You may also like
Screws 1/4-20 x 1/2 RH CD MS St-Zn (1000 pcs)
Manufacturer Resources
Product Specs
- Division:
- Electrical H1
- Product Group:
- Fasteners
- Sub Division:
- Electrical-E H2
- Department:
- Electrical
- Product Subgroup:
- Screws
Metallics RM99-1M – Frequently Asked Questions
1) Will the RM99-1M 1/4-20 x 1/2 screw work with strut channel nuts and electrical enclosures?
The thread is right, the length is the thing to check. At 1/2 inch of overall screw length, the usable grip after the head is short, so it suits thin material: a fixture ear, a cover plate, or a bracket into a 1/4-20 channel nut or a tapped enclosure boss. Stack a thicker assembly or add washers and you will run out of thread, in which case go to a longer 1/4-20 machine screw.
2) What head style and driver do the RM99-1M 1/4-20 screws use?
Round head. The RM99-1M is a round head machine screw, which seats on the surface rather than sitting flush, so it needs a clearance hole and not a countersink. If your part is countersunk for a flat head, this is the wrong screw.
3) Are these Metallics 1/4-20 screws plated for corrosion resistance, and can I use them outdoors?
They are steel with a zinc plating, which is a general indoor and dry-location finish. Zinc plated steel will corrode in wet, coastal, or chemically aggressive locations, so for exterior or damp runs step up to a stainless 1/4-20 machine screw instead.
4) What is the difference between a machine screw like this and a self-tapping sheet metal screw?
A machine screw has a uniform straight thread and no cutting point, so it needs a mating thread already there: a nut, a channel nut, or a tapped hole. The RM99-1M is that type. A sheet metal or self-drilling screw forms its own thread in unthreaded material. If you are fastening into bare sheet with no nut behind it, this screw is not the right choice.
5) How many screws come in the Metallics RM99-1M box?
One thousand pieces per box. That bulk count is aimed at electrical contractors and MRO stock crews who are consuming 1/4-20 hardware continuously on fixture, strut, and enclosure work rather than buying by the handful.
6) What is the Metallics part number for the 1/4-20 x 1/2 round head zinc machine screw?
Order it as Metallics RM99-1M. That number covers the 1/4-20 x 1/2 inch round head steel machine screw with zinc plating in the 1000 piece quantity.
How fast can I get the Metallics RM99-1M 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 RM99-1M come with a warranty?
Absolutely. The Metallics RM99-1M 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 RM99-1M?
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 RM99-1M 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.