Quick Ref: MSAT-4045
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Machine Screwjack Actuator, 1/4t to 1t

Model:  MSAT-4045

Type
Actuator Type
Part N° Rated Load (lbs) Diameter of Lifting Screw Base Size (inch) Weight with Base Raise of 6" (lbs) Weight for Each Additional 1" Raise (lbs) Guide Price Quantity
4045-T8756 500 1/2 .250 Pitch ACME 2 1/4 x 4 2.3 0.1 Quote Required
4045-T8757 1000 5/8 .125 Pitch ACME 2 1/4 x 4 2.3 0.1 Quote Required
4045-T8758 2000 3/4 .200 Pitch ACME 3 3/4 x5 5.0 0.3 Quote Required
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Screwjack Actuator.

Machine Screw Jack

Machine Screw Rotating Jack

These screw actuators offer a positive mechanical action, precise positioning and uniform lifting speeds.

The standard configurations include, upright or inverted units with translating or rotating lifting screws, with top plates, threaded or clevis end fittings.

They can be controlled accurately for positioning within thousands of one inch.

Unevenly distributed loads can be lifted with uniform speeds.

All actuators are designed and built to be positive acting, giving accurate response to motive power.

Top Plate Clevis End Threaded end
Top Plate
Clevis End
Threaded End

Rotating Inverted Machine Screwjack Actuator

Inverted Jack Dimensions
Model Number Rating A (in) B (in) C (in) D (in) F (in) G (in) H (in) I (in) J (in) K (in)
DM-2556 1/4 TON Raise + 1 1/2 5 / 8 2 3/8 3 / 8 0.312 7 / 8 3 / 8 2 1/4 4 Holes- 9/32 Dia. on 1 3/4 Dia. B.C. 1
DM-2626 1/2 TON   
Raise + 1 7/8 5 / 8 2 3/8 3 / 8 0.437 7 / 8 3 / 8 2 1/4   4 Holes- 9/32 Dia. on 1 3/4 Dia. B.C. 1
 DM-2502  1 TON  Raise + 1 3/4 5 / 8
 3 1/4  1 / 4 0.500
 1 1/2  1 1/2  1 1/2 4 Holes- 13/32 Dia. on 2 3/8 Dia. B.C.
1 1/2

Rotating Upright Machine Screwjack Actuator

Upright Jack Dimensions
Model Number Rating A (in) B (in) C (in) F (in) G (in) H (in) I (in) J (in) K (in)
UM-2556 1/4 Ton Raise + 1 1/2 5 / 8 2 3/8 0.312 7 / 8 3 / 8 2 1/4 4 Holes- 9/32 Dia. on 1 3/4 Dia. B.C. 1
UM-2626
1/2 Ton Raise + 1 7/8 5 / 8 2 3/8 0.437 7 / 8 3 / 8 2 1/4  4 Holes- 9/32 Dia. on 1 3/4 Dia. B.C. 1
UM-2502 1 Ton Raise + 1 3/4 5 / 8 3 1/4 0.500 1 1/2 1 / 2 3 1/4 4 Holes-13/32 Dia. on 2 3/8 Dia. B.C. 1 1/2

Rotating Screwjack Specifications

Standard Actuator Number Upright UM2556 UM2626 UM2502
Inverted DM2556 DM2626 DM2502
Special Actuator Number Upright UM3056 UM3626 UM3502
Inverted DM3056 DM3626 DM3502
Rated Load (lb) 500 1000 2000
Diameter of Lifting Screw (in) 1/2 .250 Pitch ACME 5/8 .125 Pitch ACME 3/4 .200 Pitch ACME
Base Size (in)
2 1/4 x 4 2 1/4 x 4 3 3/4 x5
Worm Gear Ratios Standard Ratio 5:1 5:1 5:1
Optional - - 20:1
Turns of Worm for 1" Raise Standard Ratio 20 40 25
Optional - - 100
Maximum H.P Per Acutator Standard Ratio 1/3 1/3 1/2
Optional - - 1/4
Torque at Full Load* (in-lbs) Standard Ratio 13 21 55
Optional - - 25
Jack Efficiency Rating (%) Standard Ratio 33.0 20.0 24.5
Optional - - 14.0
Weight with Base Raise of 6" (lb) 2.3 2.3 5.0
Weight for Each Additional 1" Raise (lb) 0.1 0.1 0.3

