You may also like
Screws 1/4-20 x 1-1/2 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 RM103-1M – Frequently Asked Questions
1) What thread size and length are the Metallics RM103-1M machine screws?
They are 1/4-20 by 1-1/2 inches. That is a 1/4 inch diameter screw with 20 threads per inch, UNC coarse, so it mates with a 1/4-20 tapped hole or a standard 1/4-20 nut. The 1-1/2 inch length is measured under the round head, which is the usable grip plus whatever thread you need protruding for the nut.
2) Is the RM103-1M a machine screw or a sheet metal screw?
Machine screw. The RM103-1M has a straight 1/4-20 machine thread with a blunt end, so it needs a tapped hole, a nut, or a threaded channel insert. It will not cut its own thread in sheet metal the way a self-tapping screw does.
3) What driver do I need for these 1/4-20 round head screws?
They are combination drive (CD), meaning the head takes either a flat blade or a Phillips bit. Handy on electrical work where you are already carrying a 10-in-1 and do not want to switch tips between the screw and the device terminals.
4) Are these screws corrosion resistant enough for outdoor or damp locations?
The RM103-1M is steel with zinc plating. Zinc plate is a light sacrificial coating suited to dry indoor and protected locations. For wet, exterior, coastal, or corrosive environments, specify stainless steel or hot dip galvanized fasteners instead.
5) Will a 1/4-20 round head machine screw work with strut channel and spring nuts?
Yes. Strut channel nuts and spring nuts are commonly tapped 1/4-20, and this screw's 1/4-20 machine thread mates with them directly. At 1-1/2 inches of length under the head, you have room for the channel lip plus a bracket or clamp of normal thickness before you run out of thread.
6) How many screws come in a box of Metallics RM103-1M?
1000 pieces per box. It is a bulk contractor pack, sized for shops that are hanging strut, mounting boxes, or assembling panels in volume rather than buying a handful at a time.
7) Do these screws come with nuts or washers?
No. The RM103-1M box is screws only, 1000 of them. If the connection is not into a tapped hole or a channel nut, order 1/4-20 hex nuts and any flat or lock washers separately.
8) Why choose a round head instead of a flat head screw here?
A round head sits on top of the surface and bears on a wider footprint, so it is the choice when there is no countersink in the part. If the drawing calls for the fastener to sit flush in a countersunk hole, you need a flat head instead, not the RM103-1M.
How fast can I get the Metallics RM103-1M 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 RM103-1M come with a warranty?
Absolutely. The Metallics RM103-1M 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 RM103-1M?
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 RM103-1M 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.