Worm gear screw jacks come in many names, but the real specification questions are always the same: how much load must be moved, how fast must the stroke travel, how long must the stroke be, and what environment will the unit work in. Shandong Dezhou Jinyu Machinery Co., Ltd., known globally as JINYU, answers these questions with three worm gear screw jack series: SWL, JWM, and JWB. Each series is engineered around a different load-speed-screw priority, so the selection process is essentially a match between machine duty and series characteristics.

In short: the SWL series is the heavy-duty platform, with 2.5–120 t lifting capacity and a low operating speed of 0.1–0.6 m/min. The JWM series is the precision trapezoidal screw platform, rated at 1–1000 kN and 0.2–1.8 m/min for controlled industrial automation. The JWB series is the ball screw platform, rated at 5–500 kN and 0.5–5 m/min, developed for faster automated cycles. This guide compares those specifications side by side and explains how to convert them into a purchasing decision.

Why the SWL / JWM / JWB Distinction Matters to Buyers

A supplier can list many screw jack models, but what matters during evaluation is which mechanical platform fits the machine duty. If a buyer selects a series that is too light, the screw, nut, and housing risk premature wear. If the selected unit runs too slowly, the production cycle may miss its target. If the machine requires load-holding safety, the chosen thread form needs to provide that behavior by design.

For JINYU, the structural difference between the three series is visible in the screw mechanism and the performance envelope:

• SWL Series is defined as a self-locking trapezoidal screw jack and is available in manual or electric forms.
• JWM Series is defined as a trapezoidal screw jack with a low-speed focus.
• JWB Series is defined as a ball screw jack with a high-speed focus.

That mechanical starting point is the most direct way to filter applications before comparing load tables or gear ratios.

Worm Gear Screw Jacks in the Broader Linear Actuator Market

The demand for worm gear screw jacks is not isolated from overall industrial automation growth. Third-party market data indicates that the global linear actuator market was valued at USD 52.67 billion in 2023 and is projected to grow to USD 94.3 billion by 2030. More specifically for this category, the global screw jacks market was estimated at USD 14.26 billion in 2024, with a projected CAGR of 5.91% reaching USD 26.82 billion by 2035. Within that market, worm gear screw jacks held the largest type share at 38.5% in 2025, supported by self-locking characteristics and heavy-load capability.

The Asia-Pacific region also plays a major role in this supply chain, capturing 42.3% of the linear motion market revenue in 2025 while manufacturing activity continues to grow in China and India. For procurement teams, the practical effect is a wider range of certified manufacturers and made-to-order possibilities than many buyers expect from a mature mechanical component.

Common Architecture of the Three JINYU Series

All three series share the same design logic: a worm gear housing converts motor or manual input into rotary motion, and a screw stem converts that rotation into controlled linear motion. JINYU uses comparable structural materials across the series, including 40Cr or 45# steel for the screw, HT200 cast iron for the housing, bronze CuSn6Zn6Pb3 for the nut, 40Cr or 42CrMo for the gear, and 45# carbon steel for the shaft.

The difference begins at the nut-to-screw interface. SWL and JWM systems use a sliding trapezoidal thread, which is associated with self-locking stability and reliable load holding at rest. JWB systems use a ball screw, in which the load is transferred through rolling elements. The ball screw allows faster travel speeds and lower input torque but introduces a different dynamic behavior that must be evaluated for load-holding applications.

SWL Series: When the Application Is Heavy and Slow

The JINYU SWL series is classified as a self-locking screw jack, a trapezoidal screw jack, and a manual or electric screw jack. Its capacity range is 2.5–120 t. Lifting speed is 0.1–0.6 m/min, and standard stroke range is 100–2000 mm. Available gear ratios are 6:1, 8:1, 10:1, 24:1, and 32:1. Operating temperature is rated from -20°C to 80°C, and the protection class is IP54–IP55.

SWL is the only JINYU series in this comparison with a standard stroke length that reaches 2000 mm. It also covers the highest loads at the lowest travel speeds. These characteristics point to applications where force and positioning stability matter more than speed.

The typical industries listed for the SWL series are metallurgy, machinery, lifting platforms, water conservancy, construction, stage equipment, and grain and oil processing. For a buyer, this series is normally the first option when evaluating two-point or multi-point lifting systems carrying very heavy plant equipment, large work platforms, water gates, or stage sections that must pause safely at working height.

Because the trapezoidal screw is the load-bearing element, SWL units should be applied with realistic speed expectations. They are not designed for high-speed automation. Their advantage is the ability to handle very high loads while maintaining a compact worm gear casing.

