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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 RM99-5M – Frequently Asked Questions
1) Will a 1/4-20 x 1/2 inch machine screw work in Unistrut channel nuts and electrical enclosures?
Yes. 1/4-20 is the standard thread on strut channel nuts and on most tapped holes in panel boxes, enclosure covers and device mounting rails, and the RM99-5M carries that thread. The 1/2 inch length gives enough grip for a channel nut or a tapped flange while staying short enough not to bottom out behind the channel.
2) Is this a machine screw or a self-tapping sheet metal screw?
Machine screw. The RM99-5M has a uniform 1/4-20 machine thread with a blunt end, so it needs a tapped hole or a nut, it will not cut its own threads in sheet metal. If you are fastening into unthreaded sheet, you want a self-drilling or sheet metal screw instead.
3) How many screws come in a box of Metallics RM99-5M?
One RM99-5M carton holds 5,000 pieces of the 1/4-20 x 1/2 inch round head machine screw. That is a bulk production pack, sized for shops running strut, box and panel work continuously rather than a single service call.
4) Is the Metallics RM99-5M screw okay for outdoor or damp locations?
It is zinc plated steel, which is a mild corrosion coating meant for dry indoor and protected service. For wet locations, exterior runs or corrosive environments, step up to a stainless steel 1/4-20 machine screw instead; zinc plating will eventually bloom and rust in standing moisture.
5) Can I drive the RM99-5M with a Phillips bit, or do I need a flat blade?
Either one. The head is a combination drive, slotted and Phillips in the same recess, so a #2 Phillips bit or a flat blade screwdriver both seat. That matters on panel work where you are already holding one driver.
6) What does the round head on a 1/4-20 machine screw mean for the mounting surface?
A round head sits on top of the material rather than sinking in, so the hole stays a plain clearance hole, no countersink needed. It also gives a wider bearing surface than a flat head. If you need the fastener flush with the panel face, a flat head machine screw is the one to specify.
How fast can I get the Metallics RM99-5M 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 RM99-5M come with a warranty?
Absolutely. The Metallics RM99-5M 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 RM99-5M?
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 RM99-5M 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.