Knockout Hubs Specifications
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Applications
KorKap ST style knockout hubs are used to terminate conduit runs through the wall of a sheet metal electrical enclosure. They are available with or without grounding lug. STTB style hubs are “Through-Bulkhead” fittings used to pass conduit runs through firewalls or bulkheads up to 1/8" thick. STTTB style hubs perform the same function for unlimited wall thicknesses, (furnished without nipples).
Physical Properties
• 40 mil gray PVC exterior coating
• 2 mil gray urethane interior coating
• ST and STTB available in 12 trade sizes from 1/2" through 6"
• STTTB in 6 trade sizes from 1/2" through 2".
• Sealing sleeves on conduit side of hub
• Molded PVC gasket seals flush with enclosure wall.
• O-ring gasket provides additional seal
Standards
• UL
• CSA
NOTE:
• All Screw-tight Hubs are listed for NEMA type enclosures 2, 3, 3R, 4, 4x, 11 and 12
• Grounding and Bonding Hubs are listed for NEMA Enclosures 2, 3, 3R, 4 and 12
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