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As a responsible company, Lock Tech not only takes care of its employees but also contributes to social causes and environmental protection. We fully support the efforts, innovations, and visions of clean energy enterprises working towards a better future for our planet. As individuals, companies, and nations, the commitment to clean energy and sustainable development is part of everyday life, deeply connected to each of us.
We are committed to supporting sustainable energy solutions by providing products that enhance the performance, durability, and efficiency of renewable energy systems. Our wide range of fasteners and metal components is carefully designed to meet the stringent requirements of solar panel installations and wind turbine components. We prioritize quality and reliability, ensuring our products withstand environmental challenges and contribute to the long-term success of renewable energy projects.
Our team is innovation-focused, working closely with clients to develop custom solutions tailored to their specific needs. With strong R&D capabilities, we stay at the forefront of technology, continuously improving our products to align with industry advancements and sustainability goals. At Lock Tech, we are passionate about contributing to a cleaner, greener future. Partner with us to discover how our expertise in fasteners and metal components can support your renewable energy initiatives and drive your projects to success.
Our PresenceBased in China and Southeast Asia, we specialize in delivering reliable and durable fasteners that meet the diverse needs of automotive manufacturers, distributors, and service providers across the U.S., Europe, and Southeast Asia.
Who Are We?At Lock Tech, we take pride in our expertise in the automotive sector. With years of experience in manufacturing fasteners and metal components, we understand the critical role these products play in ensuring vehicle safety, performance, and longevity. Our skilled engineers and designers are dedicated to providing custom solutions to enhance your automotive applications, whether for OEMs or the aftermarket.
Why Choose Us?
Comprehensive Product Range: We offer a wide variety of fasteners and metal components designed specifically for automotive applications, ensuring you find the right product for every need.
Customization: Our flexible manufacturing capabilities allow us to customize fasteners and components to meet your specific requirements, helping you address the unique needs of your customers.
Commitment to Quality: Quality is at the core of our operations. We adhere to strict quality control processes and industry standards to ensure that all our products deliver outstanding performance and reliability.
Global Expertise: Our strategic focus on the U.S., Europe, and Southeast Asia gives us deep insight into regional market dynamics and compliance requirements, enabling us to serve our customers effectively.
Exceptional Customer Support: We believe in building strong relationships with our customers. Our dedicated customer support team is always ready to assist you, providing prompt responses, expert advice, and reliable service from inquiry to delivery.
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At Lock Tech, we have extensive experience serving mechanical design and R&D departments, structural design teams, and ODM clients. We are especially happy to work with these groups, getting involved from the R&D and design stages to ensure close collaboration at every step.
This early involvement allows for quicker sample responses, better understanding of product mechanical performance, and optimal equipment matching, all while keeping costs competitive. When dimensions align with standard parts, we prioritize them for cost efficiency. If not, we recommend higher-performance materials and provide guidance on mechanical standards, strength, surface treatment, and durability testing.
Collaboration and communication are key, ensuring each project meets your goals. We’re committed to supporting your manufacturing needs with a focus on quality and innovation, helping you succeed in the market. Let’s work together to turn your ideas into outstanding products.
As a trusted partner specializing in fastener and metal component solutions for mechanical manufacturing, we focus on product innovation, closely collaborating with clients to develop high-quality, customized products tailored to specific project needs. Our expertise in fasteners and metal components enables us to provide comprehensive ODM services, ensuring precise and efficient realization of your vision. From concept and design to prototype and mass production, our skilled engineers and designers use advanced technology and materials to create solutions that enhance performance and reliability.
Our Presence
We are a leading manufacturer based in China and Southeast Asia, delivering high-quality, customized fasteners and metal components for mechanical manufacturing, R&D centers, and ODM services. We are dedicated to providing solutions that drive innovation and reliability, especially for clients in the U.S., Europe, and Southeast Asia.
Who Are We?
Lock Tech focuses on designing and manufacturing fasteners and metal components to meet the unique needs of mechanical manufacturing and R&D departments. Our commitment to quality and innovation drives us to provide customized solutions that enhance product efficiency and performance. With years of industry experience and a forward-thinking approach, we collaborate with clients to bring their concepts to life, ensuring each fastener and component meets the highest standards of precision and durability.
Why Choose Us?
Expertise in Mechanical Manufacturing: We understand the challenges and demands of mechanical manufacturing and R&D. Our knowledgeable team provides the solutions you need to successfully advance your projects.
Customization Capabilities: We offer flexible manufacturing processes that allow us to customize fasteners and metal components to meet your specific designs and applications, ensuring precise fulfillment of your requirements.
Commitment to Quality: Quality is our top priority. We adhere to strict quality control protocols and international standards, ensuring our products are reliable and durable.
