Spi 19-976-0 Class Zz Minus Plug Pin Gage 0.976 in

Product Description

The SPI 19-976-0 is a Class ZZ minus plug pin gage machined to a 0.976-inch nominal diameter with a tolerance of 0.0002 inches. Plug pin gages are single-ended or double-ended cylindrical gauging tools used to verify that a drilled, reamed, or bored hole falls within a specified tolerance range. The minus designation means the gage is ground to the lower boundary of the tolerance band, making it a go-gage for confirming minimum acceptable hole size. Manufactured from steel, this gage is a standard inspection tool used in machine shops, manufacturing facilities, and quality-control environments where dimensional verification is required.

Class ZZ gages are the most commonly stocked grade and are suited for general-purpose inspection work where production tolerances allow for the slightly wider gage tolerance that Class ZZ carries versus Class Z or ZZ-minus precision grades. This 0.976-inch diameter gage is appropriate for verifying bored holes, machined bores, and drilled passages in metal or rigid components across light manufacturing, maintenance, and toolroom applications. It is typically used by machinists, quality technicians, and tool-and-die tradespeople performing in-process or final inspection checks.

Key Features

• Class ZZ minus tolerance grade for general-purpose hole inspection
• 0.976-inch nominal diameter for direct hole-size verification
• 0.0002-inch tolerance for precise dimensional gauging
• Steel construction provides durability and wear resistance in shop environments
• Minus designation confirms the gage is ground to the lower boundary of the tolerance band

Compatibility

Designed as an OEM-style replacement or direct-use plug pin gage for general-purpose hole inspection applications requiring a 0.976-inch nominal diameter at Class ZZ minus tolerance.

Installation Notes

Plug pin gages should be handled with clean, dry hands or cotton gloves to prevent corrosion from skin oils. Store in a protective case away from other tooling to avoid contact damage to the ground surface. Clean the gage and bore before use to ensure accurate readings. Calibration and periodic re-inspection against a certified master are recommended to maintain traceability per applicable quality standards.