H13 (SKD61) & 420SS (S136) Stepped Mold Pins | Custom Tooling for Pen Molds

Product Overview

SKD61 and S136 stepped core pins are precision injection mold components designed for applications requiring stable dimensional accuracy, high wear resistance, and consistent forming performance. These stepped core pins are commonly used in pen molds and other plastic injection molds with multi-level internal structures. All components are manufactured strictly according to customer drawings under a built-to-print model.

Key Features & Advantages

• Available in SKD61 and S136 tool steel materials

• Stepped core pin design for complex internal geometries

• High dimensional stability under molding pressure and temperature

• Precision machining suitable for multi-cavity mold systems

• Controlled concentricity and step transitions

• Custom manufacturing based on customer specifications (OEM)

Applications / Industry Use

• Pen and writing instrument molds

• Plastic caps and small precision plastic parts

• Packaging and daily-use plastic products

• Medical consumable mold components

• Injection molds with stepped or multi-diameter core structures

Mold Structure & Design Description

Stepped core pins are used to form internal profiles with multiple diameters or functional levels within injection-molded parts. The design requires precise control of step transitions, straightness, and concentricity to ensure proper filling, demolding, and long-term mold stability. Material selection such as SKD61 or S136 is determined based on wear conditions, corrosion requirements, and production volume.

Manufacturing Capability & CNC Machining

Senlan Precision produces stepped core pins using high-accuracy CNC machining and precision finishing processes. Our manufacturing capability is supported by advanced equipment, including machining centers from MAKINO and turning systems from HARDINGE.

Key manufacturing processes include:

• CNC turning and milling

• Precision grinding for stepped profiles

• EDM processing for fine features (if required)

• Surface finishing based on application needs

• Dimensional inspection and quality verification

Custom Development / OEM Cooperation Process

1. Customer provides drawings or 3D models

2. Technical review of material, tolerances, and structure

3. Manufacturing process planning

4. Precision machining and finishing

5. In-process and final quality inspection

6. Export packaging and shipment

All parts are manufactured strictly under a Built-to-Print OEM model.

Quality Control & Export Experience

• Incoming raw material inspection

• In-process dimensional control

• Final inspection using calibrated measuring instruments

• Traceable production records

• Experience supplying mold components to overseas customers

Related Products

• Precision mold core pins and sleeves

• Thread core inserts for caps and closures

• Cavity inserts for plastic injection molds

• Multi-cavity mold components

• Custom non-standard mold parts

FAQ – Technical & Purchasing

Q1: Can you manufacture stepped core pins only based on drawings?
Yes. All stepped core pins are produced strictly according to customer drawings or 3D models.

Q2: How do I choose between SKD61 and S136 material?
SKD61 is suitable for high-temperature and high-load conditions, while S136 is preferred for corrosion resistance and high surface quality requirements.

Q3: Are these core pins suitable for multi-cavity molds?
Yes. The manufacturing process ensures dimensional consistency suitable for multi-cavity mold systems.

Q4: Do you support small batch or prototype production?
Yes. Prototype, small batch, and volume production are all supported.

Request a Quote

To receive a quotation, please provide your drawings, material requirements, tolerance specifications, and estimated quantity.
Our engineering team will review your request and provide a technical and commercial response.