High Torque Brass Knurled Insert Nuts
Custom Diamond Straight Thread Precision Fasteners
High Torque Brass Knurled Threaded Inserts for Demanding Plastic
Fastening Applications
Product Overview
In applications subjected to continuous vibration or high dynamic
loads, standard knurled nuts may rotate and loosen over time.
Tingfeng Hardware specializes in the design and manufacture of
high-torque brass inserts. By scientifically optimizing knurl tooth
angle, depth, and arrangement, we provide several times the
torque-out and pull-out resistance of standard parts. Whether
you're dealing with difficult-to-bond materials like glass-filled
nylon or connection points requiring frequent disassembly, we can
provide targeted knurl design solutions to ensure rock-solid
connections.
Technical Engineering
The retention force of an insert in plastic depends on the degree
of mechanical interlock between the knurl design and the plastic
melt. Standard knurls are often a "one-size-fits-all" compromise
that cannot maximize performance for specific plastics and
applications. Based on 15 years of precision manufacturing
experience, Tingfeng Hardware has established a comprehensive
"Knurl Performance Database" documenting torque and pull-out data
for various tooth parameters across different engineering plastics.
Our value lies in data-driven knurl engineering. When you ask "How to achieve >200N torque resistance in
PA66+GF30" or "How to prevent rotation in soft PP material," our
engineers leverage database knowledge and simulation analysis to
recommend or customize the optimal knurl solution—whether it's a
deeper diamond knurl, a helical knurl with increased lead, or an
annular groove design specifically for ultrasonic processes. We
don't just manufacture inserts; we deliver connection reliability solutions. Our factory's Japanese Citizen Swiss-type lathes and
multi-station forming machines ensure we can replicate these
optimized designs in volume with ±0.02mm precision. As an IATF16949
certified factory serving 2,000+ global clients with >90% repeat
orders, we have both the capability and experience to provide the
most reliable guarantee for your critical connection points.
Features & Advantages
| Feature | Advantage to You |
|---|
| Data-Driven Knurl Customization Engineering | We maintain a performance database of various knurl parameters in
different plastics. Rather than blind trial-and-error, we recommend
or design optimal tooth profiles based on data, ensuring target
torque and pull-out forces are achieved the first time. |
| Significantly Improved Torque & Pull-Out Strength | By optimizing parameters like tooth depth, pitch, and helix angle,
our custom knurl solutions can provide several times the torque-out
and pull-out resistance of standard generic knurls. |
| Special Designs for Difficult Materials | Expertise in solving insert retention issues in low surface energy
or high shrinkage plastics like glass-filled nylon, POM, and PP.
Offers dedicated solutions such as high-lead helical teeth and
progressive bite teeth. |
| Full-Process Support from DFM to Test Validation | Provides DFM analysis during design phase, and installation
parameter recommendations with push-out/torque-out test validation
during sampling phase, reducing your development risk. |
| 15 Years Precision Manufacturing Assurance | IATF16949 certified factory with 300+ machines ensures optimized
knurl designs are produced in volume with high precision and
consistency. |
Product Specifications
| Specification Item | Detail / Capability | Notes / Description |
|---|
| Customizable Knurl Types | Diamond / Straight / Helical / Cross / Annular / Custom Combination | Tooth height, pitch, helix angle adjustable |
| Pull-Out Resistance Ref | M3: ≥80N / M4: ≥120N / M5: ≥200N | Specific values depend on knurl and plastic; test data available |
| Torque-Out Resistance Ref | M3: ≥2N*m / M4: ≥4N*m / M5: ≥6N*m | Higher torque can be designed per requirement |
| Recommended Thread Sizes | M2, M2.5, M3, M4, M5, M6, M8 | Non-standard sizes made to print |
| Recommended Plastics | ABS, PC, PA6, PA66, PA66+GF, PBT, POM, PP, PEEK | Optimal knurl recommended per material |
| Performance Validation Test | Can provide torque/pull-out test reports in specified plastic
bosses | Quantitative verification of customization effect |
Product Applications
- High-End Sports Equipment: Threaded connection points subjected to high dynamic loads in
carbon fiber bike components, golf equipment, and premium fitness
gear.
- Precision Instruments & Measurement Devices: Fastening points requiring repeated disassembly for maintenance in
handheld spectrometers and portable measurement device housings.
- Drones & Aerial Models: High-strength, vibration-resistant threaded fastening for drone
frames and gimbal brackets.
Frequently Asked Questions
Q: Can you handle complex custom designs and provide design
optimization suggestions?
A: 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.
Q: How do you ensure quality consistency and handle defect issues?
A: We implement a rigorous 4-stage QC system with 100% full
inspection. Our track record shows 99.99% qualification rate.
Q: What are your lead times and how do you handle urgent orders?
A: 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%.
Q: Will I get timely responses and professional support throughout
the project?
A: Yes. You get a 1v1 exclusive consultant with 1-hour initial
response commitment and 24-hour technical support.
Q: Can you provide material certifications and environmental
compliance reports?
A: Yes. We provide material certifications and environmental test
reports (RoHS, REACH compliant) upon request.
Q: How do you protect my designs and intellectual property?
A: We start with mutual NDA and implement strict mold ownership
protection and confidential data security measures.
Q: What are your payment terms and MOQ requirements?
A: We offer flexible payment terms (T/T, L/C at sight) and MOQ from
1 piece for prototyping.
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