+91-9811104037
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

Unbrako Countersunk Socket Cap Screws (CSK) provide a flush-mounted fastening solution for applications where a smooth, snag-free surface is essential. Available in metric sizes M3 through M24 with Property Class 012.9, these screws deliver 160,000 PSI minimum tensile strength while sitting completely flush with the work surface. The 90-degree countersunk head seats into a matching countersink, leaving no protrusion — critical for machine guards, cover plates, sliding surfaces, and aerodynamic assemblies. Manufactured from alloy steel with Unbrako's proprietary heat treatment, each screw benefits from the same Compound Fillet Radius, controlled thread runout, and E-Code traceability that define the Unbrako quality standard. The hexagon socket drive permits high torque application in recessed or confined spaces where hex head bolts cannot reach. Shri Narayan Machinery LLP supplies the full Unbrako CSK range in Noida for precision engineering and manufacturing applications.

Request QuoteCall +91-9811104037
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 entire Countersunk Socket Screws range. Contact us for availability and your best quote.

Request Quote on WhatsAppCall +91-9811104037

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.

Need This Product? Get a Quote Now.

Call or WhatsApp us with the model number — we'll check availability and give you the best price. Bulk orders welcome.

Call +91-9811104037WhatsApp Us