Octagonal Sealing Flange Block in TC4 Titanium, CNC Milled
TC4 titanium octagonal sealing flange: 18X M3 hole pattern at 0.1 to 0.2 position, flatness 0.05 mm, seal steps 2.12 +0.05, R2 seal lip, 172.5 mm span, CMM 100 percent. Quote in 24 hours.
Semiconductor & Optics
An octagonal titanium sealing flange with a large see through window: 18X M3 threaded holes positioned at 0.1 to 0.2 mm, flatness 0.05 mm, R2 seal lip and 2.12 +0.05 mm seal groove for high integrity gasket joints, CMM checked hole by hole.
Or email drawings to kgl@kglmfc.com
Key Specifications
| Parameter | KGL Capability |
|---|---|
| Material | TC4 titanium alloy (Ti-6Al-4V) |
| Process | Precision plate sizing, vertical and 5 axis CNC milling of octagon profile and window, seal step and R2 lip machining, drilling and tapping 18X M3, counterboring, micro deburring, ultrasonic cleaning |
| Seal geometry | R2 seal lip, steps 2.12 (+0.05) mm and 7.12 (+0.05) mm deep |
| Hole pattern | 18X M3 x 7.3 mm deep, position 0.1 to 0.2 A-B-C |
| Flatness | 0.05 mm on datum face A |
| Span | About 172.5 mm across the octagon |
| Inspection | CMM 100 percent coordinate check, depth micrometer on seal groove, M3 thread plug gauges |
| Tolerance | ±0.005 mm standard on metals, engineering plastics, and carbon fiber composite |
| Certifications | ISO 9001:2015, ISO 13485:2016, AS9100D |
| Capacity | 100+ CNC machines including 11 five-axis centers |
| MOQ | No MOQ; 1-piece prototypes supported |
| Quote | Within 24 hours for complete 2D/3D files |
About This Part
Sealing flanges live or die on flatness. This octagonal frame is cut from TC4 titanium with a large open window in the center, which is exactly the geometry that wants to warp, so the route is built around stress release: rough the profile and window, release, finish mill the faces, then cut the seal features last. Flatness on datum face A holds at 0.05 mm across the 172.5 mm span.
The seal train is a raised R2 lip with a 2.12 (+0.05) mm and 7.12 (+0.05) mm stepped groove, sized so the gasket compresses evenly around the octagon. Eighteen M3 holes, 7.3 mm deep, ring the perimeter with position held at 0.1 to 0.2 against A, B, and C, so bolt clamp load distributes without distorting the seal line.
Titanium hates heat and loves galling, so machining runs at controlled speeds with flood coolant and sharp tooling. Burrs around the small holes are removed under magnification because a loose chip inside a vacuum flange is a failure you find weeks later. Every piece is CMM checked for hole position and seal geometry, with a depth micrometer on the groove and thread gauges on all 18 holes.
This part family supports the Semiconductor Parts industry. Read how KGL machines parts for that sector, then send your drawing for a quote.
Why Machine It at KGL
Five-Axis Fleet
100+ CNC machines including 11 five-axis centers run complex geometry in single setups, so tolerances do not stack up across refixturing.
Verified Accuracy
±0.005 mm standard on metals, plastics, and carbon fiber composite, verified on Hexagon and Zeiss CMMs (0.0015 mm accuracy).
Fast Prototypes
Engineering feedback with every quotation; prototype parts typically machined in 15 to 25 days.
One Supplier, End to End
Material sourcing, machining, heat treatment coordination, finishing, CMM inspection and export packaging under one roof.
Part-Specific Advantages
- Octagonal frame with large see through window in TC4 titanium
- R2 raised seal lip with 2.12 (+0.05) and 7.12 (+0.05) mm stepped seal groove
- 18X M3 threaded holes, 7.3 mm deep, position 0.1 to 0.2 A-B-C
- Datum face flatness 0.05 mm across the 172.5 mm span
- Stress release passes between roughing and finishing to control warp
- CMM 100 percent on hole position, depth micrometer and thread gauges on seal train
Typical Applications
- Sealing flanges for vacuum chambers and semiconductor process equipment
- Gasket sealed inspection windows on titanium hardware
- High strength to weight sealed frames in precision instruments
Commercial Terms
| Commercial | Detail |
|---|---|
| MOQ | No MOQ; 1-piece prototype supported |
| Quote | Within 24 hours for complete 2D/3D files |
| Terms | EXW / FOB Shenzhen |
| Certifications | ISO 9001:2015 |
| Packaging | Individual bubble wrap, export carton or wooden case |
Common Questions
Why titanium for a sealing flange?
TC4 gives you high stiffness at low weight plus corrosion resistance that survives process chemistries and cleaning cycles. For vacuum work it also outgasses far less than coated aluminum alternatives.
How do you keep an open frame flat while machining it?
Roughing, stress release, then finishing, with the seal features cut last. The flatness target of 0.05 mm is measured on the CMM with the part resting free, the same way it sits in service.
Can the seal groove take a metal gasket instead of rubber?
The 2.12 +0.05 groove as drawn suits elastomer or polymer gaskets. For metal C ring or o-ring cord seals send the gasket spec and we will adjust groove width and finish before quoting.
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