Socket 1/2" Drive Metric Standard 6 pt 21 - NEPROS

Part #: B4-21

The NEPROS B4-21 Socket is an essential tool for professional technicians and mechanics requiring precision and reliability in high-torque applications. Engineered for demanding automotive and industrial environments, this 21mm metric socket delivers consistent performance and a secure fit on fasteners. Its robust 6-point design ensures maximum contact with nuts and bolts, reducing the risk of rounding and enhancing efficiency during critical repairs and assembly.

Key Features

  • Professional-Grade Construction: Manufactured by NEPROS, this socket boasts superior material quality and craftsmanship for extended tool life and dependable use in rigorous settings.
  • 6-Point Design: Provides a secure grip on hex fasteners, minimizing slippage and preventing damage to both the fastener and the socket, particularly useful in tight spaces.
  • 1/2" Drive Compatibility: Designed for use with 1/2" drive ratchets, breaker bars, and impact wrenches, making it suitable for high-torque fastening and loosening tasks.
  • 21mm Metric Size: Precisely sized at 21mm, ideal for specific metric fasteners found in a wide range of vehicles and machinery.
  • Enhanced Durability: Built to withstand the daily wear and tear of professional use, offering consistent performance over time.

Applications

The NEPROS B4-21 21mm socket is versatile and indispensable for various professional tasks. It is commonly used in automotive repair for components such as suspension systems, engine mounts, and certain chassis bolts where a 21mm metric fastener is present. In industrial settings, it's suitable for machinery maintenance, equipment assembly, and repairs on heavy vehicles. This socket is a reliable choice for any mechanic or technician needing a durable, accurate 21mm tool for general mechanical work.

Only 2 left in stock - order soon

$10.10

Add to Cart:
  • (image for) NEPROS
    Other products
    NEPROS Homepage
  • Model: 442441
  • Shipping Weight: 0.2lbs
  • UPC: 00498943134369
  • Manufacturers Part #: B4-21
  • Manufactured by: NEPROS
  • Also Known As: KTC-B4-21

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

Similar Products

(image for) Socket 1/2" Drive Metric Standard 6 pt 25
Socket 1/2" Drive Metric Standard 6 pt 25
NEPROS B4-25
Your Price: $12.70
(image for) Socket 1/4" Drive Metric Standard 6 pt 10mm
Socket 1/4" Drive Metric Standard 6 pt 10mm
NEPROS NB2-10
Your Price: $15.42
(image for) Socket 1/4" Drive Metric Standard 6 pt 3.2
Socket 1/4" Drive Metric Standard 6 pt 3.2
NEPROS B2-032
Your Price: $8.33
(image for) Socket 1/4" Drive Metric Standard 6 pt 6
Socket 1/4" Drive Metric Standard 6 pt 6
NEPROS B2-06
Your Price: $8.44
(image for) Socket 1/4" Drive Metric Standard 6 pt 1
Socket 1/4" Drive Metric Standard 6 pt 1
NEPROS B2-10
Your Price: $8.44
(image for) Socket 1/4" Drive Metric Standard 6 pt 11
Socket 1/4" Drive Metric Standard 6 pt 11
NEPROS B2-11
Your Price: $8.44
(image for) Socket 1/4" Drive Metric Standard 6 pt 13
Socket 1/4" Drive Metric Standard 6 pt 13
NEPROS B2-13
Your Price: $9.32
(image for) Socket 1/2" Drive Metric Standard 6 pt 9
Socket 1/2" Drive Metric Standard 6 pt 9
NEPROS B4-09
Your Price: $8.96
(image for) Socket 1/2" Drive Metric Standard 6 pt 11
Socket 1/2" Drive Metric Standard 6 pt 11
NEPROS B4-11
Your Price: $8.96
(image for) Socket 1/2" Drive Metric Standard 12 pt 13
Socket 1/2" Drive Metric Standard 12 pt 13
NEPROS B4-13W
Your Price: $8.96
(image for) Socket 1/2" Drive Metric Standard 6 pt 14
Socket 1/2" Drive Metric Standard 6 pt 14
NEPROS B4-14
Your Price: $8.96
(image for) Socket 1/2" Drive Metric Standard 6 pt 17
Socket 1/2" Drive Metric Standard 6 pt 17
NEPROS B4-17
Your Price: $9.42