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Manufacturer Resources
Product Specs
- Division:
- Electrical H1
- Product Group:
- Fasteners
- Sub Division:
- Electrical-E H2
- Department:
- Electrical
- Product Subgroup:
- Screws
Metallics TP139SBC – Frequently Asked Questions
1) What thread size and length is the Metallics TP139SBC tamper-resistant screw?
The TP139SBC is a 3/8-16 x 2 inch screw, so it takes a 3/8-16 tapped hole or nut and gives 2 inches of length. The 16 is threads per inch, which is the coarse series for 3/8 diameter, so it will not thread into a 3/8-24 fine-thread hole.
2) What kind of driver do I need for the Metallics TP139SBC button head screw?
It's a hex pin head, so you need a pin-in-hex (tamper-resistant hex) bit sized for the recess, not a standard Allen key. A plain hex key will not seat because of the center pin. Order the matching pin-hex driver bits with the screws if your crew doesn't already carry them.
3) Why use a pin-in-hex screw instead of a standard hex socket screw on exposed electrical equipment?
The pin in the center of the hex recess blocks a common Allen wrench, so covers, enclosures, panels and fixture housings can't be opened with tools anyone carries. That's the point of the TP139SBC: it's a security fastener for public-facing or outdoor-mounted gear where you want removal limited to whoever has the pin-hex bit. If tamper resistance isn't a requirement, a plain socket or hex-head machine screw in 3/8-16 x 2 does the same mechanical job for less hassle at install.
4) Is the TP139SBC a machine screw or a self-tapping screw?
It's a machine screw. The threads run the 3/8-16 machine series, meaning it needs a pre-tapped 3/8-16 hole or a nut behind the material. It will not cut its own thread in sheet metal the way a self-drilling or tapping screw does, so drill and tap, or plan on a nut on the back side.
5) How many Metallics TP139SBC screws come in a box?
They ship 100 pieces per box. For a job that needs a small count, plan on the full 100-piece quantity being the unit, and keep the spares with the pin-hex bit so the same security head is available the next time the enclosure has to be opened.
6) What is the part number to reorder the Metallics 3/8-16 x 2 button head pin-hex security screw?
Order it as Metallics TP139SBC. That designation covers the 3/8-16 x 2 button head hex pin tamper-resistant machine screw in the 100-piece box.
How fast can I get the Metallics TP139SBC delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
continental
U.S.
Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Metallics TP139SBC come with a warranty?
Absolutely. The Metallics TP139SBC is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Metallics TP139SBC?
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installation tips, and troubleshooting. Contact Us
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