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Button Head

Button Head
Not sure what size or thread you have or need?
Two ways to confirm before you order - whichever you already know about your fastener.
1If you know the fastener diameter

Compare your fastener to our visual size guide to confirm M-size, pitch and length.

Open the identification guide ›

2If you have the driver bit

Match your driver bit to the screw recess - Phillips, Pozi, slot or internal hex. Our Driving range lists the bit size for every drive type we stock.

Browse driver bits ›

Button head machine screws have a low, rounded domed head with an internal hex (Allen) socket and a fully threaded shank for tapped holes or nuts. The wide, shallow head gives a smart finished appearance and a broad bearing face, with a lower profile than a cap head.

Also known as: Socket Button Screw, Dome Socket Screw, Button Socket Cap Screw.

Used for covers, panels, brackets and trim where a clean rounded head and low clearance are preferred over a tall cap head.

DRIVE TYPES

Internal hex (Allen) - driven with a hex key for high torque without cam-out. Matching keys and bits are in our Driving section.

MATERIALS

Stocked in G304 and G316 stainless and carbon. For the full button socket screw range see our Button Head Socket Screws category.

THREAD SYSTEMS

Available in metric coarse and fine, plus imperial (UNC/UNF and BSW) threads. Machine screws are fully threaded with a uniform diameter and need a pre-tapped hole or a matching nut - they do not cut their own thread.

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 machine screw.

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Items 1-40 of 83

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  1. Free shipping

    In stock

    M2 x 0.40p Metric Coarse Stainless A2-70 G304 Button Head Socket (1.27mm Key) Screws ISO 7380
    M2 x 0.40p Metric Coarse Stainless A2-70 G304 Button Head Socket (1.27mm Key) Screws ISO 7380
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    M2.5 x 0.45p Metric Coarse Stainless A2-70 G304 Button Head Socket (1.5mm Key) Screws ISO 7380
    M2.5 x 0.45p Metric Coarse Stainless A2-70 G304 Button Head Socket (1.5mm Key) Screws ISO 7380
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    M2.5 x 0.45p Metric Coarse Plain Black Uncoated Class 12.9 Button Head Socket (1.5mm Key) Screws ISO 7380
    M2.5 x 0.45p Metric Coarse Plain Black Uncoated Class 12.9 Button Head Socket (1.5mm Key) Screws ISO 7380
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  4. Free shipping

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    M3 x 0.50p Metric Coarse Zinc Class 12.9 Button Head Socket (2mm Key) Screws ISO 7380
    M3 x 0.50p Metric Coarse Zinc Class 12.9 Button Head Socket (2mm Key) Screws ISO 7380
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    In stock

    M3 x 0.50p Metric Coarse Stainless A2-70 G304 Button Head Socket (2mm Key) Screws ISO 7380
    M3 x 0.50p Metric Coarse Stainless A2-70 G304 Button Head Socket (2mm Key) Screws ISO 7380
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  6. Free shipping

    In stock

    M3 x 0.50p Metric Coarse Stainless A4-70 G316 Button Head Socket (2mm Key) Screws ISO 7380
    M3 x 0.50p Metric Coarse Stainless A4-70 G316 Button Head Socket (2mm Key) Screws ISO 7380
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  7. Free shipping

    In stock

    M3 x 0.50p Metric Coarse Plain Black Uncoated Class 12.9 Button Head Socket (2mm Key) Screws ISO 7380
    M3 x 0.50p Metric Coarse Plain Black Uncoated Class 12.9 Button Head Socket (2mm Key) Screws ISO 7380
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  8. Free shipping

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    M3 x 0.50p Metric Coarse Stainless A2-70 G304 Button Post Torx (T10) Security Machine Screws
    M3 x 0.50p Metric Coarse Stainless A2-70 G304 Button Post Torx (T10) Security Machine Screws
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  9. Free shipping

