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Washers

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.

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

Washers for Load Spreading, Locking, Sealing and Insulating

Choosing the wrong washer is one of the cheapest mistakes you can make with the biggest consequences — backed-off fasteners under vibration, crushed timber under a hex head, or galvanic corrosion where stainless meets mild steel. We stock over 920 washer variants in our Brisbane warehouse, from M1.6 micro-washers right through to M30 structural HSFG, and we ship same day on stocked lines.

Check our reviews from DIYers, tradespeople, builders, manufacturers, government, councils, engineers across Australia.

CHOOSING THE RIGHT WASHER TYPE

Washers do four main jobs: spread load, lock against vibration, seal, or insulate. Knowing which job you need is the start.

Flat Round Washers — The workhorse. Increase the bearing surface of a nut or bolt head, spreading clamping force across a larger area. Essential when working with soft materials, oversized holes, or irregular surfaces.

Spring & Lock Washers — Split lock, internal/external tooth, and Schnorr® washers create tension during tightening to resist loosening from vibration. Low-cost insurance for general-purpose joints.

Wedge-Lock Washers — Nord-Lock® and similar pairs use cams and serrations to mechanically lock the joint. The gold standard for severe vibration or dynamic loading. They cannot be loosened by vibration alone.

Disc & Wave Washers — Belleville, conical spring, and wave washers provide controlled spring action and accommodate thermal expansion, vibration, or distance between machine parts.

Structural Washers — HSFG K0 washers (3 dimples on the OD) are used in structural steel-to-steel bolted connections per AS1252:2016.

Insulating & Sealing Washers — Nylon shoulder washers insulate against electrical contact and galvanic corrosion; neoprene/EPDM roofing washers seal against weather.

MATERIALS WE STOCK

Mild Steel (Zinc Plated / Galvanised / Zinc Yellow / Black) — Low-cost, suits internal or protected external use. Zinc plated is the most common; galvanised is preferred for outdoor and treated timber.

A2-70 G304 Stainless Steel — The most popular stainless grade. Suitable for general outdoor use, food contact, and most chemical environments.

A4-70 G316 Marine Grade Stainless — The correct choice within 300 metres of the coast, or in chemical and food processing environments. Largely non-magnetic — A small degree of magnetism from work-hardening is normal.

High Tensile (Class 8.8 / 10.9 / 12.9, A4-80 G316) — For structural and high-load applications where standard washers would deform.

Nylon — Natural and black, used for electrical insulation, soft contact, and weather resistance. Highly resistant to chemicals and UV.

Brass — Non-magnetic, decorative finish, good corrosion resistance.

Red Fibre — Single-use sealing for plumbing and pipe unions.

Neoprene / EPDM — Weather sealing for roofing screws.

UNDERSTANDING WASHER SIZING

Washer sizes can be confusing, so here is the quickest way to find the right one. If you already have a bolt or screw, match the bolt size: an M6 bolt takes an M6 washer, M10 takes M10, and so on. Look for the size at the start of the description (e.g. "M6 Flat Round Washer").

If you only have a loose washer to match, measure the inside diameter and pick the next size down. The washer's inside is always slightly larger than the matching bolt so it slides on freely. For example, an inside measurement of approximately 6.50mm means you need an M6 washer; 17.25mm means you need an M16 washer.

The outside diameter is measured outside-to-outside. Thickness varies between batches - washers are not precision-made fasteners and slight variations are normal. All published measurements on this site should be used as a guide only.

If you are still unsure, our Technical PDF's Library has full sizing charts and DIN/ISO standards.

OUR RANGE AT A GLANCE

Flat Round Washers — Load spreading and bearing surface for nuts and bolt heads. The most common washer type.

Flat Round Washers DIN125 — Smaller OD flat washer to DIN 125 standard. Stainless A2-70 and A4-70.

Flat Round Washers DIN433 Small OD — Smallest type of flat washer, OD just over twice the ID. Stainless A2-70 and A4-70.

Spring Lock Washers — Split-ring spring washers for low-cost vibration resistance.

External & Internal Tooth Lock Washers — Serrated teeth bite into mating surfaces to resist rotation.

Nord-Lock® Washers — Wedge-locking pair that cannot loosen under vibration. The premium locking solution.