Translating Screwjack Specifications

Anti-Backlash
Actutator Number 2555 2625 2501 4555 4625 4501
Rated Load (lb) 500 1000 2000 500 1000 2000
Diameter of Lifting Screw (in) 1/2 .250 Pitch ACME 5/8 .125 Pitch ACME 3/4 .200 Pitch ACME 1/2 .250 Pitch ACME 5/8 .125 Pitch ACME 3/4 .200 Pitch ACME
Closed Height* (in) 4 4 4 1/2 4 4 5
Base Size (in) 2 1/4 x 4 2 1/4 x 4 2 3/4 x5 2 1/4 x 4 2 1/4 x 4 2 3/4 x 5
Worm Gear Ratios Standard Ratio 5:1 5:1 5:1 5:1 5:1 5:1
Optional - - 20:1 - - 20:1
Turns of Work for 1" Raise Standard Ratio 20 40 25 20 40 25
Optional - - 100 - - 100
Maximum H.P. Per Actuator Standard Ratio 1/3 1/3 1/2 1/3 1/3 1/2
Optional - - 1/4 - - 1/4
Torque at Full Load (in-lbs) Standard Ratio 13 21 55 15 23 60
Optional - - 25 - - 27
Actuator Efficiency Rating (%) Standard Ratio 33 20 24.5 26.5 17.3 21.2
Optional - - 14.0 - - 11.8
Weight with Base Raise of 6" (lb) 2 1/4 2 1/4 5 2 1/2 2 1/2 6
Weight for Each Additional 1" Raise (lb) .10 .10 .27 .10 .10 .27
Rotating Parts Image

Rotating Parts List

* Used on 1/4 and 1/2 ton only.

** Used on 1 ton only.

Index Number Part Name Quantity
1 Screw, Set 2
2 Cap, Shell 1
3 Shell, Unit 1
4a Expansion Plug 1
5 Screw, Lifting 1
6 Worm Gear 1
7 Bearing, Top Load 1
8

Bearing, Bottom Load

1
9* Screw, Set 4
10* Bushing, Worm Retainer 2
11 Worm 1
12* Thrust Race 4
13* Bearing, Needle 2
14 Bushing, Guide 1
15 Fitting, Grease 1
16 Nameplate 1
17** Retainer Ring 2
18** Bearing, Worm 2
19 Screw, Drive 2
20 Lock Nut 1
21* Washer, Lock 1
22 Key 1
23  Lifting Nut 1

Translating Parts List

Translating Parts Image

* Used on 1/4 and 1/2 ton only.

** Used on 1 ton only.

Index Number Part Name Quantity
1 Screw, Set 2
2 Cap, Shell 1
3 Shell, Unit 1
4 Pipe, Bottom 1
5 Screw Assembly, Lifting 1
6a Worm Gear 1
6b

Backlash Nut Assembly

(Mfg'd and sold in sets only)

1
7 Bearing, Top Load 1
8 Bearing, Bottom Load 1
9* Screw, Set 4
10* Bushing, Worm Retainer 2
12* Thrust Race 4
13* Bearing, Needle 2
14

Bushing, Guide

(inverted models only)

1
15 Fitting, Grease 1
16 Nameplate 1
17** Retainer Ring 2
18** Bearing, Worm 2
19** Drive Lock Pin, Top Plate 1
cbb
090-EngineeringGuide.pdf

Engineering Guide

(approx. 1.0Mb)
500lb - 1 Ton MS Rotating.pdf

Rotating Machine Screwjack

(approx. 9.6Mb)
500lb - 1 Ton MS Translating.pdf

Translating Machine Screwjack

(approx. 1.5Mb)
QuarterTonMS.pdf

Quarter Ton Screwjack

(approx. 0.5Mb)
HalfTonMS.pdf

Half Ton Screwjack

(approx. 0.5Mb)
OneTonMS.pdf

One Ton Screwjack

(approx. 0.5Mb)

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