If you’ve ever reached out to a custom metal parts supplier for a quote, you’ve probably noticed that the same design, same quantity, and same delivery timeline can yield wildly different price tags—all because of one critical variable you might not have dug into at first: the material. Over the 12 years I’ve run this custom metal parts shop, I’ve quoted everything from tiny 3D-printed aerospace fasteners to large structural brackets for agricultural equipment, and 70% of the time, a client’s sticker shock or a last-minute shift in budget traces back to a material choice they didn’t fully weigh before hitting “request quote.” Today, I want to pull back the curtain on how material choices directly shape cost, from the raw mill price all the way to the finished part leaving our loading dock. Custom Metal Parts
Let’s start with the most basic driver: raw material pricing. This isn’t just about picking aluminum vs. steel—each grade has its own market volatility, purity requirements, and supply chain costs that shift weekly. For example, a client once came to us needing brackets for a construction crane and initially specified 1018 carbon steel, a common, low-cost steel used in general fabrication. We quoted $12.75 per part for a run of 500. But then, after seeing a competitor’s slightly lower number, they switched to 4140 alloy steel, thinking it was just a “step up” in strength for the same price. That single grade jump pushed the raw material cost up 42% on that order, leading to a final quote of $18.10 per part. Why? 4140 is a heat-treatable alloy with chromium and molybdenum, which are rare earth metals that trade on global commodities markets. In 2022 alone, 4140 raw bar prices fluctuated 18% due to supply chain snags from mines in Australia and South Africa, while 1018’s price only shifted 7% over the same period, since it’s made primarily from iron ore, a more abundant material.
It’s not just specialty alloys, either. Even two common aluminum grades can have a massive price gap. 6061-T6 aluminum, the workhorse of many custom projects, is made with magnesium and silicon, and its raw price sits at roughly $2.20 per pound in North America as of 2024. But 7075-T6, often chosen for aerospace parts because it’s 30% stronger than 6061, has zinc added, and that makes it 2.7 times more expensive per pound—$5.95. A client building a drone frame once tried to cut costs by switching from 7075 to 6061, but when we ran a material compatibility test for their high-vibration application, we warned them 6061 would fatigue after 1,000 cycles, while 7075 would last 10,000. They ended up adjusting their design slightly to reduce the number of parts, so they could stick with 7075 and avoid premature failure, but that material choice meant their per-part cost went up, and so did the overall budget for the project.
Next on the cost scale is machinability, a property that defines how easily a material can be cut, drilled, shaped, and formed without causing tool wear, defects, or extra production time. This is where even materials with similar raw prices can have very different finished part costs. Let’s say we have two 1-inch round bars: 304 stainless steel, which costs about $3.10 per pound, and 316 stainless steel, which is also around $3.20 per pound at current rates. At first glance, they’re almost the same, but 316 has molybdenum, a component that makes it corrosion-resistant but also makes it 40% harder to machine. When we run a CNC mill on 304, the tool lasts 120 minutes before needing a replacement, and we can cut at a speed of 800 surface feet per minute (SFM). On 316, the tool only lasts 70 minutes, and we have to slow the speed to 550 SFM to avoid burning the material or chipping the cutting edge. For a run of 1,000 parts, that means 3 extra hours of machine time, 2 more tooling sets, and an extra $450 in labor and supplies—all adding $0.45 per part, even though the raw material price difference is only $0.10 per pound. That’s a hidden cost that many buyers don’t factor in until they get the quote breakdown.
Tool wear also becomes even more dramatic with harder materials like titanium. Titanium has a high strength-to-weight ratio that makes it ideal for medical implants or aerospace parts, but its machinability is so low that tooling costs can triple or quadruple compared to aluminum. A client working on a hip implant prototype once wanted to use titanium Ti-6Al-4V, and when we quoted their first 5-part prototype, the tooling alone made up 35% of the total cost. They initially thought titanium would cost about the same as 316 stainless, but once we explained that we use coated carbide tools specifically for titanium, which cost $120 each vs. $30 for standard steel tools, and that each part required a full tool change mid-run, they adjusted to a design with simpler features that cut the number of tool changes in half. The finished prototype cost went down, and they still got the corrosion resistance and biocompatibility they needed.
Formability is another material property that shapes cost, especially for parts that are stamped, bent, or drawn into shape, rather than machined from solid bar or plate. Materials that are highly formable can be shaped in fewer operations, with less scrap, leading to lower costs, while brittle or low-formability materials require multiple steps, higher force, and more waste. For example, brass C260 is a yellow brass with excellent formability—we can bend it 180 degrees without cracking, draw it into thin tubes, and it only has a 5% scrap rate during forming. That makes it a popular choice for electrical connectors, and its raw price is around $2.80 per pound. Compare that to phosphor bronze C510, which is stiffer and less formable. It can only bend 90 degrees before cracking, and its scrap rate during drawing is 15%. For a run of 10,000 small connector housings, that means we have to scrap 1,500 parts with phosphor bronze vs. 500 with brass. Raw material is the biggest expense, so that extra 1,000 scrapped parts adds up to $2,800 in wasted material, plus extra labor to process the scrap and rework the bad parts. Even though phosphor bronze costs slightly less per pound ($2.70) than brass, the total cost for that run is actually higher—by about $0.25 per part.
