9. engineers reference

Formulae

Conversion Factors

Enclosure Ratings

Nut, Bolts and Key Tables

Property Tables

Warranty

Power Jacks Group

South Harbour Road, Fraserburgh, Aberdeenshire, AB43 9BZ, Scotland, UK

tel: +44 (0) 1346 513131 fax: +44 (0) 1346 516827 email: sales@powerjacks.com web: www.powerjacks.com

1

section index

Section Index

1. Screw Jacks (Mechanical Actuators)Cubic Metric Machine Screw ActuatorsMetric and Imperial Machine Screw ActuatorsStainless Steel Actuators - Metric and ImperialMicro-Miniature ActuatorsBall Screw Actuators - Metric and ImperialRoller Screw and Special Actuators

2. Linear ActuatorsEMA - Actuator Series

Rolaram Actuator Series

3. Screw DrivesSpiracon Roller Screw

4. Bevel Gearboxes - Neeter DriveP-Range Series 2000 and 4000

N-Range Series 35, 37, 38, 39 and 40BA-Range Series L, H, and K

5. Reduction GearboxesHelical Worm GearboxesIn-Line Helical Gearboxes

6. Couplings and Drive ShaftsJaw and Gear Flexible Couplings

Drive ShaftsPlummer Blocks

Hand Wheels

7. Electric MotorsStandard 3-Phase MotorsBrake MotorsMotors with Encoders and Forced Ventilation

8. Motion ControlRotary Limit Switches

Proximity and Electro-mechanical Limit SwitchesEncoders - Incremental and Absolute

Position IndicatorsControl Panels

9. Engineers ReferenceFormulae and FactorsStandard Metric Component DataPropertiesWarranty

sectionindex

2

Picture Index

picture index

picture index

Cubic Actuators Metric Ball Screw ActuatorsMetric Actuators Stainless Steel Actuators

EMA Actuators

Ball Screw Rolaram Actuator

Roller Screw Rolaram Actuator

Roller Screw and SpecialActuators

Imperial Actuators Imperial Ball Screw Actuators Spiracon Roller Screw

Special Actuators

3

picture index

pictureindex

P-Range Bevel Gearboxes N-Range Bevel Gearboxes BA-Range Bevel Gearboxes Electric Motors

Couplings andDrive Shafts

Helical Worm Gearboxes

In-Line Helical Gearboxes Proximity and Contact LimitSwitches

EncodersRotary Limit Switches Position Indicators Engineers Reference

4

company profile

Company Profile

Power Jacks Ltd Extensive Site in Fraserburgh, Aberdeenshire

companyprofile

Power Jacks is the largest and most experienced

manufacturer of actuators and mechanical jacks in the UK.

With our range of Power Jacks and Duff-Norton actuators

you don’t just get the product, you also get the knowledge

and experience from a company that has, since 1883,

manufactured quality industrial lifting, positioning and

materials handling equipment.

On our extensive site in Fraserburgh, Aberdeenshire, we have

a wide range of engineering facilities including CAD/CAM/

CAE technology to aid engineering design and manufacture,

an advanced production control system ensuring the

optimum product flow through our comprehensive range of

conventional and CNC machining facilities, which maximises

efficiency and reduces delivery times. This is achieved with

our 100+ highly trained employees, giving Power Jacks the

capability to produce mechanical engineering of the highest

standards.

Quality is a key part of Power Jacks working philosophy and

built into the product from initial design conception, through

production, to installation and after sales service.

There are over two million of our actuators successfully in

operation world-wide. The Power Jacks Group are a globalmarket leader in Linear Actuation Systems.

By specifying a Power Jacks product you are assured of quality,

reliability, performance and value. In the United Kingdom there

are a team of highly experienced sales engineers to assist

customers with their actuation applications whether on site or

by direct communications with the Fraserburgh factory. For

overseas customers there is an extensive distributor network

world-wide.

