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Wholesale Flanged Graphite Plugged Bronze Bushing, Self Lubricating Oilless Bronze Sleeve Bearing GB71 NAAMS

Flanged Graphite Plugged Bronze Bushing, Self Lubricating Oilless Bronze Sleeve Bearing GB71 NAAMS

Product Description:

This flanged graphite plugged bronze bushing is made of high-strength bronze alloy with embedded solid graphite plugs as solid lubricant. The flange design provides axial positioning for easy installation. It works continuously without oil or grease supply, suitable for high-load, low-speed swing and reciprocating motion. Widely used for injection molds, construction machinery, automotive equipment, hydraulic facilities and textile machines.

GB71 | NAAMS Standard

Flanged Graphite Plugged Bronze Bushing, Self Lubricating Oilless Bronze Sleeve Bearing GB71 NAAMS

NAAMS Compliant Flanged Configuration Graphite Plugged
GB71 NAAMS Standard
80 Max ID mm
260 Max Temp °C
GB71 Flanged Graphite Plugged Bronze Bushing
Product Overview

The GB71 NAAMS flanged graphite plugged bronze bushing is a self-lubricating sleeve bearing designed for automotive body assembly tooling. Manufactured to NAAMS (North American Automotive Metric Standards) specifications, this bearing features a flanged configuration with graphite plugs distributed across both the cylindrical bore and flange face. The bronze substrate provides load capacity up to 200 N/mm² static, while the graphite plugs deliver continuous lubrication without external oil. The flange design simplifies installation and provides axial location in NAAMS standard tooling plates. Custom dimensions, graphite patterns, and flange configurations are available based on application requirements.

NAAMS Standard Compliance Manufactured to GB71 NAAMS specifications ensuring interchangeability with existing automotive assembly tooling systems.
Flanged Retention Integral flange eliminates separate retaining hardware. Provides positive axial location in NAAMS standard counterbores.
Dual Surface Lubrication Graphite plugs on both bore and flange face ensure lubrication for radial guidance and axial thrust contact surfaces.
Customizable Configuration Dimensions, graphite plug pattern, flange thickness, and bore tolerances adjustable to meet specific tooling requirements.
Core Advantages
  • NAAMS GB71 standard dimensions ensure direct replacement in automotive tooling
  • Graphite plugged design eliminates lubrication maintenance in production environments
  • Flanged configuration provides axial location without additional components
  • Brass substrate offers corrosion resistance and high load capacity
  • Custom sizes and graphite patterns available for non-standard applications
Product Characteristics
  • Material: CuSn8 bronze with high purity graphite plugs
  • Flange OD: 1.5x to 1.8x bushing OD per NAAMS
  • Graphite coverage: 18-22% on bore, 12-16% on flange face
  • Bore tolerance: ISO H8 at 20°C reference
  • Operating temperature: -40°C to 260°C continuous
Application Scenarios
Automotive body assembly tooling guide pins
NAAMS standard die set ejector systems
Welding fixture locating mechanisms
Robotic end effector pivot bearings
Press tool transfer guide systems
Custom automotive manufacturing fixtures
Customization Available Dimensions, graphite plug pattern, flange geometry, and bore tolerances can be modified to suit specific tooling requirements. Engineering consultation available for non-standard applications.
ID: 6-80mm
OD: 12-100mm
Flange: Custom ratios
Frequently Asked Questions
What does GB71 NAAMS specify for this bearing
GB71 is the NAAMS standard for flanged graphite plugged bronze bushings used in automotive body assembly tooling. It defines outer diameter, flange dimensions, length tolerances, and graphite plug distribution patterns.
Can the flange diameter be modified from NAAMS standard
Yes. While standard GB71 bearings follow NAAMS flange ratios, custom flange diameters and thicknesses are available for non-standard tooling plates. Minimum order quantities apply for custom configurations.
Are graphite plugs replaceable after wear
No. The graphite plugs are permanently embedded during manufacturing. When the graphite depth wears below 0.5mm or wear exceeds 0.06mm on the bore diameter, the bushing should be replaced.
What counterface material is recommended for NAAMS guide pins
Hardened tool steel with 55-60 HRC and surface finish Ra 0.2-0.4 micrometers. The graphite plugs provide lubrication against this hardened surface without additional oil.
How to install GB71 bearings in NAAMS tooling plates
Press fit using a flat tool contacting the flange face uniformly. Counterbore depth must match flange thickness. Do not apply force to the bore surface or graphite plugs during installation.
Are custom lengths available for non-standard stroke requirements
Yes. Standard GB71 lengths can be extended or shortened. Custom lengths up to 200mm available with consultation. Non-standard lengths require minimum order quantity.

Standard No. NAAMS Code d d1 d2 L L1
GB71 2540 G712540 25 32 40 40 4
GB71 3250 G713250 32 40 50 50 4
GB71 4055 G714055 40 50 63 55 5
GB71 5063 G715063 50 63 71 63 6
GB71 6375 G716375 63 80 90 75 8
GB71 8090 G718090 80 100 112 90 10
GB71 1001 15 G711011 100 125 140 115 12
GB71 125138 G711213 125 160 180 138 12
Zhejiang Shuangnuo Bearing Technology Co., Ltd.
Zhejiang Shuangnuo Bearing Technology Co., Ltd. is China Flanged Graphite Plugged Bronze Bushing, Self Lubricating Oilless Bronze Sleeve Bearing GB71 NAAMS Suppliers and Wholesale Flanged Graphite Plugged Bronze Bushing, Self Lubricating Oilless Bronze Sleeve Bearing GB71 NAAMS 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.
  • 0+
    Establishment

    Founded in 2014, Shuangnuo has 10 years of experience in the industry.

  • 0+
    Advanced Equipment

    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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    Happy Clients

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

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