CEMA Screw-Conveyor Shafts
Replacement CEMA screw-conveyor coupling, drive, and end shafts, drilled to the standard coupling-bolt pattern.
CEMA (ANSI/CEMA 300) fixes the shaft diameter, coupling-bolt size, and hole pattern by size, so a card matched to your shaft diameter and type fits any screw pipe of that size. Pick a size below to load it into the configurator with the transverse coupling holes (and, on drive shafts, the ANSI B17.1 keyseat) pre-dimensioned. Three types are offered: coupling shafts that join two screw sections over a hanger bearing (2-bolt couplings at both ends), drive shafts that take the reducer at the head end (2-bolt pipe coupling + a keyseat), and end/tail shafts. Default C-1045 cold-drawn, configurable to 304/316 stainless. You stay in control of material, surface finish, tolerance class, and any added features. The drawing's title block stamps the source cross number; check the dimensions against your conveyor or old shaft before ordering.
3-bolt couplings, close-coupling and hanger-end shafts, and the 1 and 1-1/2 inch sizes aren't on these cards yet, they're on our roadmap. Need one now? Send us a print or the old shaft and we'll quote it directly.
CEMA screw-conveyor shaft sizes
Replacement CEMA screw-conveyor shafts, drilled to the standard coupling-bolt pattern. Coupling shafts (2-bolt or 3-bolt couplings at both ends, over a hanger bearing), close-coupling shafts (no hanger, pipe ends butted), drive shafts (2-bolt pipe coupling + ANSI B17.1 keyseat for the reducer), end/tail shafts, and hanger-end shafts, in the standard 1, 1-1/2, 2, 2-7/16, 3, and 3-7/16 inch sizes. Shaft diameter, overall length, coupling-bolt size, hole diameter, and hole spacing are fixed by CEMA size and published per part; click a card to load a configurable starting point. Crosses the Martin Sprocket CC/CCC/CD/CE/CHE, KWS CS/CCS/DS, and Screw Conveyor Corp 3-bolt series.
Coupling Shaft
1″ Coupling Shaft
1″ shaft · 2-bolt couplings both ends · 3/8″ coupling bolts · 7-1/2″ OAL · Martin CC2
1-1/2″ Coupling Shaft
1-1/2″ shaft · 2-bolt couplings both ends · 1/2″ coupling bolts · 11-1/2″ OAL · Martin CC3 / KWS CS112
2″ Coupling Shaft
2″ shaft · 2-bolt couplings both ends · 5/8″ coupling bolts · 11-1/2″ OAL · Martin CC4 / KWS CS2
2-7/16″ Coupling Shaft
2-7/16″ shaft · 2-bolt couplings both ends · 5/8″ coupling bolts · 12-13/16″ OAL · Martin CC5 / KWS CS2716
3″ Coupling Shaft
3″ shaft · 2-bolt couplings both ends · 3/4″ coupling bolts · 13″ OAL · Martin CC6 / KWS CS3
3-7/16″ Coupling Shaft
3-7/16″ shaft · 2-bolt couplings both ends · 7/8″ coupling bolts · 17-1/2″ OAL · Martin CC7 / KWS CS3716
3-Bolt Coupling Shaft
1-1/2″ 3-Bolt Coupling Shaft
1-1/2″ shaft · 3-bolt couplings both ends · 1/2″ coupling bolts · 17-1/2″ OAL · SCC 147-0343
2″ 3-Bolt Coupling Shaft
2″ shaft · 3-bolt couplings both ends · 5/8″ coupling bolts · 17-1/2″ OAL · SCC 147-0459 / KWS CS23B
2-7/16″ 3-Bolt Coupling Shaft
2-7/16″ shaft · 3-bolt couplings both ends · 5/8″ coupling bolts · 18-3/4″ OAL · SCC 147-0566 / KWS CS27163B
3″ 3-Bolt Coupling Shaft
3″ shaft · 3-bolt couplings both ends · 3/4″ coupling bolts · 19″ OAL · SCC 147-0780 / KWS CS33B
