Cut Sheet

12/28/2018 3-1/2 Inch ST Aluminum Knockout Hub
https://plastibond.com/product/prsta9 1/2
Description
3-1/2 Inch ST Aluminum Knockout Hub
PVC coated ST knockout hubs are used to terminate conduit runs through the wall of
a sheet metal electrical enclosure.
Application
Used to terminate conduit runs through the wall of a sheet metal electrical
enclosure
Features
40 mil gray PVC exterior coating
2 mil red urethane interior coating
Available in 12 trade sizes from 1/2" through 6"
Sealing sleeves on conduit side of hub
Molded PVC gasket seals flush with enclosure wall
O-ring gasket provides additional seal
General
Material: ALUMINUM
Exterior Finish: A nominal .040 inch (40 mil) gray PVC
coating
Interior Finish: A nominal .002 inch (2 mil) red urethane
Seal Type: O-ring gasket
Grounding Lug: Available on STG
Dimensions
Dimension A (Inches): 2.38
Dimension B (Inches): 5.5
Dimension C (Inches): 1.44
Max Wall Thickness (Inches): .25
Technical / Specification Documents
Specification Guide (1995 Master) AVAILABLE ON WEBSITE
Specification Guide (2004 Master) AVAILABLE ON WEBSITE
Installer Certification and Tools AVAILABLE ON WEBSITE
Chemical Resistance Charts AVAILABLE ON WEBSITE
Performance Specifications AVAILABLE ON WEBSITE
Standards
NEC/CEC: Class I, Division 2
NEC/CEC: Class II, Division 1 & 2
NEC/CEC: Class III, Division 1 & 2
Notes
All Screw-tight Hubs are listed for NEMA and UL type enclosures 2, 3, 3R, 4, 4x, 11
and 12
Grounding and Bonding Hubs are listed for NEMA Enclosures 2, 3, 3R, 4 and
PVC Coated ST Style Knockout Hub
Catalog Number: PRSTA9
UPC: 784011219001