Fuyao Quartz manufactures custom fused quartz threaded flanges and tube connectors for laboratory instruments, semiconductor equipment, high-temperature processing systems, chemical reaction devices and customized quartz assemblies. The products shown in the images feature transparent cylindrical quartz bodies, precision-machined thread sections, central through-bores, stepped shoulders and customized tube connection ends.
Unlike conventional flat quartz flanges, these components use an integrated cylindrical structure. The thicker transparent section functions as the flange body, positioning section or equipment interface, while the machined threaded area provides mechanical connection and assembly capability. Depending on the customer’s drawing, the component may include an open central bore, a reduced tube outlet, an extended neck, a sealing surface or an additional positioning step.
The images show several representative configurations, including a large-bore threaded quartz flange, a threaded reducing flange with an extended tube neck and a small-diameter threaded quartz connector. These products are normally manufactured according to customer drawings because thread diameter, pitch, bore size, wall thickness and sealing requirements vary significantly between different equipment designs.
Product Structures Shown
Large-Bore Quartz Threaded Flange
The larger component with a wide central opening consists of a thick transparent quartz flange body and an externally threaded upper section. The central bore passes through the component and can be connected to a quartz tube, reaction chamber, gas line or other equipment interface.
This structure is suitable for applications that require:
- A relatively large flow passage
- A threaded mechanical connection
- Accurate positioning between two components
- A thick quartz body for assembly support
- A customized bore or sealing interface
The polished lower section provides clear visibility of the internal passage, while the frosted appearance of the thread area is created by precision grinding and thread machining.
Quartz Threaded Reducing Flange
The taller product shown in the images includes a large transparent flange body, an externally threaded middle section and a smaller-diameter tube extension at the top.
This configuration can be used as a transition between components of different diameters. It is commonly described as a:
- Quartz threaded reducing flange
- Quartz flange adapter
- Quartz tube transition connector
- Quartz threaded nozzle flange
- Quartz inlet or outlet connector
The extended neck may be connected to another quartz tube, flexible line, sealing assembly or instrument interface. The final function depends on the customer’s equipment design.
Small-Diameter Quartz Threaded Connector
The slender component features a small threaded end, a precision internal bore and a long transparent tube body. It may be used as a small gas inlet, sampling connector, sensor sleeve, liquid delivery interface or precision quartz tube fitting.
For website publication, it is safer to describe this part as a small-bore quartz threaded flange connector, unless its exact gas, liquid or vacuum function has been confirmed.
Key Product Features
High-Purity Fused Quartz Material
The flanges can be manufactured from high-purity fused quartz selected according to the operating environment. Fused quartz offers excellent heat resistance, low thermal expansion, chemical stability and low contamination potential.
Material grade and purity requirements should be confirmed during quotation, especially for semiconductor, optical or high-purity laboratory applications.
Integrated Quartz Construction
The flange body, thread section, internal bore and tube extension can be manufactured as an integrated quartz component. This reduces the need for bonded joints between separate quartz parts and provides a clean, compact connection structure.
Precision-Machined Threads
External or internal threads can be processed according to customer drawings. Available thread-related requirements may include:
- Thread major diameter
- Thread minor diameter
- Thread pitch
- Effective thread length
- Thread profile
- Entry chamfer
- Matching nut dimensions
- Assembly clearance
Quartz threads are more fragile than metal threads. They should be installed carefully and should not be subjected to excessive tightening torque.
Custom Bore and Flow Passage
The internal bore can be produced in different diameters and profiles according to gas flow, liquid flow, sample transfer or equipment connection requirements.
Available bore structures may include:
- Straight through-bore
- Reduced bore
- Stepped bore
- Tapered transition
- Small capillary passage
- Large-diameter opening
- Tube-to-flange transition
Polished and Frosted Surface Combination
The transparent cylindrical sections shown in the images are polished to provide a smooth, clear appearance. The threaded sections are typically ground or machined and therefore have a white or frosted appearance.
This visible difference is normal for precision-machined quartz components and does not indicate the use of a different material.
Typical Custom Specifications
| Item | Available Options |
|---|---|
| Material | Fused quartz glass |
| Product Type | Threaded flange, reducing flange, tube connector |
| Flange Body Diameter | Customized |
| Central Bore Diameter | Customized |
| Overall Length | Customized |
| Thread Type | Metric, drawing-specific or custom |
| Thread Pitch | According to drawing |
| Thread Position | External or internal thread |
| Tube Extension | Straight, reduced or stepped |
| Surface Finish | Transparent polished, ground or frosted |
| End Treatment | Ground, polished or flame-polished |
| Structure | Through-hole, reducing bore or stepped bore |
| Tolerance | According to drawing and feasibility review |
| Quantity | Prototype, small batch or repeat production |
All dimensions should be confirmed according to the customer’s technical drawing. Standard metal pipe-thread tolerances cannot automatically be applied to quartz parts because quartz is a brittle, non-metallic material.
