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Cap Head

Cap 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 ›

Cap head machine screws use a cylindrical head with an internal hex (Allen) socket and are fully threaded for tapped holes or a matching nut. The compact head and deep socket give a high, reliable clamp load in a small footprint, and they sit flush when used in counterbored holes.

Also known as: Socket Head Cap Screw, Allen Cap Screw, SHCS, Cap Screw.

Used across machinery, jigs and fixtures, tooling, hydraulics and general engineering assembly where a strong, low-profile fixing is needed in a tapped hole.

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 high-tensile carbon. For the full engineering-grade cap screw range (Class 12.9 and the complete size span), see our Cap 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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    In stock

    M1.6 x 0.35p Metric Coarse Stainless A2-70 G304 Socket (1.5mm Key) Head Cap Screws DIN 912 / ISO 4762
    M1.6 x 0.35p Metric Coarse Stainless A2-70 G304 Socket (1.5mm Key) Head Cap Screws DIN 912 / ISO 4762
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  2. Free shipping

    In stock

    M1.6 x 0.35p Metric Coarse Stainless A4-70 G316 Socket (1.5mm Key) Head Cap Screws DIN 912 / ISO 4762
    M1.6 x 0.35p Metric Coarse Stainless A4-70 G316 Socket (1.5mm Key) Head Cap Screws DIN 912 / ISO 4762
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  3. Free shipping

    In stock

    M1.6 x 0.35p Metric Coarse Plain Black Uncoated Class 12.9 Socket (1.5mm Key) Head Cap Screws DIN 912 / ISO 4762
    M1.6 x 0.35p Metric Coarse Plain Black Uncoated Class 12.9 Socket (1.5mm Key) Head Cap Screws DIN 912 / ISO 4762
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  4. Free shipping

    In stock

    M2 x 0.40p Metric Coarse Stainless A2-70 G304 Socket (1.5mm Key) Head Cap Screws DIN 912 / ISO 4762
    M2 x 0.40p Metric Coarse Stainless A2-70 G304 Socket (1.5mm Key) Head Cap Screws DIN 912 / ISO 4762
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  5. Free shipping

    In stock

    M2 x 0.40p Metric Coarse Stainless A4-70 G316 Socket (1.5mm Key) Head Cap Screws DIN 912 / ISO 4762
    M2 x 0.40p Metric Coarse Stainless A4-70 G316 Socket (1.5mm Key) Head Cap Screws DIN 912 / ISO 4762
    As low as each

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  6. Free shipping

    In stock

    M2 x 0.40p Metric Coarse Plain Black Uncoated Class 12.9 Socket (1.5mm Key) Head Cap Screws DIN 912 / ISO 4762
    M2 x 0.40p Metric Coarse Plain Black Uncoated Class 12.9 Socket (1.5mm Key) Head Cap Screws DIN 912 / ISO 4762
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  7. Free shipping

    In stock

    M2 x 0.40p Metric Coarse Stainless A4-70 G316 Socket (T6) Machine Screws ISO 14579
    M2 x 0.40p Metric Coarse Stainless A4-70 G316 Socket (T6) Machine Screws ISO 14579
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  8. Free shipping

    In stock

    M2.5 x 0.45p Metric Coarse Stainless A2-70 G304 Socket (2mm Key) Head Cap Screws DIN 912 / ISO 4762
    M2.5 x 0.45p Metric Coarse Stainless A2-70 G304 Socket (2mm Key) Head Cap Screws DIN 912 / ISO 4762
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  9. Free shipping

    In stock

    M2.5 x 0.45p Metric Coarse Stainless A4-70 G316 Socket (2mm Key) Head Cap Screws DIN 912 / ISO 4762
    M2.5 x 0.45p Metric Coarse Stainless A4-70 G316 Socket (2mm Key) Head Cap Screws DIN 912 / ISO 4762
    As low as each

    Length From Under The Head

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  10. Free shipping

    In stock

    M2.5 x 0.45p Metric Coarse Plain Black Uncoated Class 12.9 Socket (2mm Key) Head Cap Screws DIN 912 / ISO 4762
    M2.5 x 0.45p Metric Coarse Plain Black Uncoated Class 12.9 Socket (2mm Key) Head Cap Screws DIN 912 / ISO 4762
    As low as each

