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Apex 3/8 inch drive socket extension, four inches long, oiled finish

Apex

Apex EX-376-4 3/8" Drive 4" Socket Extension

SKU CH-NSKZ-8FKY5

A 4-inch extension for 3/8-inch drive sockets with a pin-lock mechanism and oiled finish meeting ASME B107.17 standards

  • ColorTransparent
  • Extends reach in tight spaces with 4" length
  • Fits 3/8" drive sockets via male/female square design
  • Secure socket retention through pin-lock mechanism
  • Resists corrosion with protective oiled finish
  • Meets ASME B107.17 standard for professional reliability

Reach & Drive Fit

The Apex EX-376-4 is a 4-inch socket extension built for 3/8-inch drive tools. It lets mechanics and technicians reach fasteners set deep inside engine bays or machinery where a ratchet alone cannot fit.

Build & Daily Use

The single-piece chrome-alloy steel body meets ASME B107.17 standards and carries a light oil coat that resists corrosion in workshop environments. A female-to-male square drive with a pin-lock detent keeps sockets secured during high-torque work, while the transparent finish makes wear easy to spot.

Deciding Spec

The 3/8-inch square drive on both ends is the only fitment that matters; this extension will not couple with 1/4-inch or 1/2-inch drive tools. Buyers needing a different drive size or a longer reach must select another part.

Highlights

  • Extends reach in tight spaces with 4" length
  • Fits 3/8" drive sockets via male/female square design
  • Secure socket retention through pin-lock mechanism
  • Resists corrosion with protective oiled finish
  • Meets ASME B107.17 standard for professional reliability

Specifications

BrandAPEX TOOL GROUP
ColorTransparent

Questions about this item

Does the 3/8" drive extension meet ASME B107.17?

Yes, the EX-376-4 is manufactured to ASME B107.17, so its square-drive dimensions and torque limits follow that standard.

What clearance does the 4-inch length need in a socket rail or toolbox drawer?

The overall length is 4 inches; allow at least that much straight depth plus the socket length for the piece to lie flat or stand upright.

How do I seat the pin-lock so the socket will not fall off mid-job?

Push the socket onto the male square until the detent pin clicks into the socket's retention hole; a distinct click confirms full engagement.

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