primeflex ®

The new, top-quality steel bellows coupling

.de

l Plug-in connection
l Backlash-free
l Easy to de-install
l Cost-effective
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P.933.V02.GB your reliable partner

 primeflex ®

primeflex®
the new, top-quality steel bellows coupling
If innovative and market-leading shaft coupling technology designed to secure your future is important to you,
have a closer look at our new primeflex®.
This product contains all the qualities you should expect from a “first-class“ steel bellows coupling - at an excep-
tionally favourable price.

l Can be de-installed even after longer operating periods

without damaging the steel bellows Patent
g
l Plug-in connection pendin
l Backlash-free
l Extremely compact and very high performance density
l Easy to install via clamping or shrink disk connections
l Frictionally-locking and positive-locking
shaft-hub connections
l Excellent misalignment capability
l Can be variably dimensioned via the modular system
l Cost-effective

Size
Technical Data 1 2 3
Nominal torque 1) TKN [Nm] 24 60 120
Minimum d min [mm] 12 19 25
Hub bore Ød Maximum without keyway d max [mm] 25 35 45
Maximum with keyway d max [mm] 21 30 38
Minimum d min [mm] 12 19 25
Hub bore Ød1 Maximum without keyway d max [mm] 20 30 40
Maximum with keyway d max [mm] 17 25 35
Minimum d min [mm] 10 15 18
Hub bore Ød2 Maximum without keyway d max [mm] 20 30 40
Maximum with keyway d max [mm] 17 25 35
Maximum speed nmax [rpm] 8 000 6 000 4 000
Tightening torque ± 5% TA1 [Nm] 10 17 40
Key width, screw 1 SW1 [mm] 4 5 6
Screws
Tightening torque ± 5% TA2 [Nm] 1,8 4,1 8,1
Key width, screw 2 SW2 [mm] 2,5 3 4
Permitted axial Type 933.3__.1 ∆Ka [mm] ± 0,1 ± 0,15 ± 0,15
displacement Type 933.5__.1 ∆Ka [mm] ± 0,2 ± 0,25 ± 0,25
Permitted Permitted radial Type 933.3__.1 ∆Kr [mm] 0,1 0,1 0,1
misalignments 2) misalignment Type 933.5__.1 ∆Kr [mm] 0,2 0,3 0,3
Permitted angu- Type 933.3__.1 ∆Kw [°] 1 1 1
lar misalignment Type 933.5__.1 ∆Kw [°] 1 1 1
Axial spring Type 933.3__.1 Cax [N/mm] 140 180 240
rigidity Type 933.5__.1 Cax [N/mm] 70 90 120
Spring rigidities
Type 933.3__.1 CT [Nm/rad] 18 000 44 000 100 000
Torsion
Type 933.5__.1 CT [Nm/rad] 9 000 22 000 50 000
We reserve the right to make dimensional and constructional changes.
Smaller bores than the finish bores d, d1 and d2 mentioned here are available on request.
1) The nominal torque may be temporarily exceeded by 50 %. Please contact the manufacturers for details.
 2) The permitted misalignments must not simultaneously reach their maximum value.
primeflex ®
L1 L3
l1 l l2 l
l4 l4 l4
l5
Ød1H7

Ød2H7
ØdH7

ØdH7
ØD

ØD
l5

l5
Type 933.333.1 without keyway Type 933.335.1 without keyway
Type 933.366.1 with keyway Type 933.367.1 with keyway

L L2
l1 l l2 l
l4 l4 l4
SW1 SW2
l5

Ød2H7
Ød1H7

ØdH7
ØdH7

ØD
ØD

l5
l5

Type 933.533.1 without keyway SW1 Type 933.535.1 without keyway SW1
Type 933.566.1 with keyway Type 933.567.1 with keyway

Size Mass moments Size

Dimensions 1 2 3 of inertia [10-6 kgm2] 1 2 3
D 47 60 79 Type 933.533.1 73,9 267 983
L 77 93 117 Type 933.333.1 63,6 219 810
L1 62 74 92 Type 933.535.1 95,6 341 1231
L2 78 96 118 Type 933.335.1 85,3 293 1058
L3 63 77 93
Size
l 23 26 32 Weights [kg]
1 2 3
l1 30 38 47 Type 933.533.1 0,234 0,487 1,031
l2 31 41 48 Type 933.333.1 0,203 0,407 0,865
l4 6,5 8 10,5 Type 933.535.1 0,292 0,607 1,259
l5 16,7 22,5 29,5 Type 933.335.1 0,261 0,527 1,093

Size selection
The coupling is dimensioned via the maximum torque Mmax
occurring in the system and the appropriate service and Temperature
temperature factors. The calculated torque M must be smaller than 50 °C 80 °C 100 °C 120 °C
the nominal torque on the selected coupling. Temperature factor ft 1 1,1 1,2 1,5

M = Mmax × ft × fB [Nm] Load

Even Uneven Impacts
Mmax = Maximum occurring torque Service factor fB 1,5 2 2,5 - 4
ft = Temperature factors
In our experience, fB values of 1,5 should be calculated for drives in
fB = Service factors machine tools (servo motors).

Installation Guidelines
The coupling must be pre-tensioned to pressure between 0,5 and 1,0 mm during installation, based on the non-tensioned installation
dimensions L, L1, L2 and L3. Both hubs are to be mounted onto the shafts so that this pre-tension is achieved after the components are
plugged together. Only with this pre-tensioning can the coupling work permanently backlash-free and with full torsional rigidity. 
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