Replacement mixer & agitator shafts for propellers and mixing blades.
These drive a propeller or mixing blade in an open-tank or portable agitator, one end fits the mixer drive, the other fits the attachment. Pick a size below to load it into the configurator with the ends pre-machined. Three families: set-screw propeller (D-profile both ends, 316 SS), threaded propeller (5/16-24 right-hand thread, 316 SS), and mixing blade (1/4-20 left-hand thread for counterclockwise running, 303 SS; flat washer, left-hand hex nut, and sleeve washer not supplied). 5/16″ through 1″, up to 62″ long. You stay in control of material, finish, tolerance, and features.
The OD ships as the cold-finished bar comes from the mill (mill finish): about 63 µin Ra, held to the bar's own tolerance. The drive load transfers at the D-flat or thread, not the OD, so the OD doesn't need a finer finish. The machined ends carry standard ±0.005″ tolerances (no precision fits). For sanitary (food/pharma) service, or a close-fitting seal or bushing on the OD, choose Machine this diameter in the configurator and call out the finish or tolerance you need, and we turn it to spec. Finishes finer than 32 Ra (16 Ra, for example) are reviewed and quoted rather than priced instantly.
Mixer shaft sizes
Replacement mixer / agitator shafts that drive a propeller or mixing blade. One end fits the mixer drive, the other fits the attachment. Three families: set-screw propeller (D-profile both ends, 316 SS), threaded propeller (5/16-24 RH thread, 316 SS), and mixing blade (1/4-20 left-hand thread, 303 SS; washers + nut not supplied). 5/16″ through 1″, up to 62″ long, with a cold-finished (mill) OD, no precision fits. Click a card to load a configurable starting point. Crosses the McMaster 3473K / 1123N / 3518K mixer-shaft series.
Material guides for this family: 1045 · 304. Any offered grade can be chosen in the configurator.
Frequently Asked Questions
It connects a mixer drive to a propeller or mixing blade. One end fits the mixer drive: a D-profile flat for a coupling or set screw, or a plain (straight) end. The other fits the attachment: a D-flat for a set-screw propeller, a thread for a threaded propeller, or a left-hand thread for a mixing blade (its washers and nut are not supplied). Each loads into the configurator with the ends pre-machined; diameter, length, material, finish, and features stay editable.
Match the shaft diameter to your mixer drive and attachment, then the length to your tank depth. Pick the family by how the attachment mounts: set-screw propeller (D-profile both ends), threaded propeller (5/16-24 thread), or mixing blade (1/4-20 left-hand thread). If you're replacing a catalog part, the cards cross-reference the McMaster 3473K / 1123N / 3518K series.
Mixing blades run counterclockwise, so a left-hand thread tightens under load instead of backing off. The mixing-blade cards load a 1/4-20 left-hand thread sized for a flat washer, a left-hand hex nut, and a sleeve washer, which are not supplied (only the shaft ships). The threaded-propeller cards are right-hand (5/16-24).
Set-screw and threaded-propeller cards default to 316 stainless; mixing-blade cards default to 303 stainless. The OD ships as the cold-finished bar comes from the mill (a "mill finish", about 63 µin Ra), and the drive load transfers at the D-flat or thread, not the OD, so the OD doesn't need a finer finish. For sanitary (food/pharma) service, choose Machine this diameter in the configurator and call out a finer finish; finishes finer than 32 Ra (16 Ra, for example) are reviewed and quoted rather than priced instantly. Material certs (MTRs) are available on request.
No, there are no precision bearing journals or press fits on these. The machined ends load with standard ±0.005″ tolerances, and the OD is held to the bar's own mill tolerance. If your mixer has a close-fitting bushing or seal on the OD, choose Machine this diameter in the configurator and tighten that surface's tolerance and Ra target, and we turn it to spec.
The diameter, overall length, end types, and thread size/length/direction are taken from the published catalog data. The D-profile flat dimensions and which end is the mixer vs. attachment end are reconstructed from the catalog drawing, so check them against your mixer and attachment before ordering. The drawing title block stamps the source SKU so any deviation is visible.