UL 498 Figure 31.1 Dimensional Compliance Gauge

The UL 498 Figure 31.1 Dimensional Compliance Gauge (PA215A) is a precision testing instrument engineered to validate structural and dimensional conformity of plugs, sockets, and power connectors to UL 498 requirements. Fabricated from high-hardness alloy steel (≥50HRC) with minimal thermal expansion characteristics, this gauge maintains dimensional stability and tolerance accuracy across environmental variations from -10°C to 60°C. Its precisely machined flat configuration, featuring critical dimensions of 0.045 inch thickness, 3/16 inch width, and 3/32 inch width, interfaces with plug and socket apertures to assess compliance. Deployed throughout electronics manufacturing, appliance production, and connector industries, this instrument ensures products satisfy international safety standards for reliable, hazard-free operation.

Specifications:
Tool Type: UL 498 Figure 31.1 Dimensional Compliance Gauge
Material: High-hardness alloy steel (hardness ≥ 50HRC; corrosion-resistant; thermal expansion coefficient ≤ 12×10⁻⁶/°C for dimensional stability)
Key Dimensions:
– Thickness: 0.045 inch (1.14mm) ± 0.001 inch
– Width (1): 3/16 inch (4.8mm) ± 0.002 inch
– Width (2): 3/32 inch (2.4mm) ± 0.002 inch
– Working Length: Configurable (standard testing length 100–150mm)
– Total Length: Dependent on working length (standard configuration 150–200mm)
Surface Finish: Precision machined (surface roughness ≤ Ra 0.8μm; burr-free to prevent test sample damage)
Thermal Stability: Low thermal expansion coefficient (≤ 12×10⁻⁶/°C; maintains tolerance accuracy across -10°C to 60°C operational range)
Core Function: Validates plug/socket structural compliance; verifies dimensional accuracy per UL 498; ensures connector safety and mechanical compatibility

Test Procedures:
1. Inspect the gauge for surface imperfections, dimensional deformation, or mechanical damage; verify critical dimensions using calibrated measurement equipment if required.
2. Prepare the equipment under test (EUT) – clean plug or socket interfaces to eliminate contaminants that could compromise measurement accuracy.