Custom Precision CNC Machined Brass Balls for Valves

We produce precision CNC-machined brass balls for ball valves, with mirror-level surface finish, high precision, and perfect sealing performance. Whether you need 10 pieces for design validation or low volume production, we use the same high-precision CNC machining throughout — only switching to hot forging pre-forming when volume production, so you enjoy genuine cost reduction without ever sacrificing quality.

Why Brass + CNC is the Gold Standard for Valve Balls

Brass alloys such as C36000, CW617N, H59, and lead-free C2801 were practically used for CNC machining.

Mirror-smooth surface finish with no burrs — the ball glides against seals smoothly and no leakage.
Extremely high precision, repeatable tolerances: diameter ±0.01 mm
Immediate compliance with drinking-water and food-contact regulations (NSF/ANSI 61, GB/T 17219, FDA) when lead-free grade brass is selected for your valves.

CNC Machining: Covering All Order Phases, Cost Optimization for Mass Production

As the core process, CNC machining caters to needs from trial batches to mass production, with clear cost optimization logic

1. Small-Batch Trial Production: Direct CNC Machining. We machine every ball 100 % by CNC machining directly. No tooling cost, no delays. Change a diameter, add a pressure-relief hole, or modify the stem slot — we update the program and run new parts in few days. You receive fine machined brass balls from the very first piece, so assembly trials and leakage tests are completely realistic.
2. Mass Production: Cost Reduction with hot forging: Once the design is verified and volumes grow, we introduce hot forging to create near-net-shape blanks. Then CNC machining takes over for final dimensions, mirror surfaces, grooves, holes. The result: you keep the exact same mirror finish and precision you validated in prototyping, but unit cost drops 15–40 % depending on annual volume.

Perfectly Matched to Your Application

1. Household & plumbing valves
   Fast prototyping, easy-clean mirror surfaces that resist limescale, and dramatic cost reduction the moment volume ramps.
2. HVAC and light industrial valves
   Rock-solid sealing under constant thermal cycling, combined with the shortest possible scale-up timeline and 20–40 % lower piece price in production.
3. Food-grade, beverage, and pure-water systems
   Lead-free brass machined to a dead-angle-free mirror finish, fully certified and ready for the strictest hygiene requirements.

Start Your Project and Get a Quote

Send email to RFQ@kinsaimachining.com with following details:

Drawing files (preferably in STEP/IGES/PDF format) and detailed requirements.
Order quantity (prototypes / small batch / volume production)
Shipping plan.
NDA requst if needed.

Kinsai team will respond within 24 hours with a quick quotation.