JOSG Ejector Guide Bush

We provide custom manufacturing of finished bronze parts and self-lubricating bronze, precisely based on our clients’ drawings.

JOSG Ejector Guide bush

JOSG Ejector Guide Bush – High-Performance Self-Lubricating Solution

The JOSG Ejector Guide Bush is a specialized component used primarily in injection molding to guide ejector pins during the ejection phase. It ensures that the pins move in a straight line, maintaining alignment as they push molded parts out of the mold cavity.

Functionality of JOSG Ejector Guide Bushes

  • Guidance: The JOSG ejector guide bush keeps ejector pins aligned, preventing bending or misalignment that could damage both molded parts and the mold.
  • Self-Lubrication: Many JOSG guide bushes are made from high-strength bronze graphite, providing low friction and self-lubricating properties. This feature is valuable in high-stress environments, reducing wear and extending component lifespan.
  • Metric Sizing: JOSG ejector guide bushes come in a variety of metric sizes, offering compatibility with different machines and requirements in injection molding.
Industrial JOSG Ejector Guide Bush for die-casting equipment
JEGB / JEGBK Oilless Ejector Guide Bearing

Types of JOSG Ejector Guide Bushes

  • Straight Guide Bushes: Used for direct ejection processes where ejector pins need straightforward guidance.
  • Angled Guide Bushes: Designed for applications requiring angled ejection, such as for parts with undercuts, helping to minimize pin stress.
  • Stepped Guide Bushes: Allow multiple pin sizes to be used with one bush, facilitating easier pin changes and reducing tooling costs.
  • Demountable Guide Bushes: Easily removable and ideal for molds with complex ejection systems or frequent pin changes, enhancing efficiency by minimizing downtime.

Benefits of Using CuZn25Al5Mn4Fe3 JOSG Ejector Guide Bushes

  • Improved Part Quality: These bushes ensure ejector pins stay aligned, reducing defects in molded parts.
  • Increased Efficiency: Better guidance reduces cycle times, enhancing production efficiency.
  • Reduced Mold Damage: Preventing pin misalignment minimizes the risk of mold damage, lowering maintenance costs and extending mold life.
  • Operator Safety: Minimizing the risk of pin breakage or bending contributes to a safer working environment during the ejection process.
Graphite-plugged self-lubricating JOSG Ejector Guide Bush
Standard No. d L L1 L2 t D Tolerance D1 L1 Standard No. d L L1 L2 t D Tolerance D1 L1
e7 k6 e7 k6
JOSG-9×15 9 12 15 3 3 14 -0.032
-0.050		 +0.012
+0.001		 16 9 +0.015
0		 JOSG-24×26 24 17 26 9 6 30 -0.040
-0.061		 +0.015
+0.002		 35 24 +0.021
0
JOSG-9×20 17 20 JOSG-24×31 22 31
JOSG-9×25 22 25 JOSG-24×36 27 36
JOSG-9×30 27 30 JOSG-24×45 36 45
JOSG-9×39 36 39 JOSG-24×55 46 55
JOSG-10×15 10 12 15 10 JOSG-24×65 56 65
JOSG-10×20 17 20 JOSG-24×75 66 75
JOSG-10×25 22 25 JOSG-24×85 76 85
JOSG-10×30 27 30 JOSG-24×95 86 95
JOSG-10×39 36 39 JOSG-30×36 30 27 36 42 -0.050
-0.075		 +0.018
+0.002		 47 30
JOSG-14×26 14 17 26 9 6 20 -0.040
-0.061		 +0.015
+0.002		 25 14 +0.018
0		 JOSG-30×45 36 45
JOSG-14×31 22 31 JOSG-30×55 46 55
JOSG-14×36 27 36 JOSG-30×65 56 65
JOSG-14×45 36 45 JOSG-30×75 66 75
JOSG-14×55 46 55 JOSG-30×85 76 85
JOSG-14×65 56 65 JOSG-30×95 86 95
JOSG-15×26 15 17 26 15 JOSG-30×105 96 105
JOSG-15×31 22 31 JOSG-30×125 116 125
JOSG-15×36 27 36 JOSG-32×36 32 27 36 32 +0.025
0
JOSG-15×45 36 45 JOSG-32×45 36 45
JOSG-15×55 46 55 JOSG-32×55 46 55
JOSG-15×65 56 65 JOSG-32×65 56 65
JOSG-18×26 18 17 26 26 31 18 JOSG-32×75 66 75
JOSG-18×31 22 31 JOSG-32×85 76 85
JOSG-18×36 27 36 JOSG-32×95 86 95
JOSG-18×45 36 45 JOSG-32×105 96 105
JOSG-18×55 46 55 JOSG-32×125 116 125
JOSG-18×65 56 65 JOSG-40×68 40 56 68 12 10 54 -0.060
-0.090		 +0.021
+0.002		 60 40
JOSG-18×75 66 75 20 +0.021
0		 JOSG-40×78 66 78
JOSG-20×26 20 17 26 JOSG-40×88 76 88
JOSG-20×31 22 31 JOSG-40×98 86 98
JOSG-20×36 27 36 JOSG-40×108 96 108
JOSG-20×45 36 45 JOSG-40×128 116 128
JOSG-20×55 46 55 JOSG-40×148 136 148
JOSG-20×65 56 65 JOSG-40×168 156 168
JOSG-20×75 66 75 JOSG-42×68 42 56 68 42
10SG-22×26 22 17 26 30 35 22 JOSG-42×78 66 78
JOSG-22×31 22 31 JOSG-42×88 76 88
JOSG-22×36 27 36 JOSG-42×98 86 98
JOSG-22×45 36 45 JOSG-42×108 96 108
JOSG-22×55 46 55 JOSG-42×128 116 128
JOSG-22×65 56 65 JOSG-42×148 136 148
JOSG-22×75 66 75 JOSG-42×168 156 168
JOSG-22×85 76 85
JOSG-22×95 86 95