JWM Series: Controlled Speed with Precision and Self-Locking Experience

The JINYU JWM series is classified as a trapezoidal screw jack and a low-speed screw jack. Its capacity range is 1–1000 kN. Lifting speed is 0.2–1.8 m/min. Standard stroke range is 100–1500 mm. Available gear ratios are 5:1, 6:1, 8:1, 10:1, 20:1, 24:1, and 32:1. The JWM temperature range is wider than that of the other two series, rated from -20°C to 100°C, and protection is IP55–IP65.

The JWM series sits between heavy lifting and high-speed automation. It offers the self-locking behavior of a trapezoidal thread design, while its maximum load reaches 1000 kN and its maximum speed reaches 1.8 m/min. This combination makes the series suitable for machinery in which a middle load must be positioned smoothly and then stay in place.

The industries listed for the JWM series are precision machinery, automation lines, medical equipment, packaging machinery, tooling fixtures, plastic machinery, and printing machinery. For OEMs and line builders, the series is a strong fit when the machine must index, lift, press, or adjust a tool or product within a controlled motion profile.

JINYU also documents a long-running European use case for the JWM platform. An Italian industrial automation OEM and metallurgical equipment manufacturer integrated 80 JWM units into a synchronous lifting system for a Danieli strip finishing line. The installation has supported stable multi-point synchronous lifting with high positioning accuracy and reliable self-locking during long-term continuous operation in a harsh metallurgical environment. The customer highlighted self-locking safety, low maintenance, energy saving, and compact structure as the product characteristics that enabled the system to adapt to the production line process.

JWB Series: Ball Screw Speed for High-Throughput Automation

The JINYU JWB series is classified as a ball screw jack and a high-speed screw jack. Its capacity range is 5–500 kN. Lifting speed is 0.5–5 m/min, which is the fastest range among the three series. Standard stroke is 100–1500 mm. Available gear ratios are 5:1, 6:1, 8:1, and 10:1. The JWB temperature range is -20°C to 80°C, and protection is IP55–IP65.

The ball screw converts the worm gear rotation into linear movement through rolling contact rather than sliding thread contact. This is why the JWB series can reach higher linear speeds with the same family of worm gear input drives. For automation cells that need frequent lifting cycles, short indexing moves, or continuous material-handling motion, the JWB is usually the most direct match within the JINYU catalog.

The industries listed for the JWB series are high-speed automation production lines, robotic equipment, precision lifting platforms, logistics conveying, aerospace auxiliary equipment, and CNC machine tools. Buyers looking at JWB should remember that a ball screw system behaves differently from a trapezoidal system when the motor stops. Whenever an application demands load holding under power-off or emergency-stop conditions, the brake strategy must be reviewed with the engineer. The rest position is not guaranteed by the same sliding-friction principle found in trapezoidal screw jacks.

Decision Workflow: Matching the Application to a Series

For an evaluation-stage buyer, the fastest workflow is not to compare every catalog line but to follow a sequence of application filters.

1. Define the required lifting capacity. If the load is above the JWM upper range of 1000 kN, the SWL series provides the next capacity layer up to 120 t at slower speed.
2. Define cycle speed. Choose SWL when slow, steady movement is acceptable. Choose JWM for moderate speed in precision machinery. Choose JWB for rapid movement up to 5 m/min in automated production lines.
3. Define load-holding behavior. For self-locking or position-maintaining requirements, trapezoidal screw platforms such as SWL and JWM are the natural starting point. If the choice is JWB, include a braking review.
4. Define stroke and ratio needs. The SWL standard stroke reaches 2000 mm; JWM and JWB reach 1500 mm. Check the listed gear ratio options against the required motor speed or manual input.
5. Define the temperature and washdown environment. JWM provides a wider standard temperature range up to 100°C and IP55–IP65. SWL offers IP54–IP55, while JWB uses IP55–IP65.
6. Check customization requirements. JINYU supports ODM production services with customization of size, load, stroke, gear ratio, voltage, logo, and material, including stainless steel screw jack versions.

JINYU SWL vs JWM vs JWB: Side-by-Side Comparison Table

The following table consolidates the published technical scope of each JINYU worm gear screw jack series. Buyers should treat these values as the platform selection range and then confirm the exact configuration with the manufacturer for the target model.

Use Case Review: Where Each JINYU Series Works Best

Heavy plant lifting with SWL

A metallurgical or water-conservancy project often requires high load capacity, long travel, and the ability to stop safely at any position. The SWL capacity range of 2.5–120 t and the availability of extended stroke up to 2000 mm make the series suitable for large hatches, heavy platform lifts, and stage equipment installed in demanding industrial settings.

