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Manufacturer Resources
Product Specs
- Country Of Origin:
- United States (US)
- Product Subgroup:
- General Terminals
- Product Type:
- Vinyl Insulated Ring Terminal
- Standards:
- UL E9809
- Wire Size:
- 18-14 AWG
- Department:
- Electrical
- Product Group:
- Wire Termination
- Product Color:
- Blue
- Product Material:
- Copper
Sta-Kon RB857-200M – Frequently Asked Questions
1) What wire gauge does the Sta-Kon RB857-200M ring terminal accept?
The RB857-200M takes 18 to 14 AWG conductor. That is the blue insulation band range, so if you are terminating 16 AWG control wire or 14 AWG branch wire, this is the right barrel. For 22-16 AWG you need a red terminal, and for 12-10 AWG a yellow one.
2) Is the Sta-Kon RB857-200M UL listed?
It carries UL file E9809. For MRO and institutional work where terminations have to be listed components, that is the reference to put on the submittal.
3) Why choose a ring terminal instead of a spade or fork terminal on a panel?
A ring tongue is a closed loop, so it cannot vibrate off the stud if the screw backs out slightly. Fork terminals slide off under a loosened screw, which is why many panel and equipment specs call for rings on anything that sees vibration or periodic torque checks. The trade-off is that you have to fully remove the screw to land the RB857-200M, where a fork only needs it loosened.
4) What is the barrel made of, and does it matter for aluminum conductor?
The barrel is copper, so use it on copper conductor only. Landing bare copper crimps on aluminum wire sets up galvanic corrosion at the joint; aluminum needs an AL9CU rated connector with an oxide inhibitor instead.
5) Do I need a special crimp tool for these insulated ring terminals?
Use an insulated-terminal crimper, the kind with color-coded nests. Match the blue nest to this terminal since the insulation is blue for the 18-14 AWG range. A bare-terminal or plier-style crimp will split the vinyl sleeve and leave an unreliable joint.
6) What does the Mylar packaging on the Sta-Kon RB857-200M mean for a contractor buying in bulk?
These are supplied on a Mylar strip rather than loose in a bag. Strip packaging is what feeds a production or bench crimp tool, so it suits shops doing repetitive panel work; if you are doing one-off service calls, loose-pack terminals are easier to pull from a pouch.
7) Where is the Sta-Kon RB857-200M made?
Manufactured in the United States, which is what you need to confirm for Buy American or federally funded project submittals.
8) What is the exact part number to order for this blue No. 6 ring terminal?
Order Sta-Kon part number RB857-200M. That single MPN covers the blue 18-14 AWG, No. 6 stud, vinyl insulated ring terminal on Mylar strip.
How fast can I get the Sta-Kon RB857-200M 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 RB857-200M come with a warranty?
Absolutely. The Sta-Kon RB857-200M 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 RB857-200M?
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 RB857-200M 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.