    In stock

    M4 x 0.70p Metric Coarse Zinc Class 12.9 Button Head Socket (2.5mm Key) Screws ISO 7380
    M4 x 0.70p Metric Coarse Zinc Class 12.9 Button Head Socket (2.5mm Key) Screws ISO 7380
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  10. Free shipping

    In stock

    M4 x 0.70p Metric Coarse Stainless A2-70 G304 Button Head Socket (2.5mm Key) Screws ISO 7380
    M4 x 0.70p Metric Coarse Stainless A2-70 G304 Button Head Socket (2.5mm Key) Screws ISO 7380
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  11. Free shipping

    In stock

    M4 x 0.70p Metric Coarse Stainless A4-70 G316 Button Head Socket (2.5mm Key) Screws ISO 7380
    M4 x 0.70p Metric Coarse Stainless A4-70 G316 Button Head Socket (2.5mm Key) Screws ISO 7380
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  12. Free shipping

    In stock

    M4 x 0.70p Metric Coarse Plain Black Uncoated Class 12.9 Button Head Socket (2.5mm Key) Screws ISO 7380
    M4 x 0.70p Metric Coarse Plain Black Uncoated Class 12.9 Button Head Socket (2.5mm Key) Screws ISO 7380
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  13. Free shipping

    In stock

    M4 x 0.70p Metric Coarse Stainless A2-70 G304 Button Post Torx (T20) Security Machine Screws
    M4 x 0.70p Metric Coarse Stainless A2-70 G304 Button Post Torx (T20) Security Machine Screws
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  14. Free shipping

    In stock

    M4 x 0.70p Metric Coarse Stainless A2-70 G304 Button Post Hex (2.5mm) Security Machine Screws
    M4 x 0.70p Metric Coarse Stainless A2-70 G304 Button Post Hex (2.5mm) Security Machine Screws
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  15. Free shipping

    In stock

    M5 x 0.80p Metric Coarse Zinc Class 12.9 Button Head Socket (3mm Key) Screws ISO 7380
    M5 x 0.80p Metric Coarse Zinc Class 12.9 Button Head Socket (3mm Key) Screws ISO 7380
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  16. Free shipping

    In stock

    M5 x 0.80p Metric Coarse Stainless A2-70 G304 Button Head Socket (3mm Key) Screws ISO 7380
    M5 x 0.80p Metric Coarse Stainless A2-70 G304 Button Head Socket (3mm Key) Screws ISO 7380
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  17. Free shipping

    In stock

    M5 x 0.80p Metric Coarse Stainless A4-70 G316 Button Head Socket (3mm Key) Screws ISO 7380
    M5 x 0.80p Metric Coarse Stainless A4-70 G316 Button Head Socket (3mm Key) Screws ISO 7380
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  18. Free shipping

    In stock

    M5 x 0.80p Metric Coarse Plain Black Uncoated Class 12.9 Button Head Socket (3mm Key) Screws ISO 7380
    M5 x 0.80p Metric Coarse Plain Black Uncoated Class 12.9 Button Head Socket (3mm Key) Screws ISO 7380
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  19. Free shipping

    In stock

    M5 x 0.80p Metric Coarse Stainless A2-70 G304 Button Post Torx (T25) Security Machine Screws
    M5 x 0.80p Metric Coarse Stainless A2-70 G304 Button Post Torx (T25) Security Machine Screws
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  20. Free shipping

    In stock

    M5 x 0.80p Metric Coarse Stainless A2-70 G304 Button Post Hex (3mm) Security Machine Screws
    M5 x 0.80p Metric Coarse Stainless A2-70 G304 Button Post Hex (3mm) Security Machine Screws
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  21. Free shipping

    In stock

    M6 x 1.00p Metric Coarse Zinc Class 12.9 Button Head Socket (4mm Key) Screws ISO 7380
    M6 x 1.00p Metric Coarse Zinc Class 12.9 Button Head Socket (4mm Key) Screws ISO 7380
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    In stock

