PROTO Socket: Metric, 1/2 in Drive Size, 21 mm Socket Size, 12-Point, Deep, Chrome
The PROTO Socket: Metric (SKU 3G-OTH-328615) is a tether-ready hand socket from PROTO, featuring a 1/2 in drive size, 21 mm socket size, 12-point deep design, and a Chrome finish (MPN J5321M-TT).
SKU 3G-OTH-328615
Also listed as: J5321MTT · J5321M TT
Local availability & support — Singapore
- Local office
- 20 Woodlands Link #09-05, Singapore 738733
- Phone
- +65 8878 8355
- Delivery
- Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
- Payment
- Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
- Ships to
- Singapore
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Product Description
The PROTO Socket: Metric (SKU 3G-OTH-328615) is a tether-ready hand socket from PROTO, featuring a 1/2 in drive size, 21 mm socket size, 12-point deep design, and a Chrome finish (MPN J5321M-TT).
Frequently Asked Questions
What is the PROTO J5321M-TT socket used for?
The PROTO J5321M-TT is a tether-ready hand socket used for tightening or loosening metric fasteners in industrial maintenance, automotive repair, and assembly applications. Its 12-point deep design provides secure engagement on hex bolts, while the tether-ready feature helps prevent tool drops in elevated or confined workspaces.
What are the specifications of the PROTO J5321M-TT socket?
The PROTO J5321M-TT socket has a 1/2 in drive size, 21 mm socket size, 12-point deep profile, and a Chrome finish. It is tether-ready, allowing attachment of a lanyard for tool retention. The manufacturer part number is J5321M-TT, and it is part of PROTO's metric hand socket line.
Where to buy the PROTO J5321M-TT socket worldwide?
You can source the PROTO J5321M-TT socket worldwide through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to your location. Contact us for availability and lead time; we supply genuine PROTO tools to industrial buyers internationally.
How to select the correct PROTO socket for your application?
To select the correct PROTO socket, match the drive size (e.g., 1/2 in) to your ratchet or torque wrench, and choose the socket size (e.g., 21 mm) to fit your fastener. For recessed bolts, use a deep socket like the J5321M-TT. Tether-ready options are recommended for overhead or safety-critical work to prevent dropped tools.
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.
