High-Cycle Pipette Tip Mold Inserts | Custom Nitrided Shoulder Pins for Labs

Product Overview

Custom nitrided shoulder core pins are precision mold components used in injection molds for laboratory pipette tips and related medical plastic parts. Manufactured through high-accuracy CNC machining and controlled nitriding processes, these core pins provide enhanced surface hardness, wear resistance, and stable dimensional accuracy. All components are custom produced strictly according to customer drawings and technical specifications.

Key Features & Technical Advantages

• Precision-manufactured shoulder core pins for injection molds

• CNC machining with tight dimensional control

• Nitriding surface treatment for improved wear resistance

• Hardened surface while maintaining core toughness

• Stable geometry for high-cavity medical molds

• Consistent surface condition for reliable molding and demolding

• Fully customized / OEM / Built-to-Print manufacturing

Applications & Industries

These nitrided shoulder core pins are widely used in:

• Injection molds for laboratory pipette tips

• Medical consumable molds requiring high precision

• Multi-cavity molds for thin-wall plastic components

• Precision molds with strict dimensional consistency requirements

They are particularly suitable for applications requiring long service life, surface durability, and stable molding performance.

Mold Structure & Design Description

Shoulder core pins are installed on the core side of injection molds and are responsible for forming internal geometries and shoulder features of molded parts.
Key design considerations include:

• Accurate shoulder position and diameter control

• Proper fit and alignment within mold plates

• Structural strength to withstand injection pressure

• Compatibility with multi-cavity and interchangeable mold designs

All core pins are designed and manufactured strictly according to customer drawings to ensure correct assembly and stable mold operation.

Manufacturing Capability & CNC Machining

Senlan Precision manufactures nitrided shoulder core pins using advanced CNC machining and finishing processes.
Our production facilities are equipped with high-precision machining centers and CNC lathes from MAKINO (Japan) and HARDINGE (USA), along with other internationally recognized equipment, enabling:

• Machining accuracy up to ±0.002 mm

• Stable tolerance control for slender and stepped core pins

• Consistent surface quality prior to nitriding

• Reliable repeatability across production batches

Nitriding is applied after machining to enhance surface hardness without compromising dimensional stability.

Custom Manufacturing & OEM Cooperation

We specialize in custom manufacturing and OEM cooperation, supporting:

• Built-to-Print production based on 2D drawings or 3D models

• Custom material selection and heat treatment options

• Nitriding and other surface treatment processes

• Small-batch prototyping and volume production

• Long-term supply of replacement and spare mold components

Technical communication is maintained throughout the project to ensure accurate implementation of customer specifications.

Quality Control & Export Experience

With over 20 years of experience in exporting precision mold components, Senlan Precision operates a structured quality control system:

• Incoming material inspection and traceability

• In-process dimensional inspection after machining

• Surface hardness and treatment verification

• Final inspection prior to shipment with complete documentation

We are experienced in international technical communication, quality expectations, and export packaging requirements.

Related Mold Components

• Precision mold core pins

• Mold cavity inserts

• Mold sleeves and ejector components

• Multi-cavity mold spare parts

All related products are available on a custom manufacturing basis.

Technical FAQ

Q1: Are shoulder core pins manufactured strictly according to drawings?
Yes. All shoulder core pins are produced strictly based on customer-provided drawings and specifications.

Q2: What is the advantage of nitriding for core pins?
Nitriding increases surface hardness and wear resistance while maintaining core toughness, making it suitable for high-cycle molds.

Q3: What machining tolerance can be achieved?
Depending on pin geometry and length, machining accuracy up to ±0.002 mm can be supported.

Q4: Can these core pins be supplied as replacement parts for existing molds?
Yes. Replacement and interchangeable core pins can be manufactured to match existing mold designs.

Request a Quotation

For pricing, lead time, or technical discussion regarding custom nitrided shoulder core pins for pipette tip injection molds, please provide your drawings or technical specifications.
Our engineering team will review your requirements and provide a professional quotation accordingly.