    M6 x 1.00p Metric Coarse Stainless A2-70 G304 Button Head Socket (4mm Key) Screws ISO 7380
    M6 x 1.00p Metric Coarse Stainless A2-70 G304 Button Head Socket (4mm Key) Screws ISO 7380
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  23. Free shipping

    In stock

    M6 x 1.00p Metric Coarse Stainless A4-70 G316 Button Head Socket (4mm Key) Screws ISO 7380
    M6 x 1.00p Metric Coarse Stainless A4-70 G316 Button Head Socket (4mm Key) Screws ISO 7380
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  24. Free shipping

    In stock

    M6 x 1.00p Metric Coarse Plain Black Uncoated Class 12.9 Button Head Socket (4mm Key) Screws ISO 7380
    M6 x 1.00p Metric Coarse Plain Black Uncoated Class 12.9 Button Head Socket (4mm Key) Screws ISO 7380
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  25. Free shipping

    In stock

    M6 x 1.00p Metric Coarse Stainless A2-70 G304 Button Post Torx (T30) Security Machine Screws
    M6 x 1.00p Metric Coarse Stainless A2-70 G304 Button Post Torx (T30) Security Machine Screws
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  26. Free shipping

    In stock

    M6 x 1.00p Metric Coarse Stainless A2-70 G304 Button Post Hex (4mm) Security Machine Screws
    M6 x 1.00p Metric Coarse Stainless A2-70 G304 Button Post Hex (4mm) Security Machine Screws
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  27. Free shipping

    In stock

    M8 x 1.25p Metric Coarse Zinc Class 12.9 Button Head Socket (5mm Key) Screws ISO 7380
    M8 x 1.25p Metric Coarse Zinc Class 12.9 Button Head Socket (5mm Key) Screws ISO 7380
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  28. Free shipping

    In stock

    M8 x 1.25p Metric Coarse Stainless A2-70 G304 Button Head Socket (5mm Key) Screws ISO 7380
    M8 x 1.25p Metric Coarse Stainless A2-70 G304 Button Head Socket (5mm Key) Screws ISO 7380
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  29. Free shipping

    In stock

    M8 x 1.25p Metric Coarse Stainless A4-70 G316 Button Head Socket (5mm Key) Screws ISO 7380
    M8 x 1.25p Metric Coarse Stainless A4-70 G316 Button Head Socket (5mm Key) Screws ISO 7380
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  30. Free shipping

    In stock

    M8 x 1.25p Metric Coarse Plain Black Uncoated Class 12.9 Button Head Socket (5mm Key) Screws ISO 7380
    M8 x 1.25p Metric Coarse Plain Black Uncoated Class 12.9 Button Head Socket (5mm Key) Screws ISO 7380
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  31. Free shipping

    In stock

    M8 x 1.25p Metric Coarse Stainless A2-70 G304 Button Torx (T40) Machine Screws ISO 7380
    M8 x 1.25p Metric Coarse Stainless A2-70 G304 Button Torx (T40) Machine Screws ISO 7380
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    M8 x 1.25p Metric Coarse Stainless A2-70 G304 Button Post Torx (T40) Security Machine Screws
    M8 x 1.25p Metric Coarse Stainless A2-70 G304 Button Post Torx (T40) Security Machine Screws
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    In stock

    M8 x 1.25p Metric Coarse Stainless A2-70 G304 Button Post Hex (5mm) Security Machine Screws
    M8 x 1.25p Metric Coarse Stainless A2-70 G304 Button Post Hex (5mm) Security Machine Screws
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    In stock

    M10 x 1.50p Metric Coarse Zinc Class 12.9 Button Head Socket (6mm Key) Screws ISO 7380
    M10 x 1.50p Metric Coarse Zinc Class 12.9 Button Head Socket (6mm Key) Screws ISO 7380
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    M10 x 1.50p Metric Coarse Stainless A2-70 G304 Button Head Socket (6mm Key) Screws ISO 7380
    M10 x 1.50p Metric Coarse Stainless A2-70 G304 Button Head Socket (6mm Key) Screws ISO 7380
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    M10 x 1.50p Metric Coarse Stainless A4-70 G316 Button Head Socket (6mm Key) Screws ISO 7380
    M10 x 1.50p Metric Coarse Stainless A4-70 G316 Button Head Socket (6mm Key) Screws ISO 7380
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    In stock