Schnorr® Washers — Conical serrated safety washer, original German design, high vibration resistance.

Belleville Washers — Disc spring for thermal expansion, vibration, and maintaining preload.

Conical Spring Washers — Serrated form M conical safety washer, similar function to a serrated flange nut.

Wave Washers — Wave form provides light spring action and takes up axial play.

Curved Washers — Single-direction curve, light thrust loads and axial play.

Cup Washers — Finishing washer for countersunk screws, often paired with self-tappers in sheet metal.

Shoulder Washers — Nylon insulating bushings for electrical and corrosion isolation.

Heavy Square Washers — Square plate for even load spreading in timber and steel.

Structural K0 Washers — HSFG washers to AS1252:2016 for structural steel connections.

Red Fibre Flat Round Washers — Single-use sealing gasket for plumbing and pipe unions.

Roofing Screw Washers — Neoprene/EPDM sealing washer for metal roofing self-drillers.

FREQUENTLY ASKED QUESTIONS

Can stainless fasteners be used with aluminium?

Yes — and for most applications, no special precautions are needed. The combination is widely used in industries where strength and corrosion resistance matter (marine, automotive, structural aluminium). For applications with sustained moisture or salt exposure, a few simple steps (barrier washer, sealant, matched-anodising) prevent any long-term galvanic corrosion concerns. Full guidance: Can stainless fasteners be used with aluminium?

What does a washer actually do?

Washers serve four main jobs: spreading load across a wider bearing area to prevent damage to the parent material, locking the joint against vibration loosening, sealing against moisture or pressure, and insulating against electrical or galvanic contact. Choosing the right washer for the job is as important as choosing the right bolt.

When should I use a spring washer vs a Nord-Lock® washer?

A split spring washer is the economical choice for general assembly where modest vibration resistance is enough. Nord-Lock® wedge-locking washers are designed for severe vibration and high-load joints — the matching pair creates a mechanical wedge that resists loosening even under cyclic loading. Use Nord-Lock® on critical structural and machinery joints; spring washers are fine for lighter-duty work.

What's the difference between flat round, mudguard, and structural washers?

Flat round washers (DIN125, DIN433) have a standard outside diameter sized to suit the bolt — used in most general fastening. Mudguard washers have a much larger OD relative to the bolt — used for spreading load on thin sheet, plastic or panels. Structural washers (HSFG, K0 to AS1252) are thicker and harder, designed for high-tensile structural steel connections.

Do I need a washer under both the bolt head AND the nut?

Best practice is yes — a washer under the head spreads load on that side, and a washer under the nut spreads load on the other side and reduces friction so the torque you apply translates more accurately into clamp load. For structural and high-load joints both washers are mandatory. For light internal assembly, one washer under the nut is often enough.

How do Belleville and wave washers differ from a normal spring washer?

A Belleville (disc spring) washer is a conical-shaped spring giving a high spring rate in a short stroke — used to maintain bolt preload against thermal expansion or load cycling. A wave washer has a wavy form and gives lighter spring action to take up axial play and absorb small vibrations. Both are spring-style washers but solve different problems.

When should I use a nylon shoulder washer?

Nylon shoulder washers insulate a bolt or screw electrically from the panel it passes through — common in electronics, control boxes, automotive earth-strap isolation and galvanic separation between dissimilar metals. The shoulder fits inside the hole, the flange sits between the bolt head and the panel, isolating both surfaces.

What size washer do I need for an M10 bolt?

For an M10 bolt, the standard flat washer is 10mm ID × 20mm OD × 2mm thick (ISO 7089 / DIN 125). A heavy-duty (Form A) variant is 21mm OD. A mudguard washer is 30mm OD and a structural washer is 22mm OD × 4mm thick. The bolt size determines the inside diameter; the application determines whether you want flat, mudguard or structural.

Can I reuse a spring washer?

Generally no. A spring washer works by compressing under bolt load and providing a return force that resists loosening. Once compressed, it loses most of its spring memory and won't provide the same locking force on reuse. The cost difference is minimal — replace spring washers whenever you re-tighten a connection that matters. Nord-Lock® and serrated flange designs are re-usable by design.

