Precision 304 Stainless Steel Flange with High-Accuracy Flatness and Sealing Performance

We successfully manufactured a precision 304 stainless steel flange for a semiconductor automation equipment application. This critical sealing interface component requires exceptional flatness and surface finish to ensure reliable vacuum or fluid sealing in semiconductor processing environments — presenting significant machining challenges including stringent flange flatness requirements and high-precision sealing surface finish. Through single-setup CNC turning and milling with precision facing operations, we delivered flanges meeting semiconductor-grade sealing performance standards.

Project Overview

Key Technical Highlights

• Precision Flange Flatness and Seal Surface Finish: Achieved ≤0.005mm flatness and Ra≤0.4μm surface finish on the sealing face through single-setup precision facing with optimized finishing parameters — ensuring leak-proof sealing in semiconductor vacuum and fluid systems.
• Process Innovation:
  • Single-Setup Turn-Mill: Both turning and milling operations performed in a single fixturing setup from a common datum — maintaining perfect geometric alignment between the seal face, bolt hole pattern, and bore.
  • Precision Seal Face Finishing: Light finishing passes with controlled feed rates and sharp tooling achieve micron-level flatness and mirror-like surface finish — critical for O-ring/gasket sealing performance.
  • Bolt Hole Pattern Accuracy: Precision indexing and drilling operations maintain consistent bolt hole positioning for reliable flange-to-flange mating.
  • 304 Stainless Steel Machining: Optimized cutting parameters and tooling selection manage work hardening tendencies — ensuring consistent dimensional accuracy and surface finish.
• Surface Quality:
  • Seal face achieves ≤0.005mm flatness with Ra≤0.4μm finish — meeting semiconductor-grade sealing requirements.
  • All flange surfaces burr-free and ready for assembly.

Quality Verification

Each component underwent comprehensive inspection using CMM measurement for flange flatness (≤0.005mm) and dimensional accuracy (±0.015mm), supplemented by surface roughness testing (Ra≤0.4μm on seal face) and visual inspection.

Industry Applications

This solution demonstrates our expertise in precision sealing component manufacturing, ideal for:
✓ Semiconductor vacuum flanges ✓ Fluid sealing interfaces ✓ Precision equipment flanges ✓ Automation system connections

Why Partner With Us?

• Proven expertise in precision flange flatness control (≤0.005mm)
• Advanced seal surface finishing (Ra≤0.4μm) for leak-proof sealing
• Single-setup turn-mill for consistent geometric alignment
• 12+ years of precision manufacturing experience across semiconductor and automation sectors