# Strut channel nuts (spring nuts) for 1-5/8 in channel: threads, thickness and loads

> What size are Unistrut / B-Line channel nuts and what loads do they take?

- Category: Hardware › Framing
- Kind: Standard part
- Basis: Unistrut Nuts & Hardware catalog pages; Eaton B-Line channel nuts section. Nut width, length and groove sizes are not published, so no file
- Page: https://xemstudio.com/objects/strut-channel-spring-nuts/ · JSON: https://xemstudio.com/api/geometry?object=strut-channel-spring-nuts · Plain text: https://xemstudio.com/objects/strut-channel-spring-nuts/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/)

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

## Notes

- A channel nut is a rectangular nut with two grooves across its top: it goes in through the 7/8 in slot, is turned 90°, and the grooves seat on the inturned lips. A spring under it holds it up against the lips while you fit the bolt.
- Neither Unistrut nor B-Line publishes the nut's width, length, groove spacing or depth, so Xem draws no nut file: measure a real nut, or design around the channel lip and slot numbers on the channel page.
- Deep channels (1-5/8, 1-3/8, 2-7/16, 3-1/4 in) and shallow ones (13/16, 7/8, 1 in) use different spring lengths; check the nut family against the channel height.
- Design loads below are the maker's, with a safety factor of at least 3, for 12 ga deep channel.

## Sizes

| thread | nut thickness (B-Line) | pull-out (12 ga deep) | slip (12 ga deep) | recommended bolt torque |
|---|---|---|---|---|
| 1/4-20 | 1/4 in (6.3 mm) | 600 lb | 300 lb | 6 ft·lb (8 N·m) |
| 5/16-18 | — | 800 lb | 500 lb | 11 ft·lb (15 N·m) |
| 3/8-16 | 3/8 in (9.5 mm) | 1,000 lb | 800 lb | 19 ft·lb (26 N·m) |
| 1/2-13 | 1/2 in (12.7 mm) | 2,000 lb | 1,500 lb | 50 ft·lb (68 N·m) |
| 5/8-11 | — | 2,500 lb | 1,500 lb | 100 ft·lb (136 N·m) |
| 3/4-10 | — | 2,500 lb | 1,700 lb | 125 ft·lb (170 N·m) |

## Where the files are

- Unistrut (Atkore): [1-5/8" Framing System catalog: Nuts & Hardware (threads, design loads, bolt torque)](https://unistrut.biz/content/CatalogPDFs/1-5-8-ChannelNutsHardware.pdf) — web — Publisher's page; dimensions are facts
- Eaton B-Line: [B-Line series strut systems: Channel nuts & hardware section (thread, nut thickness)](https://media.cityelectricsupply.com/media/blinebyeaton/n225-zn-1-2/documents/bline_brochure_929743.pdf) — web — Publisher's page; dimensions are facts

## Questions

**Does Unistrut publish channel nut dimensions?**

No: only thread size, weight and loads. B-Line prints the nut thickness (1/4, 3/8, 1/2 in for 1/4-20, 3/8-16, 1/2-13).

**What holds a channel nut in strut?**

Two grooves across the nut seat on the channel's 9/32 in deep inturned lips; the bolt pulls the nut up against them.

## Fits with

- [Strut channel, 1-5/8 in (Unistrut / B-Line): profile, lips, slots and hole patterns](https://xemstudio.com/objects/strut-channel-1-5-8/)