81 pc GRADE AS-2 (B) Gage Block Set USA N.I.S.T. CERTIFIED

Each set comes with a certificate of calibration traceable to NIST and each gage block is etched with a unique serial number. The certificate was issued by the factory at the time of manufacture. Each block is steel and hardened to 65RC, stress relieved, lapped to accurate size, parallelism & flatness, then carefully inspected and marked for size designed to meet close tolerance.

Features:

• Close Tolerance
• Each block is marked with a serial number matching the included NIST certificate
• Grade AS-2 (B) tolerance = ±0.0001"
• 81 Pieces
• Hardened to 65RC
• Included:
  • 9 blocks 0.1001 thru 0.1009 in step of 0.0001 in
  • 49 blocks 0.101 thru 0.149 in step of 0.001 in
  • 19 blocks 0.050 thru 0.950 in step of 0.050 in
  • 4 blocks 1.000 thru 4.000 in step of 1.000
  • Wood Case