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Countersunk Head

Countersunk 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 ›

Countersunk head machine screws have a flat-faced tapered head that sits flush with or below the surface when driven into a matching countersunk recess. They provide a clean, snag-free finish on panels, brackets, enclosures and machinery covers where a protruding head would cause clearance issues, injury risk or aesthetic problems.

Also known as: Flat Head Machine Screw, CSK Machine Screw, Metal Thread Countersunk.

Fully threaded with uniform diameter — require a pre-tapped hole or nut. Install into a pre-countersunk hole machined to the correct angle (82° for standard metric machine screws).

DRIVE TYPES

Phillips (PH1 and PH2) — Most common across the range. Matching Phillips bits in our Driving section.

Slot — Traditional slotted drive for electrical, plumbing and heritage applications.

MATERIALS

Zinc Plated — Bright silver, internal use. Standard choice for panels, electronics and general engineering.

Black Zinc Plated — Dark aesthetic finish for architectural metalwork and visible internal applications.

A2-70 G304 Stainless — External and coastal use. Largely non-magnetic — Work-hardening magnetism is normal.

Brass — For electrical, marine, plumbing and decorative applications.

Nylon — For electrical isolation and lightweight assemblies.

THREAD SYSTEMS

Metric Coarse — M2 to M12 across a full length range.

British Association (BA) — 0BA to 6BA for legacy electrical equipment and specialist instrumentation.

FASTENER LENGTH

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 121-160 of 169

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    In stock

    #8-32 TPI UNC Coarse Stainless A2-70 G304 Countersunk Phillips (PH2) Machine Screws ASNI B18.6.3
    #8-32 TPI UNC Coarse Stainless A2-70 G304 Countersunk Phillips (PH2) Machine Screws ASNI B18.6.3
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    #8-32 TPI UNC Coarse Stainless A2-70 G304 Countersunk Head Socket (3/32" Key) Screws ANSI B18.3
    #8-32 TPI UNC Coarse Stainless A2-70 G304 Countersunk Head Socket (3/32" Key) Screws ANSI B18.3
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    #8-32 TPI UNC Coarse Plain Black Uncoated Grade 10.9 Countersunk Head Socket (3/32" Key) Screws ANSI B 18.3
    #8-32 TPI UNC Coarse Plain Black Uncoated Grade 10.9 Countersunk Head Socket (3/32" Key) Screws ANSI B 18.3
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    5/32" x 32 TPI BSW Coarse Brass Countersunk Slot Machine Screws AS B50
    5/32" x 32 TPI BSW Coarse Brass Countersunk Slot Machine Screws AS B50
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    #10-24 (3/16) x 24 TPI UNC Coarse Zinc Plated Grade 10.9 Countersunk Head Socket (1/8" Key) Screws ANSI B 18.3
    #10-24 (3/16) x 24 TPI UNC Coarse Zinc Plated Grade 10.9 Countersunk Head Socket (1/8" Key) Screws ANSI B 18.3
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    In stock

    #10-24 (3/16") x 24 TPI UNC Coarse Stainless A2-70 G304 Countersunk Head Socket (1/8" Key) Screws ANSI B18.3
    #10-24 (3/16") x 24 TPI UNC Coarse Stainless A2-70 G304 Countersunk Head Socket (1/8" Key) Screws ANSI B18.3
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    In stock

    #10-24 (3/16) x 24 TPI UNC Coarse Plain Black Uncoated Grade 10.9 Countersunk Head Socket (1/8" Key) Screws ANSI B 18.3
    #10-24 (3/16) x 24 TPI UNC Coarse Plain Black Uncoated Grade 10.9 Countersunk Head Socket (1/8" Key) Screws ANSI B 18.3
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    In stock

    #10-32 (3/16") x 32 TPI UNF Fine Stainless A2-70 G304 Countersunk Head Socket (1/8" Key) Screws ANSI B18.3
    #10-32 (3/16") x 32 TPI UNF Fine Stainless A2-70 G304 Countersunk Head Socket (1/8" Key) Screws ANSI B18.3
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    In stock

