KWS Manufacturing

Screw Conveyor Shafts

Coupling Shaft Close Coupling Shaft End Shaft Hanger End Shaft Roller Thrust Bearing Shaft Bulkhead Shaft Torque Arm Shaft


Shafts are designed to transmit rotation and torque between individual conveyor screw sections and provide radial support at the hanger bearings and trough ends. Shafts are manufactured from cold-rolled C-1045 carbon steel as well as 304 and 316 stainless steel; other materials are available upon request. Cold-rolled C-1045 carbon steel shafts are adequate for most applications. However, high-tensile strength materials such as C-4140 may be required for specific applications. Stainless steel shafts may be necessary when corrosive or contaminable materials are to be conveyed. Using a combination of CNC and specially-built jigs, KWS shafts are manufactured to the tightest tolerances available and ensure perfect bolting alignment.

Shaft size is determined based on full motor torque of the drive assembly and the materials of construction of the shafts. Cold-rolled C-1045 carbon steel has a yield strength of 45,000 psi. 304 and 316 stainless steel shafts have a yield strength of 30,000 psi. Please refer to the Engineering Section of the KWS Engineering Guide for further information on shaft selection. A significant safety factor is included in the shaft design calculations.

For information regarding the weights of each shaft, please contact KWS Engineering.

Coupling Shafts

Coupling Shaft

Coupling shafts transmit rotation and torque between screw sections. Clearance is provided between the screw sections for a hanger and hanger bearing support. Hardened shafts are required for hard iron hanger bearings.

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Close Coupling Shafts

Close Coupling Shaft

Close coupling shafts transmit rotation and torque between screw sections. The screw sections are butted together with no clearance and clocked to form one continuous helix. Close coupled screws are supported by a wear liner or wear bars that are welded into the trough sections.

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End Shafts

End Shaft

End shafts support the tail end of the screw section at the non-drive end of the screw conveyor. End shafts are typically the same diameter as the coupling and drive shafts. End shaft length is dependent on the type of end bearing, seal and trough end.

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Hanger End Shafts

Hanger End Shaft

Hanger end shafts are very similar to end shafts except that a hanger with hanger bearing is used as the end bearing instead of a flanged or pillow block bearing. Hanger end shafts are hardened in the bearing area when using hard iron hanger bearings.

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Roller Thrust Bearing Drive

Roller Thrust Bearing Drive Shaft

Roller thrust bearing drive shafts are used with roller thrust bearings. A key-way is provided to couple the drive shaft with the output shaft of a gear reducer or a sprocket with chain. The drive shaft has snap ring grooves on either side of the flanged roller bearing to capture thrust loading in both directions.

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Shafts Bulkhead Drive

Bulkhead Drive Shaft

Bulkhead drive shafts are extended shafts that are used with KWS bulkhead trough ends. Standard bulkhead drive shafts can be designed to work with any gear reducer manufacturer.

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Torque Arm Drive

Torque Arm Drive Shaft

Torque arm drive shafts are extended shafts that are used with KWS torque arm trough ends. Standard torque arm drive shafts can be designed to work with any gear reducer manufacturer.

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Coupling Shaft

Nomenclature

Coupling Shaft Nomenclature
Shaft Dia. Part Number A B C D
1” CS1#* 2” 1-1/2” 3” 7-1/2”
1-1/2” CS112#* 3” 2” 4-3/4” 11-1/2”
2” CS2#* 3” 2” 4-3/4” 11-1/2”
2-7/16” CS2716#* 3” 3” 4-7/8” 12-3/4”
3” CS3#* 3” 3” 5” 13”
3-7/16” CS3716#* 4” 4” 7” 18”
3-15/16” CS31516# 4” 4” 7-3/8” 18-3/4”
4-7/16” CS4716# 4” 5” 7-3/4” 20-1/2”

* KWS Stock Component (Made-to-order End Shafts are available upon request)
# Bearing Area; Blank = Standard, H = Hardened or Material; Blank = Standard, SS = Stainless Steel

