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Material Specifications for NSK Ball Screws

Application Heat
Treating Process
JIS
Material Code
U.S.
Material Code
Surface Hardness
Carbon Steel Ball Screws
All B/S Nuts
Carburizing

SCM 415H/SCM 420H

SAE 4115/4120

RC 58-62

Custom B/S Shafts
Induction/
Carburizing
SCM 415H/SCM 420H
SAE 4150

SAE 4115/4120

RC 58-62

Std. Series B/S Shafts Induction

SAE 4150

SAE 4150

RC 58-62

F/R Produced Shafts Induction SAE 4150 SAE 4150 RC 58-62
Rolling Elements (Balls) Thru Hardened

SUJ2

52100

RC 60-64

Stainless Ball Screws Custom & Std. Series (K/A)
Stainless B/S Nuts

Furnace/ Quench

SUS 440C SAE 440C RC 55-60
Stainless B/S Shafts

Induction

SUS 440C SAE 440C RC 55-60
Rolling Elements for Stainless Screws

Thru Hardened

SUS 440C SAE 440C

RC 58-62

 

Abbreviations

  • JIS Japanese Industrial
  • Standards
  • SAE - Society of Automotive Engineers

Material Descriptions

  • SCM415H, 420H (SAE4115): Low carbon chrome molybdenum steel used for carburizing heat treat process.
  • SUJ2 (52100): Bearing steel features high hardness, toughness and resilience.
  • SUS440C (SAE440C): Martensitic stainless (hardenable). Has the high hardness that anti-friction bearing applications require, but less corrosion resistance than austenitic stainless steels (300 Series).
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