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Home / Product / JDB Solid-lubricating Bearing / High Temperature Brass JGB Oilless Ejector Guide Bearings
Wholesale High Temperature Brass JGB Oilless Ejector Guide Bearings
High Temperature Brass JGB Oilless Ejector Guide Bearings
  • High Temperature Brass JGB Oilless Ejector Guide Bearings

High Temperature Brass JGB Oilless Ejector Guide Bearings

Product Description:

High Temperature Brass JGB Oilless Ejector Guide Bearings are made of high-quality high-temperature brass material, which is resistant to high temperatures and does not require lubricating oil, effectively avoiding oil pollution and maintenance costs. Its unique design structure ensures that it can still maintain excellent guiding and supporting performance under high-speed rotation and high-load conditions. It is widely used in aerospace, machinery manufacturing, chemical industry and other fields.

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High Temperature Series | Ejector Guide Configuration

High Temperature Brass JGB Oilless Ejector Guide Bearings

Max Temp: 300°C Guide Type: Ejector Pin Material: High Temp Brass
Application Focus

The JGB series is specifically engineered for ejector guide applications in high temperature die casting, injection molding, and hot forming processes. These bearings guide ejector pins through heated platens where conventional lubricants degrade or carbonize. The brass substrate maintains dimensional stability at elevated temperatures while graphite lubricant inserts provide consistent low friction performance without external oil or grease.

300
°C
Continuous Operating Temp
0.20
μ
Friction at 250°C
T
Thermal Stability Profile
Coefficient of Expansion 19 x 10⁻⁶ /K (20-300°C)
Hot Hardness at 250°C 95 HB minimum
Compressive Strength at 300°C 350 N/mm²
Thermal Conductivity 48 W/m·K
G
Graphite Performance at High Temp
Lubricant Grade High Purity EG-99
Oxidation Onset Temp 550°C in air
Lubricant Coverage 20-25 percent surface area
Insert Retention Method Mechanical dovetail

Ejector Guide Bearing Design Features

01
Guide Bore Finish
Inner diameter surface finish Ra 0.4 micrometers. Maintains ejector pin alignment during high speed cycling.
02
Lead-in Chamfer
1.5mm x 20 degree chamfer on both ends. Facilitates ejector pin insertion and reduces edge damage.
03
Lubricant Channel
Internal graphite distribution ensures continuous lubrication even when pin stroke is intermittent.
04
Clearance Control
Maintains 0.02-0.05mm radial clearance at operating temperature for consistent ejection force.
05
Heat Dissipation
Brass substrate transfers heat away from guide interface. Reduces pin thermal expansion effects.

High Temperature Performance Comparison

Parameter JGB High Temp Brass Standard Bronze PTFE Lined Steel
Max Continuous Temp 300°C 180°C 260°C
Friction Coefficient at 250°C 0.18-0.22 0.35-0.45 0.20-0.25
Thermal Expansion Match to Steel 19 x 10⁻⁶/K 18 x 10⁻⁶/K 12 x 10⁻⁶/K
Load Capacity at 250°C 80 N/mm² 50 N/mm² 60 N/mm²
Lubrication Type Solid Graphite Solid Graphite Transfer Film
Suitable for Ejector Guide Yes Limited No

Primary Industry Deployment

Die Casting Ejector Systems Injection Mold Ejector Plates Hot Forging Die Guides Extrusion Press Ejectors Glass Molding Ejectors Rubber Compression Molds Ceramic Press Ejectors High Temp Automation Grippers