What's the difference between zinc-plated and galvanised washers?

Zinc-plated (zinc silver) is an electroplated thin zinc coating, typically 5-25 microns — fine for internal and protected environments but corrodes quickly outdoors. Galvanised is hot-dip immersion, typically 45-85 microns of metallurgically-bonded zinc — much heavier coating that lasts decades outdoors and is the standard finish for external and treated-timber applications. Galvanised is rougher in appearance; zinc-plated is bright silver.

When do I need a high-tensile structural washer?

Whenever the bolt is high-tensile (Class 8.8 or higher) and you're tightening to its rated preload. Standard flat washers can crush or dish under high clamp loads, which causes the joint to relax and the bolt to lose preload. Structural washers (AS1252) are thicker, harder and rated to carry the full preload of an HSFG K0 assembly without deformation.

Why are some washers serrated, knurled or have teeth?

The serrations or teeth bite into the bearing surface as the bolt is tightened, creating a mechanical lock against back-off under vibration. Internal-tooth lock washers grip under the bolt head; external-tooth grip the work surface; serrated flange washers do both. They're a one-trip part — once seated, the teeth deform the work surface and won't re-grip cleanly on reuse.

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 washer.

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    Belleville Washers
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    Conical Spring Washers
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    Countersunk Serrated Lock Washers
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    Cup Washers
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    Curved Washers
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    External & Internal Tooth Lock Washers
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    Flat Round Washers
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    Flat Round Washers DIN125
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    Flat Round Washers DIN433 Small OD
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    Heavy Round Washers
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    Heavy Square Washers
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    High Tensile Round Washers
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    Mudguard Round Washers
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    Nord-Lock® Washers
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    Nylon Flat Round Washers
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    Red Fibre Flat Round Washers
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    Roofing Screw Washers
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    Schnorr® Washers
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    Shoulder Washers
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    Spring Lock Washers
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    Structural K0 Washers
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    Wave Washers
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Find the right washers for your project at Bolt & Nut Australia. We stock a huge range of industrial washers online — flat, spring lock, mudguard, structural, tab, Nordlock, Schnorr and serrated. Available in stainless A2-70 G304 and A4-70 G316 marine, galvanised, zinc plate, brass and nylon. Order online for same-day Brisbane dispatch and free delivery Australia-wide.

TECHNICAL RESOURCES

Need help measuring your washer? See our how to identify and measure washers guide.

Every washer subcategory has its own CAD drawings and spec PDFs linked at the bottom of its page. For the full library covering washer and every other product range we stock, see our Technical PDF's Library.

