Brass Suppliers and Precision Machining in Lawton, OK — Free-Machining and Formed Components

C360 (60% copper, 35-40% zinc, 2.5-3.7% lead) is the brass grade that Lawton's CNC turning shops reach for on virtually every high-volume precision component. Its machinability rating of 100% — the reference standard against which all other metals are measured — means it cuts faster, produces better surface finish, and allows tighter tolerances than any other commonly machined metal. A shop that can turn 50 stainless parts per shift can turn 300-400 brass parts in the same time on the same equipment. For defense maintenance programs that need large quantities of fittings, valve seats, connector bodies, and similar hardware, C360 keeps part costs competitive while delivering the dimensional accuracy and surface quality that military specifications require. The lead content in C360 that creates its exceptional machinability is also the source of its primary limitation: it cannot be used in potable water contact applications (California Proposition 65 and ANSI/NSF 61 restrict lead-containing brass in drinking water systems) and should not be welded, as lead vaporizes at welding temperatures. For defense fluid system components that contact hydraulic fluid, fuel, or non-potable water, C360 is entirely appropriate. The lead also slightly reduces corrosion resistance compared to unleaded brass alternatives, but for most indoor or protected service environments at Fort Sill facilities, the performance is fully adequate. Dimensional capability on C360 in Lawton's better CNC turning shops runs to ±0.0005 in. on turned diameters with good tooling and a properly warmed-up spindle. Thread cutting — both cut threads and rolled threads — produces excellent results because brass machines cleanly at the thread form without the built-up edge problems that affect copper or the work hardening that plagues stainless. For connectors and fittings that rely on thread engagement for sealing or mechanical retention, brass threads are consistently reliable and measure cleanly on thread gauges.

C260 (70% copper, 30% zinc) is the forming grade of the brass family. Where C360 is optimized for cutting, C260 is designed for cold working — it has excellent ductility, high work hardening rate that builds strength during forming, and uniform microstructure that produces consistent results in deep drawing, stamping, roll forming, and bending operations. The name 'cartridge brass' reflects its historical use in ammunition cases, where deep drawing of brass cups into cartridge cases requires exactly the combination of ductility and work hardening C260 provides. In Lawton's defense industrial context, C260 shows up in sheet metal enclosures, formed clips and brackets, stamped terminal hardware, and drawn tube components. Fabricators working on equipment for Fort Sill sometimes specify C260 for small formed parts where the alternative would be more expensive machining from bar stock — a simple clip or bracket that can be stamped from C260 sheet in seconds might require 5 minutes of CNC milling time from solid bar. C260's machinability is considerably lower than C360 — roughly 30% of the reference standard — so it's not the right choice for precision-turned components where C360 would serve. The tradeoff is intentional: the unleaded composition and higher ductility that make C260 an excellent forming alloy come at the cost of the lead content that makes C360 so machinable. Shops in Lawton that process both grades understand which job goes to which material without needing to be told.

Naval brass (C464, 60% copper, 39.2% zinc, 0.8% tin) adds a small tin addition to the alpha-beta brass base that substantially improves dezincification resistance — the galvanic corrosion mechanism where zinc selectively leaches from brass in certain corrosive environments, leaving behind a weak copper sponge. The risk of dezincification is real in applications involving salt water, high-humidity environments, or certain aggressive fluid chemistries. Military hardware designed for global deployment — including equipment that may serve in tropical, coastal, or high-humidity theater environments — often specifies naval brass or dezincification-resistant brass to prevent this failure mode. At Fort Sill, naval brass appears in marine-compatible hardware on deployable equipment, fluid system fittings for vehicles designed for global operation, and general-purpose fasteners and hardware on equipment that will see variable environments across its service life. The machinability of C464 naval brass (approximately 30% of reference) is lower than C360 but reasonable for moderate-volume machined parts — it's not the grade for high-volume turning, but it's entirely manageable for fittings and valve bodies produced in smaller quantities. Buyers sourcing naval brass in Lawton should confirm the dezincification resistance requirement is actually specified in the drawing or technical specification before upgrading from C360 — the performance premium adds material cost without benefit if the service environment doesn't create dezincification risk. However, when the spec calls for C464 or a dezincification-resistant grade, substituting cheaper C360 is a quality violation that can have real field consequences on deployed military hardware.