Strut channel nuts (spring nuts) for 1-5/8 in channel: threads, thickness and loads — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/strut-channel-spring-nuts/  (sheet CC BY 4.0)
Basis: Unistrut Nuts & Hardware catalog pages; Eaton B-Line channel nuts section. Nut width, length and groove sizes are not published, so no file
Catalog version: 2026-10-20

Sizes: see table below
- 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.

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)

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Unistrut (Atkore): 1-5/8" Framing System catalog: Nuts & Hardware (threads, design loads, bolt torque) — web — Publisher's page; dimensions are facts — https://unistrut.biz/content/CatalogPDFs/1-5-8-ChannelNutsHardware.pdf
- Eaton B-Line: B-Line series strut systems: Channel nuts & hardware section (thread, nut thickness) — web — Publisher's page; dimensions are facts — https://media.cityelectricsupply.com/media/blinebyeaton/n225-zn-1-2/documents/bline_brochure_929743.pdf

No true-size file yet: the published figures do not fix the whole shape; a measured scan is planned.
API: https://xemstudio.com/api/geometry?object=strut-channel-spring-nuts