    #10-32 (3/16") x 32 TPI UNF Fine Plain Black Uncoated Grade 10.9 Countersunk Head Socket (1/8" Key) Screws ANSI B 18.3
    #10-32 (3/16") x 32 TPI UNF Fine Plain Black Uncoated Grade 10.9 Countersunk Head Socket (1/8" Key) Screws ANSI B 18.3
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  15. Free shipping

    In stock

    3/16" x 24 TPI BSW Coarse Stainless A2-70 G304 Countersunk Phillips (PH2) Machine Screws ASNI B18.6.3
    3/16" x 24 TPI BSW Coarse Stainless A2-70 G304 Countersunk Phillips (PH2) Machine Screws ASNI B18.6.3
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    In stock

    3/16" x 24 TPI BSW Coarse Stainless A4-70 G316 Countersunk Phillips (PH2) Machine Screws ASNI B18.6.3
    3/16" x 24 TPI BSW Coarse Stainless A4-70 G316 Countersunk Phillips (PH2) Machine Screws ASNI B18.6.3
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  17. Free shipping

    In stock

    3/16" x 24 TPI BSW Coarse Brass Countersunk Slot Machine Screws AS B50
    3/16" x 24 TPI BSW Coarse Brass Countersunk Slot Machine Screws AS B50
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  18. Free shipping

    In stock

    #10-32 (3/16") x 32 TPI UNF Fine Stainless A2-70 G304 Countersunk Phillips (PH2) Machine Screws ASNI B18.6.3
    #10-32 (3/16") x 32 TPI UNF Fine Stainless A2-70 G304 Countersunk Phillips (PH2) Machine Screws ASNI B18.6.3
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    In stock

    #12-24 TPI UNC Coarse Stainless A2-70 G304 Countersunk Phillips (PH3) Machine Screws ASNI B18.6.3
    #12-24 TPI UNC Coarse Stainless A2-70 G304 Countersunk Phillips (PH3) Machine Screws ASNI B18.6.3
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    In stock

    1/4" x 20 TPI BSW Coarse Stainless A2-70 G304 Countersunk Phillips (PH3) Machine Screws ASNI B18.6.3
    1/4" x 20 TPI BSW Coarse Stainless A2-70 G304 Countersunk Phillips (PH3) Machine Screws ASNI B18.6.3
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    In stock

    1/4" x 20 TPI BSW Coarse Stainless A4-70 G316 Countersunk Phillips (PH3) Machine Screws ASNI B18.6.3
    1/4" x 20 TPI BSW Coarse Stainless A4-70 G316 Countersunk Phillips (PH3) Machine Screws ASNI B18.6.3
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  23. Free shipping

    In stock

    1/4" x 20 TPI UNC Coarse Zinc Plated Grade 10.9 Countersunk Head Socket (5/32" Key) Screws ANSI B 18.3
    1/4" x 20 TPI UNC Coarse Zinc Plated Grade 10.9 Countersunk Head Socket (5/32" Key) Screws ANSI B 18.3
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    1/4" x 20 TPI UNC Coarse Stainless A2-70 G304 Countersunk Head Socket (5/32" Key) Screws ANSI B18.3
    1/4" x 20 TPI UNC Coarse Stainless A2-70 G304 Countersunk Head Socket (5/32" Key) Screws ANSI B18.3
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    In stock

    1/4" x 20 TPI UNC Coarse Plain Black Uncoated Grade 10.9 Countersunk Head Socket (5/32" Key) Screws ANSI B 18.3
    1/4" x 20 TPI UNC Coarse Plain Black Uncoated Grade 10.9 Countersunk Head Socket (5/32" Key) Screws ANSI B 18.3
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  26. Free shipping

    In stock

    1/4" x 20 TPI BSW Coarse Brass Countersunk Slot Machine Screws AS B50
    1/4" x 20 TPI BSW Coarse Brass Countersunk Slot Machine Screws AS B50
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    In stock

    1/4" x 28 TPI UNF Fine Stainless A2-70 G304 Countersunk Head Socket (5/32" Key) Screws ANSI B18.3
    1/4" x 28 TPI UNF Fine Stainless A2-70 G304 Countersunk Head Socket (5/32" Key) Screws ANSI B18.3
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    In stock

