UL 498:2019 Figure SC13.2 Oversize Grounding Probe

The GNGPL-SB0705-SC13.2 is a specialized gauge designed for testing plugs and sockets against the UL 498:2019 standard (specifically Figure SC13.2, “Oversized Grounding Pin,” Part No. SB0705). Precision-machined from hardened steel, it features a spherical tip and an 8-microinch surface finish. It is used to verify the maximum acceptance dimensions of the grounding contact opening and to check the socket’s resistance to undersized pins and mating failures, fully complying with the drawing requirements of UL 498:2019 Appendix SC13.2.

Specifications:
• Standard: UL 498:2019 Figure SC13.2 (SB0705)
• Material: Hardened steel
• Nominal shaft diameter: 0.5 inch (13 mm)
• Tip diameter: 0.203–0.204 inch (5.16–5.18 mm)
• Effective working length: 0.840–0.843 inch (21.34–21.41 mm)
• Surface finish: 8 microinches (200 nm), ground in the specified direction

Operating Procedure:
• Securely mount the socket under test with the grounding contact opening facing vertically upward.
• Allow the oversized grounding pin to lower into the grounding contact opening under its own weight; do not apply additional external force.
• Check if the gauge inserts properly to determine compliance with the maximum limit dimensions of the grounding contact opening.
• Evaluate the dimensional margin and mating performance of the grounding structure against relevant UL 498 clauses.
• Remove the gauge after testing, clean and apply anti-rust protection, and perform periodic calibration.

Industry Applications:
• UL safety type testing for plugs and sockets
• Verification of maximum limit dimensions for grounding contact openings
• Finished product inspection on production lines and dimensional control of incoming materials
• Use by ILAC-accredited third-party testing laboratories and electrical manufacturing quality control departments

UL 498:2019 Figure SC13.2