Spi 19-249-2 Class Zz Minus Plug Pin Gage 0.249 in

Product Description

The SPI 19-249-2 is a Class ZZ minus plug pin gage machined to a 0.249 inch nominal diameter with a tolerance of 0.0002 inches. This type of gage is used to verify that a drilled, reamed, or machined hole meets its dimensional specification. The minus designation means the gage is ground below nominal, following standard GO gage practice for checking minimum material condition. The steel construction provides the hardness and stability required for consistent, repeatable inspection results. Machinists, quality technicians, and tool and die professionals use pin gages as part of incoming inspection, in-process checking, and final verification routines.

This gage is suited for use in machine shops, manufacturing floors, and quality labs where hole diameter verification is part of standard inspection workflow. The 0.249 inch size targets holes in that diameter range, commonly encountered in precision component machining, jig and fixture work, and close-tolerance assembly operations. Its compact, single-pin format integrates easily into manual inspection routines and works alongside micrometer sets, ring gages, and surface plates.

Key Features

• Class ZZ tolerance classification for general-purpose inspection use
• Minus designation confirms GO gage orientation at minimum material condition
• 0.249 inch nominal diameter targets precision-machined holes in that size range
• Tolerance of 0.0002 inches (0.0002 mm) for consistent dimensional verification
• Steel construction provides hardness and dimensional stability for repeated use

Compatibility

Designed as a standard plug pin gage for use in any inspection application requiring verification of a 0.249 inch nominal diameter hole to Class ZZ minus specifications.

Installation Notes

Pin gages are handled and stored by quality technicians and machinists following standard metrology practices. Keep the gage clean and lightly oiled when not in use to prevent corrosion. Do not force the gage into a hole; insertion should require only light hand pressure. Store in a protective case away from impact and temperature extremes to maintain calibration integrity.