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The PROTO J5239-45W is a hand Torx bit socket designed for T45 fastener applications in professional trade and industrial settings. Built on a 3/8 inch drive, this socket delivers the torque transfer needed for heavy-duty bolts and fasteners commonly found in automotive, machinery, and equipment maintenance. The overall length of 1-31/32 inches makes it a compact, manageable tool in tight clearance situations. Licensed tradespeople, mechanics, and industrial technicians rely on this socket for consistent engagement with T45 Torx fastener heads, reducing the risk of cam-out or fastener damage during service work.
This socket fits standard 3/8 inch drive ratchets, extensions, and torque wrenches. It is suited for automotive service, HVAC equipment assembly, electrical panel work, and general equipment maintenance wherever T45 Torx fasteners are specified. The compact OAL allows use in moderate-clearance applications without requiring an extension in most standard service scenarios. It is sold individually and is appropriate for both shop use and field service kits.
Designed for use with standard 3/8 inch drive hand tools including ratchets, breaker bars, extensions, and torque wrenches requiring a T45 Torx bit socket.
De-energize or lock out equipment before accessing fasteners on electrical or mechanical assemblies. Ensure the drive connection is fully seated before applying torque to prevent rounding of the drive socket or fastener head. Use with a calibrated torque wrench when fastener torque specifications are required by the manufacturer or applicable service code. Inspect the socket for wear or cracking before each use.
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