M2–M8 Black Grade 12.9 Steel Allen Hex Socket Flat Point Set Screw Grub Bolt

M2–M8 Black Grade 12.9 Steel Allen Hex Socket Flat Point Set Screw Grub Bolt

DIN913 black grade 12.9 steel hex socket flat point set screws for shaft locking applications where the shaft surface must be preserved. The flat point distributes clamping load without indenting the shaft, making these ideal for hardened shafts, precision ground shafts, and applications requiring shaft removal and reinstallation without surface damage.

Key Specifications

Why Choose Flat Point Set Screws?

• Flat point tip — no shaft indentation; shaft can be removed and reinstalled without surface damage
• Grade 12.9 strength — 1220 MPa tensile strength for high-torque locking applications
• Black oxide finish — professional appearance; light corrosion resistance
• Hex socket drive — high torque with standard Allen keys; no cam-out
• DIN913 standard — interchangeable with ISO 4026

Typical Applications

• Precision ground shaft locking (where cup point would damage surface)
• Hardened shaft collar and hub retention
• Optical mount and precision instrument adjustment locking
• Rotary encoder shaft locking (preserves shaft for encoder removal)
• CNC machine tool holder locking
• Adjustable stop and limit screw applications

Compatible With

Standard metric tapped holes M2–M8. Allen key sizes: M2=0.9mm, M3=1.5mm, M4=2mm, M5=2.5mm, M6=3mm, M8=4mm.

FAQ

Q: When should I use flat point instead of cup point?
A: Use flat point when the shaft surface must be preserved — for example, on precision ground shafts, hardened shafts, or when the shaft needs to be removed and reinstalled repeatedly. Use cup point for maximum holding force where shaft marking is acceptable.

Package Contents

• DIN913 black grade 12.9 steel flat point set screws (quantity and size per selected variant)