{"id":7240,"date":"2026-01-21T15:46:13","date_gmt":"2026-01-21T07:46:13","guid":{"rendered":"https:\/\/www.jstindustry.com\/?p=7240"},"modified":"2026-01-28T15:46:46","modified_gmt":"2026-01-28T07:46:46","slug":"brass-cnc-turned-parts-manufacturing-guide","status":"publish","type":"post","link":"https:\/\/www.jstindustry.com\/ja\/brass-cnc-turned-parts-manufacturing-guide.html","title":{"rendered":"\u771f\u936eCNC\u65cb\u76e4\u52a0\u5de5\u90e8\u54c1\u88fd\u9020\u7dcf\u5408\u30ac\u30a4\u30c9"},"content":{"rendered":"
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Brass has been a go-to material in precision machining for decades, and honestly, it’s not hard to see why. The alloy machines beautifully, resists corrosion well enough for most environments, and offers that balance of strength and workability that manufacturers genuinely appreciate. This guide walks through what matters when it comes to brass CNC turned parts<\/strong><\/a> \u2014 from material grades to quality benchmarks and everything in between.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Why Brass Remains a Top Choice for Brass CNC Turned Parts<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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There’s something about brass that keeps it relevant even as newer alloys hit the market. It feeds through CNC lathes smoothly, produces clean chips, and doesn’t wear down tooling the way harder metals do. For components like valve stems, electrical connectors, and plumbing fittings, brass CNC turned parts consistently deliver on both performance and cost-efficiency.<\/p>

The thermal conductivity is decent, the machinability rating is among the highest of any common alloy, and it takes well to various surface treatments. Not every material can check all those boxes at once.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Common Brass Alloys Used in CNC Turning<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Alloy<\/b><\/strong><\/td>\n Composition<\/b><\/strong><\/td>\n Key Properties<\/b><\/strong><\/td>\n Typical Applications<\/b><\/strong><\/td>\n <\/tr>\n
C36000 (Free-Cutting Brass)<\/td>\n 61.5% Cu, 35.5% Zn, 3% Pb<\/td>\n Excellent machinability, moderate strength<\/td>\n Fittings, valves, fasteners<\/td>\n <\/tr>\n
C26000 (Cartridge Brass)<\/td>\n 70% Cu, 30% Zn<\/td>\n Good cold workability, higher ductility<\/td>\n Electrical terminals, pins<\/td>\n <\/tr>\n
C46400 (Naval Brass)<\/td>\n 60% Cu, 39.2% Zn, 0.8% Sn<\/td>\n Superior corrosion resistance<\/td>\n Marine hardware, pump shafts<\/td>\n <\/tr>\n
C48500 (Leaded Naval Brass)<\/td>\n 60% Cu, 37% Zn, 1.8% Pb, 0.8% Sn<\/td>\n Good machinability with corrosion resistance<\/td>\n Marine fittings, heavy-duty connectors<\/td>\n <\/tr>\n <\/tbody>\n <\/table>\n<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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C36000 probably accounts for the majority of turned brass components out there. Its lead content \u2014 while increasingly scrutinized from a regulatory standpoint \u2014 makes it exceptionally easy to machine at high speeds.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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The Manufacturing Process Behind Brass CNC Turned Parts<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Understanding how these components actually get made helps when specifying parts or evaluating suppliers.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Step-by-Step Production Workflow<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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  1. Material selection and bar stock procurement based on application requirements<\/li>
  2. CNC programming and toolpath generation using CAD\/CAM software<\/li>
  3. Machine setup including chuck configuration, tool loading, and coolant systems<\/li>
  4. Precision turning operations \u2014 facing, boring, threading, grooving, and knurling<\/li>
  5. Secondary operations such as cross-drilling, milling, or tapping if needed<\/li>
  6. Deburring and surface finishing<\/li>
  7. Dimensional inspection and quality verification<\/li><\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    Achievable Tolerances and Surface Finish<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    Most CNC lathes can hold tolerances of \u00b10.01mm on brass without too much trouble. Some shops push tighter \u2014 down to \u00b10.005mm \u2014 though that typically requires newer equipment and more careful process control.<\/p>

    Surface finishes commonly range from Ra 0.4 to Ra 1.6 \u03bcm, depending on the operation. Brass tends to finish cleaner than steel or aluminum in comparable setups, which is one of its underappreciated advantages.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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    Surface Treatment Options for Brass CNC Turned Parts<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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    Raw machined brass looks good on its own, but many applications demand additional finishing. The most common options include:<\/p>