3-7/16″ 3-Bolt Coupling Shaft
3-7/16″ shaft · 3-bolt couplings both ends · 7/8″ coupling bolts · 25-1/2″ OAL · SCC 147-0897 / KWS CS37163B
Close-Coupling Shaft
1″ Close-Coupling Shaft
1″ shaft · 2-bolt couplings both ends · 3/8″ coupling bolts · 6″ OAL · Martin CCC2
1-1/2″ Close-Coupling Shaft
1-1/2″ shaft · 2-bolt couplings both ends · 1/2″ coupling bolts · 9-1/2″ OAL · Martin CCC3
2″ Close-Coupling Shaft
2″ shaft · 2-bolt couplings both ends · 5/8″ coupling bolts · 9-1/2″ OAL · Martin CCC4 / KWS CCS2
2-7/16″ Close-Coupling Shaft
2-7/16″ shaft · 2-bolt couplings both ends · 5/8″ coupling bolts · 9-3/4″ OAL · Martin CCC5 / KWS CCS2716
3″ Close-Coupling Shaft
3″ shaft · 2-bolt couplings both ends · 3/4″ coupling bolts · 10″ OAL · Martin CCC6 / KWS CCS3
3-7/16″ Close-Coupling Shaft
3-7/16″ shaft · 2-bolt couplings both ends · 7/8″ coupling bolts · 13-1/2″ OAL · Martin CCC7 / KWS CCS3716
Drive Shaft
1″ Drive Shaft
1″ shaft · 2-bolt pipe coupling + 1/4 SQ drive keyseat · 3/8″ coupling bolts · 10-1/2″ OAL · Martin 1CD2
1-1/2″ Drive Shaft
1-1/2″ shaft · 2-bolt pipe coupling + 3/8 SQ drive keyseat · 1/2″ coupling bolts · 13-1/4″ OAL · Martin 1CD3
2″ Drive Shaft
2″ shaft · 2-bolt pipe coupling + 1/2 SQ drive keyseat · 5/8″ coupling bolts · 14-7/8″ OAL · Martin 1CD4 / KWS DS2
2-7/16″ Drive Shaft
2-7/16″ shaft · 2-bolt pipe coupling + 5/8 SQ drive keyseat · 5/8″ coupling bolts · 16-7/8″ OAL · Martin 1CD5 / KWS DS2716
3″ Drive Shaft
3″ shaft · 2-bolt pipe coupling + 3/4 SQ drive keyseat · 3/4″ coupling bolts · 18-3/8″ OAL · Martin 1CD6 / KWS DS3
3-7/16″ Drive Shaft
3-7/16″ shaft · 2-bolt pipe coupling + 7/8 SQ drive keyseat · 7/8″ coupling bolts · 22-7/8″ OAL · Martin 1CD7 / KWS DS3716
End Shaft
1″ End Shaft
1″ shaft · 2-bolt pipe coupling · 3/8″ coupling bolts · 6″ OAL · Martin CE2
1-1/2″ End Shaft
1-1/2″ shaft · 2-bolt pipe coupling · 1/2″ coupling bolts · 8-1/4″ OAL · Martin CE3
2″ End Shaft
2″ shaft · 2-bolt pipe coupling · 5/8″ coupling bolts · 8-5/8″ OAL · Martin CE4
2-7/16″ End Shaft
2-7/16″ shaft · 2-bolt pipe coupling · 5/8″ coupling bolts · 9-5/8″ OAL · Martin CE5
3″ End Shaft
3″ shaft · 2-bolt pipe coupling · 3/4″ coupling bolts · 10-5/8″ OAL · Martin CE6
3-7/16″ End Shaft
3-7/16″ shaft · 2-bolt pipe coupling · 7/8″ coupling bolts · 13-3/8″ OAL · Martin CE7
Hanger-End Shaft
1″ Hanger-End Shaft
1″ shaft · 2-bolt pipe coupling + hanger stub · 3/8″ coupling bolts · 4-5/8″ OAL · Martin CHE2
1-1/2″ Hanger-End Shaft
1-1/2″ shaft · 2-bolt pipe coupling + hanger stub · 1/2″ coupling bolts · 6-7/8″ OAL · Martin CHE3
2″ Hanger-End Shaft
2″ shaft · 2-bolt pipe coupling + hanger stub · 5/8″ coupling bolts · 6-7/8″ OAL · Martin CHE4
2-7/16″ Hanger-End Shaft
2-7/16″ shaft · 2-bolt pipe coupling + hanger stub · 5/8″ coupling bolts · 8-1/8″ OAL · Martin CHE5
3″ Hanger-End Shaft
3″ shaft · 2-bolt pipe coupling + hanger stub · 3/4″ coupling bolts · 8-1/4″ OAL · Martin CHE6
3-7/16″ Hanger-End Shaft
3-7/16″ shaft · 2-bolt pipe coupling + hanger stub · 7/8″ coupling bolts · 11-1/4″ OAL · Martin CHE7
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.