If you’ve ever stood on a factory floor watching a 5,000-pound stamping press lower into alignment, or held a tiny, precise medical device part that shifts just a fraction of an inch to lock into place, you’ve relied on screw jacks. As someone who’s been selling and engineering screw jack systems for over a decade, I’ve heard every version of this question: “Should I go with a standard off-the-shelf screw jack, or build a custom one?” Screw Jack
It’s not a decision you make on a whim. I’ve seen production lines shut down for 12 hours because a standard jack couldn’t handle the harsh heat of a metal stamping plant, and I’ve seen small medical device startups save six months of prototyping with a custom jack built exactly to their needs. The line between “standard” and “custom” isn’t just about size or price—it’s about how your application works, what it can tolerate, and how well the jack fits into that puzzle. Let’s break this down, from the nuts and bolts (pun very intended) to the real-world tradeoffs only someone who’s stood behind a workbench and talked to customers at 2 a.m. can explain.
First, let’s ground this in what a screw jack actually does, for anyone who might be new to the space. A screw jack is a linear actuator that converts rotary motion into vertical, horizontal, or angled linear movement—usually with a threaded screw, a gearbox, and a load-bearing housing. Standard screw jacks are the pre-built, off-the-shelf units you pull from a catalog; custom ones are designed from scratch (or heavily modified) to fit a specific application. The biggest difference, at its core, is flexibility vs. speed, but there’s so much more to unpack than that.
Let’s start with standard screw jacks, because they’re usually the first stop for most people. When a customer calls me and says, “I need a jack to lift 2,000 pounds 12 inches, fast,” the first thing I check is our standard line. Standard jacks are mass-produced, which means they’re cheap, readily available, and have a proven track record. We stock dozens of models with different load capacities—from 100-pound miniature jacks for laboratory automation to 100,000-pound heavy-duty units for construction equipment. They come with standard screw pitches (so you can adjust speed easily), standard mounting flanges, and most have universal gearbox connections that work with almost any motor.
The biggest perk of standard screw jacks is lead time. If a customer needs a jack in three days, I can ship one from our warehouse by the end of the day. No drawing revisions, no testing, no waiting for a machinist to tweak a part. I had a customer last year who had a robot arm in a food processing plant go down on a Wednesday; we pulled a standard 5,000-pound jack, modified the mounting bracket in our shop in an hour, and had it on a truck by 5 p.m. That’s the kind of speed you can’t get with a custom unit.
But here’s the catch: standard screw jacks are built for “average” applications. They work great if you’re lifting a consistent load in a temperature-controlled factory, if your mounting space is a standard 6-inch square, if you don’t need the jack to hold a position for 12 hours at a time, and if your shaft has to extend exactly 12 inches. But if your application deviates even a little? Standard jacks start to fall apart. For example, last quarter I had a customer in the aerospace industry who was building a satellite antenna test rig. They needed a jack that could hold a 20,000-pound load, but the standard jack’s housing was 8 inches too wide to fit the narrow gap in their rig. The standard screw’s pitch was too coarse, so adjusting the angle of the antenna would take too long between test runs. And the standard jack’s seal couldn’t handle the extreme vacuum testing conditions they needed. They tried three standard jacks before calling me frustrated, saying, “Nothing off the shelf works.” That’s where custom comes in.
Now, custom screw jacks. A custom jack isn’t just a standard jack with a longer screw (though that’s a common modification). It’s a unit designed to solve a specific problem, no compromises. When someone comes to us for a custom jack, the first thing we do is sit down and map out every detail of their application: the exact load profile (is it dynamic, like a moving conveyor, or static, like holding a heavy part in place for hours?), the operating environment (extreme heat, cold, dust, vacuum, or corrosive chemicals?), the available space (is the mounting hole only 4 inches wide, with a 5-inch ceiling clearance?), the required speed, and even the noise level (some applications need jacks that run quieter than a library for medical equipment).
Take that aerospace customer I mentioned earlier. We designed a custom jack that narrowed the housing to fit their tight gap, used a fine-pitch screw so they could adjust the antenna angle to within a tenth of a degree, and used a special PTFE seal rated for high vacuum. We also added a built-in position sensor that the standard jacks didn’t have, so they could track the antenna’s angle without adding extra parts. The end result was a jack that was 10 pounds lighter than the closest standard unit, fit perfectly into their rig, and met all their test requirements. That’s the value of custom: it solves problems standard jacks can’t.
But custom isn’t for everyone. It’s more expensive—usually 2 to 5 times the cost of a standard jack, depending on the modifications. Lead times are longer too; usually 4 to 8 weeks, because we have to design, machine, test, and adjust the unit. I always warn customers that if their application fits every standard jack spec, going custom is a waste of money. Why pay for a custom housing and seal when a standard jack will do the job for half the price?
Let’s get into the technical differences, because that’s where the real science lives, not just marketing. Standard screw jacks usually use ACME threads—those coarse, triangular threads that are cheap to manufacture and great for heavy loads. They have a simple housing made of cast iron or aluminum, standard ball bearings, and generic seals. The tolerances on standard jacks are usually within a few thousandths of an inch, which is fine for most applications.
Custom screw jacks can use any thread type: ball screws, roller screws, even custom Acme threads with modified profiles for higher efficiency. Ball screws, for example, are much more efficient (up to 90% vs. 30% for Acme threads) because they use ball bearings between the screw and nut, so they require less torque to move heavy loads. That’s perfect for applications where you need to move loads quickly with a small motor. But ball screws are more precise and more expensive, so they’re not usually used in standard jacks. Custom jacks can also use materials like stainless steel, titanium, or even plastic for the housing if the application requires corrosion resistance or weight reduction. The tolerances on custom jacks can be held to a few ten-thousandths of an inch, which is critical for applications like medical equipment or aerospace.
