Spi 29-511-3 Class Zz Plus Plug Gage 0.511 in Steel

Product Description

The SPI 29-511-3 is a Class ZZ Plus plug gage machined to a nominal diameter of 0.511 inches with a tolerance of 0.0002 inches. Plug gages in this class are go/no-go inspection tools used to verify bore diameters fall within specified limits. The steel construction provides dimensional stability under typical shop conditions. Machinists, quality control technicians, and precision fabricators use this gage to confirm hole sizes during in-process and final inspection on machined parts. The tight tolerance rating makes it appropriate for general-purpose production gauging where Class ZZ specifications are called out on inspection plans.

This gage is suited for dimensional inspection in machine shops, manufacturing cells, and quality labs. It is used on drilled, reamed, or bored holes where a 0.511-inch diameter is the target condition. The Class ZZ Plus designation indicates a plus-tolerance ground gage, which is typically used as the go member in a go/no-go gage set or as a standalone bore verification tool. Applications span general metalworking, toolroom inspection, and production floor quality checks.

Key Features

• Nominal measurement diameter of 0.511 inches for precise bore inspection
• Class ZZ Plus tolerance of 0.0002 inches for general-purpose production gauging
• Steel construction for durability and dimensional stability in shop environments
• Single-piece gage format suitable for go/no-go inspection routines
• Lightweight at 0.2 pounds for easy one-hand use during inspection

Compatibility

Designed as an OEM-style replacement or standard addition to go/no-go gage sets requiring a Class ZZ Plus plug gage at 0.511 inches nominal diameter. Confirm drawing callouts and gage tolerancing standards before substituting in calibrated inspection systems.

Installation Notes

Plug gages are handled and used by quality technicians and machinists following standard metrology practices. Store the gage in a clean, dry environment away from abrasive materials to preserve the ground surface finish. Clean mating bores before gauging to prevent premature wear on the gage diameter. Periodic recalibration against certified gage blocks or master rings is recommended to maintain measurement traceability per applicable inspection standards.