A L T R A I N D U S T R I A L M O T I O N

CSK One Way

Bearing Clutches

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Overrunning Indexing
and Backstopping
Clutches
Formsprag and Stieber
have been designing,
manufacturing and delivering
dependable, long-lived,
precision power transmission
products for over 50 years,
providing one of the broadest
lines of overrunning clutches
in the world.
Formsprag and Stieber
overrunning clutches
deliver thoroughly
proven, dependable
power transmission.
Careful selection of
highest quality materials,
precision manufacturing
by experienced craftsmen,
conscientious assembly,
and rigid adherence to detail CSK Series
guarantee a reliable, quality
Clutches
product. Bearing envelope
(62 series) design sprag
Overrunning clutches handle clutches for overrunning,
torque loads up to 700,000 indexing and backstopping
lb.ft. (949200 Nm). Other applications.
sizes and designs are
available by special order.
Check Out
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find what you need just in a few clicks.
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using many helpful aids to identify
performance criteria, and the right
product will power its way to the top of
the list.
• Exclusive “Competitor Interchange”
feature lets you enter a competitor
part number and find the specific
replacement Formsprag model
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selection
Find it fast at • Submit an online RFQ to the
distributor of your choice
www.Formsprag.com
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 CSK Series CSK Advantages
Unique sprag design provides
a better way to achieve
a higher size for size
torque rating!
Design Features
• Four different mounting designs
• Wide bore range of 8 to 40 mm
• Self-contained, compact ball bearing
design
• 2RS, lip-sealed design
• No maintenance, grease
lubricated for life
• High speed range from 0-15,000 RPM
• Longer wearing life with Formchromed
Sprags
• 27 different designs in stock
• Operating temperature range: 21
C
to 140°F (-6 to 60°C). Special grease
available for operating temperatures:
-40 to 212°F (-40 to 100°C).
• Outside dimensions same as 6200
Bearing Series

C
C
Three Mounting Configurations
Press Fit Keyseating Clutch Bore Keyseat In Clutch OD & ID

C C C

The Model CSK clutches must be The Model CSK..P clutches with a The Model CSK..PP clutches have a
mounted with a press fit on both keyseat in the bore must be secured keyseat on both the outer and inner
the outer and inner races. The shaft or axially retained on the customer’s race. The CSK..PP clutches must
diameter tolerance must be held to shaft by customer supplied snap be axially restrained by the use of
a n6. The bore of the housing for the ring, set collar, spacer or step in customer supplied snap ring, set
outer race should be a N6 tolerance. shaft diameter. The CSK..P outer collar, spacer, etc.
C
race is mounted with a press fit into
the bore of the housing.
C

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CSK Series CSK Advantages
CSK CSK..2RS Dimensions inches (mm)
Type CSK is a sprag type clutch CSK..2RS clutches Bearing
Size CSK CSK..2RS Bore Sizes
in­te­grat­ed into a 62 Series ball bear­ are .197” (5mm) wider Series
ing (except siz­es 8 and 40). It is than a standard 62 Dh5 L L d
bear­ing sup­port­ed, shipped grease Series bearing, as they in in in in
lu­bri­cat­ed and pro­tect­ed against dust are equipped with lip (mm) (mm) (mm) (mm)
larger than .012” (.3mm) diameter. The seals for washdown
use of additional “nylos” type seals is applications. 0.87 .035 *.035 .031
8
rec­om­mend­ed especially when the (22) (9) (9) (8)
working ­temper­a­ture ex­ceeds 122°F 1.26 0.39 0.55 0.47
12 6201
(50°C). (32) (10) (14) (12)
Oil bath lubrication is also possible if 1.38 0.43 0.63 0.59
15 6202
the original grease is first flushed out (35) (11) (16) (15)
us­ing a suitable solvent.