5

company profile

Power Jacks Standard Product Range Covers:-

Machine Screw Worm Gear Actuators (Screw Jacks)

Ball Screw Actuators (Screw Jacks)

Stainless Steel Actuators (Screw Jacks)

Micro-Miniature Actuators

TracMaster Electro-Mechanical Linear Actuators

EMA Electro-Mechanical Linear Actuators

Rolaram Electro-Mechanical Linear Actuators

Mechanical Jacks

Neeter Drive Bevel Gear Boxes

Reduction Gear Boxes

Power Transmissions

Accessories for Complete Actuator Systems

Actuator Motion Control Systems

Track (Rail) Jacks

Hydraulic Jacks

Hydraulic Cylinders

Hydraulic Pumps and Tools

Both Metric and Imperial Products are available.

As well as these standard products Power Jacks has adedicated engineering team for the design of “Special”products to suit all customer requirements.

These products can be provided as individual partsor single or multiple systems with full engineeringconsultancy available as par t of the service.

companyprofile

For more information contact:

Power Jacks LtdSouth Harbour Road Fraserburgh AB43 9BZTel: +44 (0) 1346 513131Fax: +44 (0) 1346 516827email: sales@powerjacks.comInternet: http://www.powerjacks.com

6

POWER JACKSGroup

NEETER DRIVES P I R A L B E V E L G E A R B O X E S

FORTUNE™

E N G I N E E R I N G L T D

PRECISIONA C T U A T I O N S Y S T E M S

POWER JACKS

Youngs Lifting

company profile

companyprofile

Company Profile

The Power Jacks Group is an engineering group focused on providing customers with the best solution for precision linear actuation,power transmission, mechanical jacking, hydraulic jacking and engineering service. The engineering history of the group dates from1883 and the products and service are supplied to customers world-wide.

The Power Jacks Group Brings Together

Representation

1

engineers reference

sectionnine

Contents

9.1. Useful Formulae for Actuator Calculations 2

9.2. Useful Formulae for Power Transmission Calculations 4

9.3. Conversion Factors 6

9.4. Enclosure Ratings 8

9.5. Metric Nuts and Bolts 9

9.6. Metric Square and Rectangular Parallel Keys 10

9.7. Physical Property Values 11

9.8. Standard SI Prefixes 11

9.9. Limitations of Responsibility 12

9.10. Warranty 12

2

engineers reference

sectionnine

RPM of Worm Shaft * Lifting Screw Lead (mm)

Gear Ratio

9.1. Useful Formulae for Actuator Calculations

9.1.1. Metric Units

9.1.1.1. Lifting Screw Lead

Lifting Screw lead (mm) = Screw Pitch (mm) *Number of Starts on Lifting Screw

Input Torque (Nm) =

Raise Rate (mm/min) =

Raise Rate (mm/min) =

9.1.1.3. Calculation of Actuator Input Torque

Input Power (kW) * 9550

Input Speed (rpm)Input Torque (Nm) =

Load (kN) *Lifting Screw Lead (mm)

2 * π * Actuator Efficiency * Actuator Gear Ratio

9.1.1.4. Calculation of Actuator Input Power

Input Power (kW) =Load (kN) * Raise Rate (mm/min)

60000 * Actuator Efficiency

Input Power (kW) =Load (kN) * Lifting Screw Lead (mm) * Input Speed (rpm)

60000 * Actuator Efficiency * Actuator Gear Ratio

RPM of Worm Shaft

Turns of Worm for 1mm Raise

or alternatively

or alternatively

or alternatively

9.1.1.2. Calculation of the Raise Per Minute with a Given Worm Shaft Speed

When the worm shaft speed is known, the distance the load can be raised per minute can be determined with this formula:

3

engineers reference

sectionnine

or alternatively

RPM of Worm Shaft

Turns of Worm for 1" Raise

RPM of Worm Shaft * Lifting Screw Lead (in)