Strategic Location: Operating in China and Southeast Asia allows us to leverage cost-effective production while maintaining high product quality. Our focus on the U.S., Europe, and Southeast Asia ensures we understand these markets’ needs and regulatory standards.
Dedicated Customer Support: Our customer-centric approach ensures that you receive excellent support throughout the process. From initial consultation to post-sales service, our team is here to help you every step of the way.
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The automobile and aftermarket sectors are new experiences for us, introduced by our customer SMP (NYSE: SMP, Standard Motor Products), a publicly listed company with over 100 years of history and a leader in the automotive industry.
By serving similar automotive clients and established aftermarket customers, we gained valuable insights and received positive feedback. This high mix, low value-demand industry has a wide range of products and high-quality standards. It has driven us to not only improve efficiency and flexibility but also enhance our management capabilities and technical expertise.
We focus on providing high-quality fasteners and metal components for the automotive and aftermarket industries. Our products are essential for vehicle manufacturing and maintenance, ensuring safety, durability, and performance. With our expertise in precision engineering and a commitment to excellence, we offer reliable solutions that meet the stringent standards of the automotive industry, supporting OEMs (Original Equipment Manufacturers) and aftermarket service providers in delivering top-tier products to the market.
Our PresenceBased in China and Southeast Asia, we specialize in delivering reliable and durable fasteners that meet the diverse needs of automotive manufacturers, distributors, and service providers across the U.S., Europe, and Southeast Asia.
Who Are We?At Lock Tech, we take pride in our expertise in the automotive sector. With years of experience in manufacturing fasteners and metal components, we understand the critical role these products play in ensuring vehicle safety, performance, and longevity. Our skilled engineers and designers are dedicated to providing custom solutions to enhance your automotive applications, whether for OEMs or the aftermarket.
Why Choose Us?
Comprehensive Product Range: We offer a wide variety of fasteners and metal components designed specifically for automotive applications, ensuring you find the right product for every need.
Customization: Our flexible manufacturing capabilities allow us to customize fasteners and components to meet your specific requirements, helping you address the unique needs of your customers.
Commitment to Quality: Quality is at the core of our operations. We adhere to strict quality control processes and industry standards to ensure that all our products deliver outstanding performance and reliability.
Global Expertise: Our strategic focus on the U.S., Europe, and Southeast Asia gives us deep insight into regional market dynamics and compliance requirements, enabling us to serve our customers effectively.
Exceptional Customer Support: We believe in building strong relationships with our customers. Our dedicated customer support team is always ready to assist you, providing prompt responses, expert advice, and reliable service from inquiry to delivery.
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1. Customer Background and Project Overview
In mid-2024, a well-known automotive component manufacturer from Italy contacted our engineering team with a critical sourcing requirement:They needed custom stainless steel fasteners for high-performance automatic transmissions used in electric vehicles (EVs).
These fasteners had to perform reliably under extreme vibration, high torque, and elevated temperatures, where standard off-the-shelf bolts could not maintain structural integrity.
The customer’s main challenge was finding a CNC machining supplier capable of producing tight-tolerance fasteners with controlled surface finishes and consistent mechanical performance across large batches.
With over a decade of experience in precision CNC machining and custom fasteners manufacturing, our company — [Your Company Name] — became their trusted partner for developing, testing, and mass-producing these critical components.
2. Project Requirements and Challenges
After the first technical meeting and review of the CAD drawings, several key challenges were identified:
High material performance:The fasteners required AISI 304 and 316 stainless steel, each with specific mechanical and corrosion-resistance properties.
Dimensional accuracy:The hex socket head and threaded section required tolerance control within ±0.01 mm for accurate torque application.
Surface finish quality:The automotive client specified a Ra ≤ 0.8 µm finish to prevent micro-cracks under vibration stress.
Thread precision:The M8 x 1.25 thread had to pass both GO/NOGO and 3D scanning validation to meet ISO 965-2 standard.
Corrosion and fatigue resistance:The parts were used near the transmission casing, where oil, heat, and moisture exposure were constant.
These strict requirements made the project highly technical and demanding — a challenge our CNC and materials engineering teams were well-prepared to handle.
3. Engineering & Production Solution
Our team proposed a multi-phase engineering solution, beginning from DFM analysis to pilot production and quality validation.
a. Material Selection and Testing
We selected AISI 316 stainless steel for its superior corrosion resistance in high-temperature automotive environments.Before production, we performed spectrochemical analysis and mechanical property testing (tensile strength, hardness, elongation) to ensure material conformity.
Material hardness was maintained at HV 230–260, providing the perfect balance between machinability and strength.
b. DFM & Process Optimization
Our engineers reviewed the part geometry and optimized the manufacturing process:
Recommended slight adjustments to undercut depths for better tool reach.
