Product / PET Injection Mold / Mold Core Bushing

Mold Core Bushing

Product Overview

BJY 46×72 Core Seat Bushing is a precision component used in PET preform molds. Installed between the mold core and core seat, it provides positioning, support, and wear protection. Its stable fit and wear resistance help reduce wear during long-term operation, protect the core seat, and simplify maintenance.

In the beverage industry, every minute a mold is out of the machine can mean lost production. Traditional maintenance workflows can involve complex repairs when mold tolerances begin to drift. BJY’s modular approach, centered around high-precision components such as the 46×72 core seat bushing, helps technicians restore the core-seat fit and positioning accuracy in less time than traditional seat repairs may require.

2.BJY Core Seat Bushing – Technical Specification

Parameter	Description & Specification
Product Name	Core Seat Bushing
Dimensions	46 mm × 72 mm
Material	High-Grade Alloy Tool Steel
Heat Treatment	Multi-Stage Vacuum Heat Treatment
Surface Finish	Precision Ground, High-Finish Surface
Tolerance	Micron-Level Precision Control
Application	PET Preform Injection Molds / High-Speed Beverage Packaging Lines
Function 1: Positioning	Maintains the concentricity and axial position of the mold core, helping reduce the risk of misalignment
Function 2: Load Bearing	Handles contact loads during mold operation and helps protect the core seat body
Function 3: Wear Protection	Serves as a replaceable wear-resistant component to reduce direct wear between the mold core and core seat
Maintenance	Replaceable design for easier maintenance and reduced downtime impact
Brand Legacy	BJY (Baijinyi Precise Technology) — Established in 2011
Product Series	BJY Mastery Precision Series

Localizing Wear to a Replaceable Component

The primary advantage of a replaceable bushing is that it provides a dedicated wear-resistant mating surface. Friction and mechanical loads are inevitable in high-volume injection molding, but the replaceable bushing helps protect the core seat from direct wear. When a routine inspection reveals that the core fit has become loose, there may be no need to send the entire seat block to a machine shop. Instead, the worn bushing can be removed and replaced with a new BJY unit. This helps restore the mating surface to the specified fit and dimensional requirements, allowing production to resume with the intended core positioning and fit.
Controlled Surface Finish for Smoother Installation

Furthermore, BJY’s controlled surface finishes and dimensional tolerances help reduce friction during assembly and disassembly. We understand that galling can be a risk when working with high-tolerance steel components. By controlling the internal and external surface finishes of our bushings, we help facilitate smooth installation and reduce the risk of galling or damage to the mating surfaces. For the procurement department, this can contribute to a lower total cost of ownership for the mold. Instead of reacting only to major component failures, maintenance teams can manage wear through a more predictable replacement cycle.
Reliable Fit for Demanding Production Conditions

BJY’s commitment to engineering precision ensures that our spare parts are manufactured not only for accurate fit, but also for reliable performance under demanding production schedules. This provides a practical way to manage technical risk on the factory floor. Our technical support team is available to guide your staff through the installation process and help ensure reliable service life for each component.
A Smarter Approach to Long-Term Mold Maintenance

By choosing the BJY standard, manufacturers can take a more proactive approach to mold maintenance. A replaceable precision bushing helps protect the core seat, simplify maintenance, and reduce the potential impact of wear on production continuity. For high-speed beverage production, this modular maintenance approach supports more stable tooling performance and can contribute to lower maintenance costs over the long term.

Mold Core Bushing

2.BJY Core Seat Bushing – Technical Specification

Localizing Wear to a Replaceable Component

Controlled Surface Finish for Smoother Installation

Reliable Fit for Demanding Production Conditions

A Smarter Approach to Long-Term Mold Maintenance

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