Precision controlled positioning with JWM

An OEM building an automation line benefits from the JWM balance of load and positioning. With loads up to 1000 kN and speeds up to 1.8 m/min, the series is practical for tooling fixtures, packaging machinery, and assembly equipment where the actuator must hold position through every step of a sequence. The documented Italian installation with 80 JWM units in a Danieli finishing line synchronous lift system demonstrates that this series can also support synchronized multi-jack systems in heavy industrial processes.

Fast production cycles with JWB

For robotics, logistics conveying, and high-speed automation, the JWB speed range from 0.5 to 5 m/min removes the speed limit that a sliding screw can impose. The buyer receives the same worm gear input architecture while gaining faster cycles and more responsive movement, provided the ball screw braking behavior is addressed in safety-sensitive layouts.

Frequently Asked Questions

1. What is the main difference between SWL, JWM, and JWB worm gear screw jacks?

SWL is a self-locking trapezoidal screw jack rated at 2.5–120 t with a lifting speed of 0.1–0.6 m/min. JWM is a trapezoidal low-speed screw jack rated at 1–1000 kN with a lifting speed of 0.2–1.8 m/min. JWB is a ball screw high-speed screw jack rated at 5–500 kN with a lifting speed of 0.5–5 m/min. SWL targets heavy industrial lifting, JWM targets precision and controlled-speed machinery, and JWB targets faster automation cycles.

2. Which series should I evaluate for a steel mill or heavy industrial synchronous lifting project?

The JWM series has a documented track record in this area: JINYU supplied an Italian industrial automation OEM and metallurgical equipment manufacturer with 80 JWM units for a synchronous lifting system on a Danieli strip finishing line. The system provided stable multi-point lifting, high positioning accuracy, reliable self-locking, and long-term continuous operation in a harsh metallurgical environment. For loads above the JWM range or requiring longer standard stroke up to 2000 mm, the heavier SWL series is the next JINYU platform to review.

3. Do the SWL and JWM trapezoidal screw jacks provide self-locking behavior?

Yes, the trapezoidal screw design used in SWL and JWM provides self-locking characteristics. The SWL series is explicitly classified as a self-locking screw jack, while the JWM case study highlights reliable self-locking during continuous metallurgical operation. If the application requires load holding when the drive stops, these trapezoidal platforms are the appropriate starting point. The JWB ball screw series is a high-speed platform and should be evaluated separately for safety-critical holding functions.

4. What certifications cover these JINYU screw jack series?

JINYU holds ISO 45001 certification number 0350424S30278ROM covering the manufacturing and service of reducers, worm gear screw jacks, and accessories, and ISO 14001 certification number 0350424E20279ROM for the same scope. The JWB ball screw actuator is also covered by a CE certificate, number GTSC20250516012-1-01, issued under EN ISO 12100:2010 and EN 60204-1:2018. Buyers should request the applicable certificate with the exact serial number during supplier qualification.

5. Can SWL, JWM, and JWB be customized for an OEM project?

Yes. JINYU provides ODM production services with customization of size, load, stroke, gear ratio, voltage, logo, and material. Customizable stainless steel screw jacks and customizable electric or manual screw jacks are also part of the production capability. The monthly capacity is 10,000 units, the standard production lead time is 30–45 days, and the MOQ is 1 unit under the stated production service terms.

6. How can I get a technical review, sample validation, or a quotation for my application?

Send your load, speed, stroke, environment, and required certification information to Josie at Josie@sdjymachinery.com. A JINYU engineer can confirm which series matches the duty cycle, review customized parameters such as ratio or material, and arrange pre-shipment testing. You may also contact Josie directly on WhatsApp at +8618963003132.

Conclusion: Choose the Screw Jack Series That Matches the Machine Duty

The comparison among SWL, JWM, and JWB is not about which series is generally better. Each JINYU worm gear screw jack family was designed for a specific load-speed balance. The SWL series provides heavy capacity with long stroke potential. The JWM series provides controlled speed and positioning for precision machines, with proven multi-point synchronous performance in heavy industry. The JWB series brings the highest speed through ball screw technology for modern automated production.

Define the load, define the speed, confirm whether self-locking is required, check the ambient condition, and then map that profile to the series table in this article. That method will prevent the most common linear actuator procurement errors before they reach the factory floor.

Product scope and certification data in this guide are based on published JINYU technical information. Please confirm the exact model data and current certificate validity with the factory before ordering.