Simulated machining using MasterCAM to reduce unnecessary tool changes.
Implemented a two-step threading process (turning + thread rolling) to improve thread fatigue life by 20%.
This stage reduced production cycle time by 18%, improving both cost efficiency and throughput.
c. Precision Machining Process
The custom fasteners were produced using CNC turning centers (Tsugami TMA8F) combined with Swiss-type lathes for high accuracy.
Machining Step
Process Details
Turning
Achieved outer diameter precision within ±0.005 mm
Thread Rolling
ISO M8 × 1.25 pitch, after heat treatment
Drilling
Depth tolerance ±0.02 mm
Head Milling
Controlled with live tooling spindle
Deburring
Automatic chamfering tool for edge consistency
Each machine was programmed and monitored by skilled technicians to ensure stable output over long runs.
4. Heat Treatment and Surface Finishing
After machining, the fasteners underwent controlled heat treatment to relieve residual stress and enhance tensile strength.
Heat treatment condition: 420°C for 2 hours, air-cooled.
Surface treatment: Passivation per ASTM A967, improving corrosion resistance in oil-contact environments.
Optional coating: Nickel plating for aesthetic appeal (per client request on secondary batch).
Surface roughness after treatment remained at Ra 0.7 µm, and the coating adhesion was tested via ASTM D3359 (Grade 5B).
5. Quality Control and Inspection
Quality assurance is the backbone of our CNC machining operations.For this project, every stage of production followed a documented PPAP (Production Part Approval Process) and SPC (Statistical Process Control) procedure.
Key Inspection Procedures:
Incoming Material Verification
Spectrometer analysis and mechanical certification from supplier.
In-Process Control (IPQC)
Thread pitch and concentricity inspected every 20 pcs.
Automatic optical measurement for head diameter and undercut.
Final Inspection
100% visual inspection for surface defects and burrs.
CMM measurement for random samples (batch size 200 pcs).
Salt spray corrosion test for 48 hours (passed without rust).
Torque and tensile testing with digital torque gauge.
Each inspection record was logged into our MES (Manufacturing Execution System) for traceability and shared with the client during shipment.
6. Project Results and Customer Feedback
The first batch of 5,000 custom stainless steel fasteners was delivered within four weeks — two weeks ahead of schedule.After testing and validation, the client reported outstanding performance metrics:
Torque consistency: ±2% variance across samples.
Zero defects: No burrs or thread failures reported during assembly.
Corrosion resistance: Maintained integrity after 96-hour exposure test.
Dimensional accuracy: 100% parts within drawing specification.
Batch repeatability: Consistent results across 5 consecutive shipments.
“We have worked with several suppliers before, but none provided the level of precision and communication your team did. Your CNC fasteners exceeded our expectations in both performance and reliability.”— Procurement Director, Italian EV Transmission Manufacturer
Encouraged by these results, the client extended the partnership for additional custom threaded inserts and titanium bolts for their next EV platform.
7. Technical Achievements and Capabilities Demonstrated
This project fully utilized our company’s advanced CNC machining capabilities and strict quality management system.
Capability
Specification
Tolerance
Up to ±0.005 mm
Thread Standard
ISO 965-2 / DIN 13
Material Used
AISI 304, 316, 17-4PH
Surface Finish
Passivation, Nickel Plating, Black Oxide
Inspection Tools
Mitutoyo CMM, Profile Projector, Thread Gauge, Torque Tester
Certifications
ISO 9001:2015, IATF 16949, RoHS, PPAP Available
We also implemented a digital inspection workflow using barcode tracking, ensuring full visibility of every production stage — from raw material to packaging.
8. Packaging and Logistics
Given the sensitivity of surface finishes and thread quality, our packaging process was designed with care:
Each fastener was separated by anti-scratch foam dividers.
Vacuum-sealed in groups of 50 pcs with silica gel packets.
Export-grade cartons labeled with QR codes for batch traceability.
All shipments were handled via DHL Express and sea freight, depending on customer urgency.
Lead time for standard reorders: 10–12 working days.
9. Broader Application and Industry Value
Following this successful project, similar custom stainless steel fasteners have been applied to:
EV Powertrain Systems(Battery case bolts, inverter housing screws)
Heavy-Duty Machinery(Vibration-resistant locking bolts)
Marine Equipment(Anti-corrosion threaded connectors)
Industrial Robotics(Precision alignment pins and torque fasteners)
This showcases how our CNC machining expertise and material knowledge allow us to support various industries where strength, reliability, and precision are essential.
10. Why Choose [Lock Technology(shenzhen)Co.,LTD]
Expert in Custom Machined Fasteners
17+ years of experience manufacturing stainless steel, titanium, and alloy fasteners.
