If you’ve ever sourced sheet metal parts for industrial machinery, agricultural equipment, or commercial vehicles, you know that even a small design tweak can flip a maintenance job from a 10-minute fix to a multi-hour, costly headache. For our team, a sheet metal parts supplier that’s worked with OEMs and maintenance teams across North America for 12 years, this isn’t just theory—it’s the daily reality we see on the shop floor and service bays. Last year, a farming client of ours came to us frustrated: their existing combine harvester’s access panel, made with a complex bent tab and hidden fastener, cost their service techs 45 minutes to remove every time they needed to clear crop debris. By redesigning that panel to use exposed, oversized screws and standard, off-the-shelf gaskets, we cut maintenance time for that task by 80% and saved them an estimated $12,000 in yearly service labor. That’s the kind of value we’re here to deliver, and today I’m breaking down how you can design sheet metal parts for low-cost maintenance, with lessons learned from years of working with teams that have to keep equipment running, not just build it. Sheet Metal Parts
First, let’s start with the single biggest mistake we see in design: overcomplicating access. When a mechanical engineer designs a part that’s meant to be serviced, their focus is often on strength and fit for production, not the person who will have to reach it with a wrench or screwdriver a year later. Take access fasteners, for example. Too often, we get designs with “hidden” tabs or internal screws that require specialty tools to remove. A few years back, a construction equipment OEM sent us a cab floor support bracket that had four screws recessed ¼ inch into a narrow channel between two welded flanges. Our shop foreman, Joe, tested removing one of those screws with a standard wrench and couldn’t get enough leverage to turn it. We had to suggest a simple change: move the fasteners to the outer edge of the bracket, add a ⅛ inch gap between the bracket and adjacent part to accommodate a standard socket, and use Phillips-head screws instead of the tamper-proof Torx design they’d chosen. The OEM pushed back at first—tamper-proof screws felt like a security feature for their equipment. But when we showed them a photo of a service tech cursing while trying to remove that bracket in the rain at a job site, they changed their minds. Now, that bracket’s fasteners are one of the easiest maintenance points on their line, and their service manuals even call out the change to other fleets of their equipment. The lesson here: design for the last person to touch the part, not the first. If a service tech needs to remove a part in tight quarters, every ½ inch of extra space or every standard tool they can use cuts time—and money. For reference, the Bureau of Labor Statistics reports that the average hourly wage for industrial maintenance technicians is $28.50 as of 2024, so every minute saved on a service task adds up quickly. A 30-minute job that turns into two hours is a $100 difference, and for a fleet of 100 machines, that’s $10,000 a month. Over a year, that’s six figures. It’s not just fasteners, either. Access openings for filters, sensors, or wiring should be sized for a human hand wearing work gloves—not just a part that fits on a CAD screen. We recently redesigned a control box housing for a food processing client; originally, the access door was a 6×6 inch square, just big enough for a hand without gloves. After talking to their service team, we enlarged it to 8×10 inches, added a recessed grip on the door’s frame, and simplified the hinge design so the door swings fully open instead of stopping at 90 degrees. Their techs now change the internal filter in 12 minutes instead of 40, and they’ve told us that small change has cut their monthly service calls for that equipment by 15%.
Next, standardization is non-negotiable for low-cost maintenance. One of the biggest hidden costs in sheet metal maintenance is custom parts. If a part breaks and you have to wait for a custom bend or a special fastener to be machined, that’s downtime that’s way more expensive than the part itself. For example, we had a client in the waste management industry who was using custom-shaped sheet metal guards for their truck loaders. Each guard required a unique bolt pattern and a special gasket that only the original equipment manufacturer (OEM) made. When one guard broke, they had to order it from the OEM, which took three weeks and cost $450. In that time, their truck was out of service, costing them about $2,000 a day in missed pickups. We worked with them to redesign those guards to use standard ¼-20 bolts, off-the-shelf rubber gaskets, and a bend pattern that fits common aluminum sheet stock instead of custom-cut steel. Now, if a guard breaks, they can pick up a replacement from a local industrial supply store in 24 hours for $80. That’s a 82% reduction in part cost and a 90% reduction in lead time. How do you standardize without sacrificing functionality? Start with fasteners: use standard thread sizes (¼-20, M6) instead of custom ones, avoid specialty finishes unless absolutely necessary, and stick to bend radii that are common for your sheet metal supplier (ours is ⅛ inch for 16-gauge steel, for example). Gaskets and seals are another area where standardization works. We see a lot of designs that specify custom-cut gaskets, which have to be ordered separately, cost more, and can have fit issues. By using a standard sheet of rubber and a simple cut pattern (circle, square, or rectangle), you can have gaskets cut locally or even by the maintenance team themselves with a utility knife. One of our aerospace clients even started keeping a stock of standard gaskets on their shop floor after we redesigned their access panels, eliminating the need to order gaskets for every maintenance run. Another tip for standardization: avoid part number proliferation. If you have 10 different machines that use a similar bracket, design one bracket that works for all of them with a simple spacer or adapter plate. We did this for a farm equipment client who had 20 different tractor models with similar exhaust guards. Instead of 20 unique guards, we designed one base guard and 5 adapter plates. Their service team now keeps one guard in stock instead of 20, and they can swap adapters in 5 minutes instead of waiting for a custom part. That’s another layer of cost savings: inventory holding costs, which can eat up 20-30% of a part’s cost annually for custom or low-volume items.
