A 3-7/16″ CEMA screw-conveyor 3-bolt coupling shaft that joins two screw-conveyor sections over a hanger bearing. Cut from 3-7/16″ (3.438″) cold-drawn bar with the OD left as supplied, 25-1/2″ (25.5″) overall, drilled for a 7/8″ 3-bolt coupling at each end to the CEMA hole pattern. Crosses SCC 147-0897 / KWS CS37163B. Load it as a configurable starting point. Material, tolerances, and features stay editable; check the dimensions against your conveyor or old shaft before ordering.
Priced instantly in the configurator: from $684 for this part as loaded. Change the material, tolerances, features, or quantity and the price updates as you go. $50 minimum order.
Material, tolerances, and features (transverse coupling holes, drive-end keyseat, overall length) stay editable in the configurator. The shaft diameter, coupling-bolt size, transverse hole diameter and spacing, and the drive-end ANSI B17.1 keyseat come from the published CEMA (ANSI/CEMA 300) Martin Sprocket, and Screw Conveyor Corp data; the hanger-bearing and drive-end journal positions on the bar are representative, so check them against your conveyor or old shaft before ordering. The drawing's title block stamps the source cross number so any deviation is visible to your buyer and to us.
Machined from 1045 by default. See the 1045 material guide, or change the grade in the configurator.
Frequently Asked Questions
It joins two screw-conveyor sections over a hanger bearing. The shaft slides into the pipe ends of both screws and is drilled through with a 2-bolt coupling at each end — two bolts per end, 90° apart and staggered along the shaft. CEMA (ANSI/CEMA 300) fixes the shaft diameter, coupling-bolt size, hole diameter, and hole spacing by size, so a card matched to your shaft diameter and bolt pattern fits any screw pipe of that size. Each card loads into the configurator with the coupling holes pre-placed.
A coupling shaft joins two screw sections over a hanger bearing and has a 2-bolt coupling at both ends. A close-coupling shaft also joins two screws, but with no hanger: the pipe ends butt together, so the shaft is shorter by the hanger gap and carries the same holes. A drive shaft is the head-end shaft that takes the gear reducer or motor coupling. It has a 2-bolt coupling at the pipe end and an ANSI B17.1 keyseat at the drive end. An end (tail) shaft supports the non-drive end and has a 2-bolt coupling at the pipe end only. A hanger-end shaft has a 2-bolt coupling at the pipe end and a short stub that rides in a hanger bearing. All of them are cut from a constant-diameter cold-drawn bar with the coupling holes (and, on drives, the keyseat) pre-dimensioned. The OD is left as it comes from the mill.
Match the shaft diameter to your screw-conveyor size (1, 1-1/2, 2, 2-7/16, 3, or 3-7/16 inch), which fixes the coupling-bolt size and the hole pattern. If you are replacing a catalog part, the cards cross-reference the Martin CC/CCC/CD/CE/CHE, KWS CS/CCS/DS and Screw Conveyor Corp 3-bolt series. Pick the card whose size, type, and cross number match your shaft.
The cards default to C-1045 cold-drawn steel, the CEMA standard for coupling and drive shafts. For corrosive or sanitary duty switch to 304 or 316 stainless in the configurator. On coupling and hanger shafts the bearing area is often induction-hardened (about 40 to 50 Rockwell C) so the hanger bearing wears before the shaft; we machine the shaft, and that hardening is a downstream step we do not offer. Material certs (MTRs) are available on request.
No. The OD ships as the cold-drawn bar comes from the mill (a "mill finish", about 63 µin Ra), held to the bar's own mill tolerance, which sits under nominal the way commercial shafting should for hanger and pillow-block bearings. We drill the coupling holes and cut the drive keyseat. If your bearing needs a tighter journal, choose Machine this diameter in the configurator and call out the tolerance and finish you need.
The shaft diameter, overall length, coupling-bolt size, transverse hole diameter and spacing, and the drive-end keyseat size come straight from the published CEMA, Martin Sprocket, and Screw Conveyor Corp data. The hanger-bearing and drive-end journal positions on the bar, and the keyseat length on the 1 and 1-1/2 inch drive shafts, are representative, so check them against your conveyor or old shaft before ordering. The drawing title block stamps the source cross number so any deviation is visible.
Three bolts per pipe end spread the torque over more bolt area, so 3-bolt couplings show up in rendering, heavy-duty and high-torque service. The holes follow the 2-bolt spacing with one more hole added, so a 3-bolt shaft is longer than the 2-bolt shaft of the same size. Count the bolts on your screw pipe: a 2-bolt shaft will not fit a 3-bolt drilled pipe. These cards cover 3-bolt coupling shafts from 1-1/2 to 3-7/16 inch. The holes alternate 90° along each end, so check the clocking against your old shaft or pipe before ordering. For a 3-bolt drive or tail shaft, start from the 2-bolt card and add the third hole in the configurator, or send us the old shaft and we will quote it.
CEMA, Martin Sprocket & Gear, KWS, Orthman, and all other standard, part, and brand names shown are trademarks or trade names of their respective owners. Great Lakes Shafts is an independent manufacturer and is not affiliated with, sponsored by, or endorsed by any of them. These are aftermarket replacement shafts machined to the referenced CEMA dimensional standard; the names are used only to identify the equipment our parts fit.