Socket Countersunk Head Screws Metric Series

  1. The screws will generally conforms to IS : 2269, ISO 10642 and DIN 7991.
  2. Threads will confirm to class 4g6g of IS : 4218, Coarse Series.
  3. Material : Mita High Grade Alloy Steel.
  4. Heat Treatment : HRC 38 – 44.
  5. Propety Class : 12.9.
  6. Sizes in brackets are non-preferred standards.
  7. All dimensions are in millimeters.
Thread Size Pitch A Max F Min. H Ref. R Ref. W Nom. L Max.
M3 0.50 6.0 1.05 1.7 0.50 2.0 30
M4 0.70 8.0 1.49 2.3 0.70 2.5 30
M5 0.80 10.0 1.86 2.8 0.70 3.0 35
M6 1.00 12.0 2.16 3.3 0.85 4.0 40
M8 1.25 16.0 2.85 4.4 1.20 5.0 45
M10 1.50 20.0 3.60 5.5 1.50 6.0 55
M12 1.75 24.0 4.30 6.5 1.85 8.0 60
M16 2.00 30.0 4.89 7.5 1.85 10.0 70
M20 2.50 36.0 5.60 8.5 1.85 12.0 100

Physical Properties

Ultimate Tensile Strength, Min. 1,050 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% mm2 9% Min.

Socket Countersunk Head Screws Inch Series – Dimensions

Thread Size T.P.I. A Max F Min. H Min. R Ref. W Nom. L Max.
BSW BSF
3/16 24 32 0.356 0.065 0.085 0.025 3/32 1
1/4 20 26 0.475 0.085 0.113 0.025 5/32 1 1/4
5/16 18 22 0.594 0.105 0.142 0.025 3/16 1 1/4

Physical Properties

Ultimate Tensile Strength, Min. 1,60,000 lbf/in2
Yield strength, 0.2% offset, Min. 1,44,000 lbf/in2
Shear strength, Min. 96,000 lbf/in2
Elongation % on GL = 5.65
Where A = Cross sectional area
9% Min.
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