HRC 58 S136 Core Inserts | High-Flatness Precision ID Ground Mold Parts

Product Overview

Senlan Precision supplies S136 core inserts hardened to HRC 58, manufactured with precision inner grinding to achieve high flatness and stable dimensional accuracy. These core inserts are produced strictly Built-to-Print, designed for injection molds requiring corrosion resistance, fine surface quality, and long-term dimensional stability in multi-cavity and high-cycle production.

Key Features & Advantages

• S136 stainless mould steel with excellent corrosion resistance

• HRC 58 hardness for balanced wear resistance and toughness

• Precision inner grinding for high flatness and concentricity

• Stable dimensions suitable for tight-tolerance mold assemblies

• OEM / custom manufacturing according to customer drawings

• Consistent interchangeability for maintenance and spare use

Applications / Industry Use

• Bottle cap and closure injection molds

• Packaging molds with multi-cavity layouts

• Medical plastic molds requiring clean surfaces and dimensional stability

• High-cycle injection molding tools

• Replacement core inserts for existing molds

Mold Structure & Design Description

The core insert forms critical internal geometry within the mold cavity. High flatness ensures uniform contact and proper alignment with mating mold components, reducing flash and wear. Precision inner grinding improves concentricity and surface quality, contributing to stable demolding and consistent part geometry during long production runs.

Manufacturing Capability & CNC Machining

• Equipment: High-precision CNC and grinding machines from MAKINO (Japan) and HARDINGE (USA)

• Processes: CNC milling, CNC turning, inner grinding, heat treatment, fine finishing

• Tolerance control: Executed strictly per customer drawings

• Surface finish: Optimized for mold performance and wear resistance

• Production scale: Prototype to batch and long-term repeat supply

Custom Development / OEM Workflow

1. Drawing and technical requirement review

2. Material and hardness confirmation (S136 / HRC 58)

3. Precision machining and inner grinding

4. Heat treatment and final finishing

5. Inspection, packaging, and export delivery

Quality Control & Export Experience

• Raw material traceability and inspection

• In-process dimensional and flatness checks

• Hardness verification after heat treatment

• Final inspection against drawings and specifications

• Stable export supply experience for international mold manufacturers

Related Products

• Mold cavity inserts

• Core pins and stepped core components

• Threaded core inserts

• Built-to-print mold spare parts

FAQ (Technical & Purchasing)

Q1: Is this S136 core insert a standard item?
No. All core inserts are custom-manufactured based on customer drawings.

Q2: Why choose HRC 58 instead of higher hardness?
HRC 58 offers a balance between wear resistance and toughness, reducing the risk of cracking in high-cycle molds.

Q3: What flatness levels can be achieved?
Flatness is controlled according to drawing requirements and verified through precision inspection.

Q4: Can this be used as a replacement insert?
Yes, it is commonly supplied as a replacement part when built to original specifications.

Get a Quote

Send your drawings, material specifications, hardness requirements, and quantities. Senlan Precision will provide a technical quotation for HRC58 S136 Core Inserts with Precision Inner Grinding, manufactured strictly to your injection mold requirements.