    M10 x 1.50p Metric Coarse Plain Black Uncoated Class 12.9 Button Head Socket (6mm Key) Screws ISO 7380
    M10 x 1.50p Metric Coarse Plain Black Uncoated Class 12.9 Button Head Socket (6mm Key) Screws ISO 7380
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    M10 x 1.50p Metric Coarse Stainless A2-70 G304 Button Torx (T50) Machine Screws ISO 7380
    M10 x 1.50p Metric Coarse Stainless A2-70 G304 Button Torx (T50) Machine Screws ISO 7380
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    M10 x 1.50p Metric Coarse Stainless A2-70 G304 Button Post Torx (T45) Security Machine Screws
    M10 x 1.50p Metric Coarse Stainless A2-70 G304 Button Post Torx (T45) Security Machine Screws
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    M12 x 1.75p Metric Coarse Zinc Class 12.9 Button Head Socket (8mm Key) Screws ISO 7380
    M12 x 1.75p Metric Coarse Zinc Class 12.9 Button Head Socket (8mm Key) Screws ISO 7380
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A low, broad domed head with an internal hex (Allen) socket - a neat, finished look with a wide bearing face. Lower profile than a cap head, in stainless and carbon, metric and imperial.

TECHNICAL RESOURCES

Key charts and specification sheets: Imperial vs Metric Strength Chart

For the full library, see our Technical PDF's Library.

