S136 Stainless Steel Core Pins | Precision-Ground 0.01mm Mold Components

Product Overview

S136 Core Pins Precision Mould Parts are engineered for high-accuracy injection mould applications requiring stable hardness, corrosion resistance, and consistent dimensional control. Manufactured by Senlan Precision on a Built-to-Print (OEM) basis, these core pins are heat-treated to 48–52 HRC and finished by precision grinding to achieve ±0.01 mm accuracy, supporting reliable performance in multi-cavity moulds.

Key Features & Advantages

• Material: S136 stainless mould steel for corrosion resistance

• Hardness: 48–52 HRC for balanced wear resistance and toughness

• Accuracy: Precision grinding to ±0.01 mm

• Dimensional stability under long production cycles

• Consistent cavity-to-cavity performance in multi-cavity moulds

• Fully customized geometry and tolerances (Built-to-Print)

Applications / Industry Use

• Plastic bottle caps and closures

• Cosmetic packaging moulds

• Medical packaging and disposable moulds

• Precision moulds requiring corrosion resistance

• Multi-cavity injection moulds with tight tolerance demands

Mould Structure & Design Description

Core pins are critical forming elements installed in the core side of injection moulds to define internal features, holes, or cylindrical profiles. For S136 core pins, material cleanliness and heat-treatment stability are essential to maintain accuracy after hardening. These pins are designed to minimize deformation during moulding cycles, ensuring consistent part geometry and reducing maintenance frequency.

Pin length, diameter, fillet transitions, and surface finish are defined strictly according to customer drawings and mould structure requirements.

Manufacturing Capability & CNC Machining

Senlan Precision produces S136 core pins using a controlled, process-driven workflow focused on accuracy and repeatability:

• CNC turning and milling for rough machining

• Controlled vacuum heat treatment to reach 48–52 HRC

• Precision cylindrical grinding for ±0.01 mm tolerance

• Surface finishing based on mould release requirements

• Full dimensional inspection before delivery

High-precision machining is supported by equipment from MAKINO (Japan) and HARDINGE (USA), ensuring stable quality for precision mould components.

Custom Development / OEM Cooperation Process

1. Customer submits drawings, tolerances, and technical notes

2. Engineering review of material, hardness, and accuracy targets

3. Confirmation of manufacturing process and inspection criteria

4. CNC machining, heat treatment, and precision grinding

5. Final dimensional and hardness inspection

6. Export packaging and shipment

All parts are supplied strictly as OEM / Built-to-Print components.

Quality Control & Export Experience

• ISO-compliant quality management system

• Incoming material verification for S136 steel

• In-process control after heat treatment

• Final inspection for diameter, straightness, and tolerance

• Long-term export supply to international mould manufacturers

Related Products

• Precision mould core pins and sleeves

• Thread core inserts for cap moulds

• Injection mould cavities and inserts

• High-precision ejector pins

• Multi-cavity mould spare parts

FAQ – Technical & Purchasing

Q1: Why choose S136 material for core pins?
S136 offers good corrosion resistance, uniform hardness, and dimensional stability, making it suitable for packaging and medical moulds.

Q2: Is ±0.01 mm achievable after heat treatment?
Yes. Final precision grinding is performed after hardening to ensure dimensional accuracy.

Q3: Are standard sizes available?
No. Senlan Precision focuses on customized Built-to-Print manufacturing only.

Q4: Can surface finish be specified?
Yes. Surface roughness and finishing methods are defined according to mould design and resin requirements.

Request a Quote

Please share your drawings or specifications to receive a quotation for S136 Core Pins Precision Mould Parts (48–52 HRC, ±0.01 mm Accuracy).
Senlan Precision supports OEM manufacturing of high-precision mould components for packaging, cosmetic, and medical injection mould applications.