)
1.57 0.47 0.67 0.67

+0.000
17

-0.01
6203
Dh5

Torque transmission is ensured by a (40) (12) (17) (17)

d
press fit assembly into a rigid outer

(
1.85 0.55 0.75 0.79
hous­ing with N6 tolerance, and onto a 20 6204
(47) (14) (19) (20)
shaft with n6 tolerance. The initial
2.05 0.59 0.79 0.98
bear­ing radial clearance is set at C5, 25 6205
(52) (15) (20) (25)
and is reduced if using the press fit as
L 2.44 0.63 0.83 1.18
spec­i­fied. 30 6206
(62) (16) (21) (30)
One race may be glued. If both rac­es
are to be glued, performance will be 2.83 0.67 0.87 1.38
35 6207
re­duced or a C3 bearing clear­ance (72) (17) (22) (35)
will be necessary. 3.15 0.87 1.06 1.57
40
(80) (22) (27) (40)
Operating temperature range: 21 to
140°F (-6 to 60°C). Special grease * CSK8-2RS has only one lip seal on ball bearing side.
available for operating temperatures:
-40 to 212°F (-40 to 100°C).

Specifications inches (mm)

Bearing Torque Max. Overrunning Resistance
Size Bearing Loads Shipping Weight
Series Capacity Speed after run-in
CSK..2RS CSK CSK CSK CSK CSK..2RS
Dynamic Static
lb.ft lb.in lb.in lb. lb.
RPM lb. lb.
(Nm) (Ncm) (Ncm) (kg) (kg)
(kN) (kN)
2.6 *0.07 0.04 738 194 0.03 0.03
8 15,000
(3.5) (.8) (0.5) (3.28) (0.86) (0.015) (0.015)
8.8 0.27 0.06 1373 623 0.09 0.11
12 6201 10,000
(12) (3.0) (0.7) (6.1) (2.77) (0.04) (0.05)
14.7 0.35 0.08 1665 770 0.13 0.15
15 6202 8,400
(20) (4.0) (0.9) (7.4) (3.42) (0.06) (0.07)
30 0.50 0.09 1778 885 0.15 0.20
17 6203 7,350
(40) (5.6) (1.1) (7.9) (3.8) (0.07) (0.09)
50 0.53 0.12 2115 1004 0.24 0.32
20 6204 6,000
(68) (6.0) (1.3) (9.4) (4.46) (0.11) (0.145)
77 0.53 0.18 2408 1229 0.31 0.39
25 6205 5,200
(105) (6.0) (2) (10.7) (5.46) (0.14) (0.175)
133 0.66 0.39 2633 1451 0.46 0.60
30 6206 4,200
(180) (7.5) (4.4) (11.7) (6.45) (0.21) (0.27)
177 0.73 0.51 2835 1638 0.66 0.88
35 6207 3,600
(240) (8.2) (5.8) (12.6) (7.8) (0.3) (0.4)
284 0.89 0.62 3497 2756 1.10 1.32
40 3,000
(385) (10) (7) (15.54) (12.25) (0.5) (0.6)
* CSK8-2RS has only one lip seal on ball bearing side.
The torque ratings are based upon 1 million load cycles at full catalog torque which is a standard in the North American Industrial Market.

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 L L

CSK Series CSK Clutches

bJS9 bJS9 bJS9
CSK..P

t
CSK..P has the same construction and
outside dimensions as type CSK, but has a

d-0,01

d-0,01
d-0,01

d-0,01
d-0,01

d-0,01
Dh5

Dh5
a

Dh5

Dh5
keyway on the inner race. a

Dh5

Dh5
a a

These clutches can be mounted on a shaft

to k6 tolerance.
The outer race must be pressed into a rigid
housing to N6 tolerance.
L L L L
L L

CSK..2RS CSK..P CSK..PP

CSK..2RS clutches are .197” (5mm) wider Single Keyway Dual Keyways
than a standard 62 Series bearing, as they
are equipped with lip seals for washdown Dimensions inches (mm)
applications. L d a
Size Bearing
Series CSK..P CSK..P2RS Bore Sizes Keyseat*
CSK..PP Dh5 b t a a a
in in in in in in (mm)
CSK..PP features a keyway on both the (mm) (mm) (mm) (mm) (mm) (mm)
inner and outer race. The recommended
mounting tolerances are k6 on the shaft 1.26 0.39 0.55 0.47
12 6201
(32) (10) (14) (12)
(4 x 1.8)
and K6 in a rigid housing. An h6 tolerance
on the shaft or H6 in the housing are also 1.38 0.43 0.63 0.08 0.02 0.59
15 6202
(35) (11) (16) (2) (0.6) (15)
(5 x 1.2)
acceptable for a light press fit assembly.
Operating temperature range: 21 to 140°F 1.57 0.47 0.67 0.08 0.04 0.67
17 6203
(40) (12) (17) (2) (1.0) (17)
(5 x 1.2)
(-6 to 60°C). Special grease available for
operating temperatures: -40 to 212°F (-40 1.85 0.55 0.75 0.12 0.06 0.79
20 6204
(47) (14) (19) (3) (1.5) (20)
(6 x 1.6)
to 100°C).
2.05 0.59 0.78 0.24 0.08 0.98
25 6205
(52) (15) (20) (6) (2) (25)
(8 x 2)

