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Home / Product / JDB Solid-lubricating Bearing / JDB650 Self-Lubricating Brass Bushing Oilless Bearings
Wholesale JDB650 Self-Lubricating Brass Bushing Oilless Bearings
JDB650 Self-Lubricating Brass Bushing Oilless Bearings
  • JDB650 Self-Lubricating Brass Bushing Oilless Bearings
  • JDB650 Self-Lubricating Brass Bushing Oilless Bearings
  • JDB650 Self-Lubricating Brass Bushing Oilless Bearings

JDB650 Self-Lubricating Brass Bushing Oilless Bearings

Product Description:

JDB650 self-lubricating brass bushing oil-free bearings are made of advanced self-lubricating materials and embedded with special solid lubricants. They can operate stably for a long time without external lubrication, reducing maintenance costs and downtime. The product has wear resistance, corrosion resistance and pressure resistance, and is suitable for a variety of demanding industrial applications such as mechanical equipment, automotive parts and automation devices. JDB650 oil-free bearings have performance in high load, low speed and medium to high temperature environments.

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JDB650 Self-Lubricating Brass Bushing Oilless Bearings

Solid Lubricant Embedded Maintenance Free Bearing for Industrial Applications

Product Overview

The JDB650 self-lubricating brass bushing is a composite oilless bearing engineered for applications requiring high load capacity, corrosion resistance, and reduced maintenance intervals. The base material consists of high-strength CuZn24Al6 brass alloy, into which solid graphite lubricant inserts are mechanically embedded at 45-degree or 90-degree patterns across the sliding surface. During operation, the lubricant transfers to the mating shaft surface, forming a continuous low-friction film. This design eliminates the need for external grease or oil systems, making the JDB650 suitable for hard-to-access locations, oscillating movements, and environments where lubricant contamination must be avoided.

Product Characteristics

  • Friction coefficient: 0.06 - 0.16 depending on load and surface finish
  • Maximum sliding speed: 0.5 m/s for continuous operation; 1.0 m/s intermittent
  • Maximum PV value: 3.0 N/mm²·m/s with grease lubrication; 1.5 N/mm²·m/s dry condition
  • Wear rate: less than or equal to 0.06 mm per 100 km under standard test conditions at 80 N/mm² and 0.2 m/s
  • Thermal expansion coefficient: 18 times 10 to the power of minus 6 per Kelvin from 20°C to 200°C range
  • Dimensional availability: ISO 3547 standard series and inch series from 1/4 inch to 8 inches inner diameter
  • Manufacturing tolerance for inner diameter: H8 ISO 286-2 standard; H7 or H9 available on request

Material Composition

Base Material CuZn24Al6 CW307G brass alloy DIN EN 1982 compliant
Lubricant Type Graphite and MoS₂ composite Solid lubricant inserts
Lubricant Coverage 20 to 25 percent of sliding surface area Evenly distributed pattern
Substrate Hardness 160 to 220 HB Brinell hardness scale

Technical Specifications

Mechanical Properties Tensile strength of 600 N/mm² minimum | Yield strength of 300 N/mm² minimum | Elongation of 12 percent minimum
Thermal Properties Thermal conductivity of 58 W per m per K | Specific heat capacity of 380 J per kg per K
Electrical Properties Electrical conductivity of 12 percent IACS | Not recommended for electrical contact applications
Physical Properties Density of 7.8 grams per cubic centimeter | Porosity less than 1 percent non porous structure

Core Advantages

Eliminates External Lubrication
Solid graphite inserts provide continuous lubrication during operation. No grease fittings, oil lines, or scheduled relubrication required.
High Load Capacity
Supports static loads up to 250 N per mm² and dynamic loads up to 120 N per mm². Suitable for heavy duty industrial machinery.
Corrosion Resistance
Brass substrate resists oxidation in humid environments, marine atmospheres, and contact with mild chemicals or water.
Wide Temperature Range
Operates continuously from negative 40 degrees Celsius to positive 200 degrees Celsius. Short term excursions up to 250 degrees Celsius are permissible under reduced load.

