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Manufacturer Resources
Product Specs
- Country Of Origin:
- United States (US)
- Product Subgroup:
- General Terminals
- Product Type:
- Vinyl Insulated Locking Fork Terminal
- Voltage Rating:
- 600 V
- Wire Size:
- 22-16 AWG
- Department:
- Electrical
- Product Group:
- Wire Termination
- Product Color:
- Red
- Product Material:
- Copper
Sta-Kon RA2257ML – Frequently Asked Questions
1) What wire gauge does the Sta-Kon RA2257ML fork terminal accept?
The RA2257ML is sized for 22 to 16 AWG stranded or solid copper conductor. That's the small control-wire range, so it suits thermostat wiring, control panels, and low-current device terminations. Anything 14 AWG or larger needs a different barrel size, and the red insulation is the standard color code for that 22-16 range.
2) Will this Sta-Kon fork terminal fit a No. 10 screw stud?
Yes. The RA2257ML is built for a #10 stud or screw size, which covers most terminal blocks, breaker lugs, and device screws in that class. The fork (spade) tongue slides under a loosened screw instead of requiring the screw to come all the way out, which is why it's quicker than a ring on a crowded terminal strip.
3) What makes this a locking fork terminal instead of a plain spade?
The tongue on the RA2257ML has locking tangs formed into the fork arms. Once the screw is tightened down, those tangs bite and resist the terminal backing out under vibration, so it behaves closer to a ring terminal while still installing like a spade. For panels on rooftop equipment or anything that shakes, that's the reason to pick this over a standard non-locking fork.
4) Is this terminal rated for 600 volt circuits?
The insulation on the RA2257ML carries a 600 V rating, so it's usable on standard commercial branch circuits and control wiring up to that level. The insulation itself is vinyl with a Mylar liner inside the barrel, which is what holds the voltage rating and keeps the sleeve from splitting when the barrel is crimped.
5) Should I use a fork terminal or a ring terminal on a control panel terminal strip?
Use the fork where you need to land or pull a wire without removing the screw entirely, which is most terminal strips and relay bases where screws are captive or hard to reach. Use a ring where code or spec requires a connection that cannot slip off even with the screw loose. The RA2257ML narrows that gap: it's a #10 fork with locking tangs, so it holds under vibration better than a plain spade while still giving you the slide-in install.
6) What is the Sta-Kon RA2257ML terminal barrel made of?
Copper, which is the right match for copper conductor, no dissimilar-metal concern at the crimp. It needs a proper insulated-terminal crimp tool sized for the 22-16 AWG range; pliers will not give you a gas-tight barrel and the joint will heat up.
7) What is the manufacturer part number for this red 22-16 AWG locking fork terminal?
RA2257ML is the Sta-Kon part number. Order against that designation: the RA prefix is the insulated locking fork line, and the ML indicates the Mylar-lined vinyl insulation.
How fast can I get the Sta-Kon RA2257ML 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 RA2257ML come with a warranty?
Absolutely. The Sta-Kon RA2257ML 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 RA2257ML?
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installation tips, and troubleshooting. Contact Us
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