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Manufacturer Resources
Product Specs
- Country Of Origin:
- United States (US)
- Product Subgroup:
- General Terminals
- Product Type:
- Nylon Insulated Ring Terminal
- Standards:
- UL E9809
- Wire Size:
- 22-16 AWG
- Department:
- Electrical
- Product Group:
- Wire Termination
- Product Color:
- Red
- Product Material:
- Copper
Sta-Kon RA333M – Frequently Asked Questions
1) What wire gauge does the Sta-Kon RA333M ring terminal take?
The RA333M is sized for 22 to 16 AWG stranded copper conductor, which is the red-coded range in the Sta-Kon color system. If you are terminating 14 or 12 AWG, this barrel will not grip it and you need the next size up (blue, 16-14, or yellow, 12-10).
2) What size stud or screw will the RA333M ring fit over?
The ring tongue is a No. 6 stud size, so it drops over a 6-32 screw or a 6 AWG-stud terminal block post. For 8-32 or 10-32 hardware you want a larger ring tongue in the same 22-16 wire range.
3) Is this Sta-Kon ring terminal UL listed?
Yes. The RA333M carries UL file E9809, which is what an institutional or MRO inspector is usually looking for on panel and control wiring terminations.
4) Will a nylon insulated ring terminal work better than a spade or fork terminal on a panel?
A ring terminal like the RA333M fully captures the stud, so the wire cannot back out if the screw loosens. That is why rings are specified for vibration-prone equipment, motor leads, and anything safety related. A spade or fork terminal only makes sense where you need to slide the connection off without removing the screw entirely, such as frequently serviced terminal strips.
5) Is the RA333M barrel copper or aluminum, and can I use it on aluminum wire?
The barrel is copper, so it is intended for copper conductors only. Terminating aluminum wire in a copper-only lug risks galvanic corrosion and a loose joint over time; use a terminal marked AL9CU or CU/AL for aluminum.
6) Do I need a special crimper for Sta-Kon RA333M terminals?
These are crimped, not soldered, and should be set with a controlled-cycle crimp tool matched to the red 22-16 nest. Pliers or a cheap stamped crimper will under-form the barrel and the UL E9809 listing assumes a proper crimp. Strip to the barrel length, bottom the conductor, and give it a pull test.
7) What does the nylon insulation on this Sta-Kon terminal buy me over vinyl?
Nylon insulation on the RA333M holds up better to abrasion, crushing in a tight raceway, and oils or solvents than a vinyl sleeve, and it resists cracking when the terminal is flexed during install. For control cabinets and equipment wiring where the harness gets handled, that is the practical difference.
8) Are these Sta-Kon terminals made in the USA?
Country of origin on the RA333M is the United States, which matters if you are buying against a Buy American or domestic-preference clause on a government, healthcare, or education project.
9) How do I identify the correct Sta-Kon ring terminal by color on the job?
Red insulation marks the 22-16 AWG range on the RA333M, so an electrician can confirm the right terminal for a given conductor at a glance without pulling the spec sheet. Keep the red, blue, and yellow sizes separated in the kit, since they are easy to mix up once loose.
How fast can I get the Sta-Kon RA333M 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 Sta-Kon RA333M come with a warranty?
Absolutely. The Sta-Kon RA333M 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 Sta-Kon RA333M?
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 Sta-Kon RA333M from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support,
and
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every order.
Our team is always ready to help you choose the right product for your project.