Custom CNC Machined Brass Heat Set Inserts

FlexiTurn manufactures custom brass heat-set threaded inserts with high-definition herringbone knurling, delivering superior pull-out resistance, rotational torque retention, and strict thread concentricity for thermoplastic enclosure assemblies. Single-setup CNC turning and precision rolling eliminate axial runout and thread pitch errors, ensuring reliable thermal installation into ABS, PC, PA66, and PBT housings.

Precision CNC Turning & Knurling Capabilities

• Single-Setup Rotational Turning: External shoulders, lead chamfers, and core bores are machined in a single CNC chucking cycle on C36000 brass stock, holding strict bore-to-OD concentricity ($\le 0.008\text{ mm}$) and uniform axial length.
• Precision In-Cycle Herringbone Knurling: Formed with high-rigidity rolling tooling to create sharp, uniform opposing diagonal teeth. This geometry creates opposing mechanical locks that maximize both tensile pull-out force and torsional shear resistance.
• Controlled Pitch Threading: ISO Metric and UN internal threads are machined to controlled pitch diameter tolerances ($6\text{H} / 2\text{B}$), preventing thread distortion, binding, or stripping during high-volume automated installation.
• Self-Aligning Lead Chamfers: Precision entry and exit chamfers facilitate smooth pilot-hole centering during heat-stake or ultrasonic insertion, preventing plastic flash overflow and cocked assembly.

Materials & Technical Specifications

Quality Assurance & Insertion Integrity Verification

Every brass insert production batch operates under FlexiTurn’s ISO 9001:2015-aligned quality management system:

• 100% Material Traceability: Raw material batch tracking supported by certified EN 10204 3.1 Mill Test Reports.
• Thread Pitch Inspection: 100% in-process verification using calibrated Go/No-Go thread plug gauges and optical comparators.
• Automated Burr Screening: Optical vision screening ensures zero micro-burrs or loose metal chips inside internal threads, protecting downstream fast-assembly tooling.

Why Choose FlexiTurn

• Specialized Insert Machining Expertise: High-precision turning workcells and custom rolling tooling deliver uniform knurl definition and predictable retention forces across all batch sizes.
• Single-Setup Concentricity Control: Machining all rotational features without re-clamping eliminates cumulative runout, guaranteeing smooth screw engagement post-insertion.
• High-Volume Production Capacity: Multi-spindle CNC turning platforms support scalable transitions from rapid prototyping to high-volume automated production runs.
• 100% In-House Process Ownership: Material preparation, precision turning, knurling, threading, degreasing, and optical inspection are conducted on-site with zero subcontracting.
• Complimentary 24-Hour DFM Review: Technical assessments evaluate knurl pitch selection, wall thickness ratios, and pilot chamfers to optimize insertion performance and reduce unit costs.
• Strict Intellectual Property Protection: Customer CAD models, drawing callouts, and proprietary specifications are secured under encrypted protocols, with NDAs executed prior to file transfer.

Partner with FlexiTurn

Submit your 2D/3D CAD drawings (STEP/IGES/PDF) with thread specifications, target plastic material, and batch volumes. FlexiTurn delivers technical DFM reviews and direct-factory quotations within 24 hours.

Q1. What types of machining services do you offer?

We provide comprehensive CNC turning and milling services. FlexiTurn machines are equipped with 8-station programmable turrets and support both turning and 5-axis milling operations, making them suitable for everything from simple cylindrical parts to complex multi-axis components.

Q2. What materials can you work with?

We machine a wide range of materials including carbon steel, stainless steel, aluminum, plastics, and other engineering-grade materials. If you have a specific material in mind, just send us your requirements and we'll confirm feasibility.

Q3. What is your typical lead time?

Lead times vary depending on part complexity, quantity, and material availability. For prototypes and small-batch runs, we typically deliver within 5–10 business days. For high-volume production, we'll provide a customized schedule after reviewing your drawings. Contact us with your project details for an accurate timeline.

Q4. How do you price your services?

Pricing is based on several factors: material cost, machining time, tooling requirements, setup complexity, and order quantity. We offer competitive rates for both low-volume prototypes and high-volume production runs. Request a quote with your CAD files or drawings and we'll get back to you within 24 hours.

Q5. What quality control measures do you have in place?

We follow strict quality control procedures throughout the machining process. Our CNC systems support programmable precision down to 1 μm, ensuring high accuracy and repeatability. Every batch undergoes dimensional inspection before shipping, and we can provide inspection reports upon request.