Application Scenarios by Industry

Agricultural Machinery
  • Combine harvester threshing mechanisms
  • Tractor linkage pivot points
  • Balers and forage harvesters
  • Seed drill metering systems
Construction Equipment
  • Excavator arm pivot joints
  • Loader bucket hinge points
  • Bulldozer blade linkages
  • Crane boom support bearings
Industrial Machinery
  • Hydraulic cylinder pin joints
  • Packaging machine intermittent motion
  • Textile machinery oscillation points
  • Printing press roller supports
Automotive Applications
  • Steering system linkages
  • Suspension control arm bushings
  • Brake pedal pivot mechanisms
  • Trailer hitch articulation points
Marine Equipment
  • Deck crane slewing bearings
  • Rudder hinge bushings
  • Winch drum support bearings
  • Davit rotation mechanisms
Material Handling
  • Conveyor belt tensioning pulleys
  • Palletizer arm joints
  • Automated storage and retrieval system pivots
  • Lift table scissor mechanisms

Frequently Asked Questions

Q1: Can the JDB650 operate without any initial lubrication
Yes. The solid graphite inserts provide immediate lubrication upon startup. No initial grease or oil application is required, though applying assembly paste during installation can reduce initial break in wear.
Q2: What is the recommended shaft material and surface finish
Hardened carbon steel with hardness of 45 to 55 HRC and surface roughness Ra of 0.2 to 0.4 micrometers. Chromium plated or stainless steel shafts may increase wear rates. Shaft hardness below 40 HRC is not recommended for loads exceeding 60 N per mm².
Q3: What causes increased friction or premature wear
Common causes include surface pressure exceeding 120 N per mm² dynamic limit, sliding speed above 0.5 meters per second continuous, operating temperature beyond 200 degrees Celsius, shaft roughness outside Ra 0.2 to 0.8 micrometer range, or abrasive contamination entering the bearing interface.

Installation Precautions

  • Press fit using tools contacting bearing outer ring only. Never apply force to the sliding surface or lubricant inserts.
  • Housing bore tolerance: ISO H7 standard with surface roughness Ra less than or equal to 1.6 micrometers. Chamfer edges at 0.5 to 1.0 millimeters with 15 to 20 degree angle.
  • Do not machine or ream the inner diameter after manufacturing. This disrupts lubricant distribution pattern.
  • For interference fit applications with tolerance class H7 slash p6 or H7 slash r6, verify inner diameter reduction does not exceed 0.05 millimeters after assembly.
  • Maximum angular misalignment during operation: 0.5 degrees. Larger misalignment causes edge loading and accelerated wear.
  • Clean housing bore before installation. Debris embedded into sliding surface acts as abrasive particles.

Dimensional Availability

Metric Series in mm Inner Diameter Range Outer Diameter Range Length Range Standard Tolerance
Standard metric 10 to 200 14 to 220 10 to 200 Inner Diameter H8 / Outer Diameter h8
Thin wall series 15 to 150 17 to 156 10 to 150 Inner Diameter H9 / Outer Diameter f7
Heavy wall series 12 to 180 20 to 220 12 to 180 Inner Diameter H7 / Outer Diameter p6
Inch Series in inches Inner Diameter Range Outer Diameter Range Length Range Standard Tolerance
Standard inch 0.250 to 8.000 0.375 to 8.500 0.250 to 6.000 Inner Diameter plus 0.001 minus 0.000

Custom dimensions, non standard wall thicknesses, and flanged configurations available. Minimum order quantities apply for non standard sizes.

Operating Limits Comparison

Parameter JDB650 Standard With External Grease
Maximum static load in N per mm² 250 250
Maximum dynamic load in N per mm² 120 140
Maximum sliding speed in meters per second 0.5 1.0
Maximum PV value in N per mm² times meters per second 1.5 3.0
Friction coefficient range 0.06 to 0.16 0.04 to 0.10

Environmental Compatibility

  • Water immersion: Suitable for fresh and salt water exposure. Lubrication film maintained. Avoid continuous high speed operation underwater.
  • Chemical resistance: Resists mild acids with pH 5 to 7, alkalis with pH 7 to 9, hydrocarbons, and solvents. Not recommended for strong oxidizing acids.
  • Vacuum applications: Suitable for high vacuum up to 10 to the power of negative 6 mbar. Graphite lubrication does not outgas. No liquid lubricant evaporation concerns.
  • Dusty environments: Use with shaft seals or wipers when abrasive particles such as sand, cement, or mineral dust are present.
  • Food contact: Not certified for direct food contact. Graphite lubricant does not meet FDA requirements for food processing equipment.

