Spi 19-375-5 Class Zz Minus Plug Pin Gage 0.3750 in

Product Description

The SPI 19-375-5 is a Class ZZ minus plug pin gage machined from steel and used to verify bore and hole dimensions with precision tolerance control. It measures a nominal diameter of 0.3750 inches and carries a tolerance of 0.0002 inches, placing it in the Class ZZ category for general-purpose inspection work. Minus plug gages are sized at the low end of the tolerance band, making them well suited for go/no-go inspection routines in production and quality-control environments. Machinists, toolroom technicians, and quality assurance professionals use this type of gage to confirm that drilled, reamed, or bored holes fall within specification before parts advance to the next stage of manufacturing.

This pin gage is intended for shop-floor and inspection-room use in light manufacturing, machining, and fabrication settings. It is appropriate for checking hole diameters in metal, plastic, and composite workpieces wherever a 0.3750-inch nominal bore is called out on a print. The Class ZZ tolerance rating suits standard production inspection rather than master or reference gage applications. It is typically used as a standalone gage or as part of a set for systematic bore verification across a range of sizes.

Key Features

• Nominal diameter of 0.3750 inches for direct bore verification at that callout size
• Class ZZ minus tolerance of 0.0002 inches for general-purpose production inspection
• Steel construction for durability and dimensional stability under shop conditions
• Compact, lightweight design at 0.2 pounds for easy single-hand operation
• Single-piece packaging suitable for individual replacement or kit supplementing

Compatibility

Designed as a general-purpose Class ZZ minus plug pin gage for use in standard bore inspection applications requiring a 0.3750-inch nominal diameter measurement.

Installation Notes

Pin gages are handled by quality technicians and toolroom personnel and require no permanent installation. Keep the gage clean and lightly oiled when not in use to prevent corrosion and maintain dimensional accuracy. Do not force the gage into a hole; apply only light hand pressure to avoid galling the gage or damaging the workpiece. Store in a protective case away from temperature extremes to preserve tolerance integrity.