    1/4" x 28 TPI UNF Fine Plain Black Uncoated Grade 10.9 Countersunk Head Socket (5/32" Key) Screws ANSI B 18.3
    1/4" x 28 TPI UNF Fine Plain Black Uncoated Grade 10.9 Countersunk Head Socket (5/32" Key) Screws ANSI B 18.3
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    5/16" x 18 TPI UNC Coarse Zinc Plated Grade 10.9 Countersunk Head Socket (3/16" Key) Screws ANSI B 18.3
    5/16" x 18 TPI UNC Coarse Zinc Plated Grade 10.9 Countersunk Head Socket (3/16" Key) Screws ANSI B 18.3
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    5/16" x 18 TPI UNC Coarse Stainless A2-70 G304 Countersunk Head Socket (3/16" Key) Screws ANSI B18.3
    5/16" x 18 TPI UNC Coarse Stainless A2-70 G304 Countersunk Head Socket (3/16" Key) Screws ANSI B18.3
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    5/16" x 18 TPI UNC Coarse Plain Black Uncoated Grade 10.9 Countersunk Head Socket (3/16" Key) Screws ANSI B 18.3
    5/16" x 18 TPI UNC Coarse Plain Black Uncoated Grade 10.9 Countersunk Head Socket (3/16" Key) Screws ANSI B 18.3
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    5/16" x 18 TPI BSW Coarse Stainless A2-70 G304 Countersunk Phillips (PH4) Machine Screws ASNI B18.6.3
    5/16" x 18 TPI BSW Coarse Stainless A2-70 G304 Countersunk Phillips (PH4) Machine Screws ASNI B18.6.3
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    5/16" x 18 TPI BSW Coarse Brass Countersunk Slot Machine Screws AS B50
    5/16" x 18 TPI BSW Coarse Brass Countersunk Slot Machine Screws AS B50
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  36. Free shipping

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    5/16" x 24 TPI UNF Fine Plain Black Uncoated Grade 10.9 Countersunk Head Socket (3/16" Key) Screws ANSI B 18.3
    5/16" x 24 TPI UNF Fine Plain Black Uncoated Grade 10.9 Countersunk Head Socket (3/16" Key) Screws ANSI B 18.3
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    3/8" x 16 TPI UNC Coarse Zinc Plated Grade 10.9 Countersunk Head Socket (7/32" Key) Screws ANSI B 18.3
    3/8" x 16 TPI UNC Coarse Zinc Plated Grade 10.9 Countersunk Head Socket (7/32" Key) Screws ANSI B 18.3
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    3/8" x 16 TPI UNC Coarse Stainless A2-70 G304 Countersunk Head Socket (7/32" Key) Screws ANSI B18.3
    3/8" x 16 TPI UNC Coarse Stainless A2-70 G304 Countersunk Head Socket (7/32" Key) Screws ANSI B18.3
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    3/8" x 16 TPI UNC Coarse Plain Black Uncoated Grade 10.9 Countersunk Head Socket (7/32" Key) Screws ANSI B 18.3
    3/8" x 16 TPI UNC Coarse Plain Black Uncoated Grade 10.9 Countersunk Head Socket (7/32" Key) Screws ANSI B 18.3
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Flat-faced tapered head that finishes flush with or below the surface when driven into a countersunk hole - for faces that must stay clean and snag-free. Phillips and slot drive, in zinc, black zinc, G304 stainless, brass and nylon.

