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Heavy Round Washers

Heavy Round Washers
How to measure washers
Two ways to confirm before you order - whichever you already know.
1If you know your bolt size

Washers are named by the bolt they fit: an M10 washer suits an M10 bolt. The inside diameter is slightly larger than the bolt so it slides on. Our guide covers every size and washer type we stock.

Open the washer measuring guide ›

Open the washer gauge sizing chart ›

2If you have a washer in hand

Measure the inside diameter (ID), outside diameter (OD) and thickness, as shown in the drawing.

Washer measurement diagram - inside diameter, outside diameter and thickness

MATERIALS

Mild Steel Galvanised — Hot-dip galvanised, the most common option for outdoor structural use.

Mild Steel Zinc Plated — Economical option for protected applications.

A2-70 G304 Stainless Steel — Outdoor and food/chemical applications.

A4-70 G316 Marine Grade Stainless — Coastal and marine applications. Largely non-magnetic.

WHEN TO USE A HEAVY WASHER

Pick a heavy washer when the clamping load is high enough to dish a standard-gauge flat washer, when the bearing material is soft enough that the load needs spreading over a thicker plate, or when the application calls for the larger OD typically supplied with heavy gauge.

WHY AUSTRALIA TRUSTS BOLT & NUT

With 15+ years selling fasteners online from Brisbane, we hold over 25,000 stock lines and 200 million pieces — 98.75% of online orders placed before 1pm leave same day. Save more as you buy more — we offer up to 13 price breaks plus 3 spend-tier discounts. Read our customer reviews or get in touch if you need help picking the right heavy washer.

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Heavy round washers are a thicker, more robust version of the standard flat round washer. The extra gauge resists deformation under high clamping loads, making them the right choice for structural connections, retaining wall hardware, and any joint where a standard washer would dish or compress.

TECHNICAL RESOURCES

Need help identifying your washer? See our washer measuring guide, or check the washer gauge sizing chart.

For full sizing data and standards, see our Technical PDFs library.

Filter by :
Filter By
Category
System of Measurement
  1. Metric 49 items
Size
  1. M6 (6mm) 4 items
  2. M8 (8mm) 4 items
  3. M10 (10mm) 6 items
  4. M12 (12mm) 6 items
  5. M16 (16mm) 5 items
  6. M20 (20mm) 5 items
  7. M22 (22mm) 1 item
  8. M24 (24mm) 5 items
  9. M27 (27mm) 1 item
  10. M30 (30mm) 3 items
  11. M33 (33mm) 1 item
  12. M36 (36mm) 1 item
  13. M39 (39mm) 1 item
  14. M42 (42mm) 1 item
  15. M45 (45mm) 1 item
  16. M48 (48mm) 1 item
  17. M52 (52mm) 1 item
  18. M56 (56mm) 1 item
  19. M64 (64mm) 1 item
To Suit Fastener Size
  1. M6 | 1/4" | 12g | 14g | #12 4 items
  2. M8 | 5/16" 4 items
  3. M10 6 items
  4. M12 | 1/2" 6 items
  5. M16 | 5/8" 5 items
  6. M20 | 3/4" 5 items
  7. M22 | 7/8" 1 item
  8. M24 5 items
  9. M27 | 1-1/8" 1 item
  10. M30 3 items
  11. M33 | 1-1/4" 1 item
  12. M36 | 1-1/2" 1 item
  13. M39 | 1-5/8" 1 item
  14. M42 1 item
  15. M45 | 1-3/4" 1 item
  16. M48 1 item
  17. M52 | 2" 1 item
  18. M56 | 2-1/4" 1 item
  19. M64 | 2-1/2" 1 item
Material / Finish
  1. Galvanised 28 items
  2. Plain Black Uncoated 8 items
  3. Zinc Silver Plated 13 items
Class / Grade
  1. Low Tensile Class 4.6 49 items
Corrosion Protection Level
  1. Excellent 28 items
  2. Moderate 13 items
  3. Low 8 items
Inside Measurement Range Guide
  1. 6.10 - 7.10mm 4 items
  2. 8.20 - 9.30mm 4 items
  3. 10.20 - 11.70mm 6 items
  4. 12.20 - 14.00mm 6 items
  5. 16.80 - 18.60mm 5 items
  6. 20.10 - 22.50mm 5 items
  7. 22.30 - 24.50mm 1 item
  8. 24.50 - 27.50mm 5 items
  9. 31.00 - 33.00mm 1 item
  10. 33.00 - 36.00mm 4 items
  11. 39.00 - 43.00mm 2 items
  12. 44.00 - 46.00mm 1 item
  13. 47.00 - 50.00mm 1 item
  14. 51.00 - 53.00mm 1 item
  15. 53.70 - 56.00mm 1 item
  16. 61.00 - 63.00mm 1 item
  17. 69.50 - 72.00mm 1 item
Outside Dia. Range Guide
  1. 15.00 - 19.99mm 7 items
  2. 25.00 - 29.99mm 10 items
  3. 30.00 - 34.99mm 4 items
  4. 35.00 - 39.99mm 5 items
  5. 40.00 - 49.99mm 1 item
  6. 50.00 - 59.99mm 8 items
  7. 60.00 - 69.99mm 4 items
  8. 70.00 - 79.99mm 5 items
  9. 90.00 - 99.99mm 2 items
  10. 100.00 - 140.00mm 3 items
Thickness Range Guide
  1. 1.00 - 1.49mm 3 items
  2. 1.50 - 1.99mm 9 items
  3. 2.00 - 2.49mm 4 items
  4. 2.50 - 2.99mm 13 items
  5. 3.50 - 3.99mm 10 items
  6. 5.00 - 5.99mm 5 items
  7. 6.00 - 6.99mm 3 items
  8. 7.00 - 7.99mm 2 items
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