Manufacturing Capabilities
Fuyao Quartz provides custom processing for threaded quartz flanges and related tubular parts, including:
- Quartz tube cutting
- Cylindrical grinding
- Precision drilling
- Internal bore processing
- External thread machining
- Internal thread machining
- Step and shoulder machining
- Diameter reduction
- End-face grinding
- End-face polishing
- Flame polishing
- Quartz tube welding
- Custom flange assembly
- Cleaning and protective packaging
Before production, our engineering team reviews the drawing to evaluate minimum wall thickness, thread depth, edge strength, transition radius and machining feasibility.
Typical Applications
Custom quartz threaded flanges and connectors can be used in:
Semiconductor Equipment
- Gas inlet and outlet assemblies
- Quartz process chambers
- Furnace tube connections
- Cleaning equipment
- Deposition equipment
- Sensor interfaces
- Low-contamination process systems
Laboratory and Chemical Equipment
- Quartz reaction vessels
- Sampling systems
- High-temperature experiments
- Gas delivery devices
- Chemical analysis equipment
- Laboratory quartzware assemblies
- Custom reactor connections
High-Temperature Furnace Systems
- Furnace tube interfaces
- Heating chamber connections
- Thermocouple protection assemblies
- Observation systems
- Gas introduction components
- Exhaust and process tube connectors
Optical and Analytical Instruments
- Spectroscopy equipment
- Optical cells
- UV analysis systems
- Sensor housings
- Precision sample delivery
- Instrument connection components
Installation Considerations
Quartz threaded flanges should be handled differently from metal fittings. Quartz is hard, heat-resistant and chemically stable, but it is also brittle.
During installation:
- Avoid excessive tightening force
- Do not use metal tools directly on the quartz thread
- Use compatible sealing gaskets or sleeves
- Prevent side loading and bending stress
- Keep the mating thread clean
- Confirm thermal expansion differences between quartz and surrounding materials
- Use PTFE, PFA or another suitable cushioning material when required
The final sealing performance depends not only on the quartz flange but also on the matching nut, gasket, O-ring, sleeve and equipment interface.
Quality Inspection
Inspection can be carried out according to the approved customer drawing. Typical inspection items include:
- Overall dimensions
- Flange body diameter
- Tube outer and inner diameter
- Central bore diameter
- Thread diameter and pitch
- Effective thread length
- Concentricity
- Straightness
- End-face condition
- Surface scratches
- Edge chips
- Cracks
- Internal bubbles and inclusions
- Visual transparency
- Assembly fit with matching components
For critical applications, customers should specify the required inspection method and acceptance criteria before production.
Information Required for Quotation
To prepare an accurate quotation, please provide:
- Flange body diameter
- Overall length
- Central bore diameter
- Thread major diameter
- Thread pitch and thread profile
- Effective thread length
- Tube extension dimensions
- Dimensional tolerances
- Surface finish requirements
- Operating temperature
- Process gas or liquid
- Sealing method
- Required quantity
- Technical drawing or physical sample
A drawing in PDF, DWG, DXF or STEP format is strongly recommended for customized quartz flange projects.
Why Choose Fuyao Quartz
Fuyao Quartz supplies both standard quartz products and precision-machined custom components. Our manufacturing service supports engineering evaluation, prototype production, dimensional inspection and repeat batch supply.
Our capabilities include:
- Custom threaded quartz flange manufacturing
- Large-bore and small-bore structures
- Straight and reducing connectors
- Precision quartz tube machining
- Drawing-based OEM production
- Prototype and small-batch orders
- Dimensional inspection before shipment
- Protective packaging for international delivery
- Technical support for custom quartz assemblies
Whether you require a large quartz threaded flange, a reducing flange adapter, a small-diameter inlet connector or a complete quartz connection assembly, Fuyao Quartz can manufacture the product according to your equipment interface and application requirements.
FAQ
1. Can the quartz flange thread size and bore diameter be customized?
Yes. The thread diameter, pitch, effective thread length, flange body diameter, central bore and tube extension can all be manufactured according to the customer’s drawing. Because quartz threads cannot always follow the same tolerance rules as metal threads, the design will be reviewed for machining feasibility before production.
2. Can quartz threaded flanges be used in vacuum or high-temperature equipment?
They can be used in certain vacuum and high-temperature systems, but suitability depends on the flange dimensions, wall thickness, sealing structure, operating temperature, pressure difference and matching components. Customers should provide the actual operating conditions so that the structure can be evaluated before manufacturing.
3. What information is needed to order a custom quartz threaded flange?
Please provide the overall dimensions, flange body diameter, internal bore, thread diameter, thread pitch, thread length, tube extension size, tolerance, surface finish, application, quantity and technical drawing. Information about the matching nut, gasket or sealing method is also helpful.
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