Filter by :
Filter By
Category
System of Measurement
  1. Metric 46 items
  2. Imperial 37 items
Size
  1. M2 (2mm) 1 item
  2. M2.5 (2.5mm) 2 items
  3. M3 (3mm) 5 items
  4. M4 (4mm) 6 items
  5. M5 (5mm) 6 items
  6. M6 (6mm) 6 items
  7. M8 (8mm) 7 items
  8. M10 (10mm) 6 items
  9. M12 (12mm) 6 items
  10. M16 (16mm) 1 item
  11. #0-80 1 item
  12. #2-56 2 items
  13. #4-40 2 items
  14. #5-40 2 items
  15. #6-32 2 items
  16. #8-32 3 items
  17. #10-24 (3/16") 3 items
  18. #10-32 (3/16") 2 items
  19. 1/4" 5 items
  20. 5/16" 5 items
  21. 3/8" 6 items
  22. 1/2" 4 items
Size & Thread Pitch
  1. M2 x 0.40p Coarse 1 item
  2. M2.5 x 0.45p Coarse 2 items
  3. M3 x 0.50p Coarse 5 items
  4. M4 x 0.70p Coarse 6 items
  5. M5 x 0.80p Coarse 6 items
  6. M6 x 1.00p Coarse 6 items
  7. M8 x 1.25p Coarse 7 items
  8. M10 x 1.50p Coarse 6 items
  9. M12 x 1.75p Coarse 6 items
  10. M16 x 2.00p Coarse 1 item
  11. #0-80 TPI UNF 1 item
  12. #2-56 TPI UNC 2 items
  13. #4-40 TPI UNC 2 items
  14. #5-40 TPI UNC 2 items
  15. #6-32 TPI UNC 2 items
  16. #8-32 TPI UNC 3 items
  17. #10-24 (3/16") x 24 TPI UNC 3 items
  18. #10-32 (3/16") x 32 TPI UNF 2 items
  19. 1/4" x 20 TPI UNC 3 items
  20. 1/4" x 28 TPI UNF 2 items
  21. 5/16" x 18 TPI UNC 3 items
  22. 5/16" x 24 TPI UNF 2 items
  23. 3/8" x 16 TPI UNC 4 items
  24. 3/8" x 24 TPI UNF 2 items
  25. 1/2" x 13 TPI UNC 3 items
  26. 1/2" x 20 TPI UNF 1 item
Length
  1. 3mm 1 item
  2. 4mm 5 items
  3. 5mm 7 items
  4. 6mm 18 items
  5. 8mm 23 items
  6. 10mm 31 items
  7. 12mm 35 items
  8. 16mm 42 items
  9. 20mm 44 items
  10. 25mm 41 items
  11. 30mm 41 items
  12. 35mm 30 items
  13. 40mm 37 items
  14. 45mm 18 items
  15. 50mm 35 items
  16. 55mm 10 items
  17. 60mm 25 items
  18. 65mm 4 items
  19. 70mm 15 items
  20. 75mm 4 items
  21. 80mm 19 items
  22. 90mm 7 items
  23. 100mm 14 items
  24. 120mm 3 items
  25. 1/8" 3 items
  26. 3/16" 2 items
  27. 1/4" 16 items
  28. 5/16" 5 items
  29. 3/8" 21 items
  30. 1/2" 26 items
  31. 5/8" 25 items
  32. 3/4" 33 items
  33. 7/8" 5 items
  34. 1" 35 items
  35. 1-1/4" 24 items
  36. 1-3/8" 1 item
  37. 1-1/2" 26 items
  38. 1-3/4" 2 items
  39. 2" 24 items
  40. 2-1/4" 1 item
  41. 2-1/2" 12 items
  42. 3" 12 items
  43. 3-1/4" 1 item
  44. 3-1/2" 3 items
  45. 4" 4 items
Material / Finish
  1. Plain Black Uncoated 23 items
  2. Stainless Steel 47 items
  3. Zinc Silver Plated 13 items
Class / Grade
  1. A2-70 G304 40 items
  2. A4-70 G316 7 items
  3. High Tensile Grade 10.9 21 items
  4. High Tensile Class 12.9 15 items
Corrosion Protection Level
  1. Ultimate 7 items
  2. Excellent 40 items
  3. Moderate 13 items
  4. Low 23 items
Head Type
  1. Button Head 83 items
Head Diameter Range
  1. 2.65 - 2.90mm 1 item
  2. 3.20 - 3.50mm 1 item
  3. 3.90 - 4.20mm 2 items
  4. 4.10 - 4.60mm 2 items
  5. 5.10 - 5.70mm 7 items
  6. 5.75 - 6.05mm 2 items
  7. 6.35 - 6.70mm 2 items
  8. 7.24 - 7.93mm 9 items
  9. 8.82 - 9.50mm 11 items
  10. 10.07 - 10.50mm 6 items
  11. 10.65 - 11.10mm 5 items
  12. 13.39 - 14.00mm 12 items
  13. 15.20 - 16.70mm 6 items
  14. 17.00 - 18.00mm 6 items
  15. 20.48 - 21.00mm 6 items
  16. 21.60 - 22.30mm 4 items
  17. 27.00 - 28.50mm 1 item
Drive Type
  1. Internal Hex 68 items
  2. Post (Pin) Hex 4 items
  3. Post (Pin) Torx 8 items
  4. Torx 3 items
Drive Size
  1. 1.27mm 1 item
  2. 1.5mm 2 items
  3. 2mm 4 items
  4. 2.5mm 5 items
  5. 3mm 5 items
  6. 4mm 5 items
  7. 5mm 5 items
  8. 6mm 4 items
  9. 8mm 4 items
  10. 10mm 1 item
  11. 0.035" 1 item
  12. 0.050" 2 items
  13. 1/16" 2 items
  14. 5/64" 4 items
  15. 3/32" 3 items
  16. 1/8" 5 items
  17. 5/32" 5 items
  18. 3/16" 5 items
  19. 7/32" 5 items
  20. 5/16" 4 items
  21. T10 1 item
  22. T20 1 item
  23. T25 1 item
  24. T30 1 item
  25. T40 2 items
  26. T45 2 items
  27. T50 1 item
  28. T55 2 items
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