Stainless Steel Screw Jack | Columbus McKinnon

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.

Stainless Steel Actuator Cut-Away Diagram
	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

Stainless Steel Actuator Cut-Away Diagram

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

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Performance Specifications

Performance Specifications - Machine Screw Actuator Stainless Steel

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Stainless Steel Actuator Cut-Away Diagram

2 to 100 Ton Capacity

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