To order a pin gage (plain cylindrical plug gage) from Vermont Gage, specifying a tolerance class (such as XX, X, Y, Z, or ZZ) is generally required, as it determines the manufacturing precision of the gage itself
—tighter classes like XX are for high-precision masters, while ZZ is common for economical working gages. Stocked items default to Class ZZ for many sizes, but if you need a different class (e.g., X for calibration masters or custom tolerances), you must explicitly include it in your order to avoid defaults or delays. These classes follow ASME B1.7M standards, with ZZ offering ±0.0002" tolerance in inch sizes (or ±0.005mm metric).
For ordering a working pin gage specifically (e.g., reversible, taperlock, or trilock styles), Vermont Gage typically requires the following key specifications, based on their catalog and ordering process:
Nominal Size: This is the exact diameter of the gage, such as "0.250"" (inch) or "6.35mm" (metric). This is always required and defines the gage's measurement range. Sizes range from 0.0040" to over 6" depending on style.
Tolerance Class: Choose from XX (tightest, ±0.00002"), X (±0.00004"), Y (±0.00007"), Z (±0.0001"), or ZZ (±0.0002"). ZZ is standard for stocked working gages; others may be custom.
Direction of Tolerance: Specify Plus (for Go/master plugs, oversized) or Minus (for No-Go plugs, undersized). This is essential for Go/No-Go inspection.
Additional optional details for a complete order include:
Gage style (e.g., reversible for small sizes and extended life, taperlock for medium and quick swaps, trilock for large and stability).
Go, No-Go, or Go/No-Go assembly.
Material (e.g., tool steel is standard; chrome-plated, Black Guard anti-corrosion, or carbide available for durability).
Handle type (e.g., single-end or double-end aluminum) and custom markings (up to 25 characters free, such as part numbers).
Any special features (e.g., long lengths up to 12", depth steps, or NIST-traceable long-form certification).
The order nomenclature typically follows a format like "[Nominal Size] [Tolerance Class] [Direction] Pin Gage", e.g., "0.250 ZZ Plus Pin Gage". For sets, it might be "0.061-0.250 ZZ Plus Pin Gage Set". Stocked gages are marked with the size, class, direction, and serial number. All gages are NIST-traceable with short-form certification included; long-form available for an extra fee.