Identify CURT Hitch Pins, Receiver Locks & Retaining Clips

Recognize the pin type by its retention

Conceptual pin designs, not scaled drawings or measurement templates.

Identify the original CURT pin in five steps

1. Measure the removed pin or pin hole directly rather than estimating from the receiver class label.
2. Check the receiver and accessory width so a replacement will reach fully through and accept its retaining device.
3. Look for the circular groove of CURT 21505 or 21583, the adapter sleeve of 21502, or the keyed head of 23021.
4. Inspect the original clip or lock for corrosion and damage; don't substitute an unretained bolt or a loosely fitting pin.
5. Confirm the manufacturer's intended application and the lowest rated towing component before towing.

Match CURT receiver pins by exact MPN

Listed receiver sizes are model-specific applications, not proof that the pin reaches through every hitch and accessory combination.

Check the matching pin photographs and descriptions

Use these CURT part numbers to compare the old pin and check each listing for its condition and availability.

Small receiver pins and adapter sleeves

CURT 21401 is a simple half-inch receiver pin; 21502 adds a removable sleeve for the specified pin-hole arrangement.

CURT 21401 — ½-inch pin for small receiversSmaller half-inch bent steel hitch pin for a 1¼-inch receiver. Look for the separate R-clip rather than a key-operated lock.Check listing and availability

CURT 21502 — ½-inch pin with adapter sleeveThe removable adapter sleeve distinguishes this combination from a simple full-diameter ⅝-inch pin. Check both receiver and accessory hole diameter.Check listing and availability

Full-size and heavy-duty receiver pins

Standard bent and grooved designs differ in receiver application and retaining clip access. Compare the actual reach as well as the diameter.

CURT 21505 — Grooved ⅝-inch receiver pinLook for the circular groove near the tip and a separate clip. Intended for a compatible two-inch receiver.Check listing and availability

CURT 21506 — Heavy-duty extended receiver pinThe extended pin reaches across certain larger receiver tubes. CURT identifies a 21,000-lb GTW pin rating; it does not increase the hitch or vehicle rating.Check listing and availability

CURT 21580 — Bent standard receiver pinA conventional bent pin with retainer clip rather than a key-operated lock or a grooved pin end.Check listing and availability

CURT 21581 — Packaged standard receiver pinThe packaged companion to the standard ⅝-inch receiver pin. Similar appearance does not establish the same packaging or pin reach.Check listing and availability

CURT 21583 — Grooved extended receiver pinThe groove near the retaining end and larger receiver application distinguish it from the standard 21580/21581 pin.Check listing and availability

Identify the receiver locking head

The CURT 23021 deadbolt lock has a bent ⅝-inch pin with a keyed locking head and dust cap rather than a loose retainer clip.

CURT 23021 — Deadbolt keyed receiver lockA lock with a keyed Deadbolt-style head rather than an ordinary clip. It is designed for compatible larger receiver sizes; check actual width before replacing it.Check listing and availability