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PROTO Socket Bit: 3/8 in Drive Size, Hex Tip, 10 mm Tip Size, 1 25/32 in Overall Lg - Hex Bit Sockets
PROTOHex Bit Sockets

PROTO Socket Bit: 3/8 in Drive Size, Hex Tip, 10 mm Tip Size, 1 25/32 in Overall Lg

The PROTO Socket Bit (SKU 3G-OTH-305252, MPN J4990-10MST) is a hex bit socket with a 3/8 in drive size and a 10 mm hex tip size. It features a fixed insert design and has an overall length of 1 25/32 in. This…

SKU 3G-OTH-305252

Also listed as: J499010MST · J4990 10MST

Brand
PROTO
Item
Socket Bit: 3/8 in Drive Size, Hex Tip, 10 mm Tip Size, 1 25/32 in Overall Lg
Category
Hex Bit Sockets
Available to Order
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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

Technical Specifications

PROTO
Manufacturer Part Number
J4990-10MST
Type
Hex Tip, Fixed Insert
Overall Lg
1 25/32 in
Tip Size
10 mm

Technical Documents

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PROTO Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The PROTO Socket Bit (SKU 3G-OTH-305252, MPN J4990-10MST) is a hex bit socket with a 3/8 in drive size and a 10 mm hex tip size. It features a fixed insert design and has an overall length of 1 25/32 in. This PROTO-branded tool is intended for use with compatible drive tools.

Frequently Asked Questions

What is the PROTO J4990-10MST socket bit used for?

The PROTO J4990-10MST is a hex bit socket used to drive hex-head fasteners. It is designed for assembly, maintenance, and repair tasks across industrial sectors such as machining, material handling, and pneumatics. The 3/8 in drive size and 10 mm hex tip make it suitable for use with compatible ratchets and drivers.

What are the specifications of the PROTO J4990-10MST?

The PROTO J4990-10MST is a hex bit socket with a 3/8 in drive size, 10 mm hex tip size, and 1 25/32 in overall length. It features a fixed insert design. The manufacturer part number is J4990-10MST. This PROTO-branded tool is intended for use with compatible drive tools.

Where to buy the PROTO J4990-10MST worldwide?

3G Electric supplies the PROTO J4990-10MST hex bit socket to customers worldwide. As a global industrial solutions provider, we handle full logistics, customs clearance, and delivery to your location. Contact us to order this PROTO socket bit for your maintenance or assembly needs.

How to select the correct hex bit socket for a job?

To select the correct hex bit socket, match the drive size (e.g., 3/8 in) to your ratchet or driver, and the tip size (e.g., 10 mm) to the fastener. Consider overall length for access in tight spaces. The PROTO J4990-10MST fixed insert design provides secure engagement for repeated use.

Used in

Common applications for PROTO
Automotive assembly — PROTO J72102 impact socket set for fastening lug nuts on production lines
Heavy equipment maintenance — PROTO J3772T flare nut wrench for hydraulic line fittings on excavators
General industrial repair — PROTO J795SA adjustable wrench set for tightening bolts on conveyor systems
Aerospace manufacturing — PROTO J5240A slotted bit socket for adjusting fasteners in confined spaces
Oil and gas pipeline work — PROTO J5438 12-point socket for valve assembly in refineries
Construction site toolkits — PROTO J8179-T500 double box wrench for structural steel bolting

PROTO Products

3G Electric supplies PROTO hex bit sockets. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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