JOSG Ejector Guide Bush – High-Performance Self-Lubricating Bushings for Injection Molds

The JOSG series consists of high-performance, graphite-embedded, self-lubricating ejector guide bushings, engineered specifically for plastic injection molds and die-casting dies. Constructed from high-tensile brass alloys with strategically embedded graphite plugs, these bushings deliver precise guidance and smooth motion without the need for external lubrication.

Core Applications of JOSG Ejector Guide Bush

Precision Ejector Plate Guidance
JOSG bushings ensure that the ejector plate moves perfectly parallel to the mold base, preventing ejector pins from bending or breaking due to misalignment.

High-Cycle Production
Being oil-free, these bushings are ideal for fast-cycling molds where traditional grease could degrade or contaminate parts.

Cleanroom Compatibility
Perfect for medical, food, and packaging mold production, where oil mist or grease leakage is strictly prohibited.

Technical Advantages for Industrial Use

Maintenance-Free Operation
The embedded graphite forms a lubricating film during movement, eliminating manual lubrication and reducing downtime.

High Load Capacity
The robust brass alloy handles heavy pressures, while the graphite minimizes friction, making these bushings suitable for large, heavy mold bases.

Thermal Stability
JOSG bushings maintain consistent performance in high-temperature applications, such as die-casting or high-heat resin injection, where conventional oil-based lubricants fail.

Galling Resistance
The material combination prevents seizing between the guide pillar and bushing, even under lateral pressure.

Key Specifications & Standards

Feature Standard Detail
Material High-tensile brass (e.g., CuZn25Al5Mn4Fe3) + Graphite
Hardness > 210 HB
Max Temperature Up to 300°C (depending on alloy)
Fit H7/f7 or H7/g6 tolerances with guide pins

Implementation Tip: For optimal performance, ensure the mating guide pillar has a surface hardness of HRC 55 or higher. This allows the graphite film to form correctly without causing abrasive wear on the steel surface.

The JOSG Ejector Guide Bush series combines durability, precision, and self-lubricating efficiency, making it an essential component for high-performance injection molding and die-casting operations. Ideal for high-cycle, cleanroom, and high-temperature applications, these bushings reduce maintenance needs while enhancing mold reliability.

Custom CNC Oil-free Bearing Solutions

Custom Oil-Less Bearing Bushing

Self-lubricating bearing selection and drawing confirmation