Type DC is a sprag type freewheel cage without inner or outer races. It must be installed in a design providing races, bearing support for axial and radial loads, lubrication and sealing. The DC type version-N accepts all types of lubricants currently used in the power transmission equipement.
The sprag space tolerance must not be exceeded. Inner and outer races must both have a minimum plain width “e”, without any recess, to ensure the freewheel functions correctly as shown on following pages.

Alternatively, races can be made in case hardened steel shafts, or housings, to the specification below. Surface hardness of the finished part should be HRC 60 to 62, for a depth of 0,6 mm minimum.

Core hardness to be HRC35 to 45. Surface roughness not to exceed 22CLA. Maximum taper between races: 0,007 mm for 25 mm width.

Technical Datas

Item	DC72218(5C)-N
Material	GCr15
Bore dia.	72.217 mm
Outer dia.	88.877 mm
Width	21 mm
Torque capacity	1279 N.m
Overrunning speeds (imax)	2600 r/min
Overrunning speeds (amax)	1300 r/min
Weight	0.31 kg
Package	Carton box or as your requirements

Dimensions and Capacities

Size	TKN1)	Overrunning speeds				Sprag space				NO. of clips	No. of sprags	Weight
	TKN1)	nimax2)	namax3)	Øa+0.008 -0.005	Øc± 0.013	Sprag space	emin	Ødmin	Øbmax	NO. of clips	No. of sprags	Weight
	[Nm]	[min-1]	[min -1]	[mm]	[mm]	[mm]	[mm]	[mm]	[mm]			[kg]
DC2222G-N	63	8600	4300	22.225	38.885	8.33±0.075	10	50	15	–	12	0.03
DC2776-N	119	6900	3400	27.762	44.422	8.33±0.075	13.5	58	18	–	14	0.055
DC3034-N	124	6300	3100	30.34	47	8.33±0.075	13.5	62	20	–	14	0.06
DC3175(3C)-N	159	6000	3000	31.75	48.41	8.33±0.075	13.5	63	21	3	16	0.06
DC3809A-N	275	5000	2500	38.092	54.752	8.33±0.075	16	71	25	–	18	0.085
DC4127(3C)-N	224	4600	2300	41.275	57.935	8.33±0.075	13.5	75	27	3	18	0.09
DC4445A-N	363	4300	2100	44.45	61.11	8.33±0.1	16	79	29	–	20	0.095
DC4972(4C)-N	306	3800	1900	49.721	66.381	8.33±0.1	13.5	86	33	4	22	0.1
DC5476A-N	525	3500	1700	54.765	71.425	8.33±0.1	16	92	36	–	24	0.11
DC5476A(4C)-N	525	3500	1700	54.765	71.425	8.33±0.1	16	92	36	4	24	0.13
DC5476B(4C)-N	769	3500	1700	54.765	71.425	8.33±0.1	21	92	36	4	24	0.18
DC5476C(4C)-N	990	3500	1700	54.765	71.425	8.33±0.1	25.4	92	36	4	24	0.2
DC5776A-N	604	3300	1600	57.76	74.42	8.33±0.1	16	98	38	–	26	0.11
DC6334B-N	806	3000	1500	63.34	80	8.33±0.1	21	104	42	–	26	0.175
DC7221(5C)-N	675	2600	1300	72.217	88.877	8.33±0.1	13.5	115	48	5	30	0.14
DC7221B-N	1279	2600	1300	72.217	88.877	8.33±0.1	21	115	48	–	30	0.185
DC7221B(5C)-N	1279	2600	1300	72.217	88.877	8.33±0.1	21	115	48	5	30	0.21
DC7969C(5C)-N	2038	2400	1200	79.698	96.358	8.33±0.1	25.4	124	53	5	34	0.28
DC8334C-N	2055	2300	1100	83.34	100.000	8.33±0.1	25.4	132	55	–	34	0.27
DC8729A-N	1250	2200	1100	87.29	103.96	8.33±0.1	16	134	58	–	34	0.165
DC10323A(5C)*-N	1612	1800	900	103.231**	119.891	8.33±0.1	16	155	68	5	40	0.205
DC12334C*-N	4800	1500	750	123.340**	140.000	8.33±0.1	25.4	184	80	–	50	0.4
DC12388C(11C)	4875	1500	750	123.881	142.88	9.50±0.1	25.4	186	80	11	44	0.4

NOTES
1) T max = 2 × T KN
» Refer to Selection page 12 to 19
2) Inner race overruns
3) Outer race overruns
*) The inner cage centering flange is on the opposite
side
**) Extension of tolerance to ± 0,013 permissible

