Spi 19-437-3 Class Zz Minus Plug Pin Gage 0.437 in

Product Description

The SPI 19-437-3 is a Class ZZ minus plug pin gage machined from steel, designed for go/no-go dimensional inspection of bored holes, drilled passages, and machined features. At 0.437 inches in diameter with a minus tolerance of 0.000200 inches, this gage allows machinists and quality technicians to verify that a hole meets its minimum acceptance threshold. Class ZZ designates this as a working-grade gage suitable for production floor inspection rather than laboratory-grade metrology. The steel construction provides durability under repeated use in shop environments.

Plug pin gages in this size range are used across general machining, fabrication, and assembly inspection workflows. The 0.437-inch diameter corresponds to a common drilled or reamed hole size encountered in mechanical components, fixtures, and tooling. This gage is appropriate for incoming inspection, in-process quality checks, and final part verification wherever hole diameter conformance must be confirmed quickly and reliably without CMM measurement.

Key Features

• Class ZZ working-grade tolerance for production floor go/no-go inspection
• Minus tolerance of 0.000200 inches for checking minimum hole size acceptance
• 0.437-inch nominal diameter suits common drilled and reamed hole sizes
• Steel construction for shop-floor durability and dimensional stability
• Single-piece pin format for straightforward manual insertion checks

Compatibility

Designed as a working-grade plug pin gage for inspection of 0.437-inch nominal diameter holes in machined parts, fixtures, and fabricated assemblies across general manufacturing and quality control applications.

Installation Notes

Plug pin gages are used by machinists and quality control technicians and require no installation in the traditional sense. Before use, clean both the gage and the workpiece hole to remove chips, coolant, and debris that could cause false readings. Handle the gage carefully to avoid nicks or corrosion that could compromise dimensional accuracy. Store the gage in its protective case away from impact and temperature extremes to maintain calibration integrity.