A few years back, when I first took over the role of operations lead at my shop—our company has spent 12 years specializing in A193 Hex Bolts, the kind that hold up in high-stress environments like power plants, oil refineries, and heavy construction—waste management wasn’t something we thought much about outside of throwing scrap metal into a bin at the end of each workday. That changed after a routine audit by our local environmental department flagged our steel shavings and spent cutting fluids as “unmonitored industrial waste,” not just regular scrap. I sat down with our lead machinist, Joe, and our sustainability coordinator, Lila, that night, and we realized that handling waste from A193 Hex Bolt manufacturing isn’t just good for the planet—it’s good for our business too. A193 bolts are made from specific alloy steels—usually B7, B8, B8M, right? Those grades have higher tensile strength, corrosion resistance, and heat tolerance than standard carbon steel bolts, which means their manufacturing process generates different waste streams than what you’d get from making a common hex bolt. Over the years, we’ve worked through every step of our production to cut waste, repurpose what we can, and get rid of the rest properly, and I want to walk you through how we do it. A193 Hex Bolts Series
Let’s start at the very beginning of the process, because most waste in A193 Hex Bolt manufacturing starts with raw material preparation. Our raw stock is 10-foot bars of alloy steel, cut down to lengths that make sense for each bolt size we run—we do M10 to M36, mostly, since that’s what our core clients need. Before we cut, we inspect every bar for surface defects, but even with that, each batch has what’s called “mill scale” on the surface: a thin layer of iron oxide that forms when the steel is heated during manufacturing. Years ago, we’d blast the scale off with sand or just machine it away right with the first cuts, and that dust would get sucked into our ventilation system, but most of it would end up in our shop’s waste bin. Now, we pre-treat that mill scale with a low-pressure water jet system at the start of the line, before any machining begins. The water we use is filtered, and the mill scale that’s caught is sold to a local metal reclamation plant—they process it back into new alloy steel feedstock, and that removes about 85% of the surface waste before we even touch the main body of the bolt. We also changed how we cut the raw bars: instead of using abrasive saw blades that create tons of fine metal shavings, we use cold saws with high-speed carbide tips that make clean, straight cuts. The offcuts from these bars are a big win for us too. Because A193 bolts require precise dimensions, we used to throw away any bar piece that was even a quarter-inch shorter than our required length, but now we stock those offcuts in labeled bins for small-batch custom orders. A client who needs 50 M12 bolts? We’ll use the leftover pieces from larger bars instead of cutting new stock, and that cuts our raw material waste by almost 12% across the shop. That’s not just better for the planet—it cuts our material costs too, which we pass along to loyal clients.
Next, the main machining process, which is where most A193 Hex Bolt waste is generated, specifically metal chips and spent cutting fluids. A193 alloy is tough—machining it requires lubricants that can handle high heat and friction, right? If you use a standard cutting fluid, it breaks down fast, becomes contaminated with metal shavings and mill scale, and ends up as hazardous waste. A decade ago, we were sending 25 gallons of used cutting fluid to a disposal service every month, at a cost of over $1,800 a year, plus shipping fees. Now, we use a central fluid recycling system—we installed a large filter unit that pulls metal shavings out of the fluid, removes contaminants via centrifugal separation, and then adds small amounts of fresh lubricant to bring it back to working strength. We check the fluid’s pH level and viscosity every two weeks, and so far, we’ve cut our fresh cutting fluid use by 70% and our hazardous waste from cutting fluids down to almost zero. The metal chips themselves—those fine, curly shavings that come from turning and threading the bolt—are another big stream. We used to bag them up and send them to a general metal recycler, but those would sometimes mix with other shop waste, and the reclamation plant would pay us less because of contamination. Now, we have separate, color-coded bins for each type of chip: B7 alloy chips, B8 stainless steel chips, etc., because B8 is a stainless alloy, and it fetches a higher price than the carbon-based B7. We also have our machinists brush chips out of their work areas at the end of each shift instead of letting them sit mixed with floor sweepings. Last year, we sold 12 tons of sorted metal chips to our reclamation partner for over $11,000—money that goes right back into upgrading our equipment. It’s a small revenue stream, but it means we’re not just sending useful material to landfills.
