Acme Screw Jacks | Columbus McKinnon

Acme Screw Jack

Screw Jacks

1/4 to 350 ton capacity. Acme screw jacks offer positive mechanical action, precise positioning, and uniform lifting speeds. Standard configurations include upright or inverted units with translating or rotating lifting screws, and top plate, threaded, or clevis ends.
Duff-Norton offers a complete line of both standard and custom engineered machine screw actuators for applications up to 350 tons.

FEATURES & BENEFITS

Machine Screw Actuators 1/4 ton to 350 ton

Precise Positioning

Machine Screw Actuators can be controlled accurately for positioning within thousandths of one inch.

Self Locking

Models featuring higher gear ratios are inherently load holding as long as the actuator is not subject to vibration

Uniform Lifting Speeds

Since many actuators feature the same gear ratios different capacities can be used in the same application to lift unevenly distributed loads with uniform speeds.

Quick, Sure Operation

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

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
Key Torque (in-lb) - 17-4PH Worm	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
Key Torque (in-lb) - 316SS Worm	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.

Machine Screw Actuator Cut-Away Diagram
	Because the Duff-Norton machine screw mechanical actuator is produced in many standard models with a wide range of capacities, there is a standard model for almost any requirement. Models can be furnished to 350 Tons capacity. Operated manually or by means of gear motors, machine screw actuator models can be used singly, in tandem or in multiple arrangements. Since most capacities have a uniform lifting speed, added economy can be realized in raising unevenly distributed loads by operating the different capacities in union. Most Duff-Norton machine screw actuator models with higher ratios are self-locking and will hold heavy loads in position indefinitely without creep. They can be used to push, pull, apply pressure and as linear actuators. They are furnished with standard raises in increments of 1 inch. Depending upon size and type of load, models are available with raises up to 20 feet.

Machine Screw Actuator Cut-Away Diagram

Because the Duff-Norton machine screw mechanical actuator is produced in many standard models with a wide range of capacities, there is a standard model for almost any requirement. Models can be furnished to 350 Tons capacity.
Operated manually or by means of gear motors, machine screw actuator models can be used singly, in tandem or in multiple arrangements.
Since most capacities have a uniform lifting speed, added economy can be realized in raising unevenly distributed loads by operating the different capacities in union.
Most Duff-Norton machine screw actuator models with higher ratios are self-locking and will hold heavy loads in position indefinitely without creep.
They can be used to push, pull, apply pressure and as linear actuators. They are furnished with standard raises in increments of 1 inch.
Depending upon size and type of load, models are available with raises up to 20 feet.

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Acme Screw Jack

Screw Jacks

Features and Benefits

Precise Positioning

Self Locking

Uniform Lifting Speeds

Quick, Sure Operation

Performance Specifications

Performance Specifications - Machine Screw Actuator Stainless Steel

Options

Machine Screw Actuator Cut-Away Diagram

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