Carbon Carbon Nuts

JUN TENG's Carbon Carbon Nuts are precision-engineered companions to our C/C bolts and screws — designed for the same 2000°C+ inert atmospheres and high-purity requirements. Unlike graphite nuts that crack under thermal cycling or molybdenum nuts that soften and lose preload at high temperatures, our nuts are formed from 3D interwoven carbon fiber preforms and densified through 4 cycles of CVD — not cut from carbon sheet.

Product Core Parameters Table+Material Competitor Comparison Table

Table 1 JUNTENG Carbon Nut Standard Technical Parameters

Table 2 Comprehensive Comparison of Junteng Carbon Nut vs. Graphite Nut vs. Molybdenum Alloy Nut

Complete integrated production process flow

Most Carbon Carbon Nuts on the market are directly cut from carbon carbon sheets and turned into shapes, with many internal layered pores and poor strength; Junteng adopts 6 closed-loop precision processes for integrated molding, with segmented quality inspection throughout the entire process, to improve the overall strength of the nut from the source:

1. High purity 3D prefabricated body weaving: using brand new 12K PAN carbon fiber, 3D interlocking integrated weaving forming, uniform stress on the body, and preventing thread delamination and fracture in the later stage;

2.450℃constant temperature pre oxidation shaping: eliminates fiber internal stress caused by weaving, prevents densification and deformation of the billet during high-temperature processing, and stabilizes the processing size benchmark;

3. Multi cycle CVD gas-phase densification core process: 4 cycles of pyrolytic carbon deposition to fill the internal pores of the billet, significantly improving the overall density and interlayer bonding force, and significantly improving the thread bite wear resistance;

4.2400℃ultra-high temperature graphitization purification: removes impurities inside the billet, improves the purity of the carbon matrix, reduces impurity precipitation under high temperature conditions, and adapts to high-purity semiconductor production environments;

5. Five axis CNC integrated precision turning: using composite material special cutting tools to process internal threads and flange end faces, the tooth profile is complete without burrs or broken edges, and the matching degree with our factory's carbon bolts is 100%;

6. Customized treatment of SiC anti-oxidation coating: For intermittent aerobic door opening conditions, a dense silicon carbide protective layer is sprayed on the surface to significantly increase the anti-oxidation usage temperature. Before leaving the factory, each batch of carbon nuts is randomly sampled for tensile testing, cold and hot impact testing, and thread wear resistance testing. Any non-conforming products are reworked and scrapped, and will never be included in wholesale and bulk orders.

Seven core product advantages+solutions to customer procurement pain points

Based on years of consulting data from high-temperature equipment manufacturers, accurately match customer selection pain points, and output targeted solutions:

1. One piece molding with high strength solves the problem of high-temperature sliding and cracking. Graphite nuts are extremely fragile due to cold and hot cycles, and metal molybdenum nuts soften and lose their tightness at high temperatures. The mechanical properties of Junteng 3D solid body structure are stable, with extremely low thermal expansion coefficient. It is firmly fastened in an inert environment at 2000℃for a long time without loosening, greatly reducing the frequency of equipment shutdown and re tightening.

2. High purity without metal precipitation, eliminating workpiece pollution. The all carbon composite material does not contain any metal elements and has an extremely low ash content. It is used in photovoltaic silicon wafer sintering and semiconductor wafer annealing furnaces, and does not produce heavy metal impurities that contaminate products, steadily improving workpiece production yield.

3. Factory Direct is directly operated by the factory, with sufficient stock and outstanding cost-effectiveness. It has its own complete full industry chain production line, without intermediaries raising prices layer by layer. Standard specifications are in stock all year round and can be shipped quickly within 48 hours; Long term wholesale discounts can be enjoyed for bulk order purchases, and carbon bolts and gaskets can be purchased in one stop.

4. Full specification flexible customization, suitable for various non-standard high-temperature furnaces, supports customized inner diameter, thickness, flange outer diameter, and thickened load-bearing styles, and can be used for high-purity purification treatment and SiC anti-oxidation coating; Small batch experimental samples and non-standard accessories for large-scale production furnaces can be produced without strict minimum order quantity restrictions.

5. Lightweight and weight reducing design reduces equipment energy consumption by only one sixth of molybdenum alloy and one fourth of steel. Large scale assembly can reduce the load-bearing capacity of furnace insulation components and carbon carbon plates, reduce equipment heating energy consumption, and extend the service life of the entire set of thermal field accessories.

6. Free sample testing to avoid quality risks in large-scale procurement. New customers can apply for the Free Sample set of nuts and bolts. The raw materials, dense process, and thread processing standards of the samples are completely consistent with those of bulk orders, and support third-party tensile and thermal shock performance testing. After actual testing meets the standards, bulk purchases can be made.

7. The full set of bidding qualifications is complete, and the equipment acceptance is worry free. We can provide a complete self inspection report from the original factory, ISO9001 system certification, CE export qualification, and high-temperature carbon carbon composite material industry access certificate. The bidding for photovoltaic, semiconductor, and aerospace projects can directly use the full set of materials without additional repeated testing.

Common application scenarios

1. Application of photovoltaic new energy thermal field equipment: Carbon carbon insulation cylinder and supporting fastening nut for single crystal furnace, polycrystalline silicon reduction furnace, silicon wafer sintering furnace, no metal pollution, ensuring silicon wafer purity, long-term bulk procurement by leading domestic photovoltaic equipment manufacturers.

2. Application of semiconductor wafer manufacturing equipment: wafer annealing furnace, ion implantation equipment, CVD reaction chamber internal fastener matching nuts, high-purity and low precipitation, suitable for vacuum plasma corrosion conditions, without damaging the chip substrate.

