AuInLand trailer coupler pin, 5/16-inch diameter
Product description
Size and fit
When you need to keep a trailer coupler latch or another compatible fitting secured, this AuInLand trailer coupler pin offers a simple pin-and-retainer setup. It measures 5/16 inch in diameter and 2-3/4 inches long, so the first decision is whether those dimensions match the opening and hardware you intend to use it with.
The pack contains 20 pins, each with an extended wire and quick-release ring. Would a tether make a small pin easier to keep track of when it is removed? That’s the practical idea here, though the listing doesn’t specify how the ring attaches to your particular equipment.
The described uses include trailer couplers, trailer jack wheels and pintle hooks, as well as attachments around farms, lawns and gardens, trailer hitch receivers and other locking applications. The pin is inserted into the coupler latch, then the square retainer clips over its end. A specific fit for every receiver or attachment isn’t established, so matching the size and intended use matters more than relying on the broad list of applications.
Pros
The main convenience is having the pin and its retainer connected by a 10.55-inch stainless steel wire, with a quick-release ring at the end. That can be useful during a routine hitch-up: remove the pin to open the latch, then keep it tethered nearby rather than setting a loose piece of hardware down. The long-ear spring retainer is intended to help prevent the pin from popping out, and the listing describes the pin as lightweight and portable.
The pin itself is described as solid steel with a galvanized surface, while the extended wire is stainless steel. That distinction is worth noting: the listing claims the galvanized surface resists rust and corrosion, but doesn’t provide a coating specification or other durability details. Without hands-on testing, it’s sensible to treat the stated materials and retention design as the buying information available, not as proof of performance in every environment.
It makes sense for you if you need several pins for compatible locking points and want a tethered retainer. It is not for you if the application requires a pin intended to bear a load, the product notes that it may not be suitable for bearing use.
Spec sheet
- Type: Trailer coupler / shaft locking pin
- Diameter: 5/16 inch (8 mm)
- Length: 2-3/4 inches (70 mm)
- Pack quantity: 20
- Pin material: Solid steel wire
- Surface: Galvanized
- Wire: Stainless steel, 10.55 inches long
- Retainer: Long-ear spring clip with square retainer, quick-release ring
What I’d decide
For a trailer owner replacing missing pins or keeping spares for several compatible fittings, a 20-piece pack with attached wires is a practical format, provided the measurements match. It also makes more sense than buying a bare pin if keeping the retainer connected is useful in your setup. On the other hand, someone who needs a single pin, needs a confirmed fit for a specific coupler, or needs hardware for bearing use should look for a product whose size and intended load are explicitly suited to that job. Here, the key decision is straightforward: match the dimensions and use it for retention, not as a load-bearing component.