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Socket Head Cap Screws (SHCS) — Unbrako DIN 912 / ISO 4762 — Unbrako pneumatic product available at Shri Narayan Machinery LLP Noida
Unbrako

Socket Head Cap Screws (SHCS) — Unbrako DIN 912 / ISO 4762

Unbrako Socket Head Cap Screws (SHCS) are the flagship fastener of the world's leading socket screw brand, trusted across 35 countries since 1911. Manufactured from premium alloy steel with black oxide finish, these Property Class 12.9 cap screws deliver 1,300 N/mm² minimum ultimate tensile strength — 10,000 PSI stronger than the industry standard. Available in metric sizes M2 through M56 and inch sizes BSW 1/8" through 1-1/2", Unbrako SHCS feature the patented Compound Fillet Radius that doubles fatigue life and the 3R Radiused Root Runout Thread that increases fatigue resistance by 300% over conventional screws. Every screw carries the patented E-Code lot marking for full batch traceability from raw material to finished product. Shri Narayan Machinery LLP stocks the complete Unbrako SHCS range in Noida for automotive, aerospace, heavy machinery, and general engineering applications across Delhi NCR.

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Property Class: 12.9Min. Ultimate Tensile Strength: 1,300 N/mm² (188,500 PSI)Min. Yield Strength: 1,040 N/mm² (150,800 PSI)Surface Hardness: HRc 38-43

Key Features

Property Class 12.9 — 1,300 N/mm² minimum ultimate tensile strength
Compound Fillet Radius — doubles fatigue life vs. conventional cap screws
3R Radiused Root Runout Thread — 300% fatigue life increase over standard threads
Wide Radius Threads — 100% fatigue life increase over flat root designs
Contour flow forged heads for maximum strength at the head-to-shank junction
Accurate socket depth ensures full wrench engagement without cam-out
Controlled thread runout prevents stress concentration at the thread-body transition
Patented E-Code lot markings — full traceability from raw material to finished product
Black oxide finish on alloy steel — superior corrosion resistance and appearance
Available with special coatings: Hot Dip Galvanizing, Electroplating, PTFE, Zinc-Al Flake (Geomet, Delta Protekt), Unbrako Wiscoat
Metric sizes M2 to M56, Inch sizes BSW 1/8" to 1-1/2"

Technical Specifications

Property Class12.9
Min. Ultimate Tensile Strength1,300 N/mm² (188,500 PSI)
Min. Yield Strength1,040 N/mm² (150,800 PSI)
Surface HardnessHRc 38-43
Core HardnessHRc 39-44
MaterialAlloy Steel (AISI 4037 / equivalent), Quenched & Tempered
FinishBlack Oxide (standard), special coatings on request
Thread Class6g (metric) / 2A (inch)
Head TypeCylindrical with hexagon socket
Drive TypeHexagon socket (Allen key)
Metric Size RangeM2, M2.5, M3, M4, M5, M6, M8, M10, M12, M14, M16, M18, M20, M22, M24, M27, M30, M33, M36, M39, M42, M45, M48, M52, M56
Inch Size RangeBSW 1/8", 5/32", 3/16", 7/32", 1/4", 5/16", 3/8", 7/16", 1/2", 5/8", 3/4", 7/8", 1", 1-1/8", 1-1/4", 1-3/8", 1-1/2"
Wrench Key Sizes (Metric)1.5mm (M2), 2mm (M2.5), 2.5mm (M3), 3mm (M4), 4mm (M5), 5mm (M6), 6mm (M8), 8mm (M10), 10mm (M12), 12mm (M14-M16), 14mm (M18-M20), 17mm (M22-M24), 19mm (M27-M30), 22mm (M33-M36), 24mm (M39-M42), 27mm (M45-M48), 32mm (M52-M56)

Applications

The Socket Head Cap Screws is used across a wide range of industrial applications:

  • Machine tool assemblies — spindle clamping, toolholder retention, fixture bolting
  • Engine and powertrain components — cylinder head bolting, connecting rod fastening
  • Die and mould assemblies — cavity clamping, guide pillar retention, ejector plates
  • Heavy machinery frames — structural joints requiring high preload and fatigue resistance
  • Aerospace components — airframe sub-assemblies, landing gear mechanisms
  • Petrochemical equipment — flange bolting, valve bonnet fastening, pump assemblies
  • Robotics and automation — joint fastening, end-effector mounting, actuator assemblies
  • Defence equipment — weapon systems, armoured vehicle assemblies, naval fittings

Industries Served

Automotive & Auto ComponentsAerospace & DefenceMachine Tool ManufacturingDie & MouldHeavy EngineeringPetrochemical & RefineryRobotics & AutomationGeneral Engineering

Need Socket Head Cap Screws? Get the Best Dealer Price

As your Unbrako dealer, Shri Narayan Machinery LLP offers competitive pricing on the entire Socket Head Cap Screws range. Contact us for availability and your best quote.

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C-101, Sector 9, Noida, Uttar Pradesh 201301 | Unbrako Dealer

Frequently Asked Questions — Socket Head Cap Screws

Unbrako SHCS are manufactured with exclusive design features not found in standard cap screws. The Compound Fillet Radius doubles fatigue life, the 3R Radiused Root Runout Thread increases fatigue resistance by 300%, and Wide Radius Threads add another 100% improvement. Unbrako screws also deliver 10,000 PSI higher minimum ultimate tensile strength than the industry standard, with every batch traceable via patented E-Code markings.

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