TECHNICAL RESOURCES

Key charts and specification sheets: Imperial vs Metric Strength Chart

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

Filter by :
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Category
System of Measurement
  1. Metric 101 items
  2. Imperial 68 items
Size
  1. M1.6 (1.6mm) 1 item
  2. M2 (2mm) 5 items
  3. M2.5 (2.5mm) 7 items
  4. M3 (3mm) 13 items
  5. M3.5 (3.5mm) 1 item
  6. M4 (4mm) 15 items
  7. M5 (5mm) 15 items
  8. M6 (6mm) 15 items
  9. M8 (8mm) 13 items
  10. M10 (10mm) 6 items
  11. M12 (12mm) 5 items
  12. M14 (14mm) 2 items
  13. M16 (16mm) 3 items
  14. 6BA 1 item
  15. #2-56 3 items
  16. #3-48 1 item
  17. #4-40 3 items
  18. #4-48 1 item
  19. #5-40 2 items
  20. 1/8" 3 items
  21. #6-32 4 items
  22. #6-40 1 item
  23. 4BA 1 item
  24. 5/32" 3 items
  25. #8-32 4 items
  26. #8-36 1 item
  27. 3/16" (#10-24) 3 items
  28. 3/16" (#10-32) 1 item
  29. #10-24 (3/16") 3 items
  30. #10-32 (3/16") 2 items
  31. #12-24 1 item
  32. 2BA 1 item
  33. 1/4" 8 items
  34. 5/16" 8 items
  35. 3/8" 6 items
  36. 7/16" 2 items
  37. 1/2" 5 items
Size & Thread Pitch
  1. M1.6 x 0.35p Coarse 1 item
  2. M2 x 0.40p Coarse 5 items
  3. M2.5 x 0.45p Coarse 7 items
  4. M3 x 0.50p Coarse 13 items
  5. M3.5 x 0.60p Coarse 1 item
  6. M4 x 0.70p Coarse 15 items
  7. M5 x 0.80p Coarse 15 items
  8. M6 x 1.00p Coarse 15 items
  9. M8 x 1.25p Coarse 13 items
  10. M10 x 1.50p Coarse 6 items
  11. M12 x 1.75p Coarse 5 items
  12. M14 x 2.00p Coarse 2 items
  13. M16 x 2.00p Coarse 3 items
  14. #2-56 TPI UNC 3 items
  15. #3-48 TPI UNC 1 item
  16. 6BA x 0.53p Coarse 1 item
  17. #4-40 TPI UNC 3 items
  18. #4-48 TPI UNF 1 item
  19. 1/8" x 40 TPI BSW 3 items
  20. #5-40 TPI UNC 2 items
  21. 5/32" x 32 TPI BSW 3 items
  22. #6-32 TPI UNC 4 items
  23. #6-40 TPI UNF 1 item
  24. 4BA x 0.66p Coarse 1 item
  25. #8-32 TPI UNC 4 items
  26. #8-36 TPI UNF 1 item
  27. 2BA x 0.81p Coarse 1 item
  28. 3/16" (#10-24) x 24 TPI BSW 3 items
  29. #10-24 (3/16") x 24 TPI UNC 3 items
  30. #10-32 (3/16") x 32 TPI UNF 3 items
  31. #12-24 TPI UNC 1 item
  32. 1/4" x 20 TPI UNC 3 items
  33. 1/4" x 20 TPI BSW 3 items
  34. 1/4" x 28 TPI UNF 2 items
  35. 5/16" x 18 TPI BSW 3 items
  36. 5/16" x 18 TPI UNC 3 items
  37. 5/16" x 24 TPI UNF 2 items
  38. 3/8" x 16 TPI BSW 1 item
  39. 3/8" x 16 TPI UNC 3 items
  40. 3/8" x 24 TPI UNF 2 items
  41. 7/16" x 14 TPI UNC 1 item
  42. 7/16" x 20 TPI UNF 1 item
  43. 1/2" x 13 TPI UNC 3 items
  44. 1/2" x 20 TPI UNF 2 items
Length
  1. 3mm 3 items
  2. 4mm 10 items
  3. 5mm 19 items
  4. 6mm 40 items
  5. 8mm 57 items
  6. 10mm 72 items
  7. 12mm 78 items
  8. 15mm 2 items
  9. 16mm 83 items
  10. 20mm 89 items
  11. 25mm 87 items
  12. 30mm 83 items
  13. 35mm 55 items
  14. 40mm 75 items
  15. 45mm 52 items
  16. 50mm 66 items
  17. 55mm 14 items
  18. 60mm 41 items