Gear Ratio

Raise Rate (in/min) =

Raise Rate (in/min) =

9.1.2.3. Calculation of Actuator Input Torque

Input Torque (lbf.in) =Load (lbf) * Lifting Screw Lead (inch)

2 * π * Actuator Efficiency * Actuator Gear Ratio

Input Power (HP) * 63000

Input Speed (rpm)Input Torque (lbf.in) =

or alternatively

9.1.2.4. Calculation of Actuator Input Power

Input Power (HP) =Load (lbf) * Lifting Screw Lead (inch) * Input Speed (rpm)

3.96 x 105 * Actuator Efficiency *Actuator Gear Ratio

or alternatively

Input Power (HP) =Load (lbf) * Raise Rate (inch/min)

3.96 x 105 * Actuator Efficiency

9.1.2. Imperial Units

9.1.2.1. Lifting Screw Lead

Lifting Screw lead (inch) = Screw Pitch (inch) * Number of Starts on Lifting Screw

9.1.2.2. Calculation of the Raise Per Minute with a Given Worm Shaft Speed

When the worm shaft speed is known, the distance the load can be raised per minute can be determined with thisformula:

4

engineers reference

sectionnine

9.2. Useful Formulae for Actuator Calculations

9.2.1. Power

9.2.2. Torque

Lifting Motion

FR = µ * m * g FR = µ * W

T * n9550

P =T * n63000

P =

FR * v1000

P =FR * v33000

P =

m * g * vη * 1000

P = W * vη * 33000

P =

Linear Motion

Rotary Motion

Metric Imperial

T = FR * r T = T * r

P * n9550

T =P * n

63000T =

Symbol

P

T

FR

m

W

g

ν

η

µ

n

r

Power

Torque

Resistance due to Friction

Mass

Weight

Gravitational Acceleration

Velocity

Efficiency

Coefficient of Friction

Rotational Speed

Radius

kW

Nm

N

kg

-

9.81 ms-2

ms-1

decimals

decimals

rpm

m

HP

lbf.in

lbf

-

lb

32.185 ft-2

ft/min

decimals

decimals

rpm

in

Quantity Metric Units Imperial Units

5

engineers reference

sectionnine

9.2.4. Acceleration or Braking Time

9.2.3. Moment of Inertia

1

2J = * m * rod

2

1

32J = * π * ρ * dod

4

J = 0.098 * ρ * I *dod4

1

2WK2 = * W * rod

2

π32

WK2 = * r * I * dod4

WK2 = 0.1 * ρ * I *dod4

1

32J = * π * ρ * I * (dod

4 -did4)

J = 0.098 * ρ * I * (dod4 -did

4)

1

2WK2 = * W * (rod

2 -rid2)

π32

WK2 = * ρ * I * (dod4 -did

4)

WK2 = 0.1 * ρ * I * (dod4 -did

4)

1

2J = * m * (rod

2 -rid2)

Solid Cylinder

Hollow Cylinder

Metric Imperial

J * n

9.55 * Tacctacc =

WK2 * n

308 * Tacctacc =

Symbol

J

WK2

Tacc

m

W

rod

rid

dod

did

I

ρ

tacc

n

Moment of Inertia (metric)

Moment of Inertia (imperial)

Torque due to Acceleration or Braking

Mass

Weight

Outer Radius

Internal Radius

Outer Diameter

Internal Diameter

Length

Density

Time for Acceleration or Braking

Rotational Speed

kgm2

-

Nm

kg

-

m

m

m

m

m

kg/m3

s

rpm

-

lb.ft2

lbf.ft

-

lb

ft

ft

ft

ft

ft

lb/ft3

s

rpm

Quantity Metric Units Imperial Units

6

engineers reference

sectionnine

9.3. Conversion Factors

Force / Weight

1 N

1 kgf

1 kp

1 lbf

Mass

1 kg

1 Tonne

1 lb

1 Ton (Short)

1 Ton

Length

1 m

1 mm

1 inch

1 ft

m

1

0.001

0.0254

0.3048

mm

1000

1

25.4

304.8

inch

39.370

0.03937

1

12

ft

3.2808

3.28 x 10-3

0.0833

1

kg

1

1000

0.45355937

907.185

1016.05

Tonne

0.001

1

4.536 x 10-4

0.907185

1.016

lb

2.2046

2204.6

1

2000

2240

Ton

9.842 x 10-4

0.9842

4.464 x 10-4

0.8929

1

Ton (Short)

