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Home/Impact Sockets/12-Point Impact Sockets/Individuals
TEKTON SID13321-T 3/8 Inch Drive x 21 mm Deep 12-Point Impact Socket
TEKTON SID13321-T 3/8 Inch Drive x 21 mm Deep 12-Point Impact Socket
TEKTON SID13321-T 3/8 Inch Drive x 21 mm Deep 12-Point Impact Socket
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3/8 Inch Drive x 21 mm Deep 12-Point Impact Socket

#SID13321
 • 
InchMetric

Size

6 mm
$5
7 mm
$5
8 mm
$5
9 mm
$5
10 mm
$5
11 mm
$5
12 mm
$5
13 mm
$5
14 mm
$5
15 mm
$5
16 mm
$5
17 mm
$6
18 mm
$6
19 mm
$6
20 mm
$6
21 mm
$7
22 mm
$7
23 mm
$7
24 mm
$7
$7.00

Also available in standard-length


DetailsSpecs

Details

Two Size Markings

The size is marked in two ways on every socket—both as a high-visibility laser marking and a permanent stamped marking.

TEKTON Impact Socket Markings

The size is marked in two ways on every socket—both as a high-visibility laser marking and a permanent stamped marking.

Access + Versatility

TEKTON Deep Impact Socket Fully-Stepped Shoulders

Fully Stepped Shoulders

The narrowed socket diameter goes all the way down to the base of the socket on small deep-length sizes. This allows for better reach into tight recessed areas.

TEKTON Deep Impact Socket Well

Full-Length Socket Well

Not only is the socket a deep length, but the interior well also extends far into the socket, which allows for better fastener engagement in more situations.

Drive Tool Retention

Sockets work for both types of anvils found on 3/8 inch drive impact wrenches:

Impact Wrench Friction Ring

Friction Ring Anvil

 Impact Wrench Detent Pin

Detent Pin Anvil

TEKTON Impact Socket Drive End

12-Point Socket Opening

Provides an exact fit for 12-point fasteners
Learn more

TEKTON Deep Impact Socket Opening

12-Point Socket Opening

Provides an exact fit for 12-point fasteners
Learn more

Prevents Fastener Round-Off
TEKTON Impact Socket Radiused Corners
Prevents Fastener Round-Off

Radiused corners prevent fastener round-off by applying force to a fastener's flat sides rather than its corners.

Sockets Exceed ANSI Torque Standards

Each socket size meets a minimum of 1.2 times the ANSI/ASME standard for proof torque.

(A single-cycle test applies torque until a specified value is reached without failure or permanent deformation.)

INCH SERIES

TEKTON 3/8 Inch Drive Deep Impact Sockets - Proof Torque Chart (Inch Series)
ANSITEKTON
Source: ASME B107.110 - 2012

METRIC SERIES

TEKTON 3/8 Inch Drive Deep Impact Sockets - Proof Torque Chart (Metric Series)
ANSITEKTON
Source: ASME B107.110 - 2012

Note: There are no published ASME standards for 1/4 in., 9/32 in., 13/16 in., 7/8 in., 15/16 in., 1 in., 6 mm and 7 mm impact sockets in 3/8 inch drive.

High-Performing Steel Alloys

Part by part, we choose the best combination of steel alloys, heat treating specifications, and forming processes to meet the highest performance requirements. Learn more

50BV30 Chromium-Vanadium (Cr-V)

Show Elements

Carbon: 0.27 - 0.33%
Chromium: 0.30 - 0.50%
Manganese: 0.70 - 1.00%
Phosphorous: ≤0.030%
Silicon: ≤0.10%
Sulfur: ≤0.030%
Vanadium: 0.10 - 0.15%
Boron: ≥0.0005%
Iron: 97.86 - 98.47%

4140 Chromium-Molybdenum (Cr-Mo)

Show Elements

Carbon: 0.38 - 0.43%
Chromium: 0.80 - 1.10%
Manganese: 0.75 - 1.00%
Molybdenum: 0.15 - 0.30%
Nickel: ≤0.025%
Phosphorous: ≤0.025%
Silicon: 0.15 - 0.35%
Sulfur: ≤0.025%
Iron: 96.74 - 97.69%

6140 Chromium-Vanadium (Cr-V)

Show Elements

Carbon: 0.38 - 0.43%
Chromium: 0.50 - 0.70%
Manganese: 0.6 - 0.9%
Nickel: ≤0.030%
Phosphorous: ≤0.030%
Silicon: 0.15 - 0.35%
Sulfur: ≤0.030%
Vanadium: 0.10 - 0.15%
Iron: 97.38 - 98.18%

8660 Nickel-Chromium-Molybdenum (Ni-Cr-Mo)

Show Elements

Carbon: 0.56 - 0.64%
Chromium: 0.40 - 0.60%
Manganese: 0.75 - 1.00%
Molybdenum: 0.15 - 0.25%
Nickel: 0.40 - 0.70%
Phosphorous: ≤0.035%
Silicon: 0.15 - 0.35%
Sulfur: ≤0.04%
Vanadium: 0.15 - 0.25%
Iron: 96.13 - 97.36%

All pieces have a corrosion-resistant manganese phosphate coating.

Sockets (Standard and Deep Lengths)

INCH

Color coded socket icons showing that all standard-length inch sizes are 6140 Cr-V and deep-length inch sizes are 50BV30 Cr-V.
  • Standard-length sockets are 6140 Cr-V
  • Deep-length sockets are 50BV30 Cr-V

METRIC

Color coded socket icons showing that all standard-length metric sizes are 6140 Cr-V and deep-length metric sizes are 50BV30 Cr-V
  • Standard-length sockets are 6140 Cr-V
  • Deep-length sockets are 50BV30 Cr-V

Accessories

Color coded icons showing that impact socket extensions use 6140 Cr-V

3 in., 6 in., and 10 in. Extensions
(6140 Cr-V)

Color coded icons showing that the impact socket adapter and reducer use 8660 Ni-Cr-Mo

Adapter and Reducer
(8660 Ni-Cr-Mo)

Color coded icons showing that impact universal joints use 8660 Ni-Cr-Mo for the ball end and 4140 Cr-Mo for the socket end

Universal Joint
(Ball: 8660 Ni-Cr-Mo)
(Socket: 4140 Cr-Mo)

Specs

3/8 Inch Drive x 21 mm Deep 12-Point Impact Socket

Specs for 3/8 Inch Drive x 21 mm Deep 12-Point Impact Socket
Country of Origin
Taiwan
Item Weight
0.32 lb.