Screws & Bolts


A4 steel
very low magnetic activity, chemically resistant, fairly costly
→ preferred material for screws in the experiment
Zinc plated mild steel
cheap, strong ferromagnetism, screws tend to stick exsessively in aluminium threading after a few weeks
→ avoid close to atom experiments and in aluminium
Polyamid (PA)
electrical insulator, thermal insulator, mechanically weak - in particular smallish sizes (M4 and below), tends to give over time
→ not recommended. Better solutions involve polymer washers and/or ceramics

Torx (TX)

Key sizes according to ISO 14583:

M2 M2.5 M3 M4 M5 M6 M8 M10
TX6 TX8 TX10 TX15 TX25 TX30 TX45 TX50


Phillips (PH)

Pozidriv (PZ)