SJA20 Screw jack

Keywords:

SJA20 Screw jack

Category:

SJA Acme Screw Jack

Asia, America,

Africa , Australia

Europe, America,
Africa, Oceania

Phone

Wechat

L13311099286

0086-13691276470

export@lim-tec.com

vera.zha@lim-tec.com

Screw Jack and Linear Actuator 2026.pdf
SJASJB_lxsjj.zip

3D Model Download

Consultation

Description

SJA Acme Screw Screw Jack

High precision movement,steady movement, low noise, high speed

Advanced Structural Design for Enhanced Performance
Lim-Tec screw jacks feature a unique square-groove housing design, which significantly improves heat dissipation capacity, reduces operating temperature, and extends grease service life. The use of high-strength ductile iron housing enhances mechanical strength, durability, and reliability, making the screw jack suitable for demanding applications in both high-temperature and low-temperature environments.

Precision Control and Superior Reliability
The innovative square tail cover design effectively prevents lead screw rotation during operation, ensuring stable and accurate linear movement. Advanced CNC machining equipment, strict quality control, and optimized assembly processes guarantee consistent performance and long service life.

Modular Design for Unlimited Configuration Options
Lim-Tec screw jacks offer flexible configuration possibilities to meet diverse application requirements. It can be directly integrated with motors, gear motors and other drive systems, providing customers with thousands of customized combinations. For detailed technical specifications, please contact Lim-Tec.

Customized Solutions Available
Lim-Tec provides tailor-made solutions including:
Stainless steel housing and components; Stainless steel screw jack solutions for corrosive environments; Extended stroke / long screw designs; High and low temperature resistant solutions;
Customized mounting and drive configurations

Complete Accessories and Optional Features
To meet different industrial requirements, Lim-Tec screw jacks can be equipped with a comprehensive range of accessories and options, including:
Protective bellows / dust covers; Special thread designs; Safety nuts;Ball screws; Limit switches; Safety clutches;Overload protection clutches; Potentiometers; Encoders; Brakes; Hand wheels; Mounting accessories,etc.

Performance Table

Size		SJA5	SJA10	SJA20	SJA50	SJA80	SJA100
Max lifting load kN		5	10	20	50	80	100
Screw dia x pitch mm		Tr18×4	Tr20×4	Tr30×6	Tr40×7	Tr50×8	Tr60×9
Worm ratio	V1	1:4(1:3.75)*	1:4(1:3.75)*	1:6(1:5.75)*	1:7(1:6.75)*	1:8(1:7.75)*	1:8(1:7.75)*
Worm ratio	L1	1:16	1:16	1:24	1:28	1:32	1:32
Stroke for one input turn mm	V1	1	1	1	1	1	1.125
Stroke for one input turn mm	L1	0.25	0.25	0.25	0.25	0.25	0.281
Max input power kW	V1	0.30	0.57	1.14	2.2	2.5	3
Max input power kW	L1	0.15	0.27	0.55	1.1	1.5	2.2
Max starting torque at full load Nm	V1	4.2	8	18	48.5	75	100
Max starting torque at full load Nm	L1	1.5	3.1	6.7	20	30	41
Sarting efficiency	V1	0.24	0.25	0.19	0.18	0.17	0.18
Sarting efficiency	L1	0.16	0.16	0.12	0.11	0.10	0.11
Running efficiency at 1500rpm	V1	0.34	0.35	0.33	0.32	0.31	0.33
Running efficiency at 1500rpm	L1	0.25	0.25	0.24	0.23	0.22	0.23
Torque without load Nm	V1	0.11	0.29	0.40	0.84	1.85	2.1
Torque without load Nm	L1	0.09	0.18	0.29	0.59	1.12	1.4
Housing material		Spheroidal graphite iron
Weight kg		3.2	5	8.5	21.5	36	58
Weight per 100mm screw &protective tube kg		0.36	0.50	0.75	1.52	2.44	3.02

Note:Working temperature of SJ screw jack is -10℃ - +40℃(-40℃ - +70℃ are available).

Acme lead screw with double or three head are available to increase the lifting speed, please consult Lim-Tec engineer for the specifics.*Indicates the actual reduction ratio

Selection Table Guide

n1=input speed Nm=input torque required kW=input power required

SJA20			Lifting Load
SJA20			20kN				15kN				10kN				5kN
n1	Lifting speed mm/s		Ratio				Ratio				Ratio				Ratio
n1	Lifting speed mm/s		V1		L1		V1		L1		V1		L1		V1		L1
RPM	V1	L1	Nm	kW	Nm	kW	Nm	kW	Nm	kW	Nm	kW	Nm	kW	Nm	kW	Nm	kW
1400	23.3	5.8	9.65	1.41	3.32	0.49	7.23	1.06	2.49	0.36	4.82	0.707	1.658	0.243	2.412	0.354	0.829	0.122
900	15.0	3.7	10.27	0.97	3.62	0.34	7.70	0.73	2.71	0.26	5.13	0.484	1.809	0.170	2.567	0.242	0.904	0.085
700	11.7	2.9	10.61	0.78	3.98	0.29	7.96	0.58	2.98	0.22	5.31	0.389	1.990	0.146	2.653	0.194	0.995	0.073
500	8.3	2.1	11.37	0.60	4.19	0.22	8.53	0.45	3.14	0.16	5.68	0.298	2.094	0.110	2.842	0.149	1.047	0.055
300	5.0	1.2	11.79	0.37	4.42	0.14	8.84	0.28	3.32	0.10	5.90	0.185	2.211	0.069	2.948	0.093	1.105	0.035
100	1.7	0.4	12.73	0.13	4.97	0.05	9.55	0.10	3.73	0.04	6.37	0.067	2.487	0.026	3.183	0.033	1.243	0.013
50	0.8	0.2	12.73	0.07	6.63	0.03	9.55	0.05	4.97	0.03	6.37	0.033	3.316	0.017	3.183	0.017	1.658	0.009

Note:The green area in the table indicates that the selected model has exceeded the maximum allowable input power of that model. If selected, reduce working duty

cycle,consult Lim-Tec engineers.