Blind Threaded Brass Inserts with Closed End Design
Lead-free custom precision fasteners designed for clean injection molding applications
Blind Threaded Brass Inserts Overview
In insert molding processes, molten plastic easily seeps into the threads of through-hole nuts, requiring additional tapping cleanup operations that add cost and time. Our brass inserts with blind closed-end design structurally block plastic melt from entering the threaded area, eliminating post-processing steps while ensuring thread cleanliness and integrity for reliable screw fastening.
Precision Manufacturing Process
Using Swiss-type lathes, we complete turning, drilling, tapping, and end-face closure in a single setup, ensuring uniform bottom wall thickness with no leakage risk. The closed-end design acts as a physical barrier during insert molding, completely blocking molten plastic from entering the threaded area. After ejection, you receive finished components with clean threads requiring no secondary operations.
This design is particularly valuable for micro inserts (M2-M3) where thread cleaning is difficult and prone to damage. As a certified factory with 15 years of precision manufacturing experience serving 2,000+ global clients, we are committed to eliminating hidden costs and quality risks from your production at the design stage.
Product Features & Advantages
| Feature |
Advantage to You |
| Completely Eliminates Flash Issues |
Closed-end design creates a physical barrier that completely blocks plastic melt from entering the threaded area during insert molding. Eliminates post-cleaning steps, reducing manufacturing cost and improving production efficiency. |
| Protects Thread Precision & Cleanliness |
No secondary tapping required; threads remain in factory-precise condition. Ensures consistent screw fastening torque, avoiding stripping or insufficient clamping force due to incomplete cleaning. |
| Ideal Choice for Micro Inserts |
For micro threads like M2 and M2.5, cleaning easily damages thread profiles. Blind hole design fundamentally solves this issue, making it the preferred solution for precision micro assemblies. |
| Customizable Blind Depth & Wall Thickness |
We can customize blind hole depth and bottom wall thickness based on your mold design and strength requirements. Ensures anti-flash functionality without compromising overall insert strength. |
| 15 Years Precision Turning Expertise |
Swiss-type lathes complete machining in one setup, ensuring uniform bottom wall thickness. IATF16949 certified quality with high batch-to-batch consistency. |
Product Specifications
| Specification Item |
Detail / Capability |
Notes / Description |
| Blind Thread Range |
M2, M2.5, M3, M4, M5, M6 |
Common metric sizes; unified custom available |
| Body Size Range |
OD: 3mm-10mm; Length: 4mm-15mm |
Blind depth customizable |
| Bottom Wall Thickness |
Min 0.5mm / Adjustable per injection pressure |
Ensures no leakage risk |
| Anti-Rotation Options |
External Knurling / Annular Grooves / Hex Profile |
Multiple options available |
| Material Options |
Lead-Free Eco Brass / C3604 Free-Cutting Brass |
Material certs provided |
| Recommended Process |
Insert Molding / Heat Staking |
Blind design suitable for both |
Product Applications
- Automotive Electronic Connectors: For sensor housings and ECU connectors where sealant or potting compound must be kept out of threads.
- Medical Device Enclosures: For monitor and diagnostic equipment housings requiring clean internal threads for sterilization readiness.
- High-End Consumer Electronics: For threaded connection points in smartphone frames and tablet back covers that must be used directly after insert molding.
Frequently Asked Questions
Can you handle complex custom designs and provide design optimization suggestions?
Absolutely. This is our core expertise. We provide free DFM analysis within 3-5 days, often helping clients achieve 15-30% cost reduction through design for manufacturability.
How do you ensure quality consistency and handle defect issues?
We implement a rigorous 4-stage QC system with 100% full inspection. Our track record shows 99.99% qualification rate.
What are your lead times and how do you handle urgent orders?
Standard lead times: 3-7 days for prototypes, 7-15 days for mass production. We offer VIP prioritization cutting lead times by up to 30%.
Will I get timely responses and professional support throughout the project?
Yes. You get a 1v1 exclusive consultant with 1-hour initial response commitment and 24-hour technical support.
Can you provide material certifications and environmental compliance reports?
Yes. We provide material certifications and environmental test reports (RoHS, REACH compliant) upon request.
How do you protect my designs and intellectual property?
We start with mutual NDA and implement strict mold ownership protection and confidential data security measures.
What are your payment terms and MOQ requirements?
We offer flexible payment terms (T/T, L/C at sight) and MOQ from 1 piece for prototyping.
