We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in

TEKTON

TEKTON 13121 3/8 Inch Drive 21 mm Deep 6-Point Impact Socket

SKU CH-MFHV-W9YV7

A 21 mm deep 6-point impact socket built to withstand at least 1.3 times the ANSI/ASME proof torque standard

  • High-visibility laser marking plus permanent stamped marking won't wear off
  • Precise 6-point opening gives exact fit on hex fasteners
  • Meets 1.3 times ANSI/ASME proof torque standard
  • Works with both friction ring and detent pin anvils
  • 3/8 inch drive 21 mm deep impact socket for heavy-duty use

Deep 6-Point Impact Socket

TEKTON 13121 is a 3/8 inch drive impact socket built for removing and tightening 21 mm hex fasteners. High-visibility laser etching and permanent stamped markings ensure the size remains readable after heavy use. The 6-point opening grips the flat sides of the fastener rather than the corners, reducing the chance of rounding. Each socket meets a minimum of 1.3 times the ANSI/ASME proof torque standard.

For high-torque fastening work

Mechanics and technicians who need a single deep socket for 21 mm bolts on impact wrenches will find this tool fits the task. It works with both friction ring and detent pin anvils, covering the two common retention systems. Buyers who need a full set of sizes or a different drive size should look at other configurations. This listing covers one individual socket only.

21 mm hex opening

The 21 mm 6-point opening is the specification that determines whether this socket fits your fastener. It is designed for hex bolts and nuts requiring a deep well to reach recessed threads or protruding studs. Verify the fastener size before purchase, as this socket does not adjust to other dimensions. The 3/8 inch drive square must match your impact wrench anvil.

Highlights

  • High-visibility laser marking plus permanent stamped marking won't wear off
  • Precise 6-point opening gives exact fit on hex fasteners
  • Meets 1.3 times ANSI/ASME proof torque standard
  • Works with both friction ring and detent pin anvils
  • 3/8 inch drive 21 mm deep impact socket for heavy-duty use

Specifications

BrandTEKTON

Questions about this item

Does the 21 mm 6-point opening meet a torque standard that helps prevent rounding on high-torque jobs?

Yes, each socket size meets at least 1.3 times the ANSI/ASME standard for proof torque, and the precise 6-point opening gives an exact fit on hex fasteners.

Will the socket work with both friction ring and detent pin anvils on my existing impact wrench?

It is designed for use with both friction ring anvils and detent pin anvils.

Can the high-visibility laser marking and permanent stamped marking stay readable after heavy daily use?

The socket has both a high-visibility laser marking and a permanent stamped marking that won't wear off.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.