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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 TP421SRC – Frequently Asked Questions
1) What thread size are the Metallics TP421SRC screws, and will they take a standard 1/4-20 nut?
The TP421SRC is a 1/4-20 machine screw, so it mates with any standard 1/4-20 internal thread, nut, or tapped hole. Machine screw thread, not a self-tapping or wood thread, so the hole has to be tapped or a nut used behind it.
2) Do I need a special bit to install or remove the Metallics TP421SRC one-way screw?
Installation only needs a standard flat blade driver. The head is a one-way (clutch) tamper-resistant design: the slot ramps drive the screw in but cam out when you try to back it out, so it will not come loose with a normal screwdriver. Removal takes a dedicated one-way screw extractor or drilling the head off. Plan on treating these as permanent in cover plates, signage, and enclosure fastening.
3) How many screws come in a pack of Metallics TP421SRC?
They ship 100 pieces to the pack under part number TP421SRC. For an MRO or facilities buyer standardizing tamper-resistant fastening across panels or plates, that is one box per 100 fixing points, and the pack is the order unit.
4) Are the Metallics TP421SRC screws round head or flat head, and do they need a countersunk hole?
Round head. They sit proud on the surface, so the hole is a plain clearance hole with no countersinking required. If your panel or plate is countersunk for a flush finish, a round head one-way screw is the wrong profile for it.
5) Are Metallics TP421SRC tamper-resistant screws suitable for electrical enclosure and cover plate work?
That is the intended use. Metallics catalogs the TP421SRC as electrical fastening hardware, and a 1/4-20 one-way machine screw is what gets specified for securing covers, plates, and panels in public or tenant-accessible areas where you do not want them opened with a common screwdriver.
How fast can I get the Metallics TP421SRC 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 TP421SRC come with a warranty?
Absolutely. The Metallics TP421SRC 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 TP421SRC?
You can call, text, or email our expert support team for fast answers. We’re here to help with
product
selection,
installation tips, and troubleshooting. Contact Us
Why buy the Metallics TP421SRC from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support,
and
rewards on
every order.
Our team is always ready to help you choose the right product for your project.