Hexagon Socket Head Set (grub) Screws, Alloy (grade 12.9)ISO 4029DIN 916 (cup Point)m12x55 MM

Overview

DIN 916 defines a hexagon socket set screw, commonly called a cup point grub screw. The headless design allows the screw to sit inside or flush with the component, while the cup point bites into the mating shaft or surface to resist movement.

This selected size is specified with diameter M12, length 55 mm, thread M12, pitch 1.75 mm.

Sold in multiples of '25 pieces. 1 Box = '25 pieces.

Material, Grade & Strength

Grade 12.9 is a very high strength alloy steel property class with a nominal ultimate tensile strength of about 1200 MPa and yield strength of about 1080 MPa. It is used where maximum clamp load is needed and should be installed with correctly rated mating components and controlled tightening practice.

Finish & Corrosion Protection

Plain finish fasteners have no protective plated coating and are best used indoors, in oiled assemblies, in painted structures or where corrosion exposure is controlled.

Typical Uses

DIN 916 cup point grub screws are used for collars, pulleys, gears, handles, knobs, hubs, shaft-mounted components and mechanical adjustments where a protruding head is not required.

Technical Tips

• The cup point can mark the shaft or mating surface, which is useful for grip but may not suit delicate components.
• Use the correct hex key size to prevent rounding the socket.
• Apply threadlocker where vibration is present.
• For repeated adjustments, consider whether the point style is suitable for the shaft material.

Frequently Asked Questions

What does the cup point do? The cup point digs slightly into the mating surface to improve grip and resist rotation or sliding.