Scrap rate ties right into yield, a key metric we use for custom parts, especially when working with sheet metal or plate. Some materials have higher scrap rates not just because of formability, but because of size and availability. If you need a custom part that requires a 48-inch plate, and the only size available is 60 inches, you have to cut off 12 inches of scrap, and if that scrap can’t be reused for smaller parts (because it’s a specialized grade like Inconel, a high-temperature alloy used for jet engine parts), that’s wasted material that adds to cost. A few years ago, a client needed a small valve component made from Inconel 718, which is used for its ability to withstand extreme heat in industrial furnaces. The smallest plate we could source was 24 inches square, but the part only needed a 4-inch square blank. That left us with 20 inches of scrap, which is worthless because Inconel 718 has a very narrow melt range and can’t be cut down to smaller blanks for other projects without compromising its properties. We had to explain that this scrap would add $1,200 to their total order cost, and while they could have switched to a different alloy with similar heat resistance (like stainless steel 309), it wouldn’t hold up to the 1,200°F operating temperature they needed. So they paid the scrap cost, but we helped them redesign the part to fit a slightly smaller plate in their next order, bringing the scrap rate down to 10% instead of 83%.
Surface finish and post-processing are two more areas where material choice impacts cost, and they’re often overlooked until the part is nearly done. Some materials are naturally corrosion-resistant, so they don’t need plating or coating, while others require treatment to meet a client’s requirements. For example, aluminum 6061 can be anodized to increase its corrosion resistance and add color, and anodizing costs about $0.15 per square foot. But aluminum 5052, a marine-grade alloy, already has better corrosion resistance, so it can be powder-coated instead, which costs about $0.10 per square foot. That’s a small difference, but if your part has 10 square feet of surface area, that’s a $0.50 per part gap for a run of 10,000 parts—$5,000 total. On the other hand, if you need a part to be non-magnetic, 304 stainless is non-magnetic naturally, but 1018 carbon steel has to be electroplated with nickel or zinc, which adds $0.30 per part and extra processing time. A client in the medical device industry once ordered 1,000 guide pins, and they initially chose 1018 carbon steel because it was cheaper raw material. But when we ran a test, the plating process added so much thickness that the pin was too tight to fit into the device’s housing, and we had to add a secondary machining step to grind down the plating. That extra step added $0.75 per part, making the total cost for the carbon steel pin almost the same as a 304 stainless pin, which didn’t need secondary processing.
Certifications and compliance are another layer that ties into material cost, especially for industries like aerospace, medical devices, and defense that require traceability for every part. If a client needs parts made from material with a mill test report (MTR) that verifies its chemical composition and mechanical properties, we have to source the material from suppliers that can provide those reports, and that markup is passed on. For example, a standard 6061 aluminum bar without an MTR costs $2.10 per pound, but a certified bar with full traceability for aerospace applications costs $2.45 per pound. For a 50-pound part, that’s a $17.50 difference, and if the order is 1,000 parts, that’s $17,500 in extra cost. We had a aerospace client who needed parts for a satellite component, and they were willing to pay for certified material because even a small material defect could cause a multi-million-dollar satellite to fail. But we also worked with a local bike manufacturer that didn’t need aerospace-grade certification, so we could source cheaper, non-certified 6061, keeping their part costs low without compromising performance for their application.
Now, I don’t want to make it sound like the most expensive material is always the right choice. The key is matching the material properties to your specific application, not just picking the cheapest option or the “best” material. Last year, a client came to us for a bracket for a conveyor system in a food processing plant. They initially asked for 316 stainless steel, which is the go-to for food-grade applications. We quoted them $14 per part for a run of 2,000 parts, but after talking through their needs, we found that the conveyor only uses mild cleaning chemicals, not the harsh brines or acids that require 316’s molybdenum content. We suggested 304 stainless steel, which is still food-safe, corrosion-resistant enough for their application, and costs $3.10 per pound vs. 316’s $3.50 per pound. The finished part cost dropped to $9.25, a 34% savings, without any impact on performance. That’s the kind of value we focus on at our shop: helping clients make material choices that balance cost, performance, and long-term reliability.
If you’re planning a custom metal parts project, the material choice is one of the most impactful decisions you’ll make for your budget and part performance. Don’t hesitate to reach out for a detailed quote, and we can walk through material options, machinability, compliance, and every factor that shapes the final cost to make sure you get the best part for your needs.
Custom Metal Parts References
ASM International. (2020). Machinability of Metals. ASM Handbook Volume 16: Machining, 10th Edition.
MatWeb. (2024). Material Property Data: Aluminum, Steel, and Alloys. Retrieved from industry material databases.
Metal Forming Division. (2023). Formability of Sheet Metals: Industry Guidelines for Stamping and Bending. Society of Manufacturing Engineers.
International Organization for Standardization. (2021). ISO 9001:2015 – Quality Management Systems for Material Traceability.
Qingdao Xinding Huiyuan Industry and Trade Co., Ltd.
We are one of the most experienced custom metal parts manufacturers and suppliers in China. With a professional production team, we are able to meet the needs of the majority of our customers. Please rest assured to wholesale custom metal parts at competitive price from our factory.
Address: No.149, Yuyuan Street, Chenggang Road, Laizhou City, Yantai City, Shandong Province
E-mail: lin@lzhdwj.cn
WebSite: https://www.hdmetalparts.com/
