Socket Button Head Cap Screws Metric Series – UNC, UNF

  1. Threads will confirm to class 4g6g of IS : 4218, Coarse Series.
  2. Material : Mita High Grade Alloy Steel.
  3. Heat Treatment : HRC 38 – 44.
  4. Propety Class: 12.9. (Because of their head configurations, these screws may not meet the minimum ultimate tensile load for Property class 12.9)
  5. All dimensions are in millimeters.
Thread Size pitch A Max. H Max. F Min. S Ref. R Max. W Nom. L Max.
M3 0.50 5.70 1.65 1.05 3.1 0.35 2.0 20
M4 0.70 7.60 2.20 1.35 4.2 0.35 2.5 40
M5 0.80 9.50 2.75 1.92 5.3 0.45 3.0 40
M6 1.00 10.50 3.30 2.08 5.5 0.45 4.0 50
M8 1.25 14.00 4.40 2.75 7.4 0.50 5.0 50
M10 1.50 17.5 5.50 3.35 9.3 0.60 6.0 50
M12 1.75 21.00 6.60 4.16 11.0 0.70 8.0 50

Physical Properties

Ultimate Tensile Strength, Min. 1050 N/mm2 107 kgf/mm2
Yield strength, 0.2% offset, Min. 945 N/mm2 96.3 kgf/mm2
Shear strength, Min. 630 N/mm2 64.2 kgf/mm2
Elongation % on GL = 5.65
Where A = Cross sectional area
9% Min. 9% Min.
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