Xem Studiomeasured geometryLibrary › Hardware › Framing ·
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? · 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
Also called: unistrut nut, unistrut spring nut, strut nut, channel nut 1/2-13, p1010, unistrut nut size, b-line n225, strut spring nut dimensions
Exact dimensions. True size, with no printing tolerance added.
- sizes
- 6 in table
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.
Strut channel nuts (spring nuts) for 1-5/8 in channel: threads… size chart
| 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
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Unistrut (Atkore) | 1-5/8" Framing System catalog: Nuts & Hardware (threads, design loads, bolt torque) | web | Publisher's page; dimensions are facts |
| Eaton B-Line | B-Line series strut systems: Channel nuts & hardware section (thread, nut thickness) | web | Publisher's page; dimensions are facts |
Xem scan
File coming
No downloadable true-size file yet: the published figures do not fix the whole shape, and Xem never guesses a number. A measured scan is planned; request it and it moves up.
https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.Plain text: sheet.txt · JSON: /api/geometry?object=strut-channel-spring-nuts
Fits with
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.