The USNU Series freewheels are not self-centering. It is therefore necessary to place one or two bearings next to the freewheel so that the outer race can rotate centrally to the inner race.

USNU freewheels have ball bearings with the same dimensions as the 63.. series.

The torque forces are transmitted from the shaft to the inner race by means of a key and from the outer race to the seating by means of front pullers or by means of an interference fit if the seating tolerance is made a K6.

Shaft tolerance must be either h6 or j7; the tolerances for the seating must be either H7 or F7.

When front pullers are not used, the seating tolerance should be K6.

Before being put onto service, the freewheels must be lubricated with suitable lubricants following the instructions given on page 12. Oil lubrication is essential when a high number of rotations in neutral is reached.

Technical Datas

Dimensions and Capacities

Type	Size	TKN1)	Overrunning Speeds										Weight	Drag torque
USNU	dH7	TKN1)	nimax2)	namax3)	Dn6	D5	L	b	t	s	e	f	Weight	TR
	[mm]	[Nm]	[min-1]	[min-1]	[mm]	[mm]	[mm]	[mm]	[mm]	[mm]	[mm]	[mm]	[kg]	[Ncm]
	8	12	3300	5000	35	28	13	4	1.4	2.4	0.6	0.3	0.07	1.6
	12	12	3300	5000	35	28	13	4	1.4	2.4	0.6	0.3	0.06	1.6
	15	30	2400	3600	42	37	18	5	1.8	2.4	0.8	0.3	0.11	1.9
	17	49	2300	3400	47	40	19	5	2.3	2.4	1.2	0.8	0.15	1.9
	20	78	2100	3100	52	42	21	6	2.3	2.4	1.2	0.8	0.19	1.9
	25	125	1700	2600	62	51	24	8	2.8	2.4	1.2	0.8	0.38	5.6
	30	255	1400	2200	72	60	27	10	2.5	2.4	1.8	1	0.54	14
	35	383	1200	1900	80	70	31	12	3.5	2.4	1.8	1	0.74	16
	40	538	1100	1700	90	78	33	12	4.1	2.5	1.8	1	0.92	38
	45	780	1000	1600	100	85	36	14	4.6	2.5	1.8	1	1.31	43
	50	1013	850	1350	110	92	40	14	5.6	2.5	1.8	1	1.74	55
	60	1825	750	1050	130	110	46	18	5.5	3.6	2.6	1.5	2.77	110
	70	2300	600	950	150	125	51	20	6.9	3.6	2.6	1.5	4.16	140
	80	3275	550	850	170	140	58	20	7.5	3.6	2.6	1.5	6.09	180
	90	5325	500	750	190	160	64	20	8	3.6	2.6	2	8.2	230
	100	7250	450	680	215	175	73	24	8.5	3.6	2.6	2	12.6	380
	120	13500	370	550	260	215	86	28	10	3.6	2.6	2.5	22	650
	150	26625	300	460	320	260	108	32	12	3.6	3.6	2.5	42	1000
	200	44500	230	350	420	350	138	45	16	7.6	3.6	3	93	2000

NOTES

ASNU8-12, ASNU200 keyway to DIN 6885. 1,

other sizes to DIN 6885.3
1) T max = 2 × T KN
2) Inner race overruns
3) Outer race overruns

Mounting Example

Pictures

USNU Series USNU60 One Way Roller Clutch Bearings 2

USNU Series USNU60 One Way Roller Clutch Bearings 5

　　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 .