Thomas & Betts 90 Degree Short Elbow, Malleable Iron, IMC

Four trade sizes: 1/2 inch (part 4250), 3/4 inch (4251), 1 inch (4252), and 1-1/4 inch (4253). Order by the conduit trade size you are running, not by the outside diameter of the pipe.

It is a rigid/IMC fitting. Rigid metal conduit and intermediate metal conduit share the same NPT thread specification in a given trade size, so a threaded elbow made for IMC takes RMC threads as well. Both are threaded male on each end and couple to your run with standard conduit couplings.

A short elbow turns the run in a tighter radius than a standard factory 90. That is what you want when you are coming out of a box or panel with limited clearance, or turning down a wall against a structural member. On larger conductors where bend radius matters for pulling, a standard radius 90 is the better choice. The Thomas & Betts 4250 series is the short pattern.

Malleable iron. That matters on commercial and industrial jobs where the fitting takes mechanical load or impact, and it is what most specs calling out threaded rigid/IMC fittings expect over die cast.

You need couplings. A threaded elbow has male threads on both ends, the same as the ends of a stick of IMC or rigid, so joining it to conduit takes a standard threaded coupling at each end. None are supplied with the elbow, so count two per elbow when you take off the job.

No single number covers it. Each trade size is a separate part: 4250 for 1/2 inch, 4251 for 3/4 inch, 4252 for 1 inch, 4253 for 1-1/4 inch. All four are the same malleable iron short elbow pattern, so you can standardize on the series and stock the sizes your runs actually use.