    Length From Under The Head

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  11. Free shipping

    In stock

    M2.5 x 0.45p Metric Coarse Stainless A4-70 G316 Socket (T8) Machine Screws ISO 14579
    M2.5 x 0.45p Metric Coarse Stainless A4-70 G316 Socket (T8) Machine Screws ISO 14579
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  12. Free shipping

    In stock

    M3 x 0.50p Metric Coarse Zinc Class 12.9 Socket (2.5mm Key) Head Cap Screws DIN 912 / ISO 4762
    M3 x 0.50p Metric Coarse Zinc Class 12.9 Socket (2.5mm Key) Head Cap Screws DIN 912 / ISO 4762
    As low as each

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  13. Free shipping

    In stock

    M3 x 0.50p Metric Coarse Stainless A2-70 G304 Socket (2.5mm Key) Head Cap Screws DIN 912 / ISO 4762
    M3 x 0.50p Metric Coarse Stainless A2-70 G304 Socket (2.5mm Key) Head Cap Screws DIN 912 / ISO 4762
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    Length From Under The Head

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  14. Free shipping

    In stock

    M3 x 0.50p Metric Coarse Stainless A4-70 G316 Socket (2.5mm Key) Head Cap Screws DIN 912 / ISO 4762
    M3 x 0.50p Metric Coarse Stainless A4-70 G316 Socket (2.5mm Key) Head Cap Screws DIN 912 / ISO 4762
    As low as each

    Length From Under The Head

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  15. Free shipping

    In stock

    M3 x 0.50p Metric Coarse Plain Black Uncoated Class 12.9 Socket (2.5mm Key) Head Cap Screws DIN 912 / ISO 4762
    M3 x 0.50p Metric Coarse Plain Black Uncoated Class 12.9 Socket (2.5mm Key) Head Cap Screws DIN 912 / ISO 4762
    As low as each

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  16. Free shipping

    In stock

    M4 x 0.70p Metric Coarse Zinc Class 12.9 Socket (3mm Key) Head Cap Screws DIN 912 / ISO 4762
    M4 x 0.70p Metric Coarse Zinc Class 12.9 Socket (3mm Key) Head Cap Screws DIN 912 / ISO 4762
    As low as each

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  17. Free shipping

    In stock

    M4 x 0.70p Metric Coarse Stainless A2-70 G304 Socket (3mm Key) Head Cap Screws DIN 912 / ISO 4762
    M4 x 0.70p Metric Coarse Stainless A2-70 G304 Socket (3mm Key) Head Cap Screws DIN 912 / ISO 4762
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    Length From Under The Head

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  18. Free shipping

    In stock

    M4 x 0.70p Metric Coarse Stainless A4-70 G316 Socket (3mm Key) Head Cap Screws DIN 912 / ISO 4762
    M4 x 0.70p Metric Coarse Stainless A4-70 G316 Socket (3mm Key) Head Cap Screws DIN 912 / ISO 4762
    As low as each

    Length From Under The Head

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  19. Free shipping

    In stock

    M4 x 0.70p Metric Coarse Plain Black Uncoated Class 12.9 Socket (3mm Key) Head Cap Screws DIN 912 / ISO 4762
    M4 x 0.70p Metric Coarse Plain Black Uncoated Class 12.9 Socket (3mm Key) Head Cap Screws DIN 912 / ISO 4762
    As low as each

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  20. Free shipping

    In stock

    M4 x 0.70p Metric Coarse Stainless A2-70 G304 Cap Torx (T20) Machine Screws ISO 14579
    M4 x 0.70p Metric Coarse Stainless A2-70 G304 Cap Torx (T20) Machine Screws ISO 14579
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  21. Free shipping

    In stock

    M5 x 0.80p Metric Coarse Zinc Class 12.9 Socket (4mm Key) Head Cap Screws DIN 912 / ISO 4762
    M5 x 0.80p Metric Coarse Zinc Class 12.9 Socket (4mm Key) Head Cap Screws DIN 912 / ISO 4762
    As low as each

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  22. Free shipping

    In stock

    M5 x 0.80p Metric Coarse Stainless A2-70 G304 Socket (4mm Key) Head Cap Screws DIN 912 / ISO 4762
    M5 x 0.80p Metric Coarse Stainless A2-70 G304 Socket (4mm Key) Head Cap Screws DIN 912 / ISO 4762
    As low as each

    Length From Under The Head

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  23. Free shipping

    In stock

    M5 x 0.80p Metric Coarse Stainless A4-70 G316 Socket (4mm Key) Head Cap Screws DIN 912 / ISO 4762
    M5 x 0.80p Metric Coarse Stainless A4-70 G316 Socket (4mm Key) Head Cap Screws DIN 912 / ISO 4762
    As low as each