Wait, let’s talk about the coating process too—A193 hex bolts often get a coating for corrosion resistance, like zinc plating, hot-dip galvanizing, or Xylan, depending on the client’s application. That process generates its own waste, usually called “plating sludge” or spent plating solutions. Early on, we used to send our plating waste to a third-party hazardous waste disposal service, and we had to track every drum, every gallon, to stay in compliance with EPA rules. A mistake in documentation could lead to fines, and we had to pay a premium because we didn’t generate enough waste to qualify for bulk pricing. Now, we work with a local plating waste treatment company that does on-site hauling and treatment, but more importantly, we’ve changed our coating process to minimize waste. For example, when we do zinc plating, we use a closed-loop system that recycles 90% of the rinse water from the plating tanks. The rinse water isn’t just dumped down the drain—it’s filtered, the zinc particles are removed, and the water is reused in the next rinse cycle. We also switched to low-waste plating chemicals: newer formulas that don’t need as much water to rinse, so we use 60% less water per batch than we did five years ago. For clients who don’t need heavy coatings, we now offer a mechanical polishing service that removes surface imperfections without using chemicals, which eliminates all coating-related waste for those orders. Last year, we had a client in the wind energy sector who needed 10,000 M24 bolts for a wind turbine tower—instead of hot-dip galvanizing, we polished them and added a thin, self-drying corrosion inhibitor that’s water-based, and that cut our coating waste for that order by 95%. The client loved it because the bolts performed the same, and their waste disposal costs were lower too.
We also can’t forget about shop floor waste, even the small stuff: worn cutting tools, packaging materials, and leftover paper from quality control checks. A193 hex bolts require strict dimensional checks—we use calipers, micrometers, and magnetic particle inspection to make sure each bolt meets A193 specifications. Years ago, we’d throw away worn carbide cutting tools and drill bits in the metal scrap bin, but those have tungsten carbide, which is a high-value refractory metal that’s worth recycling separately. Now, we send our used cutting tools to a specialized carbide recycler, who melts them down and processes them into new tool blanks. That’s another revenue stream, too—we made $2,800 last year from old tools alone. For packaging, we used to use plastic pallets and shrink wrap for every order, but now we use reusable wooden pallets for local deliveries, and we recycle all shrink wrap and cardboard that we can’t reuse. We also work with a local packaging supplier that takes back plastic packaging materials from our incoming raw material shipments to reuse. Even paper waste: we used to print out full inspection reports for every batch, but now we store all inspection data digitally on a secure server, which cuts our paper waste by almost 100% and means we don’t have to store piles of old paper records.
Of course, none of this is perfect—we’ve had setbacks along the way. Last year, we tried to switch to a new water-based cutting fluid that was supposed to be more efficient, but we didn’t test it properly first, and it broke down faster than expected, leading to more hazardous waste than we’d planned. We had to fix our recycling system and go back to our old (but proven) fluid for a few months while we sorted it out. Another time, a machinist mixed B7 and B8 chips in a bin, and the reclamation plant charged us extra because of cross-contamination—we now have weekly training sessions for all our production staff on waste sorting, and we have a senior operator check every bin at the end of each shift to make sure it’s correct. The biggest lesson we’ve learned is that waste management isn’t just an operations task—it’s something every single person on the team owns. We give small bonuses to machinists who find new ways to reduce waste, and we hold monthly meetings where everyone can share ideas. One of our newer machinists, Mike, suggested that we add small scrap bins next to each lathe for tiny bolt offcuts, which we now use for sample orders, saving us about 5 hours of setup time a week.
For anyone who’s in the market for A193 Hex Bolts, especially for industrial applications, choosing a supplier that handles waste responsibly isn’t just a “nice to have”—it’s a sign that they care about their processes. When a company is meticulous about sorting metal chips, recycling cutting fluids, and minimizing waste, that means they’re also meticulous about quality: if they’re paying attention to every detail of their production, your bolts are less likely to have defects, because they’re using precise, well-maintained equipment.
If you’re working on a project that needs reliable, code-compliant A193 Hex Bolts—whether it’s a power plant upgrade, a bridge construction, or a custom industrial build—we’d be happy to walk you through our waste practices in more detail, or provide documentation of our sustainability efforts. We can also adjust our production process to meet your specific needs, whether that’s small-batch custom bolts, eco-friendly coatings, or bulk orders with minimal packaging. Reach out to our team to discuss your requirements, and we’ll put together a quote that balances quality, cost, and environmental responsibility.
AS1252 Bolts Series References
American Iron and Steel Institute. (2021). Alloy Steel Production and Waste Management Guidelines for Industrial Fasteners.
Occupational Safety and Health Administration (OSHA). (2022). Industrial Waste Handling and Compliance for Metal Fabrication Facilities.
National Association of Metal Recyclers. (2023). Best Practices for Sorting and Recycling Metal Chips from Alloy Steel Manufacturing.
Ningbo Taida Fastener Manufacture Co., Ltd.
Ningbo Taida Fastener Manufacture Co., Ltd. is well-known as one of the leading a193 hex bolts manufacturers and suppliers in China. Please feel free to buy high quality a193 hex bolts at competitive price from our factory. Good service and punctual delivery are available.
Address: No.286 Galaxy Road, Chengdong Industrial Park, Xiangshan Economic Development Zone, Ningbo China
E-mail: suki@tdfasteners.com
WebSite: https://www.td-fasteners.com/
