Custom Security Screws & Tamper-Resistant Fasteners
Engineered for infrastructure protection. We provide 0.05mm precision tamper-resistant screws with custom drive designs and 10-day rapid prototyping.
Product Introduction
Industry pain points and background
Assembling electric motors, generators, and heavy-duty industrial equipment requires fastening solutions that can span deep housings while maintaining perfect alignment. Standard long bolts often suffer from bending, poor concentricity, or inadequate tensile strength, leading to motor vibration, rotor friction, or catastrophic failure under load. You need precision-engineered long fasteners that guarantee absolute straightness and robust structural integrity.
Core Product Details
Guanbiao specializes in the manufacturing of custom eccentric screws, cam pins, and alignment hardware. Utilizing a highly cost-effective hybrid manufacturing process—combining multi-station cold forging for core strength with advanced CNC machining for the offset axis—we achieve exact eccentric geometries. Designed specifically for smart security systems and premium aluminum windows, our eccentric pins ensure precise mechanical positioning, zero-wobble rotation, and exceptional load-bearing capacity.
Key Features
1: Exceptional Concentricity & Straightness
Prevents motor vibration and rotor friction
2: Extra-Long Custom Dimensions
Engineered to span deep motor and generator housings
3: High-Tensile Load-Bearing Strength
Grade 8.8 to 12.9 options for heavy-duty industrial use
4: Custom Grip Lengths & Partial Threads
Optimized for precise alignment and shear strength
5: Anti-Loosening & Vibration Resistant
Maintains torque under dynamic rotational loads
Product Showcase
Material Capabilities
Materials We Work With
Mechanical Testing
High-Tensile Carbon Steel (Grade 8.8, 10.9, 12.9); Stainless Steel (304, 316 for non-magnetic & anti-rust needs); Alloy Steel; Brass.
Material Strategy
Long screws in motors endure constant mechanical stress and vibration. We source premium-grade raw materials with excellent fatigue resistance to prevent snapping or stretching under dynamic loads. All materials are RoHS/REACH compliant with full Material Test Certificates (MTC) provided.
Surface Finishes
Surface Finishes for Anti-Friction & Weatherability
Zinc Plating (Clear/Yellow/Blue)
Standard, cost-effective rust protection for internal motor components and dry environments.
Dacromet / Zinc-Nickel
Superior salt-spray and weather resistance for outdoor industrial motors, generators, and EV powertrains.
Black Oxide
A thin, anti-reflective coating that maintains precise dimensional tolerances for tight motor assemblies without adding thickness.
Anti-Loosening Patches (Nylok)
Applied directly to the threads to prevent loosening caused by the high-frequency vibrations inherent in motor operation.
Technical Capabilities
Manufacturing Capabilities & Tolerances
| Max Part Size | Custom extended lengths up to your specific motor housing depth requirements. |
| Tolerances | Strictly maintained straightness and concentricity to ± 0.05mm. |
| Capabilities | Specialized Cold Heading for Long Parts + Precision Thread Rolling. |
| MOQ | Flexible / Small-Batch Trial Supported. |
Why Choose Us
Advantage 1
Advantage 2
Advantage 3
Advantage 4
Featured Projects
Typical Eccentric Fastening Applications
Project 1
● Project Name: Project Name: Industrial Servo Motor Assembly
● Challenge: The client's previous supplier provided long bolts that bent slightly during installation, causing the rotor to rub against the stator and creating severe vibration issues.
● Solution: We manufactured custom Grade 10.9 through-bolts with strict ± 0.05mm straightness control and a specialized unthreaded grip length, eliminating the vibration and saving the client's assembly yield rate.
Project 2
● Project Name: Outdoor Generator Housing Securing
● Summary: Supplied extra-long, high-tensile Dacromet-coated screws for heavy-duty outdoor generators. The fasteners provided immense structural clamping force while passing rigorous 720-hour salt spray testing for extreme weather durability.
Applications
Electric Motors & Servos
Generators & Power Equipment
Public Facilities
Industrial Machinery
FAQ
We use specialized multi-station cold heading machines designed specifically for extended lengths. Combined with strict material selection and 100% optical straightness verification, we guarantee absolute concentricity.
Yes. We can customize the exact thread length and the unthreaded grip length (shank) to provide maximum shear strength and precise alignment for your specific housing depth.
For heavy-duty industrial motors, we typically recommend high-tensile carbon steel heat-treated to Grade 10.9 or 12.9 to ensure it can withstand immense clamping force without stretching or breaking.
Yes. We are small-batch friendly. We understand that developing new motor sizes requires testing, and we offer flexible MOQs to support your initial R&D and trial production phases.
Absolutely. To combat the high-frequency vibrations inherent in motors, we can pre-apply Nylok or other thread-locking patches to ensure the screws never loosen during operation.