Spi 29-396-9 Class Zz Plus Plug Gage 0.396 in

Product Description

The SPI 29-396-9 is a Class ZZ Plus plug gage designed for checking the inside diameter of holes to a nominal size of 0.396 inches. Built from steel, it delivers a tolerance of 0.0002 inches, meeting the dimensional verification requirements typical of precision machining and inspection environments. Class ZZ Plus is a widely recognized tolerance class for plain plug gages used in go/no-go inspection workflows. Machinists, quality control technicians, and tool room personnel use this gage to verify bore conformance during production and incoming inspection.

This plug gage is suited for inspection of precision-machined components where tight hole tolerances must be confirmed before assembly. It fits standard hand-held inspection use and is appropriate for both floor-level production checks and formal inspection bench setups. The 0.396-inch nominal diameter targets a specific bore size common in mechanical component manufacturing. At 0.2 pounds, it is lightweight and easy to handle during repetitive measurement tasks.

Key Features

• Nominal measurement diameter of 0.396 inches for precise bore verification
• Class ZZ Plus tolerance rating at 0.0002 inches for dimensional accuracy
• Steel construction for durability and resistance to wear during repeated use
• Lightweight at 0.2 pounds for comfortable single-hand operation
• Suitable for go/no-go inspection procedures in production and QC environments

Compatibility

Designed as an OEM-style replacement or equivalent plug gage for use in any standard plain plug gage application requiring a 0.396-inch nominal bore diameter and Class ZZ Plus tolerance classification.

Installation Notes

Plug gages are handled and used by quality control technicians and machinists; no installation in a mechanical system is required. Before use, clean the gage and the bore being checked to remove chips, coolant, and debris that could affect measurement accuracy. Do not force the gage into the bore, as this can damage the gage surface and compromise future readings. Store the gage in its protective case when not in use to prevent wear and corrosion.