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Countersunk Socket Cap Screws (CSK): Unbrako DIN 7991 / ISO 10642 | Unbrako pneumatic product available at Shri Narayan Machinery LLP Noida
Unbrako

Countersunk Socket Cap Screws (CSK): Unbrako DIN 7991 / ISO 10642

Flush means flush: Unbrako countersunk socket cap screws seat their 90-degree heads level with the surface, so machine guards, guide rails, and sliding surfaces have nothing to snag. Property Class 012.9 gives 160,000 PSI (1,100 N/mm²) minimum tensile strength in alloy steel with black oxide finish, across M3 to M24 in full-thread (M3-M12) and partial-thread (M6-M24) versions, made to DIN 7991 / ISO 10642. The same Compound Fillet Radius and controlled thread runout as the flagship SHCS carry over, plus E-Code batch traceability. One design note: the countersunk head bears on less area than a cap screw head, so for heavy shear, add dowel pins or shoulder screws. Tool rooms and panel builders across Noida-NCR buy these regularly. Stocked at Sector 9, Noida; WhatsApp for price.

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Property Class: 012.9Min. Ultimate Tensile Strength: 160,000 PSI (1,100 N/mm²)Material: Alloy Steel, Quenched & TemperedFinish: Black Oxide (standard)

Key Features

Property Class 012.9, 160,000 PSI minimum tensile strength
90-degree countersunk head sits perfectly flush with the work surface
Hexagon socket drive for high torque application in confined spaces
Alloy steel construction with black oxide finish
Compound Fillet Radius and controlled thread runout for fatigue resistance
E-Code lot markings for full batch traceability
Snag-free surface finish, no protrusion above the mating surface
Available in full thread and partial thread configurations

Technical Specifications

Property Class012.9
Min. Ultimate Tensile Strength160,000 PSI (1,100 N/mm²)
MaterialAlloy Steel, Quenched & Tempered
FinishBlack Oxide (standard)
Head Angle90 degrees
Head TypeFlat countersunk with hexagon socket
Drive TypeHexagon socket (Allen key)
Thread Class6g (metric)
Size RangeM3, M4, M5, M6, M8, M10, M12, M14, M16, M18, M20, M24

Applications

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

  • Machine guards and cover plates, flush surface prevents snagging
  • Sliding surfaces and guide rails, no protrusion interferes with movement
  • Aerospace panels and fairings, aerodynamic smooth surface requirement
  • Die and mould assemblies, flush fastening of cavity inserts and plates
  • Jigs and fixtures, countersunk mounting for workpiece clearance
  • Electronic enclosures, clean appearance with flush-mounted covers
  • Conveyor systems, belt-side fasteners must not protrude
  • Automotive body panels and interior trim assemblies

Industries Served

Aerospace & DefenceAutomotiveMachine Tool ManufacturingDie & MouldElectronics & ElectricalGeneral Engineering

Need Countersunk Socket Screws? Get the Best Dealer Price

As your Unbrako dealer, Shri Narayan Machinery LLP offers competitive pricing on the full Countersunk Socket Screws range. Call us for availability and your best quote.

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

Frequently Asked Questions: Countersunk Socket Screws

Unbrako CSK screws have a standard 90-degree countersunk head angle. The mating hole must be countersunk to match this angle for the head to sit flush with the surface.

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