A 1/2″ × 12″ mixer/agitator shaft for a propeller or mixing blade, D-profile both ends, unthreaded, machined from 316 stainless with a cold-finished (mill) OD. Crosses McMaster 3513K46. Load it as a configurable starting point. Material, finish, tolerances, and features stay editable; the end geometry is taken from published catalog data, so check it against your mixer and attachment before ordering.
Priced instantly in the configurator: from $201 for this part as loaded. Change the material, tolerances, features, or quantity and the price updates as you go. $50 minimum order.
Material, finish, tolerances, and features (D-profile flat, threaded end, length) stay editable in the configurator. Diameter, overall length, end types, and thread size/length/direction are taken from the published catalog data; the D-profile flat dimensions are reconstructed from the catalog drawing, so check them against your mixer and attachment before ordering. The OD ships cold-finished (mill finish); for sanitary service call out a finer finish, and note that finishes finer than 32 Ra (16 Ra, for example) are reviewed and quoted rather than priced instantly. The drawing's title block stamps the source SKU so any deviation is visible to your buyer and to us.
Hubs and collars in the catalog bored for this diameter
Matched on diameter only (±0.0005″); confirm the keyway and fit class against your assembly.
Machined from 316 by default. See the 316 material guide, or change the grade 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.