Free shipping on orders overFree shipping over $250 Lower 48 states and DC. Excludes freight and oversize.

Socket 3/8" Drive Metric Standard 12 pt 21 - NEPROS

Part #: B3-21W

The NEPROS B3-21W 3/8" Drive Metric Standard 12 pt 21 Socket is engineered for professional technicians and mechanics who demand precision, durability, and reliable performance in challenging environments. This 21mm, 12-point socket is designed for secure fastener engagement, making it an indispensable tool for a wide array of automotive and industrial maintenance tasks. Crafted to NEPROS' exacting standards, it ensures consistent quality and long-term service life.

Key Features

  • Professional-Grade Construction: Manufactured from high-grade steel, the NEPROS B3-21W socket offers exceptional strength and resistance to wear, ensuring it stands up to the rigors of daily professional use.
  • 12-Point Design: The 12-point configuration allows for easier indexing and better engagement with hex fasteners, reducing the risk of rounding corners and improving efficiency in tight spaces.
  • Precision Metric Sizing: At 21mm, this socket provides a precise fit for corresponding metric fasteners, critical for avoiding slippage and potential damage to components during torque application.
  • 3/8" Drive Compatibility: Designed for use with 3/8" drive ratchets, breaker bars, and extensions, offering versatility and compatibility with common professional toolsets.
  • Optimized Wall Thickness: Engineered with a balanced wall thickness for strength without excessive bulk, facilitating access to fasteners in confined areas.

Applications

This NEPROS 21mm standard socket is ideal for a variety of tasks across automotive and industrial sectors. It is particularly suitable for general vehicle maintenance, including engine component work, chassis adjustments, and suspension repairs on a wide range of cars, trucks, and heavy equipment. Its robust construction also makes it suitable for fastening and unfastening applications on machinery and equipment in industrial settings.

Specifications

  • Manufacturer: NEPROS
  • Model Number: B3-21W
  • Drive Size: 3/8"
  • Socket Size: 21mm
  • Point Count: 12-point
  • Type: Standard
  • System: Metric
Only 1 left in stock - order soon

$9.07

Free shipping on orders over $250
Lower 48 states and DC. Excludes freight and oversize items.
Add to Cart:
  • (image for) NEPROS
    Other products
    NEPROS Homepage
  • Model: 442211
  • Shipping Weight: 0.18lbs
  • UPC: 00498943129839
  • Manufacturers Part #: B3-21W
  • Manufactured by: NEPROS
  • Also Known As: KTC-B3-21W

This product was added to our catalog on Saturday 30 May, 2026.

Similar Products

(image for) Socket 3/8" Drive Metric Standard 12 pt 8mm
Socket 3/8" Drive Metric Standard 12 pt 8mm
NEPROS NB3-08W
Your Price: $13.50
(image for) Socket 3/8" Drive Metric Standard 12 pt 13mm
Socket 3/8" Drive Metric Standard 12 pt 13mm
NEPROS NB3-13W
Your Price: $15.42
(image for) Socket 3/8" Drive Metric Standard 12 pt 7
Socket 3/8" Drive Metric Standard 12 pt 7
NEPROS B3-07W
Your Price: $7.94
(image for) Socket 3/8" Drive Metric Standard 6 pt 8
Socket 3/8" Drive Metric Standard 6 pt 8
NEPROS B3-08
Your Price: $7.94
(image for) Socket 3/8" Drive Metric Standard 12 pt 8
Socket 3/8" Drive Metric Standard 12 pt 8
NEPROS B3-08W
Your Price: $7.94
(image for) Socket 3/8" Drive Metric Standard 12 pt 9
Socket 3/8" Drive Metric Standard 12 pt 9
NEPROS B3-09W
Your Price: $8.44
(image for) Socket 3/8" Drive Metric Standard 6 pt 1
Socket 3/8" Drive Metric Standard 6 pt 1
NEPROS B3-10
Your Price: $8.44
(image for) Socket 3/8" Drive Metric Standard 12 pt 1
Socket 3/8" Drive Metric Standard 12 pt 1
NEPROS B3-10W
Your Price: $8.44
(image for) Socket 3/8" Drive Metric Standard 12 pt 11
Socket 3/8" Drive Metric Standard 12 pt 11
NEPROS B3-11W
Your Price: $8.44
(image for) Socket 3/8" Drive Metric Standard 12 pt 13
Socket 3/8" Drive Metric Standard 12 pt 13
NEPROS B3-13W
Your Price: $8.44
(image for) Socket 3/8" Drive Metric Standard 12 pt 15
Socket 3/8" Drive Metric Standard 12 pt 15
NEPROS B3-15W
Your Price: $8.70
(image for) Socket 3/8" Drive Metric Standard 6 pt 16
Socket 3/8" Drive Metric Standard 6 pt 16
NEPROS B3-16
Your Price: $8.70