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Since 1958
Helical Products Company, Inc.

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We manufacture single piece Flexible Couplings,  U-Joints, Machined Springs, and Power Transmission Couplings utilizing HELI-CAL® Flexure technology

 

 

 

 

 

 

 

 

 

 

 

 

 

HELICAL PF SERIES, POWERFLEX, Technical Data

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STANDARD BORE DIAMETER+.002 / - .000 in
(+0.05 / - .00 mm)

PERFORMANCE DATA

PART NUMBER

DIMENSIONAL INFORMATION

ATTACHMENT SCREW

WEIGHT

Max
w/RELIEF
see note 1
in
(mm)

Max
w/STEP BORE
see note 2
in
(mm)

Min

in
(mm)

Momentary Dynamic Torque
see note 3
lbin
(Nm)

Torsional Stiffness

lbin/rad (Nm/rad)

Parallel Offset

in
(mm)

 

OD

in
(mm)

L

in
(mm)

L1

in
(mm)

B

in
(mm)

Size

Qty

Seating Torque

lbin
(Nm)

lb
(kg)

.875
(22.00)

1.000
(25.00)

.500
(12.00)

250
(28)

2,150
(243)

.025
(.65)

PFA200

2.00
(50.8)

4.00
(101.6)

3.12
(79.2)

.82
(20.8)

M5

4

55
(6.2)

0.87
(.39)

530
(60)

5,940
(672)

.025
(.65)

PFS200

65
(7.3)

2.31
(1.05)

1.125
(28.00)

1.375
(35.00)

.500
(12.00)

480
(55)

4,070
(460)

.030
(.75)

PFA250

2.50
(63.5)

4.75
(120.7)

3.70
(94.0)

1.00
(25.4)

M6

5

90
(10)

1.68
(.76)

1,025
(115)

11,270
(1,273)

.030
(.75)

PFS250

110
(12)

4.46
(2.02)

1.375
(35.00)

1.750
(44.00)

.625
(16.00)

840
(95)

7,060
(797)

.035
(.85)

PFA300

3.00
(76.2)

5.50
(139.7)

4.47
(113.5)

1.13
(28.7)

M6

5

90
(10)

2.70
(1.22)

1,800
(205)

19,530
(2,207)

.035
(.85)

PFS300

110
(12)

7.31
(3.32)

Angular:  4 degrees   Axial:  +/1-.020in (.50mm)  Max. RPM:  6,000                    
Conversion from Horsepower to Torque:  (HP x 63,000) ÷ RPM = Trq (lbin) or (HP x 7,119) ÷ RPM = Trq (Nm)
Notes

1. Shaft sizes less than or equal to the Max w/RELIEF can penetrate to the center of the coupling. See drawing.

2. Shaft sizes greater than the Max w/ RELIEF up to the Max w/STEP BORE can only penetrate to the B dimension.
    See drawing.

3. Dynamic torque ratings are momentary values. For non-reversing applications divide by 2.

Divide by 4 for reversing applications. Should the torque ratings be marginal for your application, contact us for analysis.

The PF Series (PowerFlex) power transmission coupling uses the proven HELI-CAL Flexure to provide reliable torque transmission between shafts, while allowing for substantial angular and parallel misalignment compensation. The PF Series also incorporates the convenience of interchangeable bushings, providing for quick and easy changes in bore sizes, while using the same HELICAL FLEXIBLE COUPLING center section. This means both fast initial delivery (separate bushings and center section are assembled for shipment from inventory), and the ability to change the coupling’s bore sizes without remachining when the coupling is already in use (just order new bushings precision bored to your needs).

The relief feature allows the shafts to penetrate into the Flexure area. With step bores, the shafts are inserted into the tapered bushings only, to dimension B.

To make things even simpler, the need for keyways has been eliminated. By designing the tapered bushings to hold more torque than the maximum torque capacity of the coupling, sizing and placement of keyways is no longer an issue. The PF Series is available in both aluminum and corrosion resistant steel (CRES).

Attachment: Tapered bushing

Materials: PFA: 7075-T6 Aluminum alloy center-section and bushings

PFS: 15-5 PH
H900 CRES center section 303 CRES bushings

 

PF Series Flexible Couplings · Standard Coupling Guide · Home

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Phone: 805-928-3851 · Fax: 805-928-2369
 sales@heli-cal.com · engineering@heli-cal.com

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