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Changzhou Suma Precision Machinery Co., Ltd.

Backstop, Overrunning Clutch, Clutch Sprag manufacturer / supplier in China, offering Complete Freewheels for Keyway Connection on The Outer Ring (BM20), Nfs200 One Way Indexing Clutch Roller Type, Complete Freewheel/Overrunning Clutch with Shaft Coupling (FR...300CA) and so on.

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Supplier Homepage Product overrunning clutch (sprag clutch) Complete Freewheels for Keyway Connection on The Outer Ring (BM20)

Complete Freewheels for Keyway Connection on The Outer Ring (BM20)

FOB Price: US $100 / Piece
Min. Order: 1 Piece
Min. Order FOB Price
1 Piece US $100/ Piece
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Port: Shanghai, China
Production Capacity: 500PCS/Month
Payment Terms: T/T, Western Union, Paypal, Money Gram

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Basic Info
  • Model NO.: BM 20
  • Weight: 3.8kg
  • Inside Diameter: 30mm
  • Nominal Torque: 420nm
  • Delivery: 10-15days
  • Transport Package: Single Box or as Your Requirements
  • Origin: Changzhou, Jiangsu, China
  • Model: Bm 20
  • Outside Diameter: 105mm
  • Width: 77mm
  • OEM: Accept
  • Trademark: SUMA or OEM
  • Specification: P6
  • HS Code: 84836000
Product Description
         Complete Freewheels for Keyway Connection on The Outer Ring (BM20)

Data Sheet
ItemBM 20
BrandSUMA or OEM
Weight3.8 kg
Outside Diameter105 mm
Inside Diameter30 mm
Width77 mm
Nominal Torque420 Nm
Applicationtextile machines;printing machines;fans;other machine 

Complete Freewheels BM X are sealed sprag freewheels with ball bearings and sprag lift-off
X. They are supplied oil-filled and ready for installation. The sprag lift-off X ensures wear-free freewheeling operation when the inner ring rotates at high speed.
The freewheels BM X are used as:
 Overrunning Clutches
for applications with high speed freewheeling operation and when used as overrunning clutch
with low speed driving operation. Nominal torques up to 42.

Freewheel SizeTypeNominal t orque
Sprag lift-off at inner ring speed min-1Max. speeDBore d
mm   mm   mm
max. mmA
Inner ring freewheels/
overruns min-1
Outer ring drives min1
BM  20DX4207501 70030030  301211050,757720,258354,02,53,8
BM  25DX7007001 6002803540 401441250,759322,2510475,02,56,6
BM  30DX1 2506301 6002524550 501711500,7510224,2512525,04,010,3
BM  40SX1 9004301 500172455560602021800,7511625,2516646,06,517,4
BM  45SX2 3004001 500160556570702181951,2513024,7520787,58,522,4
BM  52SX5 6003201 500128657580802372151,7515033,7525799,08,531,1
BM  55SX7 7003201 250128758590902672451,7517035,2525969,06,545,6
BM  60SX14 5002501 10010085951001053142901,7520640,252812210,06,578,2
BM  70SX21 0002401 00096120  1203503201,2521544,752812310,09,093,4
BM 100UX42 50021075084150  1504504103,7527656,253615612,011,5198,4
Application example
Complete Freewheel BM 60 SX as a backstop, arranged at the end of the intermediate shaft of
a spur gearbox. The freewheel is used without the radial seal rings on each side, and is lubricated by the gearbox oil. A radial holding pin engages in the keyway of the outer ring. The
backdriving torque is supported by the holding pin in the stationary housing. By removing the
radial holding pin, the installation can be turned in both directions in order to carry out maintenance work. With the high shaft speed in normal operation (freewheeling operation), the
type with sprag lift-off X is used; the sprags work in freewheeling operation without contact and
hence are wear-free.

The customer attachment part is connected via a keyway connection with the outer ring. The
customer must provide the key required for assembling the attachment part. The tolerance of the shaft must be ISO h6 or j6 and the tolerance of the pilot diameter D of the attachment part must be ISO H7 or J7.

Company Information
Changzhou Suma Precision Machinery Co., Ltd(Changzhou Tianniu Clutch Factory)is a manufacturer specialized in Producing Various cam clutch, one way bearing, one way clutch, backstop clutch, overrunning clutch and other bearings with high technology. 

We are following "Best Quality, Best Price, Fast Delivery, Best Serves" to make all of our old and new customers satisfied. 
Our Advantages
1. Advanced producing equipment.
2. Strict requirement for the raw material
3. Complete&perfect process flow
4. Good quality of each batch of the product
5. Different grades of price for different quality
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