TM 5-3895-374-24-2
FORM 741E
Sure- Flex®
Couplings
Installation Instructions
Sure-Flex flanges (outer metallic parts) and sleeves
(inner elastomeric members) come in many sizes and
types. First, determine the size and type of components
being used. Remove all components from their boxes,
and loosely assemble the coupling on any convenient
surface. (Do not attempt to install the wire ring on the
two-piece E or N sleeve at this time.) Also check
maximum RPM values in Table 2 against operating
speed. All rubber sleeves (EPDM and Neoprene) have
the same ratings for a given size and may be used
interchangeably. However, because rubber and Hytrel
sleeves have completely different ratings, they never
should be used interchangeably.
1. Inspect all coupling components and remove any
protective coatings or lubricants from bores, mating
surfaces and fasteners. Remove any existing burrs, etc.
from the shafts.
2. Slide one coupling flange onto each shaft, using
snug-fitting keys where required. With
the Type B flange, it may be necessary to expand the
bore by wedging a screwdriver into the saw cut of the
bushing.
3. Position
the
flanges
on
the
shafts
to
approximately achieve the G1 dimension shown in Table
2. It is usually best to have an equal length of shaft
extending into each flange. Tighten one flange in its final
position. Refer to Table; 1 for fastener torque values.
Slide the other far enough away to install the sleeve.
With a two-piece sleeve, do not move the wire ring to its
final position; allow it to hang loosely in the groove
adjacent to the teeth, as shown.
4. Slide the losse flange on the shaft until the
sleeve is completely seated in the teeth of each flange,
(The "G1" dimension is for reference and not critical.)
Secure the flange to the shaft using the torque values
from Table 1.
TABLE 1 - FASTENER TORQUE VALUES (ft.-lbs.)
TYPE J
TYPE S
TYPE B
TYPE SC*
TYPE C
Coupling
2 Setscrews
2 Setscrews
3 Hex Head
4 Hex Head
1 Setscrew
Clamping
1 Setscrew
Size
at 90
at 90
Cap Screws
Cap Screws
over Keyway
Screws
over Keyway
Flange to Hub
in Hub
3
3
***
***
***
***
***
***
4
3
***
***
5 1/2**
13
***
***
5
7
13
***
4
13
***
***
6
13
13
5
9
13
15
13
7
13
13
5
9
13
30
13
8
23
23
9
18
23
55
13
9
***
23
9
31
23
55
13
10
***
23
15
50
50
130
13
11
***
23
30
75
50
130
13
12
***
50
60
150
100
250
13
13
***
100
100
75
150
165
***
14
***
100
75
150
165
***
***
15
***
100
135
150
165
***
***
* Torque values apply to hub size when different than flange size.
**Value for socket head clamping screw.
Page 3 - 1195
