Spi 19-511-5 Class Zz Minus Plug Pin Gage 0.511 in

Product Description

The SPI 19-511-5 is a Class ZZ minus plug pin gage machined from steel for use in go/no-go dimensional inspection of bored holes, drilled passages, and precision-machined features. Designed to the minus tolerance convention, this gage measures 0.511 inches in diameter with a tolerance of 0.0002 inches, placing it within the Class ZZ specification for general-purpose inspection work. At 0.2 pounds, it is a compact, hand-held tool suited to shop-floor and inspection-bench use by machinists, quality technicians, and toolroom professionals performing production or incoming inspection tasks.

Class ZZ plug gages are the standard choice for checking hole diameters in moderate-tolerance manufacturing environments. This gage is appropriate for verifying drilled, reamed, or bored holes in metal, plastic, or composite workpieces where dimensional conformance to drawing tolerances is required. It is commonly used in HVAC component manufacturing, plumbing fittings production, and general precision machining inspection where go/no-go verification is part of the quality control workflow.

Key Features

• Class ZZ minus tolerance designation for general-purpose dimensional inspection
• 0.511 inch nominal diameter for precise hole verification
• 0.0002 inch tolerance for reliable conformance checking
• Steel construction for durability in shop and inspection environments
• Lightweight at 0.2 pounds for comfortable hand-held use

Compatibility

Designed as a standard Class ZZ minus plug gage for general-purpose hole inspection applications requiring a 0.511 inch nominal diameter check.

Installation Notes

Plug pin gages are installed and operated by quality technicians or machinists without requiring special tools beyond a clean, burr-free workpiece bore. Before use, clean both the gage and the feature being inspected to remove chips, coolant, and debris that could affect measurement accuracy. Never force a plug gage into an undersized hole, as this can damage the gage and invalidate its calibration. Gages should be periodically recalibrated per applicable metrology standards to maintain measurement traceability.