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Flange Nut

Flange Nut
Not sure what nut you have?
Two ways to identify it - whichever is easier with what is in front of you.
1If you have the nut

Find the spanner that fits it snugly, then measure the hole. Our nut identification chart lists every metric and imperial nut we stock side by side, sorted by spanner size.

Open the nut identification chart ›

2If you have its bolt

The fastest check is the male thread: the right nut spins onto its bolt by hand with no force. Identify the bolt size and pitch first with our bolt and screw guide, and the nut follows.

Open the bolt and screw guide ›

MATERIALS AND FINISHES

Available finishes: Stainless Steel, Zinc Silver Plated, Zinc Yellow Plated, Nylon, Galvanised.

GRADES, SIZES AND THREADS

Grades stocked: High Tensile Class 8, A2-70 G304, High Tensile Grade 5, Low Tensile Class 4.6, A4-70 G316.

Sizes: M10 (10mm), M12 (12mm), M8 (8mm), M4 (4mm), M5 (5mm), M6 (6mm), 3/8", M16 (16mm).

Thread systems: Metric - Coarse, UNC / BSW - Coarse, UNF - Fine, Metric - Fine.

STANDARDS

DIN 6923, IFI 145 / B18 2.2, HEC / CL12.

These flange nuts pair with our bolts, washers and threaded rod. See our Technical Resources page for tightening torques and spec PDFs.

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 product.

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Hex flange nuts have an integrated washer face under the hex, distributing clamp load over a wider area without needing a separate flat washer. Serrated variants bite into the surface and resist back-off under vibration — the standard for automotive, structural and high-throughput assembly. We stock 86+ variants across the flange nut range.

TECHNICAL RESOURCES

Need help identifying your nut? See our guide to identifying the size of your nut.

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

Filter by :
Filter By
Category
System of Measurement
  1. Metric 55 items
  2. Imperial 24 items
Size
  1. M3 (3mm) 2 items
  2. M4 (4mm) 6 items
  3. M5 (5mm) 6 items
  4. M6 (6mm) 6 items
  5. M8 (8mm) 8 items
  6. M10 (10mm) 9 items
  7. M12 (12mm) 10 items
  8. M16 (16mm) 5 items
  9. M20 (20mm) 3 items
  10. #6-32 1 item
  11. #8-32 2 items
  12. #10-24 (3/16") 2 items
  13. 1/4" 3 items
  14. 5/16" 4 items
  15. 3/8" 5 items
  16. 7/16" 2 items
  17. 1/2" 3 items
  18. 5/8" 1 item
  19. 3/4" 1 item
Size & Thread Pitch
  1. M3 x 0.50p Coarse 2 items
  2. M4 x 0.70p Coarse 6 items
  3. M5 x 0.80p Coarse 6 items
  4. M6 x 1.00p Coarse 6 items
  5. M8 x 1.25p Coarse 8 items
  6. M10 x 1.25p Fine 1 item
  7. M10 x 1.50p Coarse 8 items
  8. M12 x 1.25p Extra Fine 1 item
  9. M12 x 1.50p Fine 1 item
  10. M12 x 1.75p Coarse 8 items
  11. M16 x 2.00p Coarse 5 items
  12. M20 x 2.50p Coarse 3 items
  13. #6-32 TPI UNC 1 item
  14. #8-32 TPI UNC 2 items
  15. #10-24 (3/16") x 24 TPI UNC 2 items
  16. 1/4" x 20 TPI UNC 3 items
  17. 5/16" x 18 TPI UNC 3 items
  18. 5/16" x 24 TPI UNF 1 item
  19. 3/8" x 16 TPI UNC 4 items
  20. 3/8" x 24 TPI UNF 1 item
  21. 7/16" x 14 TPI UNC 2 items
  22. 1/2" x 13 TPI UNC 2 items
  23. 1/2" x 20 TPI UNF 1 item
  24. 5/8" x 11 TPI UNC 1 item
  25. 3/4" x 10 TPI UNC 1 item
Thread Type
  1. Metric - Coarse 52 items
  2. Metric - Fine 3 items
  3. UNC / BSW - Coarse 21 items
  4. UNF - Fine 3 items
Material / Finish
  1. Galvanised 5 items
  2. Nylon 8 items
  3. Stainless Steel 25 items
  4. Zinc Silver Plated 26 items
  5. Zinc Yellow Plated 15 items
Class / Grade
  1. A2-70 G304 18 items
  2. A4-70 G316 7 items
  3. Low Tensile Class 4.6 8 items
  4. High Tensile Grade 5 15 items
  5. High Tensile Class 8 23 items
  6. High Tensile Grade 8 3 items
  7. High Tensile Class 12 5 items
Corrosion Protection Level
  1. Ultimate 7 items
  2. Excellent 36 items
  3. Moderate 36 items
Serrations under Head
  1. Yes 65 items
  2. No 14 items
Overall Nut Height Range Guide
  1. 3.30 - 4.00mm 2 items
  2. 4.00 - 4.35mm 2 items
  3. 4.35 - 4.65mm 5 items
  4. 4.70 - 5.60mm 10 items
  5. 5.64 - 6.00mm 9 items
  6. 6.50 - 8.00mm 11 items
  7. 8.38 - 10.00mm 17 items
  8. 11.10 - 12.00mm 12 items
  9. 12.50 - 13.00mm 1 item
  10. 13.84 - 14.45mm 1 item
  11. 14.70 - 16.00mm 3 items
  12. 16.00 - 16.80mm 3 items
  13. 16.90 - 19.70mm 2 items
  14. 19.80 - 22.50mm 1 item
Spanner Size
  1. 5.5mm 2 items
  2. 7mm 6 items
  3. 5/16" 1 item
  4. 8mm 6 items
  5. 11/32" 2 items
  6. 3/8" 2 items
  7. 10mm 6 items
  8. 7/16" 3 items
  9. 1/2" 4 items
  10. 13mm 8 items
  11. 9/16" 5 items
  12. 15mm 8 items
  13. 16mm 1 item
  14. 11/16" 2 items
  15. 18mm 9 items
  16. 19mm 1 item
  17. 3/4" 3 items
  18. 15/16" 1 item
  19. 24mm 5 items
  20. 1-1/8" 1 item
  21. 30mm 3 items
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