2.44 0.63 0.82 0.24 0.08 1.18

30 6206
(62) (16) (21) (6) (2) (30)
(8 x 2)

2.83 0.67 0.87 0.31 0.10 1.38

35 6207
(72) (17) (22) (8) (2.5) (35)
(10 x 2.4)

3.15 0.87 1.06 .39 .12 1.57

40 (80) (22) (27) (10) (3.0) (40)
(12 x 3.3)

*For keyseat sizes CSK 15–35 use DIN 6885.3. For size 40 use DIN 6885.1 in catalog P-956.
Specifications inches (mm)
Size Bearing Torque Max. Overrunning Resistance Bearing Loads Shipping Weight
Series Capacity Speed after run-in
CSK..2RS CSK Dynamic Static CSK..P CSK..PP
lb.ft RPM lb.in lb.in lb. lb. lb. lb.
(Nm) (Ncm) (Ncm) (kN) (kN) (kg) (kg)
8.8 0.27 0.06 1373 623 0.08 0.11
12 6201
(12)
10,000
(3.0) (0.7) (6.1) (2.77) (0.04) (0.05)
14.7 0.35 0.08 1665 770 0.13 0.15
15 6202
(20)
8,400
(4.0) (0.9) (7.4) (3.42) (0.06) (0.07)
30 0.50 0.09 1778 885 0.15 0.19
17 6203
(40)
7,350
(5.6) (1.1) (7.9) (3.8) (0.07) (0.09)
50 0.53 0.12 2115 1004 0.24 0.32
20 6204
(68)
6,000
(6.0) (1.3) (9.4) (4.46) (0.11) (0.14)
77 0.53 0.18 2408 1229 0.31 0.39
25 6205
(105)
5,200
(6.0) (2) (10.7) (5.46) (0.14) (0.17)
133 0.66 0.39 2633 1451 0.46 0.59
30 6206
(180)
4,200
(7.5) (4.4) (11.7) (6.45) (0.21) (0.27)
177 0.73 0.51 2836 1638 0.66 0.88
35 6207
(240)
3,600
(8.2) (5.8) (12.6) (7.8) (0.3) (0.4)
284 0.89 0.62 3497 2756 1.10 1.32
40 (385)
3,000
(10) (7) (15.54) (12.25) (0.5) (0.6)

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Overrunning Clutches Application Data Form

Date For indexing applications

Indexes per minute__________max.
Company name
Degrees per index__________max.

Clutch operating time

Address

hours per day

City State Zip

Shaft diameter (give limits)

Name of contact Title

Size of keyseat in shaft

Phone Fax

Type of equipment Environment

Temperature range °F to °F

Exposed location?
Type of application
n Overrunning n Indexing Radiation?
n Backstop n Clutch Coupling
For non-symmetrical clutches and clutch-couplings
Maximum torque at clutch
a. Identify the end from which the clutch is viewed
pound-feet, or
HP at RPM
b. The
 (inner, outer) member (drives, overruns) in the
Power Source (clockwise, counter-clockwise) direction
n Electric motor n Diesel engine
n Turbine n Air cylinder Anticipated quantity required
n Gasoline engine
a. For this application
Load Application
n Smooth n Moderate n Shock
b. Annually
Lubrication
n Runs in oil n Not accessible
n Accessible for lubricating Supply a sketch of your installation.

Type or specification of lubricant Note: A clutch is not a coupling. When necessary to couple
two shafts, a coupling must be used with the clutch. Ambient
temperature should not exceed approxi­mately 150°F. It is re­
quested that prints of installation be supplied if available.
For overrunning or backstop applications
Inner race speed during overrunning RPM max.
Outer race speed during overrunning RPM max.
If both members are rotating during overrunning, are they ­
rotating in the
n Same direction n Opposite directions
Completed by
Time cycle of Formsprag clutch
Drive____________minutes Rest____________minutes
Overrun___________minutes

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The power of one, the strength of many.
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