Strut Fitting Reference
Strut fittings are the pre-formed plates and angles that join channel into frames, racks, and supports — no welding, just bolt them on with channel nuts. There are a lot of shapes, so this reference groups them into families and explains what each one is for, so you can spec the right fitting fast.
Fitting Families at a Glance
| Family | What It Does | Typical Members |
|---|---|---|
| Flat Fittings | Join strut in the same flat plane | Splice plates, corner plates, tee & cross plates |
| 90-Degree Fittings | Turn a corner or hang a shelf at a right angle | Corner angles, gusseted angles, shelf angles |
| Angle Fittings | Join at a fixed or adjustable angle | Open/closed angles (45/60 deg), adjustable hinges |
| U-Shape Fittings | Span across or cradle a member | U supports, saddle washers, splice clevises |
| Z-Shape Fittings | Offset the connection to another plane | Z supports, offset supports |
| Wing Fittings | Build multi-plane / wrap-around connections | Wing tees, corner wings, gusseted wings |
| Washers & Swivels | Spread load, connect threaded rod | Square washers, saddle washers, swivels |
Flat Fittings
Flat fittings keep everything in one plane. Splice plates extend a straight run; corner plates make an L; tee plates branch a third leg; cross plates make a four-way. Use them where the strut faces are coplanar. Examples: 2-hole splice STR4612, 3-hole corner STR4621, 4-hole tee STR4627.
90-Degree & Angle Fittings
When you need to turn out of plane, use an angle. Corner angles make a 90-degree joint; gusseted angles add a reinforcing web for higher load; shelf angles project out to carry a shelf. Open and closed angle fittings set fixed angles like 45 and 60 degrees, and adjustable hinges let you dial in any angle. Examples: 2-hole corner angle STR4642, 4-hole shelf angle STR4660, 45-degree open angle STR467645.
U-Shape & Z-Shape Fittings
A U fitting spans across or cradles a member — handy for supporting a crossing strut or pipe. A Z fitting steps the connection over to a parallel plane, useful when two members do not line up. Examples: 5-hole U support STR4699, 4-hole splice clevis STR4717.
Wing Fittings
Wing fittings handle the tricky multi-plane joints — wrap-around corners, bent tees, and gusseted double corners — where a flat plate or simple angle will not reach. They are the problem-solvers for complex frames.
Washers & Swivels
Square washers spread the bolt load across the channel lips and resist pull-through; saddle washers seat round stock; swivel connectors join threaded rod to fittings at an angle. Small parts, but they make the difference between a clean, tight assembly and a sloppy one. Example: 3/8 square washer STR4601.
Brand Cross-Reference
| EFS SKU | Description | Unistrut | PowerStrut | B-Line |
|---|---|---|---|---|
| STR4612 | 2-hole flat splice plate | P1065 | PS 601 | B129 |
| STR4642 | 2-hole corner angle | P1068 | PS 604 | B101 |
| STR4660 | 4-hole shelf angle | P1359 | PS 748 | B118 |
| STR4699 | 5-hole U support | P1047 | PS 613 | B107 |
Full chart: Strut Brand Cross-Reference.
Frequently Asked Questions
What is the difference between a flat fitting and an angle fitting?
A flat fitting joins strut in the same plane — splicing a straight run or branching a tee. An angle fitting turns the connection out of plane, usually 90 degrees, to build a corner or hang a shelf. Use flat fittings to extend and branch, angles to change direction.
What is a strut U fitting versus a Z fitting?
A U fitting spans across or cradles a member. A Z fitting offsets the connection to a parallel plane, stepping the strut over a set distance. U fittings span and support; Z fittings offset.
What is a gusseted angle?
A gusseted angle is a corner angle with an added triangular web (the gusset) between its legs. The gusset stiffens the joint so it carries more load without flexing, used where a plain corner angle would be too weak.
Do strut fittings interchange between brands?
Yes, at the same 1-5/8 inch profile. A fitting from one brand bolts to another brand's channel of the same size. See the cross-reference to match a Unistrut, B-Line, or PowerStrut number to ours.