HZ-JDB graphite copper sleeve Manufacturers

HZ-JDB Graphite Copper Sleeve: Maintenance-Free Copper Alloy Bushings

Zhejiang Huazhou Technology Co., Ltd. manufactures the HZ-JDB graphite copper sleeve family — copper alloy bushings with embedded solid graphite lubricant that run without oiling in high-load, intermittent and oscillating motion. We produce these as a China HZ-JDB graphite copper sleeve manufacturer from our Nanxun, Huzhou plant, supplying standard metric sizes and custom configurations for automotive production lines, water-control gates, plastic machinery, punch-press peripherals, turbines and similar equipment.

The range covers straight sleeves, flanged sleeves and high-hardness graphite sliders. Each variant uses the same working principle: graphite plugs distributed through a bronze or brass matrix deposit a transfer film onto the shaft, so the bearing maintains a low friction coefficient even when grease or oil cannot be replenished.

Our HZ-JDB Range and Where Each Type Fits

We supply three product types under the HZ-JDB graphite copper sleeve category. Selection depends on load direction, housing design and whether the application needs axial location or a sliding interface.

For applications that also need a lubricated metal interface, our HZ-090 single metal copper sleeve and HZ-800 bimetal composite bearing cover oil-groove and steel-backed options within the same plant.

Material Grades and Working Limits

We machine HZ-JDB bushings from several copper alloy grades so the bearing can be matched to load, temperature and lubrication condition. The table below summarizes the main technical indices we work to when preparing a proposal.

JDB-1 is our general-purpose grade for mixed dry and oiled duty, including water exposure. JDB-2 suits low-load, high-temperature positions. JDB-3 saves cost by combining a steel backing with a bronze lining. JDB-4 replaces JDB-2 where mechanical demands are lower. JDB-5 is the fortified grade for heavy hoisting supports, but its steel matrix is not intended for water, acid or alkali contact.

Sizes, Tolerances and Configuration Options

Straight HZ-JDB sleeves are produced in standard metric sizes from 8 mm to 150 mm bore, with additional sizes available on request. Flanged HZ-JFB sleeves run from 10 mm to 120 mm bore with flange diameters matched to the housing shoulder. HZ-JSP graphite sliders are supplied in widths from 28 mm to 150 mm and lengths from 75 mm to 350 mm.

• Bore tolerance: F7 for straight sleeves, with flanged variants held to the same fit class.
• Outside diameter: m6 for press-fit into a machined housing.
• Length tolerance: −0.30 to −0.10 mm on standard straight sleeves.
• Graphite plug pattern: standard distribution or adjusted for load zone and motion type.
• Flange options: plain flange, chamfered flange, or flange with mounting holes.
• Surface finish: machined bore and OD, with optional oil grooves or lubrication holes.

We also produce related self-lubricating products such as HZ-10 self-lubricating bearings and HZ-20 boundary lubricated bearings when a project needs a mix of bearing types from one supplier.

Application Fit and Process Conditions

HZ-JDB graphite copper sleeves are used where lubrication intervals cannot be maintained reliably. The embedded graphite provides a continuous solid lubricant film, so the bearing keeps working in dusty, dry or high-heat conditions. Typical positions include automotive and locomotive production lines, turbine linkages, reservoir working and accident doors, plastic machinery, punch-press peripherals, and construction machine pivots.

For high-load, intermittent or oscillating motion, the copper alloy matrix carries the compressive load while the graphite reduces friction at the contact surface. Copper's thermal conductivity helps dissipate heat generated at the bearing interface, which supports stable operation in continuous-duty equipment.

Quality Control and Acceptance

Our plant operates under a quality management system and holds IATF16949 certification for automotive supply. We inspect incoming copper alloy, control graphite plug placement, and check bore, OD and length against the drawing before packing. For project orders, we can supply dimensional inspection records and material certificates with the shipment.

Acceptance testing typically covers fit, surface condition, graphite distribution and, where required, a run-in check on a sample basis. We agree the inspection plan with the customer before production so the delivered bushings match the drawing and the working conditions.

Information We Use to Configure Your Solution

To prepare a suitable HZ-JDB graphite copper sleeve proposal, we need the following project inputs. The more complete the data, the more precisely we can match grade, size and graphite pattern.

• Shaft diameter and housing bore, with tolerance class.
• Radial load, axial load and direction of motion (rotating, oscillating or linear).
• Operating temperature range and ambient conditions (dust, water, chemicals).
• Speed and duty cycle, including start-stop frequency.
• Lubrication condition: dry, oiled, grease or water-lubricated.
• Sleeve length, flange requirement and any mounting constraints.
• Annual quantity and delivery schedule.
• Drawing or sample, if a custom profile is needed.

Send these details through our product inquiry and we will confirm the recommended grade, dimensions and graphite layout. Samples are produced in 3 days, and our daily output reaches 500,000 pieces across the self-lubricating bearing lines.

Installation, Maintenance and Serviceability

HZ-JDB bushings are installed by press fit into a machined housing. The m6 outside diameter and F7 bore create the interference needed to hold the sleeve without additional fasteners. For flanged types, the flange seats against the housing face and prevents axial movement. We recommend a lead-in chamfer on the housing bore to avoid damaging the graphite plugs during assembly.

Once installed, the bearing needs no routine greasing. Maintenance checks focus on wear depth, shaft surface condition and any sign of overheating. Because the graphite film is self-renewing, the bushing continues to operate even if the initial lubricant film is disturbed. Replacement follows the same press-fit procedure, and we supply spare bushings to the original drawing.

Frequently Asked Questions

What is the difference between HZ-JDB and HZ-JFB?

HZ-JDB is a straight cylindrical sleeve for radial loads. HZ-JFB adds an integrated flange that locates the bearing axially and distributes load over a larger housing area. Both use the same copper-graphite self-lubricating principle.

Can HZ-JDB bushings run completely dry?

Yes. The embedded graphite provides solid lubrication, so the bearing operates without oil or grease. Dry running is common in dusty, high-temperature or inaccessible positions where lubrication would be impractical.

Which grade should I choose for high load and high temperature?

JDB-1 handles general high-load duty up to 100 N/mm² and 300 °C. JDB-5 supports up to 250 N/mm² for heavy hoisting supports but is not for water, acid or alkali. JDB-2 and JDB-4 cover lower-load, high-temperature positions.

Do you produce custom sizes and graphite patterns?

We machine custom bores, lengths, flanges and graphite distributions from customer drawings. Standard metric sizes cover 8–150 mm bore for straight sleeves and 10–120 mm for flanged types, with additional sizes available on request.

What information do you need for a quotation?

Shaft and housing dimensions, load, speed, temperature, lubrication condition, quantity and delivery schedule. A drawing or sample helps us confirm the exact configuration. We reply to inquiries within 12 hours of the working day.

How are the bushings packed and delivered?

Bushings are packed to protect the machined surfaces and graphite plugs during transport. We confirm packaging, labeling and delivery scope with the order, and can include inspection records and material certificates for project shipments.