Our precision Ejector Pins & Sleeves are essential components for high-performance injection molds. We offer a comprehensive range of standard and custom Ejector Pins (Pinos Extratores) and Ejector Sleeves (Buchas de Extração / Camisas de Extração) designed to meet strict DIN and JIS standards.
What is Core Pins ？ Core pins are integral components in injection molding and die casting, used to create internal cavities and shapes in molded parts. They play a vital role in defining the part’s dimensions and features. Gunri offers precision-engineered core pins designed to meet the intricate requirements of molding applications. Our core pins…
What is Ejector Pins ？ ejector pins are essential components in injection molding and die casting processes. They are used to eject molded parts from the mold cavity, ensuring smooth and efficient production. Gunri offers high-quality steel ejector pins crafted from premium materials for enhanced durability and performance. Our precision manufacturing process ensures accurate dimensions…
Custom-made Flat Ejector Pins (also known as Blade Ejector Pins) designed for narrow ribs and deep slot ejection. Our Pinos Extratores Laminares are manufactured from premium SKD61/H13 steel with high-quality nitriding for superior wear resistance.
Precision: ±0.002mm
Customization: Based on your technical drawings.
High-performance Ejector Sleeves (Camisas de Extração) designed for reliable part ejection in multi-component molds. Perfectly matched with our center pins for seamless operation.
Material: SKD61 / H13
Hardness: Surface 900-1100 HV
Standard: DIN 1530-D / JIS
What is Rectangular Ejector Pins ？ Rectangular ejector pins are essential components in molding and casting processes, designed specifically to eject parts with flat or rectangular surfaces from molds. They play a critical role in ensuring efficient part ejection. Gunri specializes in providing high-quality rectangular ejector pins that are meticulously crafted for precise part ejection….
High-precision Shouldered Ejector Pins designed for increased stability and strength in injection molding. These Pinos Extratores com Ressalto (Stepped Pins) are ideal for small diameter ejection requirements where extra support is needed at the base.
Type: Stepped / Shouldered Design
Service: OEM Customization according to your drawings.
Whether you need Flat Ejector Pins, Shouldered Pins, or high-precision Ejector Sleeves for complex mold designs, our products ensure smooth ejection cycles and long service life.
We specialize in manufacturing from SKD61 and H13 steel with advanced nitriding treatments, serving professional toolmakers in Brazil, Portugal, and worldwide.
Custom sizes are available according to your technical drawings.
Advanced nitriding treatment provides an ultra-hard surface layer that minimizes heat generation and prevents galling during high-frequency reciprocating movements.
By maintaining a tough and flexible core, our pins can withstand high ejection pressures without snapping, significantly reducing unexpected mold downtime.
Precise concentricity between pins and sleeves ensures smooth mechanical action, effectively eliminating plastic flash caused by improper clearance.
Our components are tested for millions of cycles, making them ideal for high-volume production in the automotive and packaging industries.
Automotive Industry: Reliable ejection for large structural parts and intricate interior trim components.
Consumer Electronics: Ultra-thin pins for smartphone housings and high-precision micro-connectors.
Medical Devices: Mirror-polished pins for cleanroom-grade medical disposables and surgical tools.
A: SKD61 (H13) offers superior heat resistance and can be nitrided, making it ideal for high-temperature injection molding. 65Mn is a cost-effective choice for simpler, low-temperature molds with shorter production runs.
A:
Mechanical Buckling and Breakage: Overly thin or long pins can easily bend or snap when overcoming high ejection resistance caused by insufficient draft angles.
Thermal Expansion and Galling: Differential thermal expansion between the pins and the mold core can eliminate clearances, causing the pins to seize up or gall during high-temperature operations.
Flash and Seizure from Poor Tolerances: Incorrect clearance fits can allow molten plastic to seep into the pin holes, creating flash that drags back into the bore and jams the mechanism.
A: We use high-precision internal grinding and vacuum heat treatment to ensure a perfect clearance. For extreme cases, we offer DLC coatings or self-lubricating treatments to eliminate oil contamination.
A: Yes, we provide full customization services including flat pins, stepped pins, and pins with specific head shapes based on your 2D/3D technical drawings.
We give value to the excellence and top class engineers, but in terms of accurate service.
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