Advanced Equipment Fleet
Swiss-type lathes, 5-axis centers, automatic thread rollers.
Quality Without Compromise
Certified ISO 9001 / IATF 16949 with full inspection documentation.
Flexible Order Volume
Prototype to mass production, no MOQ limit.
Global Customer Trust
Clients in Europe, USA, Japan, and Australia across automotive and robotics sectors.
11. Conclusion
This Custom Stainless Steel Fasteners Case Study exemplifies how a technical partnership and precision machining expertise can transform complex engineering requirements into reliable, production-ready solutions.
Through the integration of CNC precision, quality control, and customer-focused engineering, [Lock Technology(shenzhen)Co.,LTD] successfully helped the client improve transmission reliability, reduce production time, and strengthen their EV product competitiveness.
Whether you require custom bolts, nuts, shafts, or non-standard precision fasteners, our engineering team can deliver tailored CNC machining solutions that meet your toughest requirements — every time.
[Lock Technology(shenzhen)Co.,LTD] — Precision You Can Trust, Performance You Can Measure.
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Meta Title: Custom Stainless Steel Fasteners for Automotive Transmission | CNC Machining Case Study
Meta Description: Learn how our CNC machining experts delivered high-precision stainless steel fasteners for automotive transmission systems with ±0.005 mm tolerance and zero defect rate.
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CNC Machining Services
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Automotive Components Manufacturing
In order to ensure the normal operation of the equipment, regular maintenance of special screws, which are insignificant small components of the equipment, is very necessary. Given the importance of special screws, it is important to pay attention to that aspect during maintenance in order to prevent problems with special screws.
Special screws
1、 Remove debris
Special screws need to be cleaned with silicate after quenching, and after cleaning, they also need to be washed with water. So to prevent residues and debris from appearing, it is important to be very careful when washing.
2. Special screws stacked and damaged
We sometimes encounter situations where special screws change color after being heated, and after soaking in ether, oily residue is found, indicating that the surface of the special screw is not clean. After analysis, it was found that this was due to improper stacking of special screws during heating, resulting in slight oxidation in the quenching oil.
3. Surface residues
Failure to clean high-strength screws with an acid cleaning machine and insufficient inspection of the rinsing tank can result in white residue on the screws, which was found to be phosphide after the first phase inspection.
4. Alkali burn
If a special steel screw enters the quenching oil without removing the surface alkaline substances, it will be found that the screw will turn black due to quenching waste heat and have a uniform and flat oil black outer surface. Because the screws that were not cleaned were burned on the surface at high temperatures, and the damage worsened during tempering. So before heat treatment, it is necessary to thoroughly clean the alkaline residue that may cause burns on special screws.
5. Improper rinsing
Sometimes it is found that when using polymer aqueous solution for quenching large-sized special screws, while using an alkaline cleaning machine for rinsing, the special screws have already rusted during internal testing. So to ensure that special screws do not rust during rinsing, it is necessary to frequently change the rinsing water.
6. Excessive corrosion
The excessive aging of quenching oil will leave some black stripes when high-strength special screws are dried, which is the residue of surface residue, which is the evolution of the gas phase during the quenching process. So it is recommended to add new oil.
Prev
Iron special screws are prone to rusting in damp environments. To prevent rusting, special screws need to be moisture-proof and moisture-proof. The following is an introduction to the moisture-proof and moisture-proof methods for special screws:
(1) Vibration machinery, try to use solvent-free paint as much as possible.
(2) It is best to choose impregnating paint without oxidation components, such as epoxy urethane based or unmodified epoxy based impregnating paint.
Special screws
(3) When using melamine acid impregnating paint, the curing temperature and curing time should be adjusted. The curing temperature should be slightly higher than 130 ℃ (such as 135 ℃) and the curing time should be greater than 180 minutes. The process must be strictly followed, especially in high temperature and humid seasons. From the perspective of rust prevention, the drying (curing) time specified in the paint factory's samples may not be sufficient, and the motor has a specific internal shape.
(4) Use paint that does not contain volatile acids.
(5) Choose a paint with good hydrolysis resistance.
1.Selection of suitable materials
Graded Carbon Steel
Stainless steel
Easily Machined Steel
2.Optimal process arrangement
Cold Heading
Multi-Stage Processing
Complex Geometry Turning and Milling Process
3.Selection of suitable surface treatment
Salt Spray Corrosion Resistance Requirements
Coloration Technique
Tin Melting Conductivity Requirements
4.Suggestions on reasonable mass production
Dimensional Tolerance
Surface Roughness
Screw Locking Application
5.According to customer requirements
Prototype Sample
Quality Plan
PPAP
6.Quality performance test
Hardness
Breaking Torque
Tensile Strength
