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Specifications

Performance Specifications

Performance Table Instructions 
When reviewing and Duff-Norton Actuator Performance Specification Table, as part of the process of selecting the best-suited actuator for your application, there are several important worm-gear ratios to consider.
Standard Ratio - is frequently chosen when higher speeds and efficiency ratings are desired.
Optional Ratio - is frequently chosen when the application requires higher lifting capacities, lower speeds, or to ease the use of a handwheel.
Numeric Ratio - is frequently chosen for applications requiring fine adjustments, higher lifting capacities, lowerspeeds, the easy use of a handwheel, self locking applications, and also offers the benefit of an even number of worm input turns per inch of stroke.

Performance Specifications - Machine Screw Actuator Stainless Steel

Capacity (tons) - 17-4PH Worn

2

5

10

15

20

25

30

35

50

100

Capacity (tons) - 316 SSWorn

0.67

1.66

3.33

5.00

6.66

8.33

9.9

11.66

16.66

33.33

Lifting Screw

Diameter (in)

1

1-1/2

2

1-1/4

2-1/2

3

3

3-3/4

4-1/2

6

Pitch (Std. & Opt.)

0.250

0.375

0.500

0.500

0.500

0.666

0.666

0.666

0.666

0.750

Pitch (Numerical)

—

0.250

0.250

0.250

0.250

0.320

0.320

0.320

0.320

—

Type

ACME

ACME

ACME

ACME

ACME

ACME

ACME

ACME

Mod. Sq.

Mod. Sq.

Worm Gear Ratios

Standard

6:1

6:1

8:1

8:1

8:1

10-2/3:1

10-2/3:1

10-2/3:1

10-2/3:1

12:1

Optional No. 1

24:1

24:1

24:1

24:1

24:1

32:1

32:1

32:1

32:1

36:1

Optional No. 2

12:1

12:1

—

—

—

—

—

—

—

—

Numeric Ratio

25:1

25:1

25:1

25:1

25:1

32:1

32:1

32:1

32:1

—

Turns of Worm for

1 inch Stroke

Standard

24

16

16

16

16

16

16

16

16

16

Optional No. 1

100

67

50

50

50

48

48

48

48

48

Optional No. 2

50

33

—

—

—

—

—

—

—

—

Numeric Ratio

100

100

100

100

100

100

100

100

100

100

Worm Torque at No

Load (in-lb)

Standard

5

10

20

20

30

40

40

50

100

200

Optional No. 1

5

10

20

20

30

40

40

50

100

200

Optional No. 2

5

10

—

—

—

—

—

—

—

—

Numeric Ratio

5

10

20

20

30

40

40

50

100

200

Maximum Horsepower

per Actuator

Standard

2

4

5

5

5

8

8

8

15

25

Optional No. 1

1/2

3/4

1-1/2

1-1/2

1-1/2

1-1/2

1-1/2

1-1/2

6

11

Optional No. 2

3/4

2

—

—

—

—

—

—

—

—

Numeric Ratio

1/2

3/4

1-1/2

1-1/2

1-1/2

1-1/2

1-1/2

1-1/2

6

11

Worm Torque at Full Load* (in-lb)

17-4PH Worm

Standard

120

450

750

1430

2050

2700

2640

4000

7500

16000

Optional No. 1

50

185

400

820

1170

1700

1685

2400

4200

8600

Optional No. 2

75

275

—

—

—

—

—

—

—

—

Numeric Ratio

48

175

370

640

925

1500

1800

2411

4040

—

Worm Torque at Full Load* (in-lb)

316SS Worm

Standard

42

150

253

471

675

926

940

1366

2566

5466

Optional No. 1

19

66

141

276

394

593

600

833

1466

3000

Optional No. 2

27

95

—

—

—

—

—

—

—

—

Numeric Ratio

25

57

67

109

144

336

635

350

619

—

Efficiency Rating (%) - 17-4PH Worm

Standard

22.1

22.1

26.5

20.9

22.0

22.4

22.4

17.4

13.3

12.4

Optional No. 1

13.3

9.1

16.6

12.1

12.8

11.8

11.8

9.7

7.9

7.7

Optional No. 2

17.7

18.1

—

—

—

—

—

—

—

—

Numeric Ratio

13.3

9.1

8.6

7.5

6.9

5.3

5.3

4.6

3.9

—

Efficiency Rating (%) - 316SS Worm

Standard

20.3

21.1

25.1

20.3

18.8

17.9

17.9

17.0

12.9

12.1

Optional No. 1

10.9

12.0

15.0

11.5

10.7

9.3

9.3

9.3

7.5

7.4

Optional No. 2

15.5

16.8

—

—

—

—

—

—

—

—

Numeric Ratio

10.9

8.0

7.5

5.8

5.4

4.5

5.0

4.5

3.6

—

Key Torque (in-lb) - 17-4PH Worm

Std. & Opt.

460

1750

4700

7580

10625

14000

16800

26500

47110

118200

Numeric Ratio

460

1599

4077

6645

9369

11474

13770

18561

30970

—

Key Torque (in-lb) - 316SS Worm

Std. & Opt.

153

581

1565

2527

3538

4665

5600

8828

15697

39396

Numeric Ratio

211

460

551

959

1199

2328

2800

2358

4087

—

Weight with 6 inch Stroke (Raise) (lb)

17

35

52

66

93

160

160

240

410

1200

Weight per additional 1 inch Stroke (Raise) (lb)

0.3

0.9

1.4

1.5

2.6

2.5

2.5

3.7

5.5

9.0

Note: For loads from 25% to 100% of actuator capacity, torque requirements are approximately proportional to the load. Contact Duff-Norton Customer Service for motorized performance.

Models

Stainless Steel Actuator Cut-Away Diagram
Stainless-Steel-Machine-Screw-model.jpg

2 to 100 Ton Capacity

  • Anti-backlash models available Upright and inverted rotating screw models with traveling nut available
  • Sealed gear capacity keeps water and other contaminant's out
  • Available with keyed lifting screws for translating screw models
  • Can be retrofitted into applications were Duff-Norton non-stainless steel actuators have previously been used