Xem Studiomeasured geometryLibrary › Hardware › Framing ·
Strut flat plate fittings, 1-5/8 in: splice, tee and L corner plates (B-Line B129, B141, B341, B133, B143)
What are the dimensions of Unistrut / B-Line strut splice plates, tee plates and corner plates? · Standard part · basis: Eaton B-Line strut fittings catalog section and distributor listings of the same catalog numbers; hole pattern from the B-Line section and the Unistrut P1062 listing
Also called: unistrut splice plate, b129 dimensions, strut splice plate dimensions, unistrut tee plate, strut corner plate, b341 splice plate, p1062 unistrut, strut flat fitting stl, strut plate step, unistrut 4 hole plate
Exact dimensions. True size, with no printing tolerance added.
- length
- 184.1 mm
- width
- 41.3 mm
Notes
- Flat strut fittings are 1-5/8 in wide steel plates with 9/16 in holes on 1-7/8 in centres, the first hole 13/16 in from the end, so a plate with n holes in a row is (n - 1) × 1-7/8 + 2 × 13/16 in long: 3-1/2, 5-3/8 and 7-1/4 in for 2, 3 and 4 holes, which matches the listed lengths.
- Tee (B133) and L corner (B143) plates: overall size and hole count are listed, but the hole layout is not printed, so they are in the table only, with no file. The listings give only overall length, width and hole count; the stem and leg widths of 1-5/8 in and hole positions are taken from the pattern above.
- Thickness is not consistent between sources: Unistrut and most distributor listings say 1/4 in, B-Line's fittings section says 7/32 in. Both are drawn for every plate.
- Corner radii and any chamfers are not printed, so every file has sharp corners. 2-hole B340 (3-1/4 in) and 3-hole B557 (4-7/8 in) do not fit the 13/16 + 1-7/8 pattern, and the 5-hole cross plate and 3-hole corner plate listings are ambiguous, so none of those is drawn.
- Files are Xem-drawn geometry from published numbers, not maker CAD. McMaster-Carr's per-part files are linked, not copied.
Strut flat plate fittings, 1-5/8 in: splice, tee and L corner plates size chart
| fitting | maker part | overall (L × W) | holes | hole pattern | thickness |
|---|---|---|---|---|---|
| 2-hole splice plate | B-Line B129 | 3-1/2 × 1-5/8 in | 2 | 9/16 in (14.3 mm), 1-7/8 in (47.6 mm) apart, 13/16 in (20.6 mm) from the end | 1/4 (listings) or 7/32 in (B-Line section) |
| 3-hole splice plate | B-Line B141 | 5-3/8 × 1-5/8 in | 3 | 9/16 in (14.3 mm), 1-7/8 in (47.6 mm) apart, 13/16 in (20.6 mm) from the end | 1/4 (listings) or 7/32 in (B-Line section) |
| 4-hole splice plate | B-Line B341 | 7-1/4 × 1-5/8 in | 4 | 9/16 in (14.3 mm), 1-7/8 in (47.6 mm) apart, 13/16 in (20.6 mm) from the end | 1/4 (listings) or 7/32 in (B-Line section) |
| 4-hole tee plate | B-Line B133 | 5-3/8 × 3-1/2 in | 4 | 9/16 in (14.3 mm), 1-7/8 in (47.6 mm) apart, 13/16 in (20.6 mm) from the end | 1/4 (listings) or 7/32 in (B-Line section) |
| 4-hole L corner plate | B-Line B143 | 5-3/8 × 3-1/2 in | 4 | 9/16 in (14.3 mm), 1-7/8 in (47.6 mm) apart, 13/16 in (20.6 mm) from the end | 1/4 (listings) or 7/32 in (B-Line section) |
| 1-hole plate | Unistrut P1062 | — | 1 | 9/16 in, 13/16 in from the end | 1/4 in |
| 3-hole corner plate, 5-hole cross plate, 2-hole B340 and 3-hole B557 splice plates | B140, B132, B340, B557 | listed, not drawn | — | do not follow the plain 13/16 + 1-7/8 pattern or the listing is ambiguous | — |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
Free files
★ Free files 6 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| strut-splice-2-hole-1-4in | 2-hole splice plate (B129 layout), 3-1/2 × 1-5/8 in, 6.35 mm (1/4 in) thick, 2 holes 9/16 in on 1-7/8 in centres, 13/16 in from the ends; sharp corners | STEP · STL |
| strut-splice-2-hole-7-32in | 2-hole splice plate (B129 layout), 3-1/2 × 1-5/8 in, 5.56 mm (7/32 in) thick, 2 holes 9/16 in on 1-7/8 in centres, 13/16 in from the ends; sharp corners | STEP · STL |
| strut-splice-3-hole-1-4in | 3-hole splice plate (B141 layout), 5-3/8 × 1-5/8 in, 6.35 mm (1/4 in) thick, 3 holes 9/16 in on 1-7/8 in centres, 13/16 in from the ends; sharp corners | STEP · STL |
| strut-splice-3-hole-7-32in | 3-hole splice plate (B141 layout), 5-3/8 × 1-5/8 in, 5.56 mm (7/32 in) thick, 3 holes 9/16 in on 1-7/8 in centres, 13/16 in from the ends; sharp corners | STEP · STL |
| strut-splice-4-hole-1-4in | 4-hole splice plate (B341 layout), 7-1/4 × 1-5/8 in, 6.35 mm (1/4 in) thick, 4 holes 9/16 in on 1-7/8 in centres, 13/16 in from the ends; sharp corners | STEP · STL |
| strut-splice-4-hole-7-32in | 4-hole splice plate (B341 layout), 7-1/4 × 1-5/8 in, 5.56 mm (7/32 in) thick, 4 holes 9/16 in on 1-7/8 in centres, 13/16 in from the ends; sharp corners | STEP · STL |
Let your AI pull this. Add
Set it 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-flat-plate-fittings
Fits with
Free
Strut channel, 1-5/8 in (Unistrut / B-Line): profile, lips, slots and hole patterns41.27 mm★ 10 filesFreeStrut channel nuts (spring nuts) for 1-5/8 in channel: threads, thickness and loads6 sizes★ sheetFreeStrut 90° angle fittings, 1-5/8 in: B101 and B104 corner angles2 sizes★ sheetFreeStrut U fittings, Z fittings and post bases, 1-5/8 in: B116-12 U-support1 sizes★ sheet
Questions
How long is a 4-hole strut splice plate?
7-1/4 in (184.2 mm): four 9/16 in holes on 1-7/8 in centres, 13/16 in from each end, 1-5/8 in wide.
How thick is a strut splice plate?
1/4 in on Unistrut and most listings, 7/32 in in B-Line's fittings section.