Home/
Lifting Equipment/
Screwjacks, Linear Actuators, Rotary Unions and ACME Ball Screws and Nuts/
Duff Norton Screwjacks/
Machine Screwjack Actuator, 1/4t to 1t

Machine Screwjack Actuator, 1/4t to 1t

Screwjack Actuator.

Model:

MSAT-4045

Machine Screw 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

Rotating Inverted Machine Screwjack Actuator

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

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
Standard Actuator Number	Inverted	DM2556	DM2626	DM2502
Special Actuator Number	Upright	UM3056	UM3626	UM3502
Special Actuator Number	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
Worm Gear Ratios	Optional	-	-	20:1
Turns of Worm for 1" Raise	Standard Ratio	20	40	25
Turns of Worm for 1" Raise	Optional	-	-	100
Maximum H.P Per Acutator	Standard Ratio	1/3	1/3	1/2
Maximum H.P Per Acutator	Optional	-	-	1/4
Torque at Full Load* (in-lbs)	Standard Ratio	13	21	55
Torque at Full Load* (in-lbs)	Optional	-	-	25
Jack Efficiency Rating (%)	Standard Ratio	33.0	20.0	24.5
Jack Efficiency Rating (%)	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
Worm Gear Ratios	Optional	-	-	20:1	-	-	20:1
Turns of Work for 1" Raise	Standard Ratio	20	40	25	20	40	25
Turns of Work for 1" Raise	Optional	-	-	100	-	-	100
Maximum H.P. Per Actuator	Standard Ratio	1/3	1/3	1/2	1/3	1/3	1/2
Maximum H.P. Per Actuator	Optional	-	-	1/4	-	-	1/4
Torque at Full Load (in-lbs)	Standard Ratio	13	21	55	15	23	60
Torque at Full Load (in-lbs)	Optional	-	-	25	-	-	27
Actuator Efficiency Rating (%)	Standard Ratio	33	20	24.5	26.5	17.3	21.2
Actuator Efficiency Rating (%)	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 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

* 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

Engineering Guide

(approx. 1.0Mb)

Rotating Machine Screwjack

(approx. 9.6Mb)

Translating Machine Screwjack

(approx. 1.5Mb)

Quarter Ton Screwjack

(approx. 0.5Mb)

Half Ton Screwjack

(approx. 0.5Mb)

One Ton Screwjack

(approx. 0.5Mb)

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)	Unit Price
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
More information about shopping on LiftingSafety Quotation Help Please choose the correct configuration of your desired product, then once complete - press on the 'Request Quote' button, this item will then be added to your basket (). To view your basket, simply click on the basket icon at the top of the page

Machine Screw 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

Rotating Inverted Machine Screwjack Actuator

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

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
Standard Actuator Number	Inverted	DM2556	DM2626	DM2502
Special Actuator Number	Upright	UM3056	UM3626	UM3502
Special Actuator Number	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
Worm Gear Ratios	Optional	-	-	20:1
Turns of Worm for 1" Raise	Standard Ratio	20	40	25
Turns of Worm for 1" Raise	Optional	-	-	100
Maximum H.P Per Acutator	Standard Ratio	1/3	1/3	1/2
Maximum H.P Per Acutator	Optional	-	-	1/4
Torque at Full Load* (in-lbs)	Standard Ratio	13	21	55
Torque at Full Load* (in-lbs)	Optional	-	-	25
Jack Efficiency Rating (%)	Standard Ratio	33.0	20.0	24.5
Jack Efficiency Rating (%)	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
Worm Gear Ratios	Optional	-	-	20:1	-	-	20:1
Turns of Work for 1" Raise	Standard Ratio	20	40	25	20	40	25
Turns of Work for 1" Raise	Optional	-	-	100	-	-	100
Maximum H.P. Per Actuator	Standard Ratio	1/3	1/3	1/2	1/3	1/3	1/2
Maximum H.P. Per Actuator	Optional	-	-	1/4	-	-	1/4
Torque at Full Load (in-lbs)	Standard Ratio	13	21	55	15	23	60
Torque at Full Load (in-lbs)	Optional	-	-	25	-	-	27
Actuator Efficiency Rating (%)	Standard Ratio	33	20	24.5	26.5	17.3	21.2
Actuator Efficiency Rating (%)	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 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

* 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

Engineering Guide

(approx. 1.0Mb)

Rotating Machine Screwjack

(approx. 9.6Mb)

Translating Machine Screwjack

(approx. 1.5Mb)

Quarter Ton Screwjack

(approx. 0.5Mb)

Half Ton Screwjack

(approx. 0.5Mb)

One Ton Screwjack

(approx. 0.5Mb)

Contact Us About This Product

If you wish to receive a quote for this product, please use the tab above, this form is for general enquiries regarding this product only.

Regarding: Machine Screwjack Actuator, 1/4t to 1t

Full Name:

Email Address:

Daytime Telephone:

Country:

Subject:

Message:

Attachment: - Optional
(jpg,gif,png,webp,pdf,doc,xls)

I agree to the Terms & Conditions and the Terms & Conditions of Export (if applicable). I agree to having my data stored in accordance with the Privacy Policy. I want to get exclusive email offers.

Did you know?

You can also Request a Quote using the Quote tab above!

You can easily add more than one item to the Quote Request. This is highly recommended as we will be able to suit your needs much more efficiently.

Share this page!

Save this QR code
for use on Smart Phones

Lifting Equipment

Height Safety Equipment

Machine Screwjack Actuator, 1/4t to 1t

Screwjack Actuator.

Machine Screw Jack

Rotating Inverted Machine Screwjack Actuator

Rotating Upright Machine Screwjack Actuator

Rotating Screwjack Specifications

Translating Screwjack Specifications

Rotating Parts List

Translating Parts List

More information about shopping on LiftingSafety

Quotation Help

Machine Screw Jack

Rotating Inverted Machine Screwjack Actuator

Rotating Upright Machine Screwjack Actuator

Rotating Screwjack Specifications

Translating Screwjack Specifications

Rotating Parts List

Translating Parts List

Products of Possible Interest

Contact Us About This Product

Share this page!