Mounting Example

Pictures

DC7221B(5C)-N One Way Sprag Clutch Bearings 2

DC7221B(5C)-N One Way Sprag Clutch Bearings 3

DC7221B(5C)-N One Way Sprag Clutch Bearings 4

Application
DC7221B(5C)-N One Way Sprag Clutch Bearings 5

Package

　　Main Market:North America, South America, Western Europe, Eastern Europe, Eastern Asia, Southeast Asia, Middle EastBusiness Type:Manufacturer, Trading CompanyBrandsSUMANo. of Employees50~51Annual Sales1000000-2000000Year Established2005Export p.c70% - 80%Changzhou Suma Precision Machinery Co., Ltd was established in 2005, which was a professional and non-stop manufacturer for mechanical parts, integrates into R&D, Design, Manufacturing and Sales . One Way Clutch Bearing: CSK, ASNU, AS , NF, FE, DC, FWD, BWC, AXK, AA, B200, BB, CKA, ... Backstop Clutch : BS, MZ, FSO, HPI, PB, BS...R, NJ, NYD, NF, CKZ, RSBW, AV , ... Overrunning clutch: FXM, GFR, RSCI, RSXM, CKL-A, CKF-A, RSBI, GFK, GV, GVG, BSEU, ... Needle Roller Bearings: HF,HFL, RC, RCB, FC, FCB, OWC, EWC, 1WC, HK, SCE, BCE, IR, ...Cam follower bearings : CF, KR, CFE, CFH, CYR, CYR...S, NATV, NATR, NUTR, KRV, RSTO, ...Spherical Plain Bearings : GE, GE...ES-2RS, GE...DO-2RS, GEG...ES-2RS, GEEW...ES-2RS, GE...UK-2RS, GE...ET-2ES, ... Advantage of Company ?Germany Technology Introduction ensure goods reach an top-level quality . Core Technical Team ensure ability to Find out - Work out problems more efficiently . Over 15 Years Production Experience makes us easier to find out a solution from any industrial field . Superior Equipment Production Line ensure goods produced under strictly quality control . OEM / ODM available significantly save the customer's funds and enlarge the benefits. Advantage of Products High Torque Transmission High Load Capacity Preferable Wear Resistance Free Sample Quality Test Service (specially for small standard item)Pre-Lubricated ensure its Long Life Using Time Application Field With a wide range of variety ( Over 100 different patterns and more than thousands sizes available ), products are widely used in Printing Machine, Packaging Machine ,Conveyor System, Bucket Elevator, Gearbox , Reducer, Gearmotor, Electronics Toy, Hydraulic System and any power transmission industrial field. Market With over 13 years experience, well equipped testing facilities and strict quality control, Changzhou Suma Precision Machinery Co., Ltd products sell well all over the world, the main markets are European, America, Canada, Brazil, India, Asia, etc . It was a certified enterprise with Quality Management System ISO9001:2015, SGS , Safety Certificate of Approval for Mining Products . In the meantime, with accurate control of key process and technical support from engineer team, customized products are also available. Stable product performance and reliable after sales service always are our only way to win customer.HISTORY2005-8-8, Establishd Changzhou Suma Precision Machinery Co.,Ltd. At begining only produce some items of One way clutch bearings like CSK DC ASNU NFS GFR, etc .2012-07-11, Technical Team do R&D , Develop new design of the backstop clutch / overrunning clutch which has big torque transmission, widely used in Mining, Mednical, Conveyor System, Reducer, Gearbox, etc . 2015-03-16, Try to Step into the Needle roller bearings / Cam follower bearings to enlarge the market share . 2018-10-15, Involved in the field of spherical plain bearings and bring great convenience for new and old customers. SERVICEThe business principle of Changzhou Suma Precision Machinery Co., Ltd is human- oriented , customer first, excellent quality, prestige guarantee and perfect service . We anticipate for the cooperation with you and create a better future.Our Service :Give Technical Guidance before order ensure no mistake purchase .Online Trade-Assurance service make client more reliable to do internation business. Update production status frequently to make sure custom know exactly of every details .7/24 hours online quick answer to clear client doubt. Good package to protect no damage or harm during shipment . Supply Technical Manual for client do maintenance .Any quality problem during the warranty period can be negotiated to be solved ( Except for vandalism )One Way Bearing / Sprag Clutch Package for your reference :OUR TEAMWe always believe in that , Running a business is running the " Man " ，Only a united and cohesive team can produce high-quality products 。So we Organize team building activities from time to time to enhance mutual exchanges .