Spi 29-148-4 Class Zz Plus Plug Gage 0.148 in Dia

Product Description

The SPI 29-148-4 is a Class ZZ Plus plug gage designed to verify bore and hole diameters at a nominal size of 0.148 inches. It is manufactured from steel and holds a tolerance of 0.0002 inches, providing the precision required for go/no-go inspection work in production and quality-control environments. This gage is used by machinists, tool-and-die technicians, and quality inspectors to confirm dimensional conformance on drilled, reamed, or bored features. The Class ZZ Plus classification designates it as a working gage suitable for checking tolerance-critical parts in standard shop-floor inspection routines.

This plug gage is appropriate for use in machine shops, manufacturing facilities, and toolrooms where small-diameter bore verification is part of the inspection process. It is suited to both production-line go/no-go checks and incoming inspection of machined components. The 0.148-inch nominal diameter makes it a practical tool for verifying holes produced by standard drill or reamer operations in that size range.

Key Features

• Nominal diameter of 0.148 inches for precise small-bore inspection
• Tolerance of 0.0002 inches meeting Class ZZ Plus accuracy standards
• Steel construction for durability and dimensional stability under repeated use
• Compact form factor suited to hand-held go/no-go inspection routines
• Single-unit packaging for direct bench or kit deployment

Compatibility

Designed as a working plug gage for go/no-go inspection of bores and holes with a nominal diameter of 0.148 inches in standard machined components.

Installation Notes

Plug gages are handled and used by machinists and quality-control inspectors — no power source or mechanical installation is required. Keep the gage clean and lightly oiled when not in use to prevent corrosion and preserve accuracy. Do not force the gage into a bore; controlled hand pressure only is appropriate to avoid scoring the gage or the workpiece. Store in a protective case away from heat sources to maintain dimensional stability.