Precise Rectangular Gage Block Sets

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.

• Each set includes standard sizes found in more expensive sets. Each block individually serialized and conforms to the rigid standards of the National Bureau Of Standards.
• Grade AS-2 (B) tolerance = .000050″.
• Grade 0 (2) tolerances = 4, -2 millionths.
• Grade AS-1 (3) tolerances = +8, -4 millionths.

Product # 100-811, CGB-200 and CGB-300 comes with NIST Certificate.