This custom thick-wall quartz tube is a compact, precision-manufactured fused quartz component with a short cylindrical body and a straight axial hole running through the product. Its structure is different from conventional long quartz tubing. The component has a relatively large outside diameter, short overall length, thick transparent wall, and two flat circular end faces.

The product contains one continuous through hole. It does not have a separate side capillary port. Because fused quartz is transparent and refracts light, the internal wall of the axial bore may appear like an additional tube when viewed from certain angles. In reality, the visible internal structure belongs to the single through bore.

Depending on its intended use, this product may also be described as a quartz sleeve, quartz bushing, quartz spacer, short quartz cylinder, or precision fused silica tube. Its outside diameter, inside diameter, length, surface condition, and dimensional tolerances can be manufactured according to customer drawings.

Short and Thick-Wall Cylindrical Design

The most distinctive characteristic of this component is its compact cylindrical shape. Compared with standard quartz tubing, the wall is considerably thicker in relation to the inner hole diameter. This design provides sufficient quartz material around the bore and gives the component a stable structure during machining, cleaning, handling, and installation.

The short cylindrical form is especially suitable for assemblies where installation space is limited. It can be used as an independent functional part or combined with metal, ceramic, graphite, silicon carbide, glass, or other quartz components.

Possible functions include:

• Positioning and spacing;
• Electrical insulation;
• Thermal isolation;
• Rod or wire protection;
• Sensor installation;
• Gas or liquid guidance;
• Electrode insulation;
• Mechanical alignment;
• High-purity equipment assembly.

The final function depends on the dimensions, operating environment, assembly method, and process requirements.

Precision Axial Through Bore

A straight hole passes through the quartz body along its longitudinal direction. The bore may be used for inserting a rod, wire, electrode, thermocouple, sensor, optical fiber, or small tube. It may also serve as a passage for gas or liquid in customized laboratory and industrial equipment.

The inside diameter can be customized according to the required assembly clearance or flow capacity. Bore position, straightness, diameter tolerance, and concentricity can also be controlled according to the technical drawing.

For applications requiring accurate alignment, the relationship between the inner hole and outside cylindrical surface is important. Controlled concentricity helps the inserted component remain correctly positioned inside the quartz sleeve.

Available bore conditions may include standard machined, ground, cleaned, or fire-finished surfaces. The achievable internal finish depends on the bore diameter, component length, and selected manufacturing process.

High-Purity Fused Quartz Material

The tube can be manufactured from fused quartz or fused silica selected according to the application. Quartz is widely used in high-temperature, semiconductor, optical, chemical, and laboratory equipment because of its combination of thermal, electrical, chemical, and optical properties.

Key material characteristics include:

• Low coefficient of thermal expansion;
• Good thermal shock resistance;
• High electrical insulation;
• Low contamination potential;
• Good chemical stability;
• Transparent appearance;
• High-temperature capability;
• Good dimensional stability under controlled conditions.

Standard industrial fused quartz, high-purity quartz, and selected fused silica grades may be available. The appropriate material should be chosen according to the required purity, wavelength transmission, thermal cycle, process atmosphere, and chemical exposure.

Custom End-Face Processing

Both ends of the tube are formed as flat circular surfaces. The end faces can be processed to different levels depending on whether the component is used for positioning, assembly, optical observation, or sealing contact.

Available end treatments may include:

• Precision ground;
• Fine lapped;
• Transparent polished;
• Frosted;
• Fire polished;
• Chamfered;
• Edge rounded.

Flatness and parallelism can be controlled when the part must stand upright, fit between other components, or maintain accurate axial alignment.

Chamfered or rounded edges are recommended when repeated handling is expected. Edge treatment can reduce the possibility of chipping during cleaning, assembly, packaging, and transportation.

Custom Manufacturing Options

This product is normally manufactured according to specific project requirements rather than supplied as a fixed standard item.

Customizable parameters include:

For small inner holes, thick walls, or tight concentricity requirements, manufacturing feasibility should be evaluated before production.

Manufacturing Capabilities

Depending on the required dimensions and order quantity, the component may be made from a thick-wall quartz tube blank or machined from a solid quartz cylinder.

Available processing capabilities may include:

• Precision cutting;
• Quartz drilling;
• Inner-hole machining;
• Outside-diameter grinding;
• End-face grinding;
• Lapping;
• Optical polishing;
• Fire polishing;
• Edge chamfering;
• Ultrasonic cleaning;
• High-purity cleaning;
• Customized protective packaging.

Prototype quantities can be produced for dimensional and assembly verification before batch manufacturing.

Typical Applications

This short thick-wall quartz tube can be used in equipment requiring heat resistance, electrical insulation, chemical cleanliness, dimensional stability, or transparent observation.

Typical applications include:

• Semiconductor processing equipment;
• Quartz furnace assemblies;
• Laboratory instruments;
• High-temperature testing equipment;
• Vacuum systems;
• Gas delivery equipment;
• Analytical instruments;
• Optical equipment;
• Plasma processing systems;
• Sensor protection components;
• Electrode insulation sleeves;
• Thermocouple insulation;
• Chemical processing devices;
• Research equipment;
• Precision positioning assemblies.

For gas or liquid applications, the working pressure, flow medium, temperature, sealing structure, and connection method should be confirmed before production.

Product Advantages

Compact Geometry

The short cylindrical design is suitable for equipment with limited installation space.

Thick Quartz Wall

The substantial wall thickness provides a stable structure and allows a small axial hole to be incorporated into a relatively large quartz body.

Custom Bore Size

The through-hole diameter can be adapted for rods, wires, sensors, electrodes, optical fibers, or fluid passage requirements.

Transparent Construction

The transparent body allows visual inspection of the internal bore and inserted components.

High-Purity Material

Quartz is suitable for applications where contamination control and material cleanliness are important.

Precision Customization

Dimensions, tolerances, end surfaces, concentricity, and cleaning standards can be manufactured according to drawings.

Quality Inspection

Inspection can be performed according to the agreed technical specifications. Typical inspection items include:

• Outside diameter;
• Overall length;
• Through-hole diameter;
• Wall thickness;
• Bore position;
• Bore straightness;
• OD-to-ID concentricity;
• End-face flatness;
• End-face parallelism;
• Surface scratches;
• Edge chips;
• Visible bubbles and inclusions;
• Surface cleanliness;
• Packaging condition.

Dimensional inspection records and product photographs can be supplied when required.

Information Required for Quotation

Please provide the following information for technical evaluation and quotation:

1. Outside diameter;
2. Overall length;
3. Through-hole diameter;
4. Dimensional tolerances;
5. Concentricity requirement;
6. End-face finish;
7. Edge treatment;
8. Quartz material or purity grade;
9. Operating temperature;
10. Intended application;
11. Process gas, liquid, or chemical medium;
12. Order quantity;
13. Technical drawing or reference sample.

FAQ

Is this product a quartz tube or a quartz rod?

It is classified as a quartz tube because it contains an axial through hole. However, its thick wall and short length give it an appearance similar to a drilled quartz cylinder.

Does it have a side capillary port?

No. The component shown has a single axial through bore. It does not contain an independent side capillary port.

Can the through hole be made smaller or larger?

Yes. The hole diameter can be customized. Feasibility depends on the outside diameter, length, wall thickness, straightness, and tolerance requirements.