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Black 12.9 alloy steel grub screws, M4 x 3 mm, hex socket cup point, 100 pieces

Unique-Bargains

Unique-Bargains M4 x 3 mm 0.75 mm Pitch Hex Socket Set Cap Point Grub Screws 100 pcs

SKU CH-GKG0-3QSJQ

M4 grub screws with 0.75 mm pitch and cup point for locking pulleys or gears to shafts, 100 pieces of 12.9 alloy steel

  • 100-piece bulk pack covers multiple installations
  • 9 alloy steel delivers high tensile strength
  • Cup point design secures pulleys and gears firmly
  • 2 mm hex drive allows quick tool engagement
  • 18 g total weight keeps assemblies lightweight

M4 grub screws for shaft retention

These M4 grub screws feature a cup point and hex socket drive, supplied in a pack of approximately one hundred pieces. They are made from 12.9 alloy steel with a black finish and suit applications where a pulley, gear or similar component must be locked to a shaft.

Thread pitch and drive size limits

The thread pitch is 0.75 mm, so the screws only match M4 tapped holes cut to that pitch. The hex socket measures 2 mm across flats, requiring the correct key for installation and removal. The thread length is 3 mm, which restricts the maximum engagement depth in the mating hole.

Straightforward hex-key fitting

Installation is a simple hex-key operation; the cup point seats against the shaft to resist rotation. The short 3 mm thread length means the tapped hole must be deep enough for full engagement, otherwise the grip will be reduced. Over-tightening a 12.9 alloy screw in a softer material can strip the threads.

How it compares

Measured against everything we stock in Hose Fittings, Adapters & Clamps, at today’s prices. Recalculated every night.

Price $4.99
Cheaper than about 83% of the 2,955 comparable items (median $17.99).

Specifications

Product
Brand nameUnique Bargains

Questions about this item

Which pack size should I choose for this M4 grub screw?

This listing supplies 100 pieces with a tolerance of +/-2%, giving you approximately 100 screws per pack.

What does the 12.9 alloy steel rating mean when the screw is installed?

12.9 alloy steel provides high tensile strength so the cup point can hold a pulley or gear firmly against a shaft without stripping.

How does the 0.75 mm pitch affect compatibility with tapped holes?

The 0.75 mm fine pitch matches M4 threads cut to that pitch, ensuring proper engagement in precision components.

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