C/C Composite Fasteners

Name: C/C Composite Fasteners
Brand: SiC Graphite
SKU: c-c-composite-fasteners
Availability: InStock
Rating: 4.9 (24 reviews)

Carbon/Carbon composite bolts, nuts, and studs for high-temperature vacuum furnaces. Replacing brittle graphite fasteners with high-tensile-strength C/C composites to prevent catastrophic failure.

Target Buyer:Furnace OEMs and heat treatment facilities.

C/C composite bolt and fastener for high-temperature furnaces 1

Capability Highlights

Exceptional tensile strength
No brittle fracture at high temps
Thread precision

Typical Applications

Vacuum Furnaces
High-Temperature Fixtures

Engineering Focus

Thread strength
Shear strength
High-temp creep resistance

Key Evaluation Matrix

Metric	Typical Range	Why It Matters
Tensile Strength	> 150 MPa	Prevents fastener snapping during thermal cycles.
Fiber Architecture	2D or 3D C/C composite by load direction	Fiber orientation controls strength, thread retention, and long-term deformation.
Operating Atmosphere	Vacuum or inert gas; oxidation protection if required	C/C composite strength is excellent at temperature, but oxygen exposure must be managed.
Load Case	Static load, fixture spacing, and thermal-cycle count	Tray sag, bolt shear, and creep risk depend on the real support condition.

Engineering Datasheet

Product-Level Technical Specifications

Values below are RFQ planning targets, not blanket guarantees. Final acceptance criteria should be frozen against drawings, process conditions, equipment model, and buyer qualification requirements.

Parameter	Target / Typical Scope	Engineering Note
Composite architecture	2D or 3D C/C composite selected by load direction and thread geometry	Fiber architecture controls tensile strength, shear resistance, thread retention, and creep behavior.
Thread standard	Metric, imperial, or drawing-defined thread with engagement length reviewed	Thread fit should be reviewed at temperature, not only at room-temperature assembly.
Load case	Static load, shear load, preload, support spacing, and thermal-cycle count by RFQ	Fastener sizing depends on real fixture load and support geometry more than nominal thread size.
Operating temperature	Vacuum or inert high-temperature review by furnace process	C/C composite retains strength at temperature, but oxygen exposure and thermal shock still need boundaries.
Machining tolerance	Thread class, shank diameter, head geometry, length, washer interface, and chamfer by drawing	Small thread defects or sharp transitions can become failure points during repeated assembly.
Surface finish and debris control	Clean-machined threads, deburred edges, and protected contact surfaces	Carbon debris from threads can contaminate fixtures or create assembly torque errors.

Trace Impurity Review Table

Semiconductor programs should define restricted elements before sample production. The table helps procurement and process teams turn purity expectations into a measurable qualification file.

Element	Typical Limit	Why Controlled
Fiber architecture	2D / 3D route defined before quotation	Wrong architecture causes thread stripping, bolt shear, or creep under high-temperature load.
Density / open porosity	Project-defined density class and impregnation route	Density and porosity affect strength, oxidation sensitivity, and machining stability.
Oxidation exposure	Vacuum / inert baseline; coating or treatment reviewed if oxygen risk exists	C/C composite is not a substitute for atmosphere control when oxygen or water vapor is present.
Thread debris / edge chips	Visual and handling acceptance defined by buyer	Machined thread debris can interfere with torque, fixture cleanliness, and repeat assembly.

RFQ Evidence Package

These records reduce ambiguity before sample approval and repeat-order release.

Fastener drawing with thread standard, engagement length, head geometry, shank, chamfer, and mating part.
Load case with temperature, support span, preload or torque expectation, atmosphere, and cycle count.
Fiber architecture and density route tied to tensile, shear, or creep risk.
Thread visual inspection photos and dimensional checks for CTQ thread features.
Packing photos separating small fasteners, protecting threads, and labeling batches for maintenance teams.

Equipment Compatibility Review

Compatibility should be treated as an engineering review, not a catalog claim. Equipment-family language helps buyers route the RFQ, while final production still depends on drawings, samples, coating allowance, and acceptance criteria.

