Spi 29-101-3 Class Zz Plus Plug Gage 0.101 in Steel

Product Description

The SPI 29-101-3 is a Class ZZ Plus plug gage designed for go/no-go inspection of drilled, reamed, or bored holes at a nominal diameter of 0.101 inches. Built from steel, this gage checks whether a hole falls within acceptable tolerance limits, making it a standard tool in quality control and machining inspection workflows. The ZZ tolerance class is suited for general-purpose inspection where tighter Class Z or ZZ gages are required, and the Plus designation indicates the gage is manufactured to the upper end of the tolerance range. Technicians and quality inspectors use this gage to verify part conformance quickly and without complex measurement equipment.

This plug gage is used in machine shops, manufacturing facilities, and precision fabrication environments where hole diameter verification is part of a standard inspection process. It is well suited for inspecting small-diameter holes in metal components where consistent dimensional accuracy is required. Typical applications include incoming inspection, in-process quality checks, and final part verification across a range of industries including aerospace, automotive, and general metalworking.

Key Features

• Nominal measurement diameter of 0.101 inches for precise small-hole inspection
• Tolerance of 0.0002 inches for high-accuracy go/no-go verification
• Class ZZ Plus classification suitable for general-purpose precision inspection
• Steel construction for durability and dimensional stability under regular use
• Compact, single-piece design for fast and repeatable checks on the shop floor

Compatibility

Designed as an OEM-style replacement or direct-use plug gage for any inspection application requiring a 0.101-inch diameter Class ZZ Plus go/no-go check in standard shop or quality-lab environments.

Installation Notes

Plug gages are handled and used by machinists, quality control technicians, and inspection personnel. Keep the gage clean and lightly oiled when not in use to prevent corrosion and wear. Never force the gage into a hole; a proper-sized hole will accept the go end with light hand pressure only. Store in a protective case away from other tooling to avoid nicks or burrs that could affect measurement accuracy.