| Type |
Plug Gauge, Ring Gauge, Snap Gauge |
| Material |
High-speed steel (HSS), Tool Steel, Carbide |
| Size Range |
From 0.5 mm to 300 mm (depending on type) |
| Tolerance Class |
GO and NO-GO according to ISO, DIN, ANSI, etc. |
| Gauge Class |
Class X, Y, Z or Grade 0, 1, 2 (as per standard) |
| Surface Finish |
Lapped or polished (typically ≤ 0.2 μm Ra) |
| Hardness |
58–62 HRC (Steel), up to 70 HRC (Carbide) |
| Handle Material |
Steel or Aluminum with insulation grip |
| Markings |
Size, GO/NO-GO, Tolerance, Serial No., Standard |
| Type of Fit Checked |
Clearance, Transition, Interference |
| Length |
Varies by type and size (short for plugs, larger for rings) |