Equipment Family	Compatible Part Scope	Buyer Validation Required
High-temperature vacuum furnace fixtures	C/C bolts, nuts, studs, washers, threaded rods, retainers, and support fasteners.	Confirm thread standard, load at temperature, preload method, support span, atmosphere, and cycle count.
Heat treatment and sintering fixtures	Load-bearing fasteners and fixture retainers replacing brittle graphite or heavy refractory metal hardware.	Confirm tray load, thermal cycle, handling frequency, required torque, and failure mode of current hardware.
Semiconductor and crystal-growth hot zones	Lightweight C/C fasteners, supports, and retainers for thermal-field assemblies.	Confirm contamination sensitivity, ash target if needed, mating graphite parts, and clean packing route.

Open full OEM compatibility matrix

Product Selection Logic

Decision Factor	Selection Logic	Buyer Check
Load at temperature	Choose C/C composite when graphite is too brittle or molybdenum adds too much thermal mass.	Provide load, support spacing, furnace temperature, and cycle count.
Fiber architecture	2D C/C can fit plates and trays; 3D architecture is preferred for multi-directional stress and threads.	Clarify bending direction, thread engagement, and any fastener preload.
Oxidation boundary	C/C composite is strongest in vacuum or inert environments; oxygen exposure needs protection.	Share atmosphere, leak risk, cleaning practice, and cooldown handling.

Manufacturing and QC Flow

Stage	Production / QC Checkpoint	Buyer Evidence
1. Load-case review	Define temperature, support spacing, fastener preload, tray load, and cycle count.	Application sketch, fixture drawing, load estimate, and atmosphere notes.
2. Fiber architecture	Choose 2D or 3D C/C blank according to bending, shear, and thread loads.	Material route with density and architecture recommendation.
3. Densification and machining	Process C/C blank, then machine threads, holes, plates, and tray geometry.	Dimensional report for load-bearing and assembly-critical features.
4. Strength-risk check	Review delamination, thread stripping, sag, and edge damage before shipping.	Visual inspection plus agreed mechanical evidence if required.
5. Handling and packing	Prevent abrasion and impact on lightweight C/C fixtures during export.	Packing photos and handling notes for furnace maintenance teams.

RFQ Checklist

Thread size (e.g., M8, M10, M12)
Length required
Quantity

Risk Controls

Thread stripping: Specialized CNC thread milling on 2D/3D C/C composite blanks.

Product Gallery

C/C composite bolt and fastener for high-temperature furnaces 2

C/C composite bolt and fastener for high-temperature furnaces 3

C/C composite bolt and fastener for high-temperature furnaces 4

C/C composite bolt and fastener for high-temperature furnaces 5

C/C composite bolt and fastener for high-temperature furnaces 6

C/C composite bolt and fastener for high-temperature furnaces 7

C/C composite bolt and fastener for high-temperature furnaces 8

Carbon carbon composite threaded fastener 1

Carbon carbon composite threaded fastener 2

Carbon carbon composite threaded fastener 3

Buyer FAQ

Do C/C bolts fuse to C/C nuts at high temperatures?

We ensure proper thread clearance and material matching to minimize binding.

When is C/C composite a better choice than graphite?

Choose C/C composite when the part carries load, sees repeated thermal shock, needs threaded strength, or fails because graphite is too brittle.

What information is needed for C/C tray or fastener design?

Provide load, support spacing, maximum temperature, atmosphere, cycle count, thread standard, and the current failure mode if replacing another material.

Can C/C composite be used in oxidizing atmospheres?

C/C composite performs best in vacuum or inert gas. If oxygen exposure is expected, the application needs oxidation-risk review and possible protective treatment.

Related Resources

Procurement Next Steps

Compare the full product portfolio before locking material architecture.
Match the part to a process solution for thermal-field and contamination constraints.
Review OEM capability controls for machining, coating, purification, and export packaging.
Send a drawing-based RFQ with process, material grade, tolerances, quantity, and delivery target.

Inquiry Email

[email protected]

Email app

Include process, product type, drawing status, purity/coating target, dimensions, quantity forecast, operating conditions, and delivery date.

Instant Chat

+8618857971991

Chat on WhatsApp

Best for quick drawing checks, process fit questions, and RFQ clarification.