1.1023 x 10-3

1.1023

5 x 10-4

1

1.120

Speed

1 m/s

1 mm/s

1 ft/s

1 in/s

m/s

1

0.001

0.3048

0.0254

mm/s

1000

1

304.8

25.4

ft/s

3.2808

3.28 x 10-3

1

0.0833

in/s

39.37

0.03937

12

1

N

1

9.80665

9.80665

4.44822

kgf

0.1019716

1

1

0.45359237

kp

0.120

1

1

0.4536

lbf

0.224809

2.2046

2.2046

1

Torque / Work

1 Nm

1 kfg.cm

1 lbf.in

1 lbf.ft

Nm

1

9.80665 x 10-2

0.1129848

1.35582

kgf.cm

10.19716

1

1.1521

13.825

lbf.in

8.8507

0.8679

1

12

lbf.ft

0.73756

0.07233

0.08333

1

7

engineers reference

sectionnine

9.3. Conversion Factors

Stress / Pressure

1 MPa (N/mm2)

1 N/m2

1 kg/cm2

1 lbf/inch2

1 lbg/ft2

1nertia

kg.m2 (mr2)

1 kpms2

1 lbf.ft2 (WK2)

1 lbf.in2 (WK2)

Power

1 kW

1 Nm/min

1 kgf.m/s

1 hp

1 lbf.ft/min

kW

1

1.667 x 10-4

9.807 x 10-3

0.7457

2.261 x 10-5

Nm/min

60000

1

588.6

44741

1.3566

kgf.m/s

10.20

1.699 x 10-3

1

76.04

2.3056 x 10-3

hp

1.34

2.235 x 10-5

0.01315

1

3.03 x 10-5

lbf.ft/min

44220

0.7374

433.73

33000

1

kg.m2 (mr2)

1

9.807

0.0421

2.9264 x 10-4

kpms2

0.10197

1

4.30 x 10-3

0.6192

lbf.ft2 (WK2)

23.73

232.6

1

6.944 x 10-3

lbf.in2 (WK2)

3417.2

33488

144

1

Temperature

T °F

T °C

(T °C x 1.8) + 32°

(T °F -32) / 1.8

MPa (N/mm2)

1

1 x 10-6

9.807 x 10-2

9.8947 x 10-3

4.7879 x 10-5

kg/cm2

10.2

10.2 x 10-6

1

0.070307

0.488 x 10-3

N/m2

1 x 10-6

1

9.81 x 103

6.89 x 103

47.88026

lbf/inch2

145.039

145 x 10-6

14.2233

1

6.94 x 10-3

lbf/ft2

20885.6

20.88 x 10-6

2.05 x 10

144

1

8

engineers reference

sectionnine

9.4. Enclosure Ratings

9.4.1. IEC Ratings

1 When only one characteristic numeral is used the second numeral is replaced by an ‘X’.

2 A ‘W’ inserted after the ‘IP’ indicates suitable for a specified weather condition (conditions and features specified by manufacturer).

9.4.2. NEMA and IEC Equivalent Enclosures

Since the IEC degree of protection for enclosed equipment is defined differently from NEMA type enclosure protection, andmethods of test are different, exact correlation between IEC IP-type designations and NEMA types is not possible. It is possible tomake rough comparisons, which may result in certain applications. The common NEMA type designations compare with IECdesignations as follows:

No special protection

A large surface of the body, such as hand (but no protectionagainst deliberate acces.) Solid objects >50 mm diameter.

