PROTO J5221M-TT Tether-Ready Hand Socket
The PROTO Socket: Metric (SKU J5221M-TT, MPN J5221M-TT) is a tether-ready hand socket with a 3/8 in drive size and 21 mm socket size. It features a 12-point, deep design in chrome finish, manufactured by PROTO.
SKU 3G-OTH-328614
Also listed as: J5221MTT · J5221M TT
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Product Description
The PROTO Socket: Metric (SKU J5221M-TT, MPN J5221M-TT) is a tether-ready hand socket with a 3/8 in drive size and 21 mm socket size. It features a 12-point, deep design in chrome finish, manufactured by PROTO.
Frequently Asked Questions
What is the PROTO J5221M-TT socket used for?
The PROTO J5221M-TT is a tether-ready hand socket used for tightening or loosening metric fasteners. Its 21 mm, 12-point, deep design suits automotive, industrial, and maintenance applications where tool retention is critical. The chrome finish resists corrosion.
What are the specifications of the PROTO J5221M-TT socket?
The PROTO J5221M-TT socket has a 3/8 in drive size and a 21 mm socket size. It features a 12-point, deep profile with a chrome finish. The tether-ready design allows attachment of a lanyard for tool security. PROTO manufactures this model under MPN J5221M-TT.
Where to buy the PROTO J5221M-TT socket worldwide?
You can source the PROTO J5221M-TT socket worldwide through 3G Electric. As a global industrial equipment distributor, 3G Electric handles full logistics, customs clearance, and delivery to your location. Contact 3G Electric for availability and lead time.
How to select the correct PROTO socket size?
To select the correct PROTO socket, match the drive size (3/8 in) to your ratchet or torque wrench. The socket size (21 mm) must fit the fastener head. For deep fasteners or recessed nuts, choose a deep socket like the J5221M-TT. Tether-ready models add tool security.
Used in
Common applications for PROTOPROTO Products
3G Electric supplies PROTO tether-ready hand sockets. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.