Metric Fine Tooth Hexagon Socket Head Screws

Metric Fine Tooth Hexagon Socket Head Screws

For assemblies demanding a higher degree of clamping precision and a slender head profile, our metric fine tooth hexagon socket head screws deliver immediate improvement over standard coarse-thread variants. The increased number of threads per inch extends the load distribution along the fastener axis, which significantly reduces the risk of vibrational loosening in machinery, automation equipment, and precision tooling. Builders who frequently source Fine Tooth Allen Socket Head Cap Screws will recognize the same thread principle applied here in the hexagon socket drive form, allowing finer adjustment torque and higher tensile clamping force per turn. Available across a broad metric diameter range, these fasteners are fully compatible with DIN 912 and ISO 4762 head dimensions while maintaining the tighter thread form that sets them apart.


When consistent joint stability and precise nut engagement are non-negotiable, Metric Fine Tooth Hexagon Socket Head Screws provide an engineered solution that minimises radial stress and handling effort during installation. The hexagon drive recess preserves excellent tool engagement, even at high seating torque, and accommodates repeated assembly cycles without cam-out. These screws are machined from alloy steel with a choice of 12.9 or 10.9 property class, as well as A2 and A4 stainless steel for corrosive environments. Each batch experiences thorough dimensional inspection, including pitch diameter verification, head concentricity check, and surface hardness testing, guaranteeing that every fastener leaves the warehouse ready for critical load-bearing structures, robotic end-effectors, and high-cycle fixtures.

Key Features & Benefits

  • Fine metric thread form increases strip resistance and vibration resilience compared to coarse pitch alternatives
  • Hexagon socket drive offers deep, uniform tool engagement with reduced head height for compact designs
  • Knurled head option available in select diameters to enable finger-tight starting before final torque
  • Materials certified to ISO 898-1 (alloy steel) and ISO 3506 (stainless steel) with full traceability
  • Available with plain, black oxide, zinc-nickel, or passivated finish to suit indoor and outdoor duty
  • Precision roll-threaded process maintains consistent pitch across the entire length – M3 through M24

Dimensional Specifications

Nominal Thread Size Fine Pitch (mm) Head Diameter (mm) Head Height (mm) Hexagon Socket Width A/F (mm) Tensile Strength (min, MPa)
M4 0.50 7.00 4.00 3.00 1,220 (12.9)
M6 0.75 10.00 6.00 5.00 1,220 (12.9)
M8 1.00 13.00 8.00 6.00 1,220 (12.9)
M10 1.25 16.00 10.00 8.00 1,220 (12.9)
M12 1.50 18.00 12.00 10.00 1,220 (12.9)
M16 1.50 24.00 16.00 14.00 1,220 (12.9)
M20 2.00 30.00 20.00 17.00 1,220 (12.9)

Surface Treatment & Material Options

Material / Grade Common Finish Corrosion Resistance Typical Hardness (HRC)
Alloy Steel 12.9 Black Oxide, Zinc-Nickel Moderate 39 – 44
Alloy Steel 10.9 Plain, Zinc Plated Fair 32 – 39
Stainless Steel A2-70 Passivated, Bright Good (general atmosphere) — (tensile ≥ 700 MPa)
Stainless Steel A4-80 Passivated, Bright Excellent (marine & chemical) — (tensile ≥ 800 MPa)

Stock lengths range from 6 mm to 200 mm in all diameters, with custom threading lengths and dog-point configurations obtainable through our workshop on demand. Each package carries heat lot identification and a certificate of conformance, simplifying incoming quality checks for ISO 9001-certified production lines.

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