Knurled Screw Heads for Hex Bolts (M3–M12)

This set includes knurled screw heads designed to fit hex bolts according to ISO 4017. The bolt length can be freely chosen, giving you maximum flexibility for your projects. The design also accommodates matching washers according to ISO 7089 for a perfect fit.
For extra security, the bolts can be glued into the knurled heads to prevent loosening during use.

Features:

• Fits metric bolts M3 to M12

• Compatible with ISO 4017 (hex bolts)

• Designed for ISO 7089 washers

• Bolt length can be customized

• Bolts can be glued for permanent fixing

• Ergonomic knurling for tool-free operation

• Ideal for mechanical engineering, prototypes, DIY, and 3D printing projects

Printing Recommendations:

• Material: PLA, PETG, or ABS

• 100% infill for maximum strength

• Layer height: 0.2 mm

Note:
This set includes STL files for the knurled heads only – bolts and washers are not included.

👉 For more information and additional projects:
https://emkatech.ch/en/