UL 498:2019 Figure SC13.1 Grounding Probe

The GNGPL-SB0704A-SC13.1 is a specialized gauge designed for testing plugs and sockets according to the UL 498:2019 standard (Figure SC13.1, Part No. SB0704A). Precision-machined from hardened steel, it features a perfectly spherical tip and an 8-microinch surface finish. It is used to verify the grounding contact configuration, mating dimensions, and contact reliability, fully complying with the specifications in UL 498:2019 Appendix SC13.1.

Specifications:
• Standard: UL 498:2019 Figure SC13.1, SB0704A
• Material: Hardened steel
• Total Weight: 4 oz (113 g)
• Tip Spherical Radius: 0.1845 inch (4.686 mm)
• Tip Diameter: 0.1840 inch (4.674 mm)
• Shank Outer Diameter: 0.5 inch (12.7 mm)
• Effective Working Length: 0.792–0.797 inch (20.12–20.24 mm)
• Surface Finish: 8 microinches (200 nm), ground in the specified direction

Operating Procedure:
• Secure the socket under test in a stable fixture with the grounding contact facing vertically upward;
• Allow the standard grounding pin to lower naturally into the grounding contact without applying external force;
• Observe the fit and insertion depth of the pin within the grounding contact;
• Verify compliance with UL 498 requirements regarding assembly, travel limits, and contact integrity;
• Remove the gauge after testing; clean and apply anti-rust protection; schedule periodic calibration.

Industry Applications:
• Safety testing of UL-standard plugs and sockets
• Verification of grounding contact dimensions and mating fit
• Routine factory inspections and type testing
• Use by third-party ILAC-accredited testing laboratories and factory QC labs

UL 498:2019 Figure SC13.1