3/8 in Drive, 21mm Triple Square Metric Socket, 12 Points, Steel, Chrome, 21 mm MPN:J5221M

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In Stock
Brand: Proto
Part #: J5221M
UPC: 662679161644
SKU
510-G3905163
$67.74 for Order Qty of 6
Regular Price $15.81 Special Price $11.29

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3/8 in Drive, 21mm Triple Square Metric Socket, 12 Points, Steel, Chrome, 21 mm

This 3/8 in Drive, 21mm Triple Square Metric Socket is designed for demanding applications in aerospace, automotive, and industrial settings. The full polish socket meets and exceeds stringent aerospace specification AS4984A, providing superior corrosion-resistance and durability. The 12-point design is ideal for use on stubborn or damaged fasteners, while the intermediate length offers additional reach without compromising accessibility in tight spaces. Featuring Proto's TorquePlus design, this socket is engineered to deliver exceptional performance and reliability. Perfect for use in heavy-duty environments, this socket is a must-have for professionals who demand the best.

Top product features:

  • Full polish sockets meet and exceed stringent aerospace specification AS4984A which requires tools to have a thicker nickel-chrome coating for greater corrosion-resistance and durability.
  • 12-Point sockets are ideal for use on stubborn or damaged fasteners.
  • Features TorquePlus design.

Top product applications:

  • Stubborn or damaged fasteners
  • Tight spaces with limited accessibility
  • Aerospace applications requiring high corrosion-resistance and durability

Full polish sockets meet and exceed stringent aerospace specification AS4984A which requires tools to have a thicker nickel-chrome coating for greater corrosion-resistance and durability
12-Point sockets are ideal for use on stubborn or damaged fasteners
Intermediate lengths give additional reach without limiting accessibility in tight spaces

Additional Features:

  • - Features TorquePlus™ design


Additional Information

  • Country of Origin: US
  • Drop Ship Item: No
  • Blind Ship Eligible: No
  • LTL Freight Required: No
  • Lead Time: Ships in 1 days
  • Minimum Order Quantity: 1
  • Unit of Measure: EA
  • Package Length: 1.00
  • Package Width: 1.00
  • Package Height: 1.20
  • Package Weight: 0.17
Product info last updated on February 21, 2026 7:49pm UTC Category: Hand Tools
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In stock