Standard Jaw Self Centring Chucks, Type SJ

Standard Jaw Self Centring Chucks, Type SJ


Scroll operated self-centring chuck with 2 sets of jaws (reverse and forward) is widely used in mass production. Material composition:

  • Body – CI body, high tensile, wear resistant cast iron alloyed with chrome and manganese, hardness 180-210 BHn
  • SG iron body – 500/7 grade of SG iron, hardness 180-210 BHn
  • Steel body – medium carbon steel of 600 mpa tensile strength
  • Jaws – case hardening steel with tough care, hardness 56-60 HRc
  • Pinion – case hardening nickel chrome alloy steel hardness 42-50 HRc
  • Scroll – forged high strength wear resistant case hardening alloy steel, hardness 40-45 HRc.

Manufactured by State Engineering Corporation, this chuck features several innovations:

  • Body: Knob and jaw ways hardened and ground
  • Jaw teeth precision ground from both sides
  • Scroll threads precision ground from both sides
  • Hardness 40-45 HRc
  • Parts: Interchangeable
  • Runout: Less than 0.04 from 160 mm onwards

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