Proto J5540 Hand Socket 1-1/4 in 3/4 Drive 12-point

Product Description

The PROTO J5540 is a 12-point hand socket designed for heavy-duty fastener work in professional trade and industrial environments. Built from alloy steel with a chrome-plated finish, it accepts a 3/4 inch drive and fits 1-1/4 inch fasteners. The 12-point configuration allows engagement at 30-degree increments, giving technicians more swing-arc flexibility in tight spaces. Overall length is 2-15/64 inches, placing it in the standard-length category. It meets ASME B107.110-2012 and SAE AS954G standards, making it suitable for work where documented tooling compliance matters. This socket is not tether capable.

The J5540 is used wherever a 3/4 inch drive, 1-1/4 inch socket is required — including HVAC equipment assembly, large-diameter pipe flanges, compressor mounting hardware, and general mechanical service on commercial or industrial systems. It is a standard-length socket suited for accessible fastener locations. Licensed mechanics, pipefitters, HVAC technicians, and general maintenance tradespeople are the typical users of this size and drive class.

Key Features

• 1-1/4 inch socket size fits common large-hex fasteners in mechanical and HVAC applications
• 3/4 inch drive compatible with standard heavy-duty ratchets and breaker bars
• 12-point design allows engagement every 30 degrees for use in restricted swing areas
• Alloy steel construction provides high torque capacity and durability
• Chrome-plated finish resists corrosion and simplifies cleaning
• Meets ASME B107.110-2012 and SAE AS954G standards

Compatibility

Designed for use with 3/4 inch drive hand tools including ratchets, breaker bars, and extensions; fits 1-1/4 inch 12-point hex fasteners.

Installation Notes

Installation and removal of fasteners with this socket should be performed by qualified tradespeople using appropriately rated 3/4 inch drive equipment. Verify fastener size and drive compatibility before applying torque. Do not use impact drivers with this hand socket unless the tool is explicitly rated for impact use. Follow applicable industry and equipment manufacturer torque guidelines for the fastener being serviced.