  19. 65mm 22 items
  20. 70mm 36 items
  21. 75mm 13 items
  22. 80mm 31 items
  23. 90mm 24 items
  24. 100mm 27 items
  25. 110mm 8 items
  26. 120mm 13 items
  27. 130mm 4 items
  28. 140mm 1 item
  29. 150mm 4 items
  30. 160mm 1 item
  31. 180mm 1 item
  32. 200mm 1 item
  33. 220mm 1 item
  34. 240mm 1 item
  35. 3/16" 6 items
  36. 1/4" 28 items
  37. 5/16" 10 items
  38. 3/8" 39 items
  39. 1/2" 47 items
  40. 5/8" 37 items
  41. 3/4" 62 items
  42. 7/8" 4 items
  43. 1" 61 items
  44. 1-1/4" 44 items
  45. 1-1/2" 48 items
  46. 1-3/4" 2 items
  47. 2" 41 items
  48. 2-1/2" 25 items
  49. 3" 23 items
  50. 3-1/2" 6 items
  51. 4" 7 items
  52. 4-1/2" 1 item
  53. 5" 1 item
  54. 6" 1 item
  55. 7" 1 item
  56. 8" 1 item
Material / Finish
  1. Brass 12 items
  2. Nylon 7 items
  3. Plain Black Uncoated 31 items
  4. Stainless Steel 95 items
  5. Zinc Silver Plated 24 items
Class / Grade
  1. A2-70 G304 67 items
  2. A4-70 G316 28 items
  3. Low Tensile Class 4.6 22 items
  4. High Tensile Grade 10.9 28 items
  5. High Tensile Class 12.9 17 items
Corrosion Protection Level
  1. Ultimate 40 items
  2. Excellent 74 items
  3. Moderate 24 items
  4. Low 31 items
Part or Full Thread
  1. Full Thread (FT) 1 item
Head Type
  1. Countersunk Head 169 items
Head Diameter Range
  1. 2.75 - 3.00mm 1 item
  2. 3.50 - 4.40mm 6 items
  3. 4.40 - 5.50mm 15 items
  4. 5.50 - 6.40mm 18 items
  5. 6.30 - 7.10mm 6 items
  6. 7.00 - 8.00mm 19 items
  7. 8.00 - 9.20mm 16 items
  8. 9.00 - 10.45mm 15 items
  9. 10.40 - 12.00mm 18 items
  10. 12.10 - 13.49mm 4 items
  11. 13.20 - 13.90mm 4 items
  12. 14.00 - 16.00mm 18 items
  13. 15.20 - 16.70mm 1 item
  14. 17.50 - 18.00mm 1 item
  15. 18.20 - 21.45mm 12 items
  16. 21.40 - 22.00mm 1 item
  17. 22.15 - 24.00mm 10 items
  18. 26.73 - 27.00mm 1 item
  19. 29.50 - 30.00mm 3 items
Drive Type
  1. Eye Drive / Snake Eye 3 items
  2. Internal Hex 81 items
  3. Phillips 39 items
  4. Post (Pin) Hex 4 items
  5. Post (Pin) Torx 6 items
  6. Slot 31 items
  7. Torx 5 items
Drive Size
  1. 1.27mm 1 item
  2. 1.3mm 1 item
  3. 1.5mm 3 items
  4. 2mm 4 items
  5. 2.5mm 5 items
  6. 3mm 5 items
  7. 4mm 5 items
  8. 5mm 5 items
  9. 6mm 4 items
  10. 8mm 4 items
  11. 10mm 5 items
  12. 0.050" 2 items
  13. 1/16" 4 items
  14. 5/64" 6 items
  15. 3/32" 4 items
  16. 1/8" 5 items
  17. 5/32" 5 items
  18. 3/16" 5 items
  19. 7/32" 5 items
  20. 1/4" 2 items
  21. 5/16" 5 items
  22. 1/2" 1 item
  23. PH0 1 item
  24. PH1 11 items
  25. PH2 16 items
  26. PH3 6 items
  27. PH4 5 items
  28. T10 2 items
  29. T20 2 items
  30. T25 2 items
  31. T30 2 items
  32. T40 1 item
  33. T45 2 items
  34. SL4 1 item
  35. SL5 7 items
  36. SL6 7 items
  37. SL8 5 items
  38. SL10 10 items
  39. SL12 1 item
  40. #8 1 item
  41. #10 1 item
  42. #12 1 item
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