Inner diameter F7
I.D.фd		 Outer diameter m6
O.D.фD		 L -0.1
   -0.3		 I.D.After Press-Fitting JTW I.D.фd
8 10 12 15 16 19 20 25 30 35 40 50 60 70 80
6 +0.022
+0.010		 10 0.021 061008 061010 061012 +0.019
+0.007		 一 6
8 +0.028
+0.013		 12 +0.018
+0.007		 081208 081210 081212 081215 +0.025
+0.010		 一 8
10 14 101408 101410 101412 101415 101420 10 10
12 +0.034
+0.016		 18 121808 121810 121812 121815 121816 121819 121820 121825 121830 +0.031
+0.013		 12 12
13 19 +0.021
+0.008		 131910 131912 131915 131920 131925 131930 13 13
14 20 142010 142012 142015 142020 142025 142030 +0.030
+0.012		 14 14
15 21 152110 152112 152115 152116 152120 152125 152130 152135 152140 15 15
16 22 162210 162212 162215 162216 162219 162220 162225 162230 162235 162240 16 16
17 23 172315 18 17
18 24 182410 182412 182415 182416 182420 182425 182430 182435 182440 18 18
19 +0.041
+0.020		 26 192615 20 19
20 28 202810 202812 202815 202816 202819 202820 202825 202830 202835 202840 202850 20 20
20 30 203010 203012 203015 203016 203020 203025 203030 203035 203040 203050 20 20
22 32 +0.025
+0.009		 223212 223215 223220 223225 25 22
25 33 253312 253315 253316 253320 253325 253330 253335 253340 253350 253360 25 25
25 35 253512 253515 253516 253520 253525 253530 253535 253540 253550 253560 25 25
28 38 283820 283825 283830 283840 30 28
30 303812 303815 303820 303825 303830 303835 303840 303850 303860 30 30
30 40 304012 304015 304020 304025 304030 304035 304040 304050 304060 30 30
32 42 324420 324230 324240 35 32
35 44 354420 354425 354430 354435 354440 354450 354460 35 35
35 45 354520 354525 354530 354535 354540 354550 354560 35 35
38 48 384840 40 38
40 50 405015 405020 405025 405030 405035 405040 405050 405060 405070 405080 40 40
40 55 +0.030
+0.011		 405515 405530 405535 405540 405550 405560 +0.045
+0.020		 40 40
45 455530 455535 455540 455550 455560 45 45
45 56 455630 455635 455640 455650 455660 45 45
45 456030 456035 456040 456050 456060 456070 456080 45 45
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Zhejiang Shuangnuo Bearing Technology Co., Ltd.
Zhejiang Shuangnuo Bearing Technology Co., Ltd.
Zhejiang Shuangnuo Bearing Technology Co., Ltd. is China JDB650 Self-Lubricating Brass Bushing Oilless Bearings Suppliers and Wholesale JDB650 Self-Lubricating Brass Bushing Oilless Bearings Company, we are a manufacturer specializing in producing various self-lubricating copper alloy products using centrifugal casting, continuous casting, metal mold casting, and other processes. Its main products include brass, aluminum bronze, tin bronze, and others produced according to national standard grades. It processes and produces various solid inlaid self-lubricating bearing products on this basis . At the same time, it uses sintering technology to produce bimetallic products and many other types of products. Since its establishment nearly 10 years ago, the company has focused on the research development, and production of various new self-lubricating bearings.

In the process of product production, our company has always insisted on independent casting production of raw materials to ensure the quality of products from the source; during the casting process, the whole process is monitored, and the finished product is tested by spectrometer three times before, in and after the furnace to confirm the material composition of the product. The national testing agency is regularly commissioned to test the material composition and mechanical properties of the product, and authoritative test reports can be provided to customers in need; the company implements integrated production from material to finished product processing and has more than 80 sets of advanced CNC machine tools, CNC lathes, machining centers, and other major equipment. The strong production capacity ensures that the material production is organized for customers for the first time, shortening the production cycle.
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    Founded in 2014, Shuangnuo has 10 years of experience in the industry.

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    Strong production capacity ensures that we can organize material production for customers as soon as possible and shorten the production cycle.

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    There are more than 5,000 cooperative customers around the world.

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