Spi 29-738-2 Class Zz Plus Plug Gage 0.738 in Steel

Product Description

The SPI 29-738-2 is a Class ZZ Plus plug gage designed to verify bore and hole diameters with high-confidence go/no-go inspection. Built from steel, this fixed-limit gage checks a nominal diameter of 0.738 inches to a tolerance of 0.0002 inches, making it appropriate for production floor inspection and incoming quality checks. Class ZZ Plus gages are manufactured to tighter tolerances than standard Class ZZ, supporting more exacting dimensional verification in machining and fabrication environments. Machinists, toolroom technicians, and quality control inspectors use plug gages as a fast, reliable method of confirming hole size without variable measuring instruments.

This gage is suited for use in machine shops, job shops, and manufacturing facilities where hole diameter verification is part of routine production inspection. It applies to drilled, reamed, or bored holes where a nominal 0.738-inch diameter must be confirmed within close tolerance. The 29-738-2 is a single-size plug gage intended for benchtop or in-process use alongside standard gage holding handles or gage blocks as required by the inspection procedure.

Key Features

• 0.738-inch nominal measurement diameter for precise hole inspection
• 0.0002-inch tolerance for Class ZZ Plus accuracy grade
• Steel construction for durability and wear resistance in production environments
• Fixed-limit go/no-go design enables fast pass/fail inspection without variable readout
• Lightweight at 0.2 pounds for easy handling during inspection tasks

Compatibility

Designed as an OEM-style fixed-limit plug gage for use with standard gage handles compatible with 0.738-inch diameter plug gage members in machining and quality control applications.

Installation Notes

Plug gages should be handled with clean cotton gloves or a lint-free cloth to prevent thermal expansion from hand contact, which can affect measurement accuracy. Store gages in a protective case away from chips, coolant, and abrasive materials when not in use. Calibration against a traceable standard is recommended at regular intervals per your facility quality plan. No power tools or torque requirements apply to plug gage inspection procedures.