Suppliers of Security screws and nuts, tamperproof, shear nuts
Fastenright Ltd
Countersunk Seal Screws by Fastenright
Brighton-Best Flat Socket Cap Screws - 1/2-13 - Alloy / PLAIN
Slotted Capstan Captive Screws
High Corrosion Resistant Hex Head Screw (DIN 933)
Security Captive Screws
6 Lobe TX Pan Machine Screws
Low Profile Socket Sex Bolts by Fastenright
FastenMaster - #8 x 1-1/4 Wood Screw-1000/Box
Security 2-Hole Countersunk Head Captive Screws
Sex bolt - Wikipedia