Filter by :
Filter By
Category
System of Measurement
  1. Metric 634 items
  2. Imperial 288 items
Size
  1. M1.6 (1.6mm) 4 items
  2. M2 (2mm) 9 items
  3. M2.5 (2.5mm) 11 items
  4. M3 (3mm) 31 items
  5. M3.5 (3.5mm) 9 items
  6. M4 (4mm) 36 items
  7. M5 (5mm) 48 items
  8. M6 (6mm) 58 items
  9. M7 (7mm) 1 item
  10. M8 (8mm) 54 items
  11. M10 (10mm) 60 items
  12. M11 (11mm) 2 items
  13. M12 (12mm) 63 items
  14. M14 (14mm) 20 items
  15. M16 (16mm) 59 items
  16. M18 (18mm) 14 items
  17. M20 (20mm) 45 items
  18. M22 (22mm) 13 items
  19. M24 (24mm) 30 items
  20. M27 (27mm) 13 items
  21. M30 (30mm) 19 items
  22. M33 (33mm) 10 items
  23. M36 (36mm) 12 items
  24. M39 (39mm) 4 items
  25. M42 (42mm) 4 items
  26. M45 (45mm) 1 item
  27. M48 (48mm) 1 item
  28. M52 (52mm) 1 item
  29. M56 (56mm) 1 item
  30. M64 (64mm) 1 item
  31. 2g (2.20mm) 1 item
  32. 3/32" 2 items
  33. 4g (2.90mm) 1 item
  34. 5g (3.20mm) 1 item
  35. 1/8" 14 items
  36. 6g (3.50mm) 3 items
  37. 5/32" 13 items
  38. 8g (4.20mm) 3 items
  39. 10g (4.80mm) 3 items
  40. 3/16" (#10-24) 29 items
  41. 12g (5.50mm) 2 items
  42. 14g (6.30mm) 3 items
  43. 1/4" 37 items
  44. 5/16" 23 items
  45. 3/8" 34 items
  46. 7/16" 9 items
  47. 1/2" 22 items
  48. 9/16" 7 items
  49. 5/8" 14 items
  50. 3/4" 15 items
  51. 7/8" 11 items
  52. 1" 17 items
  53. 1-1/8" 5 items
  54. 1-1/4" 6 items
  55. 1-3/8" 1 item
  56. 1-1/2" 5 items
  57. 1-3/4" 1 item
  58. 2" 3 items
  59. 2-1/4" 1 item
  60. 2-1/2" 1 item
  61. 3" 1 item
To Suit Fastener Size
  1. M1.6 | 1-72 4 items
  2. M2 | #2 | 9BA 9 items
  3. 2g | 2.20mm Screw 1 item
  4. M2.5 | #3 | 7BA 13 items
  5. 4g | 2.90mm Screw 1 item
  6. M3 | 1/8" | #5 | 6BA 45 items
  7. 5g | 3.20mm Screw 1 item
  8. M3.5 | #6 9 items
  9. 6g | 3.50mm Screw 3 items
  10. M4 | 5/32" | 6g | 7g | 8g | #8 | 4BA 50 items
  11. 8g | 4.20mm Screw 2 items
  12. M5 | 3/16" | 10g | #10 | 2BA 78 items
  13. 10g | 4.80mm Screw 2 items
  14. 12g | 5.50mm Screw 2 items
  15. M6 | 12g 8 items
  16. M6 | 1/4" | 12g | 14g | #12 84 items
  17. 14g | 6.30mm Screw 3 items
  18. 1/4" | #12 3 items
  19. M7 1 item
  20. M8 | 5/16" 77 items
  21. 3/8" | 4BA 3 items
  22. M10 60 items
  23. M10 | 3/8" 31 items
  24. M11 | 7/16" 2 items
  25. 7/16" 9 items
  26. M12 16 items
  27. M12 | 1/2" 47 items
  28. 1/2" | 2BA 22 items
  29. M14 | 9/16" 27 items
  30. M16 | 5/8" 73 items
  31. M18 14 items
  32. 3/4" 6 items
  33. M20 | 3/4" 54 items
  34. M22 | 7/8" 24 items
  35. M24 45 items
  36. 1" 2 items
  37. M27 | 1-1/8" 18 items
  38. M30 19 items
  39. M33 | 1-1/4" 16 items
  40. M36 | 1-1/2" 18 items
  41. M39 | 1-5/8" 4 items
  42. M42 4 items
  43. M45 | 1-3/4" 2 items
  44. M48 1 item
  45. M52 | 2" 4 items
  46. M56 | 2-1/4" 2 items
  47. M64 | 2-1/2" 2 items
  48. 3" 1 item
Material / Finish
  1. Aluminium 1 item
  2. Black Zinc Plated 5 items
  3. Brass 23 items
  4. Delta Protekt Zinc Flake 47 items
  5. Galvanised 61 items
  6. Neoprene Black 4 items
  7. Nylon 124 items
  8. Plain Black Uncoated 8 items
  9. Red Fibre 6 items
  10. Stainless Steel 434 items