Fingers or similar objects not exceeding 80mm in length.Solid objects >12mm in diameter.

Tools, wires, etc. of diameter or thickness >2.5mm.Solid objects >1mm diameter.

Wires or strips of thickness >1mm.Solid objects exceeding 1mm diameter.

Ingress of dust is not totally prevented, but dust does notenter in sufficient quantity to interfere with satisfactoryoperation of the equipment.

No ingress of dust.

No special protection

Dripping water (vertically falling drops).

Vertically dripping water when the enclosure is tilted at anyangle up to 15º from its normal position.

Water falling as a spray at an angle of 60º from the vertical.

Water splashed against the enclosure from any direction.

Water projected by a nozzle against the enclosure.

Water from heavy seas or projected in powerful jets.

Ingress of water in a harmful quantity not possiblewhen the enclosure is immersed under defined conditions ofpressure and time.

Submersible under defined conditions of pressure and time.

1st Digit : Solid Ingress 2nd Digit : Liquid Ingress

0

1

2

3

4

5

6

0

1

4

5

6

7

8

2

3

IP2XProtected against solid objects greater than 12mm.Test: Metallic test finger and 12mm sphere tests. No IEC rust resistance test.

Dust protected. Protected against splashing water. Test: Dustand oscillating sprinkler tests. No IEC rust resistance test.

Protected against solid objects greater than 2.5mm. Protectedagainst splashing water. Test: 2.5mm rod and oscillatingsprinkler tests. No IEC rust resistance or icing tests.

Dust-tight and protected against water jets.Test: Dust and spray nozzle tests. no rust resistance orexternal icing test.

Dust-tight and protected against water jets.Test: Dust and spray nozzle tests. No rust resistance orexternal icing test.

No IEC equivalent.

No IEC equivalent.

Dust-tight and protected against dripping water.Test: Dust and rain simulator tests. No IEC rust resistance test.

Dust-tight.Test: Dust test. No IEC oil-tightness or rust resistance tests.

NEMA 1General protection of people from live parts. Protection against falling dirt. Test: 1/8" to 1/2" (3.175to 12.7mm) rod entry test and rust resistance tests.

Dust-tight and sleet resistant.Test: Rain, dust, external icing and rust resistance test.

Rain-proof and sleet resitant.Test: Rod entry 1/8" to 1/4" (3.175 to 6.35mm), rain, external icing and rust resistance tests.

Water-tight and dust-tight.Test: Hosedown, rust-resistance and external icing tests.

Water-tight, dust-tight and corrosion resistance.Test: Hosedown, corrosion resistance and external icing tests.

Hazardous gas.

Hazardous dust.

Dust-tight and drip-tight.Test: Drip, dust and rust resistance tests.

Oil tight and dust tight.Test: Oil-tightness and rust-resistance tests.

NEMA Type Nearest IEC Equivalent

NEMA 3

NEMA 3R

NEMA 4

NEMA 4X

NEMA 7

NEMA 9

NEMA 12

NEMA 18

1

IP54

IP34

IP65

IPW65

-

-

IP61

IP6X 1

2

9

engineers reference

sectionnine

9.5. Metric Nuts and Bolts

A

R

H

D

T

D

W

K

Note: 1. All dimensions in millimetres.

2. Sizes in brackets are non-preferrred standards.

3. All dimensions are maximum sizes.

Hexagon Bolt

Socket Head Cap Screw

Threaded End

Length

Threaded End

Length

Thread Size

D

M3

M4

M5

M6

M8

M10

M12

(M14)

M16

(M18)

M20

(M22)

M24

(M27)

M30

(M33)

M36

(M39)

