Facom Bit Socket - 3/8 Inch Drive - 4mm
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Blueperry agriculture (UK)Facom Bit Socket 3/8" Hex 4Mm Jt4
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Product Information
Full details
The Facom JT.4 is a professional-grade 3/8-inch drive hexagon bit socket specifically designed for mechanics and technicians who require high-precision fastening in tight spaces. Its primary benefit is the specialized OGV profile, which ensures superior torque application and bolt head protection, though users should note that as a 4mm metric tool, it is strictly intended for small-scale precision fasteners and is not suitable for high-torque heavy machinery applications.
All features
| Model Part Number | JT.4 |
|---|---|
| Brand | Facom |
Extended Product Information
FAQs
Can I use this socket with an impact gun?
No, this socket is designed for hand tools only. Impact forces may damage the bit tip.
What does the OGV profile do?
The OGV profile applies torque to the sides of the fastener rather than the corners, significantly reducing the risk of rounding off the bolt head.
Is this tool compatible with a 1/2-inch drive ratchet?
No, it requires a 3/8-inch drive. You would need a 1/2-inch to 3/8-inch adapter to use it with a 1/2-inch tool.
How do I clean the phosphate tip?
Use a light solvent or a soft wire brush if debris is stuck in the tip, then wipe clean with an oily rag.
What is the total length of the JT.4?
The total length is 45mm, with a 15mm bit section.
Troubleshooting
Socket slips on the bolt head
Ensure the 4mm socket is the correct size for the bolt and that it is pressed firmly into the head before applying torque.
Socket is stuck in the ratchet
Check the ratchet's release mechanism; if it is stuck due to grit, clean the square drive and the ball detent with a light solvent.
Pros and Cons
Pros
- Superior OGV profile prevents fastener damage
- Professional-grade corrosion resistance from chrome finish
- Phosphate tip provides excellent grip on screw heads
- Compact 45mm design allows access in confined engine bays
- High-quality construction ensures long service life
Cons
- Limited to 4mm metric fasteners only
- Not intended for high-impact or heavy-duty industrial torque
- Phosphate tip may show cosmetic wear after heavy use
- Requires a 3/8-inch drive handle, not compatible with 1/4-inch kits
Setup, Compatibility & Care
To ensure the longevity of your JT.4 bit socket, always pair it with a standard 3/8-inch square drive tool. When in use, ensure the socket is fully seated on the fastener head before applying force to prevent cam-out. For care, wipe the chrome body with a clean, dry cloth after use to remove grease and oil. While the finish is corrosion-resistant, storing the bit in a moisture-controlled toolbox drawer will prevent the phosphate tip from surface oxidation over time. Avoid using this socket with impact wrenches, as the mechanical shock can damage the bit geometry.