Materials

Steel used for Trapezoidal Lead Screws

Lead Screw type KUE
C45 – 1.0503 Carbon Steel – Surface hardness after rolling approx. 250 HB

Lead Screw type KAF
AISI 316 (Inox A4) – 1.4401 Stainless Steel – Surface hardness after rolling approx. 280 HB

Steel used in Nuts

Nut types MLF, MZP, MES
EN 10277-3 11SMnPb37 – 1.0737 Steel with Sulphur, Manganese and Lead

Bronze used in Nuts

Nut Types HSN,FFR
EN 1982 CuSn 5Zn 5Pb5-C – CC491K Bronze with Zinc and Lead 60-70 HB

Nut types HBD
EN 1982 CuSn7Zn4Pb7-C – CC493K Bronze with Zinc and Lead 65-75 HB

C45 and AISI 316 were chosen because, in addition to their natural qualities as good construction materials, after rolling they give a very good surface hardness and finish on the thread sides.

These two features are decisive factors for qualitative appraisal of Trapezoidal Lead Screws, because they give very small friction coefficients; much lower than those obtainable with machined screws, where other conditions such as speed, load and lubrication are equal. Nut life is therefore also increased.