M42

Pitch

0.50

0.70

0.80

1.00

1.25

1.50

1.75

2.00

2.00

2.50

2.50

2.50

3.00

3.00

3.50

3.50

4.00

4.00

4.50

A

5.50

7.00

8.00

10.00

13.00

17.00

19.00

22.00

24.00

27.00

30.00

32.00

36.00

41.00

46.00

50.00

55.00

60.00

65.00

H

2.125

2.925

3.650

4.150

5.650

7.180

8.180

9.180

10.180

12.215

13.215

14.215

15.215

17.215

19.620

21.260

23.260

25.260

26.260

K

2.40

3.20

4.00

5.00

6.50

8.00

10.00

11.00

13.00

15.00

16.00

18.00

19.00

22.00

24.00

26.00

29.00

31.00

34.00

R

5.50

7.00

8.50

10.00

13.00

16.00

18.00

21.00

24.00

27.00

30.00

33.00

36.00

40.00

45.00

50.00

54.00

-

63.00

T

3.00

4.00

5.00

6.00

8.00

10.00

12.00

14.00

16.00

18.00

20.00

22.00

24.00

27.00

30.00

33.00

36.00

-

42.00

W

2.5

3.0

4.0

5.0

6.0

8.0

10.0

12.0

14.0

14.0

17.0

17.0

19.0

19.0

22.0

24.0

27.0

-

32.0

Hexagon Bolts & Nuts Sockets Head Cap Screw

Hexagon Nut

10

engineers reference

sectionnine

9.6. Metric Square and Rectangular Parallel Keys

Enlarged Detail of Key and Keyways

X

X

B

H

T2T1

D - T1 D + T2

Section X-X

T2

T1

R

H/2H/2

Note: For full range and further informtion refer BS 4235: Pt 1: 1972

SymbolNominalDiameter

D

Key Keyway

B x Hwidth

xthick-ness

Shaft(H9)

Over Incl

Free Normal Shaft, T1

DepthWidth, B

Tolerance for class of fitNom

Radius, R

Hub, T2Close andInterference

Hub(D10)

Shaft(N9)

Hub(Js9)

Shaft andHub(P9)

Nom. Tol. Nom. Tol. Max. Min.

6

8

10

12

17

22

30

38

44

50

58

65

75

85

95

110

130

150

170

8

10

12

17

22

30

38

44

50

58

65

75

85

95

110

130

150

170

200

2

3

4

5

6

8

10

12

14

16

18

20

22

25

28

32

36

40

45

+0.025

0

+0.030

0

+0.036

0

+0.043

0

+0.052

0

+0.062

0

+0.060

+0.020

+0.078

+0.080

+0.095

+0.040

+0.120

+0.050

+0.149

+0.065

+0.180

+0.080

-0.004

-0.029

0

-0.030

0

-0.036

0

-0.043

0

-0.052

0

-0.062

+0.012

-0.012

+0.015

-0.015

+0.018

-0.018

+0.021

-0.021

+0.026

-0.026

+0.031

-0.031

-0.006

-0.031

-0.012

-0.042

-0.015

-0.051

-0.018

-0.061

-0.022

-0.074

-0.022

-0.088

1.2

1.8

2.5

3.0

3.5

4.0

5.0

5.0

5.5

6.0

7.0

7.5

9.0

9.0

10.0

11.0

12.0

13.0

13.0

+0.1

0

+0.2

0

+0.3

0

+0.1

0

+0.2

0

+0.3

0

0.08

0.16

0.25

0.40

0.70

0.16

0.25

0.40

0.60

1.00

1.0

1.4

1.8

2.3

2.8

3.3

3.3

3.3

3.8

4.3

4.4

4.9

5.4

5.4

6.4

7.4

8.4

9.4

10.4

2 x 2

3 x 3

4 x 4

5 x 5

6 x 6

8 x 7

10 x 8

12 x 8

14 x 9

16 x 10

18 x 11

20 x 12

22 x 14

25 x 14

28 x 16

32 x 18

36 x 20

40 x 22

45 x 25

D

11

engineers reference

sectionnine

9.7. Physical Property Values, at 20°C

9.8. Standard SI Prefixes * †

* If possible use multiple and submultiple prefixes in steps of 1000.