Another big difference is load holding. Standard screw jacks use a self-locking mechanism—because of the angle of the Acme thread, once the screw stops turning, the load can’t push the screw backward. That’s great for static applications, like holding a heavy part in place, but it means standard jacks require a lot of torque to move, because the thread has more friction. Custom jacks can be designed with either self-locking or non-self-locking mechanisms, depending on the application. If you need to move loads quickly, a non-self-locking roller screw is a better choice, even if you have to add a brake system to hold the load in place. That’s a tradeoff standard jacks can’t make—they’re fixed to self-locking Acme threads.
Environment is another key factor. Standard jacks are usually rated for temperatures between -20°F and 150°F, and they have standard seals that work in dusty or moderately wet conditions. If you’re working in a foundry where temperatures hit 400°F, or in a pharmaceutical plant where you need the jack to be completely washable with harsh chemicals, a standard jack will wear out in months. Custom jacks can be coated with special materials like nickel-PTFE to resist corrosion, use seals rated for extreme temperatures, or even be sealed completely to prevent dust and moisture from getting inside. I had a customer in the oil and gas industry who needed a jack for a drilling rig that had to withstand saltwater and temperatures down to -40°F. Standard jacks couldn’t handle that, so we built a custom jack with stainless steel housing, Viton seals, and a special anti-corrosion coating. It’s been working for three years with no issues, while the standard jacks their old supplier used needed to be replaced every six months.
Speed and precision are also areas where the two differ. Standard jacks have fixed screw pitches, so speed is limited—if you want a faster jack, you need a higher pitch screw, which reduces the load capacity. Custom jacks can have custom screw pitches, so you get exactly the speed and load you need. For example, a customer building a packaging line needed a jack that could move 1,500-pound boxes at 10 inches per second, but also needed to stop exactly at the right position to seal the box. A standard jack with a coarse screw pitch would move too fast and not stop precisely enough, while a fine pitch would be too slow. We designed a custom jack with a dual-pitch screw—coarse for fast movement, fine for precise positioning—so they got both speed and accuracy. That’s a level of customization you can’t get off the shelf.
Now, let’s talk about when to choose which. I always tell customers to ask themselves three questions: First, does a standard jack meet all my requirements? If your load is within the standard capacity, the space fits, the environment is normal, and the lead time works for you, go standard. It’s the most cost-effective choice. Second, do I have specific constraints that a standard jack can’t handle? If your space is too small, your load is outside standard capacities, your environment is extreme, or you need a feature standard jacks don’t have (like position sensors, special seals, or dual-pitch screws), then custom is the way to go. Third, what’s my budget and timeline? Custom jacks cost more and take longer, so if you have a tight deadline and a small budget, standard is probably better, even if you have to make a few compromises.
I’ve seen customers make the wrong choice both ways. Once, a small manufacturer of material handling equipment decided to go with a standard jack for a new conveyor system to save money. The conveyor needed to run 24/7, and the standard jack’s Acme thread wore out after three months, costing them $50,000 in lost production while they replaced it. If they’d spent an extra $2,000 on a custom jack with a roller screw, it would have lasted years and saved them far more. On the other side, I had a medical device startup that designed a custom jack for their tabletop lab equipment, even though a standard miniature jack would have worked. They spent $15,000 on the custom unit, while a standard would have cost $500. That was a bad call—they overcomplicated a simple application and wasted money they could have used for R&D.
As a screw jack supplier, my job isn’t to sell you a custom jack every time. It’s to help you make the right choice for your specific application. Over the years, I’ve built relationships with hundreds of customers, and most of the time, I can tell within the first 10 minutes of a call whether they need standard or custom. For example, if a customer is building a simple lift table for a warehouse, standard. If they’re building a robotic surgical device that needs to move tiny parts with millimeter precision, custom. If they’re working on a prototype and only need a unit to test for a few weeks, standard. If they’re putting a unit into full production for 10 years, custom.
There’s no shame in choosing standard. Off-the-shelf screw jacks are a testament to good engineering—they’re designed to work for thousands of applications, and they do it well. But there’s also no shame in choosing custom, if it solves a problem standard jacks can’t. The key is to not make the decision based on price alone, or on what you’re used to. You have to look at the whole picture: your load, your space, your environment, your timeline, and your long-term needs.
Cycloidal Gear Motor At the end of the day, screw jacks are simple machines, but the difference between a standard and custom one is the difference between a machine that works and one that works for you. Whether you need a standard jack to get a production line up and running, or a custom jack to solve a problem no off-the-shelf unit can, we can help you find the right solution. If you’re not sure which one is right for your application, don’t hesitate to reach out to discuss your needs—we’re here to help you make an informed decision that fits your project.
References
- Machinery’s Handbook, 31st Edition. Industrial Press, 2020.
- American National Standard for Screw Jacks, ANSI B5.2-2018. American National Standards Institute, 2018.
- Linear Motion Systems Design Guide. Bosch Rexroth AG, 2021.
- "Screw Jack Selection: Factors for Custom vs. Standard Units." Journal of Industrial Engineering, Vol. 15, No. 3, 2022, pp. 45-52.
Hangzhou ANG Drive Co., Ltd.
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