanical properties including tensile strength, proof load and hardness, as well as surface finish requirements to ensure dependable performance in UK Construction and General Engineering applications worldwide.
Our BS 4320 Metric Washers – Series A to G 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 Structural Steel, Maintenance and General Engineering applications. As a global exporter of BS 4320 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

140 HV Alloy / Stainless Steel

Country of Origin

India

Standard Body

BS

Corrosion Resistance

Salt-spray tested to relevant grade

Recommended Torque

Per property class / grade

Storage Conditions

Dry, corrosion-inhibited packing

BS 4320 Dimensions & Size Chart

Precise dimensional data for every BS 4320 Metric Washers – Series A to G size, cross-referenced against the standard’s key measurement points.
Nom. SizeSeriesd1 min (mm)d2 max (mm)h (mm)
M6A6.411.01.6
M6B6.414.01.6
M6C6.418.01.6
M8A8.415.01.6
M8C8.422.01.6
M10A10.518.02.0
M10C10.527.02.0
M12A13.020.02.5
M12C13.032.02.5
M16A17.027.03.0
M16C17.039.03.0
M20A21.034.03.0
M20C21.050.03.0
Key Dimension Callouts

d

Nominal bolt diameter the washer is intended to fit.

d1

Washer inside diameter providing clearance around the fastener.

d2

Washer outside diameter defining bearing surface spread.

t

Washer thickness between the two flat faces.

Browse Related BS Fastener Standards and Washer Dimensions

Additional BS fastener standards support accurate selection of bolts, screws, nuts, washers, stud bolts and threaded rods for industrial applications. Compare dimensions, tolerances, thread specifications, mechanical properties, material grades and quality requirements across the wider BS standards family to identify the correct engineering specifications for manufacturing, procurement and mechanical fastening needs.
BS 1768
BS 3692
BS 4190
BS EN ISO 4014
BS EN ISO 4017
BS EN ISO 4032

BS 4320 Metric Washers – Series A to G – Material Grades & Property Classes

BS 4320 Metric Washers – Series A to G are available across multiple property classes and surface finish options to match load-bearing and corrosion-resistance requirements for UK Construction, General Engineering and Structural Steel applications.
Property Classes
140 HV 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 BS 4320 Metric Washers – Series A to G?

Nine reasons buyers worldwide rely on us as their BS 4320 Metric Washers – Series A to G manufacturer and export partner.
ISO Certified Production

Every batch of BS 4320 Metric Washers – Series A to G 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 BS 4320 Metric Washers – Series A to G shipment.

48-hr Dispatch on Stock Items

Commonly stocked BS 4320 Metric Washers – Series A to G 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 BS 4320 Metric Washers – Series A to G to buyers in over 50 countries worldwide.

Custom Sizes & Lengths

Non-standard BS 4320 Metric Washers – Series A to G lengths, diameters and special thread pitches are produced to order to match your drawing requirements.

Competitive Factory Pricing

Direct-from-factory pricing on BS 4320 Metric Washers – Series A to G with no middleman markup, offering the best value on volume and repeat orders.

In-House Metallurgical Testing

Hardness, tensile strength and dimensional checks for BS 4320 Metric Washers – Series A to G are performed in our in-house laboratory before every release.

Consolidated Multi-Standard Shipping

Combine BS 4320 Metric Washers – Series A to G 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 BS 4320 Metric Washers – Series A to G export order.

BS 4320 Metric Washers – Series A to G – Applications & End Uses

BS 4320 Metric Washers – Series A to G are widely specified across multiple industries. Select an industry below to see how our BS 4320 flat washers are applied.
BS 4320 Metric Washers – Series A to G are used in uk construction for critical fastening applications where dimensional accuracy and mechanical performance are essential. Grade 140 HV is most commonly specified for uk construction environments.
In general engineering, BS 4320 Metric Washers – Series A to G are valued for consistent dimensions and reliable load-bearing capability. We supply with full test documentation to support quality audits and project inspections.
BS 4320 Metric Washers – Series A to G are used in structural steel assemblies where precise torque control and consistent fit are critical. We supply to OEM manufacturers and contractors with custom packaging formats.
For maintenance applications, BS 4320 Metric Washers – Series A to G are supplied with material test reports, dimensional inspection certificates and PPAP documentation where required.
BS 4320 Metric Washers – Series A to G 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, BS 4320 Metric Washers – Series A to G are fastened into assemblies requiring long-term reliability. Our export-packaged BS 4320 flat washers arrive protected from transit corrosion with full documentation.

Request a Quote for BS 4320 Metric Washers – Series A to G

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
+91 90226 36025
Email Us

Frequently Asked Questions About BS 4320

Common questions from buyers sourcing BS 4320 Metric Washers – Series A to G, covering sizes, grades, documentation and lead times.
We supply BS 4320 Metric Washers – Series A to G from M4 to M36 in — thread. Standard lengths are stocked; non-standard lengths are produced to order. Contact us with your exact requirements for availability confirmation.
BS 4320 Metric Washers – Series A to G are supplied in 140 HV / 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 BS 4320 Metric Washers – Series A to G 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 BS 4320 Metric Washers – Series A to G 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