† Spaces are used in SI instead of commas to group numbers to avoid confusion with the practise in some Europeancountries of using commas for decimal points.

‡ Not recommened but sometimes encountered.

Material

Density, ρ (kg/m3)

Young's Modulus, E

(GN/m2)

Shear Modulus, G

(GN/m2)

Bulk Modulus, K

(GN/m2)

Poisson's Ratio, ν

Coefficient of Thermal

Expansion x 10-6/K

Specific Heat J/kg K

Carbon Steel

7860

207

79.3

172

0.292

12

460

Brass 65/35

8450

105

38

115

0.35

19

420

Copper

8910

119

44.7

130

0.326

17

420

Stainless Steel

7750

190

73.1

178

0.305

14

460

Aluminium Alloys

2710

710

26.2

57.5

0.334

22

920

Name

exa

peta

tera

giga

mega

kilo

hecto

deca

deci

centi

milli

micro

nano

pico

femto

atto

Symbol

E

P

T

G

M

k

h

da

d

c

m

µ

n

p

f

a

Factor

1 000 000 000 000 000 000 = 1018

1 000 000 000 000 000 = 1015

1 000 000 000 000 = 1012

1 000 000 000 = 109

1 000 000 = 106

1 000 = 103

100 = 102

10 = 101

0.1 = 10-1

0.01 = 10-2

0.001 = 10-3

0.000 001 = 10-6

0.000 000 001 = 10-9

0.000 000 000 001 = 10-12

0.000 000 000 000 001 = 10-15

0.000 000 000 000 000 001 = 10-18

‡

‡

‡

‡

Note: Values given are representative. Exact values may vary with composition and processing, sometimes greatly.

12

engineers reference

sectionnine

9.9. Limitation of Responsibility

The ratings given in this catalogue were compiled using standard engineering procedures. The ratings are designed to guide thecustomer in the selection of a unit. We do not guarantee the ratings in specific applications. Prototype testing of every application isrecommended before production. Our engineering facilities are available for consultation at all times. Please ask us for assistance withlinear motion and drive application problems. This catalogue is designed to assist in the selection of a suitable linear motion or powertransmission product for economical, long and trouble free service.

Due to Power Jacks policy of continuous improvement designs may be subject to change without notice. Please ask for certifieddrawings.

9.10. Warranty

Subject to the condition stated herein. Power Jacks will repair or replace, without charge, any parts proven to Power Jacks satisfactionto have been defective in material or workmanship. Claims must be made within one year after date of shipment. Power Jacks will notrepair or replace any parts that become inoperative because of improper maintenance, eccentric loading, overloading, chemical orabrasive action, excessive heat, or other abuse. Equipment and accessories not of Power Jacks manufacture are warranted only to theextent that they are warranted by the manufacturer, and only if the claimed defect arose during normal use, application and service.Equipment, which has been altered or modified by anyone without Power Jacks authorisation, is not warranted by Power Jacks. EXCEPTAS STATED HEREIN, POWER JACKS MAKES NO OTHER WARRANTIES, EXPRESS OR IMPLIED INCLUDING WARRANTIES OFMERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

WARNING: The equipment shown in this catalogue is intended for industrial use only and should not be used to lift, support, orotherwise transport people unless you have a written statement from Power Jacks Limited which authorises the specific unit as used inyour application suitable for moving people.

© Power Jacks Limited 1987, Aberdeenshire, Scotland, United Kingdom.

© Neeter Drive is a trading name of Power Jacks Limited.

© Precision Actuation Systems is a Power Jacks Company.

© Duff-Norton Company 1986, Charlotte, North Carolina, USA.

© Youngs Lifting is a trading name of Power Jacks Limited.

© Fortune Engineering is a trading name of Power Jacks Limited.

© Rolaram® is a trademark of Power Jacks Limited.

All rights reserved by Power Jacks Limited. May not be copied in whole or in part.