Coupling Shaft Diagram

Close Coupling Shaft

Nomenclature

Close Coupling Shaft Nomenclature
Shaft Dia. Part Number A B C D
1” CCS1# 2” 1/2” 3” 6”
1-1/2” CCS112#* 3” 7/8” 4-3/4” 9-1/2”
2” CCS2#* 3” 7/8” 4-3/4” 9-1/2”
2-7/16” CCS2716#* 3” 15/16” 4-7/8” 9-3/4”
3” CCS3#* 3” 1” 5” 10”
3-7/16” CCS3716#* 4” 1-1/2” 7” 14”
3-15/16” CCS31516# 4” 1-11/16” 7-3/8” 14-3/4”
4-7/16” CCS4716# 4” 1-7/8” 7-3/4” 15-1/2”

* KWS Stock Component (Standard Only)
# Material; Blank = Standard, SS = Stainless Steel

Close Coupling Shaft Diagram

End Shaft

Nomenclature

End Shaft Nomenclature
Shaft Dia. Drilling A B Part Number
1” 2-Bolt 7-1/2” 3/4” ES1*
1-1/2” 2-Bolt 11-3/4” 1” ES112*
2” 2-Bolt 12” 1” ES2*
2-7/16” 2-Bolt 13” 1-1/2” ES2716*
3” 2-Bolt 14” 1-1/2” ES3*
3-7/16” 2-Bolt 17-3/8” 2” ES3716*
3-15/16” 2-Bolt 19-1/4” 2” ES31516
4-7/16” 2-Bolt 20-3/4” 2-1/2” ES4716

* KWS Stock Component. (Made-to-order End Shafts are available upon request)



Hanger End Shaft

Nomenclature

Hanger End Shaft Nomenclature
Shaft Dia. A B C D E Part Number
1” 3” 1-5/8” 4-5/8” 3/4” 2-3/8” HES1#
1-1/2” 4-3/4” 2-1/8” 6-7/8” 1” 3-1/8” HES112#
2” 4-3/4” 2-1/8” 6-7/8” 1” 3-1/8” HES2#
2-7/16” 4-7/8” 3-1/4” 8-1/8” 1-1/2” 4-3/4” HES2716#
3” 5” 3-1/4” 8-1/4” 1-1/2” 4-3/4” HES3#
3-7/16” 7” 4-1/4” 11-1/4” 2” 6-1/4” HES3716#
3-15/16” 7-3/8” 4-1/4” 11-5/8” 2” 6-1/4” HES31516#
4-7/16” 7-3/4” 5-1/4” 13” 2-1/2” 7-3/4” HES4716#

# Bearing Area; Blank = Standard, H = Hardened or Material; Blank = Standard, SS = Stainless Steel



Roller Thrust Bearing Shaft

Nomenclature

Roller Thrust Bearing Shaft Nomenclature
Shaft Dia. B A (WPS) Part Number
1” Not Available
1-1/2” 1” 15-15/32” RTB112
2” 1” 16-1/8” RTB2
2-7/16” 1-1/2” 18-5/16” RTB2716
3” 1-1/2” 19-7/16” RTB3
3-7/16” 2” 24-1/8” RTB3716
3-15/16” Contact KWS RTB31516
4-7/16” Contact KWS RTB4716


Bulkhead Shaft

Nomenclature

Bulkhead Shaft Nomenclature
Shaft Dia. A Part Number
1” 3/4” •DS-#-1-#-BH
1-1/2” 1” •DS-#-112-#-BH
2” 1” •DS-#-2-#-BH
2-7/16” 1-1/2” •DS-#-2716-#-BH
3” 1-1/2” •DS-#-3-#-BH
3-7/16” 2” •DS-#-3716-#-BH
3-15/16” 2” •DS-#-31516-#-BH
4-7/16” 2-1/2” •DS-#-4716-#-BH

# = Varies Depending Upon Drive Selection and Number of Bolts
•Drive Manufcturer: N = Nord, Q = Quantis



Torque Arm Shaft

Nomenclature

Torque Arm Shaft Nomenclature
Shaft Dia. A Part Number
1” 3/4” •DS-#-1-#-P
1-1/2” 1” •DS-#-112-#-P
2” 1” •DS-#-2-#-P
2-7/16” 1-1/2” •DS-#-2716-#-P
3” 1-1/2” •DS-#-3-#-P
3-7/16” 2” •DS-#-3716-#-P
3-15/16” 2” •DS-#-31516-#-P
4-7/16” 2-1/2” •DS-#-4716-#-P

# = Varies Depending Upon Drive Selection and Number of Bolts
• Drive Manufacturer: N = Nord, Q = Quantis