    Length From Under The Head

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  24. Free shipping

    In stock

    M5 x 0.80p Metric Coarse Plain Black Uncoated Class 12.9 Socket (4mm Key) Head Cap Screws DIN 912 / ISO 4762
    M5 x 0.80p Metric Coarse Plain Black Uncoated Class 12.9 Socket (4mm Key) Head Cap Screws DIN 912 / ISO 4762
    As low as each

    Length From Under The Head

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  25. Free shipping

    In stock

    M5 x 0.80p Metric Coarse Stainless A2-70 G304 Cap Torx (T25) Machine Screws ISO 14579
    M5 x 0.80p Metric Coarse Stainless A2-70 G304 Cap Torx (T25) Machine Screws ISO 14579
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  26. Free shipping

    In stock

    M6 x 1.00p Metric Coarse Zinc Class 12.9 Socket (5mm Key) Head Cap Screws DIN 912 / ISO 4762
    M6 x 1.00p Metric Coarse Zinc Class 12.9 Socket (5mm Key) Head Cap Screws DIN 912 / ISO 4762
    As low as each

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    In stock

    M6 x 1.00p Metric Coarse Stainless A2-70 G304 Socket (5mm Key) Head Cap Screws DIN 912 / ISO 4762
    M6 x 1.00p Metric Coarse Stainless A2-70 G304 Socket (5mm Key) Head Cap Screws DIN 912 / ISO 4762
    As low as each

    Length From Under The Head

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  28. Free shipping

    In stock

    M6 x 1.00p Metric Coarse Stainless A4-70 G316 Socket (5mm Key) Head Cap Screws DIN 912 / ISO 4762
    M6 x 1.00p Metric Coarse Stainless A4-70 G316 Socket (5mm Key) Head Cap Screws DIN 912 / ISO 4762
    As low as each

    Length From Under The Head

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  29. Free shipping

    In stock

    M6 x 1.00p Metric Coarse Plain Black Uncoated Class 12.9 Socket (5mm Key) Head Cap Screws DIN 912 / ISO 4762
    M6 x 1.00p Metric Coarse Plain Black Uncoated Class 12.9 Socket (5mm Key) Head Cap Screws DIN 912 / ISO 4762
    As low as each

    Length From Under The Head

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  30. Free shipping

    In stock

    M6 x 1.00p Metric Coarse Stainless A2-70 G304 Cap Torx (T30) Machine Screws ISO 14579
    M6 x 1.00p Metric Coarse Stainless A2-70 G304 Cap Torx (T30) Machine Screws ISO 14579
    As low as each

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  31. Free shipping

    In stock

    M8 x 1.25p Metric Coarse Zinc Class 12.9 Socket (6mm Key) Head Cap Screws DIN 912 / ISO 4762
    M8 x 1.25p Metric Coarse Zinc Class 12.9 Socket (6mm Key) Head Cap Screws DIN 912 / ISO 4762
    As low as each

    Length From Under The Head

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    In stock

    M8 x 1.25p Metric Coarse Stainless A2-70 G304 Socket (6mm Key) Head Cap Screws DIN 912 / ISO 4762
    M8 x 1.25p Metric Coarse Stainless A2-70 G304 Socket (6mm Key) Head Cap Screws DIN 912 / ISO 4762
    As low as each

    Length From Under The Head

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  33. Free shipping

    In stock

    M8 x 1.25p Metric Coarse Stainless A4-70 G316 Socket (6mm Key) Head Cap Screws DIN 912 / ISO 4762
    M8 x 1.25p Metric Coarse Stainless A4-70 G316 Socket (6mm Key) Head Cap Screws DIN 912 / ISO 4762
    As low as each

    Length From Under The Head

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  34. Free shipping

    In stock

    M8 x 1.25p Metric Coarse Plain Black Uncoated Class 12.9 Socket (6mm Key) Head Cap Screws DIN 912 / ISO 4762
    M8 x 1.25p Metric Coarse Plain Black Uncoated Class 12.9 Socket (6mm Key) Head Cap Screws DIN 912 / ISO 4762
    As low as each

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A cylindrical socket-drive head with an internal hex (Allen) socket - a high-clamp, low-profile machine screw that drives cleanly in counterbored holes. Stainless and high-tensile 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.

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