Brass Machining and Supply in Mobile, AL: Free-Machining Parts to Marine Hardware

C360 free-cutting brass holds a machinability rating of 100, which is literally the reference point the machinability of all other metals is compared against, and it earns that rating from its composition. It is a leaded brass, and the small lead additions act as a chip-breaker and internal lubricant: as the tool cuts, the lead helps the chips break into small, manageable pieces rather than forming long stringy swarf, and it reduces friction and built-up edge on the tool. The practical result is that C360 can be cut at high speeds with excellent surface finishes, tight tolerances, and long tool life, with minimal cutting force. That makes it ideal for high-volume production on automatic screw machines and CNC lathes, where parts like fittings, valve bodies, fasteners, and precision components are turned out by the thousands at low cost per piece. Compared with machining stainless steel, titanium, or even pure copper, brass is dramatically faster and easier, which is the main economic reason designers choose it for machined parts. The one caveat is that the lead content raises regulatory concerns in potable-water and some other applications, so where lead is restricted you need a low-lead or lead-free brass alternative, which machines somewhat less easily but still well.

Dezincification is a corrosion process specific to brass in which the zinc is selectively dissolved out of the alloy, leaving behind a spongy, porous mass of copper that retains the part's original shape but has drastically reduced strength. It is insidious because the part can look essentially intact while having lost its structural integrity, leading to sudden failures of fittings, valves, and hardware. The risk rises with higher zinc content and with exposure to aggressive water, including seawater, brackish water, and some treated waters. In Mobile, a port city on the Gulf with marine and saltwater applications throughout its industrial base, dezincification is a real and relevant threat for brass components exposed to that environment. The defense is grade selection: naval brass includes about 1% tin specifically to inhibit dezincification, and other dezincification-resistant (DZR) brasses exist for water service. For marine fittings, fasteners, and hardware in seawater exposure, you should specify naval brass or a DZR grade rather than a standard high-zinc brass like ordinary C360, which is fine for dry or indoor use but vulnerable in aggressive water. Getting this right prevents quiet structural failures that a visual inspection would not catch until it is too late.

The choice hinges on whether the part is machined or formed. C360 free-cutting brass is the right pick when the part is produced by machining, turning, drilling, milling, or threading, because its lead content gives it the best machinability of any common metal, enabling fast, clean, low-cost production of fittings, valve bodies, fasteners, and precision turned parts in volume. C260 cartridge brass, by contrast, has higher copper content (about 70/30 copper to zinc) and is optimized for ductility and formability rather than machining; it is the right choice when the part is made by drawing, stamping, bending, or deep drawing, such as enclosures, formed brackets, terminals, and shells. Trying to use the wrong one fights the material: C360 does not form as well because the lead reduces ductility, and C260 machines poorly compared with the free-cutting grade. So the simple rule is to identify the dominant manufacturing process first, then pick the grade that suits it, machined means C360, formed means C260. If the application also involves seawater or aggressive water exposure, corrosion overrides the process consideration and you should move to naval brass or another dezincification-resistant grade regardless of how the part is made.

Yes, and they are increasingly required rather than optional for potable-water applications. Traditional free-cutting brass like C360 contains lead, which is what gives it its excellent machinability, but lead in components that contact drinking water is regulated, and standards have tightened to limit the lead content of wetted surfaces in plumbing and water-system parts. To meet these requirements, manufacturers use low-lead and lead-free brass alloys engineered to keep good machinability and corrosion resistance while removing the lead. These alloys machine somewhat less easily than C360, which can affect cost and tooling, but they are well established and widely available for valves, fittings, and fixtures that carry potable water. The practical guidance for Mobile buyers is to determine early whether the part contacts drinking water or otherwise falls under low-lead requirements, because that decision drives the alloy selection, the machining approach, and sometimes the certification needed to document compliance. For non-potable industrial, marine, or general hardware applications where lead limits do not apply, standard C360 remains the economical and easy-to-machine choice. When in doubt about a water application, specify a compliant low-lead or lead-free grade and confirm the supplier can document the alloy.