Which set screw point type should I use for shaft locking?

For most shaft locking applications, use the knurled cup point. The HRc 45+ hardened knurled tip bites into the shaft surface, creating a permanent impression that resists both rotation and axial movement. Where shaft damage is unacceptable, use a flat point with a shaft flat. For permanent locking, cone points provide the highest holding power.

Are Unbrako set screws available in Noida?

Yes. Shri Narayan Machinery LLP in Sector 9, Noida stocks Unbrako socket set screws in all standard metric sizes and point styles. Call +91-9811104037 for availability and technical guidance.

Unbrako

Socket Set Screws (Grub Screws): Unbrako Knurled Cup Point

Name: Socket Set Screws (Grub Screws): Unbrako Knurled Cup Point
Brand: Unbrako

Grub screw or set screw, same fastener, and Unbrako's version grips harder: the knurled cup point is hardened to HRc 45 minimum so it bites a permanent impression into the shaft, holding pulleys, gears, collars, and coupling hubs against rotation and axial creep. Headless full-body threads sit flush or below the surface, driven by an Allen key from the end face. Sizes run M3 to M20 in five point styles: knurled cup (DIN 916), flat (DIN 913) where you can't mark the shaft, cone (DIN 914) for permanent locking, plus dog and half-dog for positioning. High-carbon alloy steel, black oxide, heat treated for consistent clamping. Machine builders and packaging machinery plants across Noida-NCR order these by the box. Stocked at Sector 9, Noida; WhatsApp for price.

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Surface Hardness (Cup Point): HRc 45 minimumCore Hardness: HRc 43-53Material: High-Carbon Alloy Steel, Heat TreatedFinish: Black Oxide

Key Features

Knurled cup point, HRc 45 minimum hardness for aggressive bite into mating surface

Headless design sits flush or below the surface, no external protrusion

Full-body hexagon socket for wrench access from the end face

Five point styles: knurled cup, flat, cone, dog, and half-dog

High-carbon alloy steel with controlled heat treatment

Consistent clamping force, holds components against rotation and axial movement

E-Code traceability on packaging for lot identification

Black oxide finish as standard

Technical Specifications

Surface Hardness (Cup Point)	HRc 45 minimum
Core Hardness	HRc 43-53
Material	High-Carbon Alloy Steel, Heat Treated
Finish	Black Oxide
Head Type	Headless (full body thread)
Drive Type	Hexagon socket (Allen key)
Point Styles	Knurled Cup, Flat, Cone, Dog, Half-Dog
Thread Class	6g (metric)
Size Range	M3, M4, M5, M6, M8, M10, M12, M14, M16, M18, M20

Applications

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

Shaft collars, locking position on shafts without keyways
Pulleys and gears, securing hubs to shafts as primary or secondary locking
Couplings, preventing relative rotation between coupling halves and shaft
Guide pins and locators, adjustable-length positioning elements in jigs
Bearing retention, axial locking of bearing inner races on shafts
Handle and knob attachment, concealed fastening without visible heads
Motor shaft locking, securing encoders, fans, and coupling hubs
Tool holders, clamping cutting tools in lathe turrets and milling spindles

Industries Served

Machine Tool ManufacturingPower TransmissionAutomotive & Auto ComponentsPackaging MachineryTextile MachineryGeneral Engineering

Need Socket Set Screws? Get the Best Dealer Price

As your Unbrako dealer, Shri Narayan Machinery LLP offers competitive pricing on the full Socket Set 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: Socket Set Screws

There is no difference — 'grub screw' and 'set screw' are the same fastener. 'Grub screw' is the common term used in India and the UK; 'set screw' is the American engineering term. Both refer to a headless screw with a hexagon socket drive, built to clamp components against a shaft or within a bore.

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