3. Application of powder metallurgy and hard alloy sintering furnace: Alloy sintering push plate, vacuum bell cover furnace high-temperature fixture matching nut, excellent resistance to cold and hot impact, avoiding frequent nut breakage and production line shutdown losses.

4. Application of Aerospace High Temperature Thermal Protection Test Fixture: As a supporting connector for aircraft thermal protection test pieces and engine high temperature simulation fixtures, it is lightweight, resistant to 2000℃high temperature erosion, and meets the rigorous high temperature testing standards of aerospace.

5. Application of laboratory research small high-temperature equipment: supporting nuts for tube furnaces and small vacuum sintering test benches, supporting customized micro non-standard sizes, and quickly scheduling and delivering small batch sample orders.

Authoritative qualification certification

1. ISO9001 international quality management system full process standardization certification;

2. Third party comprehensive mechanical and thermal testing reports from the National Non Metallic Composite Materials Testing Center;

3. High temperature carbon composite material industry access qualification, designated supplier qualification for domestic photovoltaic and semiconductor head equipment manufacturers;

4. Export CE certification. As a professional exporter of carbon nuts, we can provide certificates of origin and a complete set of foreign trade customs clearance documents;

5. Self built material testing laboratory registration certificate, all testing data can be traced throughout the process, supporting customers to randomly sample on-site testing at the factory.

Q&A

Q1: Should bare materials or SiC coated carbon carbon nuts be selected for photovoltaic and semiconductor operating conditions?  

A1: Using standard bare materials for continuous inert environments with nitrogen, argon, and vacuum throughout the process, resulting in lower procurement costs; The equipment frequently opens doors for air intake and operates under intermittent aerobic conditions, requiring customized SiC anti-oxidation coating with an anti-oxidation resistance temperature increased to 1600℃.  

Q2: Can non-standard special thicknesses and flange sizes be customized, and what is the minimum order quantity?  

A2: There is no minimum order quantity for standard spot specifications, and one set of nuts and bolts can be purchased; Minimum order quantity for customized products with non-standard thickness, special flanges, and oversized/mini inner diameters is 10 sets. OEM OEM packaging services can be negotiated.  

Q3: What are the long-term advantages of Carbon Carbon Nuts compared to graphite nuts?  

A3: Under the same operating temperature and frequency of cold and hot cycles, the service life of Junteng integrated dense carbon nuts is 3-5 times that of ordinary graphite nuts, significantly reducing the frequency of consumable replacement and downtime for maintenance, and lowering long-term comprehensive operating costs.  

Q4: Can I apply for sample testing before purchasing? Is the sample quality consistent with the bulk order?  

A4: All new customers can apply for Free Sample, which is processed uniformly from mass-produced prefabricated bodies. The raw materials, densification process, and thread processing standards are completely consistent with Bulk Order bulk orders, and customers can submit them to third-party organizations for performance verification.

Transaction protection and full cycle after-sales service

1. On site factory inspection and testing guarantee: Domestic and foreign buyers can visit Junteng's production workshop, CVD dense furnace, CNC precision machining area, and testing laboratory at any time to randomly select finished nuts for tensile and thermal shock testing; The measured indicators do not match the official report. A full refund will be issued and all round-trip logistics costs will be borne.

2. Fast delivery guarantee for spot goods: Within 48 hours after confirming the stock standard specification order, it will be shipped out of the warehouse; Sign a formal purchase and sales contract for customized processing orders, specify the delivery period, and pay corresponding order liquidated damages for overdue payments.

3. Legitimate contract and invoice guarantee: All bulk order orders are signed with standardized purchase and sales contracts, and value-added tax special invoices are issued through public to public transfers; Foreign trade export orders are accompanied by certificates of origin, CE certification, packing lists, and a complete set of customs clearance documents.

4. Quality compensation guarantee: Sampling and testing of goods within 7 days of receipt. If the density, interlayer strength, and thread accuracy do not meet the agreed technical indicators, unconditional returns and exchanges are supported, and all round-trip logistics costs are borne by Junteng factory.

5. One on one professional technical after-sales service: Composite material professional engineers provide free guidance on the entire process of working condition selection, assembly torque, furnace heating process, nut installation and maintenance; For large-scale photovoltaic and semiconductor production line projects, engineers can be arranged to provide on-site technical support.

6. Exclusive long-term cooperation discounts: Customers who purchase wholesale products at designated locations throughout the year can enjoy annual bulk purchase discounts, priority production scheduling, and regular free product performance retesting services.

Why choose us?

JUNTENG has been deeply involved in high-temperature carbon carbon composite materials for 18 years. It is a professional factory direct manufacturer and exporter of Carbon Carbon Nuts, integrating research and development, weaving, densification processing, and precision CNC machining. It is equipped with a complete set of fastener production lines for carbon carbon bolts, screws, and washers.

The factory has established an independent material mechanics and thermal testing laboratory, and all Carbon Carbon Nuts are produced in accordance with the national standard GB/T 39852. Each batch comes with a third-party authoritative testing report, ISO9001 quality system, and CE export full set of qualifications. Standard specifications such as M8/M10/M12/M16/M20 are available in stock for direct delivery all year round. Customization of inner diameter, thickness, flange size, and SiC anti-oxidation coating is supported. New customers can apply for Free Sample sample testing.

Different from the simple turning of thin-walled carbon nuts on the market, Junteng adopts a three-dimensional prefabricated body that is densely formed, with high thread engagement strength and low risk of cracking and slipping at high temperatures. It provides a one-stop solution to the problem of fastening and matching high-temperature furnaces in photovoltaics, semiconductors, and powder metallurgy.