Then, think about repairability, not just replacement. Too often, designers treat sheet metal parts as disposable—if they get dented or scratched, you throw the whole part away and order a new one. But a dented guard or a bent bracket can often be fixed with basic tools, saving thousands in replacement costs. When we design parts, we build in repairability by prioritizing materials that are easy to work with, avoiding brittle finishes, and adding features that make small fixes possible. For example, we use 14- to 16-gauge steel for most structural sheet metal parts, instead of thinner 18-gauge, because it’s strong enough for equipment but still flexible enough to bend back into shape if it gets dented. We also avoid powder coatings that crack easily when bent—instead, we use durable, flexible powder coatings that can withstand minor repairs without chipping or peeling. Another repairability trick: add bendable tabs or flanges instead of solid welds for parts that are likely to get damaged. We worked with a construction equipment client who had a cab corner panel that was welded to the frame. Every time a tree branch hit it, the weld broke, and they had to replace the entire panel. We redesigned it with two bendable tabs that bolt to the frame, instead of welds. If a branch dents the panel, a service tech can bend the tabs slightly, tighten the bolts, and fix it in 10 minutes instead of replacing the whole panel. We tested this with a prototype, and it withstood three times the impact of the original weld design without failing. That’s the kind of design that keeps equipment running, not just keeps parts on the shelf. We also recommend adding access points for dents—small holes or notches that let a tech use a hammer and dolly to pop out a dent from the inside. For a recent client’s trailer fender, we added two ½ inch holes on the inside edge, so if the fender gets dented, a tech can reach through the hole to push the dent out, instead of having to remove the entire fender. Their service team told us this cut fender repair time by 70% and eliminated the need to replace dented fenders entirely.
Last, but certainly not least, consider the environment where maintenance happens. A service tech working on a farm at 6 a.m. in the rain has very different needs than a tech working in a climate-controlled factory. We see a lot of designs that work great in a CAD lab but fall apart in real-world maintenance conditions. For example, in dirty or oily environments (like construction sites or food processing plants), screws can get clogged with dirt or grease, making them hard to turn. We recommend using Phillips-head or hex-head screws instead of Torx heads in these environments—Torx heads can fill with grease or debris, and a standard socket won’t fit. Also, avoid flat washers that can catch dirt; use spring washers that stay seated even if debris builds up. For outdoor equipment, like farm tractors or construction vehicles, maintenance happens in cold, heat, or rain. We design parts with drain holes in any enclosed areas—if water gets trapped inside a control box or access panel, it can cause rust or electrical issues. We also make sure that fasteners are coated with zinc or another corrosion-resistant finish, so they don’t seize up after a few years in the sun or rain. We had a client in Florida who had a fleet of landscaping trucks that were seizing up after two years because their access panel screws weren’t coated. We redesigned the screws to have a zinc finish, added drain holes to the panels, and the problem was completely solved. Now, their maintenance team rarely has to replace seized fasteners, saving them hundreds of dollars a month in replacement parts and labor.
At the end of the day, designing sheet metal parts for low-cost maintenance isn’t just about making parts cheaper—it’s about making equipment keep working, when you need it most. Every small tweak, from a fastener placement to a drain hole, adds up to less downtime, less labor, and less waste. Our team has worked on hundreds of these projects, and we know that the best designs come from listening to the people who actually do the maintenance. If you’re designing new equipment or looking to update existing parts to cut maintenance costs, we’re here to help. We don’t just supply sheet metal parts—we partner with you to build parts that are easy to service, durable, and cost-effective. If you have a project in mind, reach out to our team to discuss how we can tailor a design that fits your maintenance needs.
Worms References
- Bureau of Labor Statistics. (2024). Occupational Employment and Wage Statistics: Maintenance and Repair Workers, General.
- ASM International. (2022). Design for Maintenance and Repair in Sheet Metal Fabrication.
- Society of Manufacturing Engineers. (2023). Standardization Strategies for Reducing Industrial Equipment Downtime.
- National Institute for Occupational Safety and Health. (2021). Ergonomic Design Considerations for Industrial Service Work.
Kunshan SuperGoodRay Precision Technology Co., Ltd.
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