# Trailer hitch receiver, 2-1/2 in square (SAE J684 classes)

> What are the dimensions of the Trailer hitch receiver, 2-1/2 in square?

- Category: Tools & garage › Hitch receivers
- Kind: Modern device
- Basis: Manufacturer specifications (Lippert (CURT))
- Page: https://xemstudio.com/objects/trailer-hitch-receiver-2-1-2-inch/ · JSON: https://xemstudio.com/api/geometry?object=trailer-hitch-receiver-2-1-2-inch · Plain text: https://xemstudio.com/objects/trailer-hitch-receiver-2-1-2-inch/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

## Overall (mm)

| length | width |
|---|---|
| 63.5 | 63.5 |

**Exact dimensions.** True size, with no printing tolerance added.

## Notes

- A 2-1/2 in receiver takes a 2-1/2 in square shank and a 5/8 in hitch pin, per CURT/Lippert's class and pin guides.
- Rated weights depend on the specific hitch; the class figures are the maker's typical ranges.
- No CAD file: the maker publishes only overall sizes, and a plain box or cylinder is not useful design geometry. The table is the published data; parts with real geometry have their own pages.

## Sizes

| dimension | value |
|---|---|
| Receiver size | 2-1/2 × 2-1/2 in (63.5 mm square) |
| Hitch classes | Class 5 Commercial Duty (18,000–20,000 lb GTW, 2,700 lb TW) |
| Hitch pin diameter | 5/8 in (15.88 mm) |
| Minimum usable pin length (excl. handle) | 3-3/8 in (85.72 mm) |

## Where the files are

- Lippert (CURT): [A Beginner's Guide to Hitch Classes](https://www.lippert.com/blog/a-beginners-guide-to-hitch-classes) — web — Publisher's page; dimensions are facts
- Lippert (CURT): [Guide to Hitch Pin Sizes](https://www.lippert.com/blog/guide-to-hitch-pin-sizes) — web — Publisher's page; dimensions are facts

## Questions

**What pin fits a 2-1/2 in receiver?**

A 5/8 in (15.88 mm) pin with at least 3-3/8 in usable length.

## Fits with

- [Trailer hitch receiver, 1-1/4 in square (SAE J684 classes)](https://xemstudio.com/objects/trailer-hitch-receiver-1-1-4-inch/)
- [Trailer hitch receiver, 2 in square (SAE J684 classes)](https://xemstudio.com/objects/trailer-hitch-receiver-2-inch/)
- [Trailer hitch receiver, 3 in square (SAE J684 classes)](https://xemstudio.com/objects/trailer-hitch-receiver-3-inch/)