Milwaukee Tool Bit Socket Expansion: Hex, Torx, & Triple Square (Low Profile to 6″)

The Ultimate Tight-Access Solution: Milwaukee’s New Bit Socket Expansion

When you’re deep in an engine bay or buried in a piece of industrial machinery, the difference between a quick fix and a four-hour nightmare often comes down to one thing: access. Milwaukee Tool has officially addressed this head-on with their massive new Bit Socket Expansion, featuring Hex, Torx, and Triple Square sets.

These aren’t just more of the same. Milwaukee has engineered these from the ground up to solve the most common frustrations mechanics face with standard bit sockets.

The “Four Flat™” Advantage

The standout feature across this entire lineup is the FOUR FLAT™ side design. Unlike traditional round sockets, these feature four parallel flat sides that provide two massive benefits:

• Anti-Roll: They stay exactly where you put them on the bench or a slanted subframe.

• Wrench-Ready: If you don’t have enough overhead clearance for a ratchet, you can slide a wrench directly onto the flats of the socket to break a fastener loose.

Built for Professional Durability

Traditional bit sockets often use a two-piece design where the bit is pressed into the socket base. Over time, or under high torque, these can separate. Milwaukee has moved to a one-piece forged steel construction, significantly increasing durability and eliminating the risk of bit-pop.

Three Lengths for Every Scenario

To ensure you have the right tool for the job, the expansion includes three distinct lengths:

1. Low-Profile: These feature an incredibly slim profile and compact head height. They are the “Tight Access Kings,” perfect for interior work, dash assemblies, and cramped engine components.

2. Regular: Your go-to daily drivers for standard mechanical work, available in both 1/4″ and 3/8″ drive.

3. 6″ Extended: These allow you to reach recessed fasteners—like valve cover bolts or bell housing bolts—without the “wobble” and power loss associated with using multiple extensions.

Specialized Fasteners: Triple Square (XZN)

For technicians working on European vehicles (VW, Audi, BMW), the addition of a pro-grade Triple Square (XZN) set is a game-changer. These sets cover the most common sizes, from M4 to M18, ensuring you’re ready for everything from head bolts to axle stubs.

Key Specifications at a Glance

Whether you are a professional mechanic or a high-end DIYer, this expansion provides the versatility needed to handle modern fasteners in the tightest spaces.

Hex Bit Socket Sets

These sets are built with the FOUR FLAT™ design for better wrench compatibility and to prevent rolling.

• 1/4″ Drive Low-Profile (Metric): 48-22-9545 (10 PC, 2mm–10mm)

• 1/4″ Drive Low-Profile (SAE): 48-22-9544 (12 PC, 1/16″–3/8″)

• 3/8″ Drive Regular (Metric): 48-22-9543 (11 PC)

• 3/8″ Drive 6″ Extended (Metric): 48-22-9547 (7 PC, 4mm–10mm)

• 3/8″ Drive 6″ Extended (SAE): 48-22-9546 (8 PC, 1/8″–3/8″)

• 3/8″ Drive 6″ Extended Ball End (Metric): 48-22-9548 (7 PC)

• 3/8″ Drive 6″ Extended Ball End (SAE): 48-22-9549 (8 PC)

Torx Bit Socket Sets

All Torx sets feature one-piece forged construction to eliminate bit separation.

• 1/4″ Drive Low-Profile Torx: 48-22-9533 (11 PC, T8–T50)

• 1/4″ Drive Regular Torx: 48-22-9530 (6 PC, T8–T27)

• 1/4″ & 3/8″ Drive 6″ Extended Torx: 48-22-9534 (11 PC, T8–T50)

• 1/4″ & 3/8″ Drive Tamper Proof Torx: 48-22-9537 (13 PC)

Triple Square (XZN) Sets

Specifically designed for European automotive maintenance.

• 3/8″ Drive Triple Square: 48-22-9536 (12 PC, 4mm–18mm)

  • Includes: Standard, one-piece sockets with anti-roll flat sides.

Comparison Table for Quick Reference