  11. Zinc Coated + Passivation 15 items
  12. Zinc Silver Plated 169 items
  13. Zinc Yellow Plated 25 items
Class / Grade
  1. A2-70 G304 228 items
  2. A4-70 G316 177 items
  3. High Tensile A4-80 G316 29 items
  4. Low Tensile Grade 2 103 items
  5. Low Tensile Class 4.6 140 items
  6. High Tensile Grade 8 19 items
  7. High Tensile Class 8.8 21 items
  8. High Tensile Grade 10.9 28 items
  9. High Tensile Grade 12.9 47 items
Corrosion Protection Level
  1. Ultimate 302 items
  2. Excellent 398 items
  3. Very Good 15 items
  4. Moderate 199 items
  5. Low 8 items
Inside Measurement Range Guide
  1. 1.65 - 1.90mm 4 items
  2. 2.10 - 2.40mm 10 items
  3. 2.60 - 2.90mm 12 items
  4. 2.90 - 3.05mm 2 items
  5. 3.10 - 3.60mm 35 items
  6. 3.60 - 4.00mm 23 items
  7. 4.10 - 4.50mm 1 item
  8. 4.10 - 4.70mm 51 items
  9. 5.00 - 5.75mm 78 items
  10. 5.10 - 5.50mm 1 item
  11. 5.75 - 6.20mm 7 items
  12. 6.10 - 6.70mm 1 item
  13. 6.10 - 7.10mm 51 items
  14. 6.50 - 7.50mm 38 items
  15. 7.30 - 7.80mm 2 items
  16. 8.00 - 8.50mm 1 item
  17. 8.05 - 8.10mm 4 items
  18. 8.20 - 9.30mm 70 items
  19. 9.60 - 10.40mm 10 items
  20. 10.20 - 10.75mm 1 item
  21. 10.20 - 11.70mm 80 items
  22. 11.30 - 12.60mm 18 items
  23. 12.20 - 13.00mm 1 item
  24. 12.20 - 14.00mm 73 items
  25. 14.20 - 14.70mm 1 item
  26. 14.20 - 15.60mm 23 items
  27. 15.60 - 16.60mm 3 items
  28. 15.90 - 16.20mm 7 items
  29. 16.20 - 17.00mm 1 item
  30. 16.20 - 17.30mm 22 items
  31. 16.80 - 18.60mm 40 items
  32. 18.20 - 19.60mm 13 items
  33. 19.20 - 21.10mm 8 items
  34. 20.10 - 22.50mm 51 items
  35. 20.90 - 22.10mm 1 item
  36. 22.30 - 24.50mm 24 items
  37. 24.50 - 27.50mm 44 items
  38. 27.50 - 29.50mm 16 items
  39. 29.10 - 31.80mm 4 items
  40. 31.00 - 33.00mm 19 items
  41. 33.00 - 36.00mm 16 items
  42. 36.50 - 39.00mm 13 items
  43. 39.00 - 43.00mm 10 items
  44. 43.00 - 44.00mm 2 items
  45. 44.00 - 46.00mm 2 items
  46. 47.00 - 50.00mm 2 items
  47. 51.00 - 53.00mm 1 item
  48. 53.70 - 56.00mm 4 items
  49. 61.00 - 63.00mm 2 items
  50. 67.00 - 69.50mm 1 item
  51. 69.50 - 72.00mm 1 item
  52. 79.00 - 81.00mm 1 item
Outside Dia. Range Guide
  1. 3.00 - 9.99mm 163 items
  2. 10.00 - 14.99mm 121 items
  3. 15.00 - 19.99mm 133 items
  4. 20.00 - 24.99mm 12 items
  5. 25.00 - 29.99mm 167 items
  6. 30.00 - 34.99mm 80 items
  7. 35.00 - 39.99mm 57 items
  8. 40.00 - 49.99mm 59 items
  9. 50.00 - 59.99mm 70 items
  10. 60.00 - 69.99mm 33 items
  11. 70.00 - 79.99mm 13 items
  12. 80.00 - 89.99mm 3 items
  13. 90.00 - 99.99mm 3 items
  14. 100.00 - 140.00mm 8 items
Thickness Range Guide
  1. 0.30 - 0.49mm 43 items
  2. 0.50 - 0.99mm 171 items
  3. 1.00 - 1.49mm 147 items
  4. 1.50 - 1.99mm 175 items
  5. 2.00 - 2.49mm 74 items
  6. 2.50 - 2.99mm 110 items
  7. 3.00 - 3.49mm 59 items
  8. 3.50 - 3.99mm 40 items
  9. 4.00 - 4.49mm 10 items
  10. 4.50 - 4.99mm 27 items
  11. 5.00 - 5.99mm 25 items
  12. 6.00 - 6.99mm 30 items
  13. 7.00 - 7.99mm 5 items
  14. 8.00 - 8.99mm 3 items
  15. 9.00 - 9.99mm 3 items
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