Standard JGB Ejector Guide Sizes

Inner diameter from 6mm to 100mm
Guide ID mm Outer Diameter mm Overall Length mm Recommended Clearance mm Max Pin Speed m/s
6 10 12, 16, 20 0.02 0.6
8 12 16, 20, 25 0.03 0.6
10 16 20, 25, 30 0.03 0.5
12 18 25, 30, 40 0.04 0.5
16 24 30, 40, 50 0.04 0.4
20 30 40, 50, 60 0.05 0.4
25 36 50, 60, 80 0.05 0.35
32 44 60, 80, 100 0.06 0.35
40 54 80, 100, 120 0.06 0.3
50 66 100, 120, 150 0.08 0.3
Custom lengths and step configurations available for ejector systems requiring non standard pin travel distances.
Technical Support Notes
Ejector pin material recommendation
H13 tool steel hardened to 48-52 HRC with surface finish Ra 0.2-0.4 micrometers. Avoid nitrided pins as surface compounds may react with graphite.
Thermal expansion compensation
At 300°C, an 80mm guide length expands approximately 0.45mm. Design ejector stroke to accommodate this expansion without pin binding.
Cooling line proximity
Maintain minimum 10mm distance between guide bearing and mold cooling channels. Excessive cooling can reduce guide temperature below desired operating range.
Pre-Installation Check
  • Measure housing bore for roundness within 0.005mm
  • Inspect ejector pin surface for scoring or tool marks
  • Verify guide length matches ejector stroke requirements
  • Confirm housing material coefficient matches brass expansion
Maintenance Schedule
  • Inspect guide bore after 5000 ejection cycles
  • Clean graphite transfer film from pin every 10000 cycles
  • Replace guide when ID wear exceeds 0.08mm
  • Check for pin galling marks during routine mold maintenance
Hot Hardness Retention 85% at 300°C
Lubricant Life in Cycles 50000 - 80000
Max Ejector Pin Load 1200 N
Guide Bore Tolerance ISO H8 at 20°C

Standard No. d L d G6   m6 L1 E
JGB-12×9 12  9  12  +0.017
+0.006		 18  +0.018
+0.007		 9 

4











6
JGB-12×14 14  14 
JGB-12×19 19  19 
JGB-12×24 24  24 
JGB-16×14 16  14  16  25  +0.021
+0.008		 14 
JGB-16×19 19  19 
JGB-16×24 24  24 
JGB-16×29 29  29 
JGB-16×34 34  34 
JGB-16×39 39  35 
JGB-20×14 20  14  20  +0.020
+0.007		 30  14 
JGB-20×19 19  19 
JGB-20×24 24  24 
JGB-20×29 29  29 
JGB-20X34 34  34 
JGB-20×39 39  39 
JGB-20×49 49  40 
JGB-25×24 25  24  25  39 +0.025
+0.009		 24 
JGB-25×29 29  29 
JGB-25×34 34  34 
JGB-25×39 39  39 
JGB-25×49 49  49 
JGB-25×59 59  50 
JGB-30×29 30  29  30  42 29 
JGB-30×34 34  34 
JGB-30×39 39  39 
JGB-30×49 49  49 
JGB-30×59 59  59 
JGB-30X69 69  60 
JGB-30×79 79  60 
JGB-35×29 35  29  35  +0.025
+0.009		 48  +0.025
+0.009		 29  8
JGB-35×39 34  34 
JGB-35X39 39  39 
JGB-35×49 49  49 
JGB-35×59 59  59 
JGB-35×69 69  69
JGB-35X79 79  70
JGB-40×39 40  39  40  55  +0.030
+0.011		 39  10
JGB-40×49 49  49 
JGB-40×59 59  59 
JGB-40×69 69  69 
JGB-40×79 79  79 
JGB-40×89 89  80 
JGB-50×49 50  49  50  70  49 
JGB-50×59 59  59 
JGB-50×69 69  69 
JGB-50×79 79  79 
JGB-50×89 89  89 
JGB-50×99 99  90 
JGB-60×59 60  59  60  +0.029
+0.010		 80  59 
JGB-60×69 69  69 
JGB-60×79 79  79 
JGB-60×89 89  89 
JGB-60×99 99  90 
JGB-60×109 109  90 
JGB-80×69 80  69  80 100  +0.035
+0.013		 69 
JGB-80×79 79  79 
JGB-80×89 89  89 
JGB-80×99 99  99 
JGB-80×109 109  100 
JGB-80×119 119  100 
Our Product //
Related Product
Zhejiang Shuangnuo Bearing Technology Co., Ltd.
Zhejiang Shuangnuo Bearing Technology Co., Ltd.
Zhejiang Shuangnuo Bearing Technology Co., Ltd. is China High Temperature Brass JGB Oilless Ejector Guide Bearings Suppliers and Wholesale High Temperature Brass JGB Oilless Ejector Guide 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.
  • 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.

  • 0+
    Happy Clients

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

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