Tension springs with following loops: English, German, swivelling, double loop, tangential loops, in round wire, in square or rectangular section; diameter from 0,07 mm to 20,00 mm.
Tension spring – reference standard
UNI 7900-1:1978
UNI 7900-6:1980
UNI 7900-7:1981
UNI 8526:1984
UNI EN 13906-2 :2003
Tension spring – raw material used
Carbon steel wire norm EN 10270-1 in addition for SM, SH, DH
Carbon steel wire norm EN 10270-1 in addition for SM, SH, DH pre-galvanized, Alumar® e Bezinal®
Steel wire pre-temperate norm EN 10270-2FD, TD, VD Cr-Si
Inox steel wire norm EN 10270-3 and type 1.4301, 1.4539 according to EN 10088-3 type 1.4310, 1.4310 HS, 1.4568, 1.4404.
Copper alloy: norm EN 12166 brass and bronze phosphor.
Production line batch
Small amount: ten of pieces
Large amount: millions of pieces
Treatments
Epoxide coating
Cataphorised coating
Zintek® coat
Geomet 320®
White and yellow trivalent galvanization (free from Cr VI)
Phosphated, Passivation, Nickel, Chrome platings, Thick chrome, Hard chrome, Chemical nickel, gold, silver, brass, copper and Shot peeninig.
