Graphite Bushing And Graphite Bearing For High Temperature Applications

Graphite Bushing and Graphite Bearing for High Temperature Applications

Product Overview

Our graphite bushings and bearings are self-lubricating, maintenance-free solid bearings designed for high-temperature, corrosive, or hard-to-lubricate operating environments. Unlike oil-lubricated bronze or steel bearings that fail above 300°C, graphite bearings operate reliably at temperatures up to 400°C in air and 2000°C+ in vacuum or inert gas. They require no external lubrication, do not contaminate food or pharmaceutical processes, and resist chemical attack from most acids and alkalis. We manufacture standard and custom graphite bushings, thrust washers, and wear plates for furnace conveyors, kiln cars, ovens, and chemical processing equipment.

Self-lubricating graphite bearings are the preferred solution for applications where oil or grease cannot be used: high-temperature oven chains, food baking equipment, chemical pump bearings, and vacuum furnace mechanisms. At Jincheng Graphite, we precision-bore and turn graphite bushings to standard shaft tolerances, with custom sizes available on request. Each bushing is machined from dense, fine-grain graphite that provides smooth, low-friction operation without external lubricants.

Key Features

• Self-lubricating - no oil, grease, or external lubrication required
• Extreme temperature range - -200°C to 400°C in air, higher in vacuum
• Corrosion resistant - resistant to most acids, alkalis, and chemicals
• No contamination - safe for food, pharmaceutical, and clean environments
• Precision bored - standard shaft fits (H7, H8) for easy installation
• Low friction coefficient - 0.1 - 0.2 dry friction without lubricants
• Lightweight - 1/5 the density of steel for reduced moving mass
• Custom sizes - standard and custom bore, OD, and length combinations

Technical Specifications

Applications

• Oven and furnace conveyors - bearing bushings for high-temperature chain systems
• Food baking equipment - lubrication-free bearings for ovens and proofers
• Chemical pumps - shaft bushings for corrosive fluid handling
• Kiln cars and furnace cars - wheel bearings for ceramic kiln furniture
• Vacuum furnace mechanisms - internal bearings that cannot be lubricated
• Textile and packaging machinery - contamination-free bearings for food-contact processing

Why Choose Jincheng Graphite?

• Precision boring - bushings bored to standard shaft tolerances
• Fine-grain material - smooth-running graphite for long bearing life
• Standard and custom sizes - common sizes in stock, custom on request
• Material selection - recommend grade based on temperature and chemical environment
• Fast delivery - standard bushings ship within 5-7 business days
• Cost effective - lower cost than proprietary self-lubricating bearing materials
• Technical support - we help select the right bushing for your load and speed
• Global supply - industrial bearing customers in 25+ countries

FAQ

Q: How does graphite work as a bearing material without lubrication?
A: Graphite has a layered crystal structure that allows planes to slide easily over one another, providing natural self-lubrication. In dry operation, graphite transfers a thin film onto the mating shaft surface, creating a smooth, low-friction interface. This is why graphite bearings work without oil or grease.

Q: What shaft material works best with graphite bushings?
A: Hardened steel, stainless steel, or ceramic shafts provide the longest bushing life. Soft or rough shaft surfaces accelerate wear. We recommend a shaft surface finish of Ra 0.8 or better for optimal bushing performance.

Q: Can graphite bearings run at high speed?
A: Graphite bearings are best suited for low to moderate surface speeds (up to approximately 1 m/s) and moderate loads. For high-speed or high-load applications, we recommend evaluating the specific operating conditions and may suggest an alternative graphite grade or a graphite/metal composite.

Q: What is the maximum load for a graphite bushing?
A: Load capacity depends on bushing dimensions and material grade. As a general guide, a standard 20 mm bore bushing can support 5-10 MPa bearing pressure at room temperature. Tell us your shaft diameter, load, and speed, and we will recommend the right bushing size.