Spi 29-935-4 Class Zz Plus Plug Gage 0.935 in

Product Description

The SPI 29-935-4 is a Class ZZ Plus plug gage designed for go/no-go dimensional inspection of bored holes, drilled passages, and machined bores. It measures a nominal diameter of 0.935 inches with a tolerance of 0.0002 inches, making it suitable for precision verification work in manufacturing, machining, and quality-control environments. The gage is constructed from steel for dimensional stability under shop conditions. Machinists, quality technicians, and tool-and-die professionals use this type of gage to confirm that a feature falls within specified limits without the need for calibrated measuring instruments at the point of inspection.

This plug gage is used in production and inspection environments where hole diameter conformance must be verified quickly and repeatedly. Typical applications include checking drilled, reamed, or bored holes in metal, plastic, and composite workpieces. Class ZZ Plus gages are a common choice for in-process inspection on the shop floor as well as final dimensional acceptance checks in quality labs.

Key Features

• 0.935 inch nominal diameter for precise hole inspection
• 0.0002 inch tolerance meets Class ZZ Plus gage-maker standards
• Steel construction provides dimensional stability in shop environments
• Compact form factor weighing 0.2 pounds for handheld use
• Single-piece package ready for immediate use upon receipt

Compatibility

Designed as an OEM-style replacement or direct-use plug gage for any application requiring a 0.935 inch diameter Class ZZ Plus go/no-go inspection gage.

Installation Notes

Plug gages are handled and used by machinists and quality-inspection personnel — no power tools or electrical shutoff is required. Store the gage in a protective case away from abrasive surfaces and temperature extremes to preserve dimensional accuracy. Clean the gage and the bore being checked before use to prevent debris from affecting the measurement result. Periodic recalibration against certified reference standards is recommended to maintain traceability.