An E20 socket is a star-shaped external Torx (E‑Torx) socket sized to fit fasteners with an E20 head. It’s commonly used on automotive and equipment bolts that have a six‑lobed male profile.

• Purpose: Provides full, secure contact on E‑Torx bolts to help reduce slipping compared with hex sockets.
• Drive options: You’ll find E20 sockets in 3/8 in. and 1/2 in. drive, in shallow or deep lengths.
• Sets vs. singles: Many sets cover E‑sizes from E4 to E24, which can be helpful if you’re not sure of the exact size.

For safer results, seat the socket fully and keep it square to the fastener before applying torque.

“E20” is the E‑Torx size designation—it's not a direct metric or SAE hex measurement. An E20 socket is engineered to mesh with E20 external Torx fasteners, which have a six‑lobed male head.

1. Check specs: Service manuals and parts diagrams often call out E‑sizes (E4–E24).
2. Match markings: Some fasteners or kits label the required E‑size.
3. Test fit: The correct E20 socket should slide on snugly with full contact and minimal wobble.

If you’re uncertain, a socket set that includes multiple E‑sizes can help you find the best fit. Choose the drive size (3/8 in. or 1/2 in.) to match your ratchet or torque tool.

Use an E‑Torx (external Torx) socket that matches the fastener size (e.g., E20). Regular hex sockets aren’t shaped for the lobes and can slip or round the bolt head.

• Why E‑Torx matters: It contacts the lobes properly, which can help reduce damage to the fastener.
• Fit and technique: Seat the socket fully, keep it square, and apply steady, controlled force.
• Stubborn bolts: Cleaning debris from the head and using a penetrating oil may help. Consider a breaker bar or impact‑rated socket if appropriate for your tool.

Choosing the correct E‑size first is a practical way to protect both your hardware and your tools.

E‑sockets and Torx bits serve different fastener types, even though both use the star pattern:

• E‑sockets (E4–E24): Designed for external Torx bolts with a six‑lobed male head. These install on a ratchet/driver via a square drive (3/8 in. or 1/2 in.).
• Torx bits (T‑sizes like T8–T70): Designed for internal Torx screws with a six‑lobed recess. They typically mount in bit holders or bit sockets.

They’re complementary, not interchangeable. Using the correct tool type helps maintain grip and may reduce the chance of stripping. Many tool kits sold together include both E‑sockets and T‑bit sockets for broader coverage.

It depends on access and fastener depth:

• Deep E20: Helpful for recessed nuts or when a stud protrudes past the nut. Extra length can reach over threads and obstructions.
• Shallow E20: Useful in tight spaces where clearance is limited. Often preferred for general tasks and when working close to surfaces.

Also consider your drive size (3/8 in. for lighter, tighter work; 1/2 in. for higher torque) and whether you need impact‑rated sockets for power tools. On Walmart.com, you can narrow options by drive size, socket depth, and finish to find the best fit for your project.