Class B Stressproof A311 Turned Ground and Polished Steel Bar
Chemical Composition
Carbon:                0.40%-0.48%
Manganese:          1.35%-1.65%
Phosphorus:          0.040% Max
Sulphur:               0.24%-0.33%
Silicon:                0.15%-0.35%
Tensile Strength: 115,000 psi (Min)
Yield Strength:    100,000 psi (Min)
Elongation:         8% (7% Min above 3 in)
Typical Uses
  • Arbors
  • Keyed Shafts
  • Motor Shafts
  • Splined Shafts
  • Drive-Shafts
  • Armature Shafts
  • Gears
  • Sleeves
  • Lead Screws
  • Link Pins
  • Collets
  • Bushings
  • Boring Bars

A311 Class B Stressproof® Turned Ground and Polished Steel Round Bar

A311 Class B StressProof® TG&P is steel produced using a proprietary process that draws the bar through a special die under heavy draft. It is then stress relieved in a precisely controlled furnace.  Alro offers StressProof® round bar in standard cold-finished or TG&P (Turned, Ground and Polished). The result is a steel bar product that meets stringent standards and provides a wide variety of benefits, including:
  • Improved wearability without case hardening
  • Strength without heat treating
  • Exceptional surface quality
  • Excellent machinability
  • Extended tool life
  • Resistance to fatigue and stress
  • Balanced working
  • Minimized warpage and distortion
  • Controlled low stresses
Alro also stocks:
A311 Class B StressProof® 

StressProof® is electro-magnetically tested using eddy currents. Although it also can be induction hardened, it should be watched for quench cracks.

StressProof® is a trademark of the LaSalle Steel Corporation.