Identify CURT Hitch Pins & Locks

To identify a missing hitch pin or lock, first measure the pin's actual diameter and the receiver opening. A half-inch pin for a small receiver looks similar to a five-eighth-inch pin until they are side by side. The grooved clip end, removable sleeve and keyed deadbolt head are further clues for matching a CURT replacement.

Recognize the pin type by its retention

Standard pin and clip A bent steel pin uses a separate retainer clip. Match the pin diameter and usable reach.

Adapter sleeve pin CURT 21502 uses a half-inch pin and a removable sleeve for compatible larger pin holes.

Keyed receiver lock CURT 23021 uses a keyed deadbolt head rather than a loose clip. Confirm lock reach and accessory fit.

Conceptual pin designs, not scaled drawings or measurement templates.

Pin diameter and receiver size are separate dimensions. Smaller 1¼-inch receivers commonly use ½-inch pins; compatible larger receivers often use ⅝-inch pins. Some receiver extensions and specialty accessories require a different usable pin length, so do not choose by diameter alone.

Identify the original CURT pin in five steps

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

Safety and retention. A receiver pin must pass through the intended shank and receiver holes and be fully retained by its clip or lock. Follow the hitch and accessory manufacturer's instructions; never assume an incorrect diameter or missing clip is acceptable.

Match CURT receiver pins by exact MPN

CURT MPN	Diameter	Receiver application	Retention style
21401	½ in	1¼ in	Bent pin with retaining clip
21502	½ in; ⅝-in sleeve	1¼- or 2-in matched pin hole	Removable adapter sleeve
21505	⅝ in	2 in	Grooved clip end
21506	⅝ in	2½ or 3 in	Extended grooved pin; clip
21580	⅝ in	2 or 2½ in	Standard clip retention
21581	⅝ in	2 or 2½ in	Packaged pin and clip
21583	⅝ in	2 or 2½ in	Grooved clip end
23021	⅝ in	2, 2½ or 3 in	Keyed locking head and protective cap

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 receivers catalog product photograph

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 sleeve catalog product photograph

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 pin catalog product photograph

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 pin catalog product photograph

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 pin catalog product photograph

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 pin catalog product photograph

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 pin catalog product photograph

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 lock catalog product photograph

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

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Identify CURT Hitch Pins, Receiver Locks & Retaining Clips

Recognize the pin type by its retention

Identify the original CURT pin in five steps

Match CURT receiver pins by exact MPN

Check the matching pin photographs and descriptions

Small receiver pins and adapter sleeves

Full-size and heavy-duty receiver pins

Identify the receiver locking head

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Inventaire de pièces détachées pour VR, nouveau et mis à jour – Consultez-le régulièrement

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