CURT Coupler Safety Pins: Diameter, Length & Chained Versions
A missing retaining pin can leave a trailer-coupler latch or jack-foot connection unsecured. CURT offers zinc-plated safety pins in 1/4-, 5/16- and 3/8-inch diameters, with different usable lengths and optional 12-inch tethers. Match the existing pin hole, installed clearance and clip engagement rather than choosing a pin by appearance.
Choose by the receiving hole and retainer
1/4-inch pins · 2-3/4-inch length
25080 is the basic pin. 25012 adds a 12-inch tether chain; 25013 is the packaged chained model. They all use a square wire retaining clip.
5/16-inch pins · 3-inch length
25010 and packaged 25011 have no tether. 25034 and packaged 25035 include the 12-inch chain. Check that the larger shaft fits the original latch hole.
3/8-inch pin · 2-3/4-inch length
28278 is the unchained 3/8-inch-diameter option in this comparison. It is not a substitute for a 1/4- or 5/16-inch hole without manufacturer approval.
Do not confuse pin roles
These are small, straight safety pins for appropriate coupler latches, jack legs and similar components. A hitch-receiver pin secures a ball mount or receiver accessory and is selected separately.
CURT safety pin size and model chart
| CURT MPN | Diameter | Pin length | Tether chain | Version |
|---|---|---|---|---|
| 25080 | 1/4 in | 2-3/4 in | No | Unchained pin |
| 25012 | 1/4 in | 2-3/4 in | 12 in | Chained version |
| 25013 | 1/4 in | 2-3/4 in | 12 in | Packaged chained version |
| 25010 | 5/16 in | 3 in | No | Unchained pin |
| 25011 | 5/16 in | 3 in | No | Packaged unchained version |
| 25034 | 5/16 in | 3 in | 12 in | Chained version |
| 25035 | 5/16 in | 3 in | 12 in | Packaged chained version |
| 28278 | 3/8 in | 2-3/4 in | No | Unchained pin |
A coupler safety pin must fit the original attachment hole and engage its retainer. The optional tether chain does not replace proper coupler latching or trailer safety chains.
Before installing a coupler safety pin
- Measure the original coupler latch or jack-leg hole. Use the part's actual shaft diameter; 1/4 and 5/16 inch are not equivalent.
- Check the usable pin length so the shaft passes completely through the connection and leaves room for the square wire retainer.
- Inspect the surrounding latch, keeper and retaining clip for distortion, corrosion or worn holes.
- Decide whether a 12-inch tether chain helps prevent loss. The chain is a convenience attachment, not the mechanism that secures the pin.
- Before towing, confirm the coupler is fully seated and latched and the pin's wire retainer is completely engaged. Follow the trailer and coupler manufacturers' instructions.
Shop exact CURT coupler safety pins
Select the specific model to check further product details and online availability.
Other towing safety parts
For the secondary connection between the trailer frame and tow vehicle, compare CURT safety-chain and cable assemblies. A coupler latch pin is not a trailer safety chain or cable.
To secure a ball mount to a hitch receiver, use our separate CURT hitch-receiver pin and lock guide.
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