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Lead Screw and Nut Materials & Dimensions


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.


  • H1= 0,5 P
  • h3= H4 = H1 + ac = 0.5 P + ac
  • z = 0,25 P = H1/2
  • d3= d – 2 h3
  • d2= D2 = d – 2 z = d – 0.5 P
  • D2= d + 2 ac
  • ac= bottom play
  • es= top deviation for screw
  • s= 0,26795 es
  • R1 max.= 0.5 ac
  • R2 max.= ac

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