Custom Machine Screws: Assembly-Ready Fastening Solutions
- Machine Screws
At Cheng Hao we build fasteners around your designs, combining the right dimensions, head styles, materials, and coatings so the screw fits your working conditions, your assembly line, and your quality requirements from the first batch.
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We produce machine screws to all the major international standards, including DIN, ISO, JIS, BSW, IFI (Industrial Fasteners Institute), and UTS (Unified Thread Standard, controlled by ASME/ANSI in the United States).
Four Manufacturing Tiers for Every Application
We group our machine screw capabilities into four tiers by size, load, and performance, so it is easy to match the right screw to your job.
- Micro Precision (M0.6 to M2.0): Micron-level accuracy and stable clamping force for tight spaces like optical modules, instrumentation, and internal hardware. See our Micro Screws page.
- High-Strength Precision Structural (M2.0 to M5.0): Our core strength. These handle high driving torque and heavy structural load in small sizes, without slipping or breaking during assembly.
- Standard Assembly Integration (M2.0 to M5.0): Built to speed up automated assembly and cut your total cost of ownership, including our SEMS Screws with captive pre-assembled washers.
- Heavy-Duty and Positioning (M5.0 to M12): Anti-rotation T-Head Screws and high-grip knurled cup point Socket Set Screws for heavy loads, high torque, and constant vibration.
Cold-Forged Drive Sockets That Resist Stripping
We cold-forge our drive sockets, including T6 and T20 Torx, in one piece rather than cutting them. Forging keeps the metal fiber flow lines running through the head, which gives the socket better concentricity and far more resistance to corner cracking than a drilled-and-broached socket. In practice, that means the screw takes high driving torque without stripping or camming out on your line.
Premium Materials Matched to Load and Environment
We choose material by application to guarantee performance.
Alloy steel (SCM435): Our go-to for high-strength structural fasteners. Once quenched and tempered, it reaches Grade 10.9 and 12.9 hardness, with the tensile strength, impact toughness, and fatigue resistance demanding jobs need.
Carbon steel: Low and medium carbon options that machine easily and keep costs down for everyday machinery and hardware.
Stainless steel (SUS304, SUS316): The corrosion-resistant choice for humid, high-cleanliness, or harsh outdoor conditions.
Advanced Finishes and Functional Coatings
Our finishing line is where an ordinary screw becomes an assembly-ready one.
Trivalent black zinc plating (≥5μm): Eco-friendly corrosion protection with a clean matte black finish. We control the coating thickness tightly so fine Torx sockets and precision threads never clog with zinc.
Mandatory dehydrogenation baking: On high-strength alloy steel at Grade 10.9 and above, we bake within the critical window after plating to remove the hidden risk of delayed hydrogen embrittlement fracture.
Pre-applied threadlocking (Precote 85-8 / PC85-8): A micro-encapsulated threadlocker we apply before shipping. The capsules burst and cure only when the screw is installed, so you skip manual gluing and keep automated suction-nozzle lines running.
Black oxide for micro tiers: Standard blackening for M0.6 to M2.0 stainless micro screws that resists flaking while holding tight tolerance.
Built to Your Specification
Mix and match head style, material, and finish to build the exact fastener your application calls for. New to machine screw selection? Start with our Machine Screws 101 guide. Ready to source? Contact us for a quote.
Frequently Asked Questions
1. What sizes of machine screws can you produce?
We manufacture across the full range, from M0.6 micro screws right up to M12 heavy-duty fasteners. That spans all four of our manufacturing tiers, so whether you need a tiny screw for an optical module or a high-load structural fastener, we can cover it from one supplier.
2. What standards do your machine screws meet?
We build to all the major international standards, including DIN, ISO, JIS, BSW, IFI, and UTS (controlled by ASME/ANSI in the United States). If your project follows a specific standard, let us know and we will match your drawings and tolerances exactly.
3. What is the highest strength grade you offer?
Our top grades are 10.9 and 12.9, made from SCM435 alloy steel. We reach these through precise quenching and tempering, giving you the high tensile strength, toughness, and fatigue resistance that heavy structural and high-torque applications demand.
4. Do you offer pre-applied threadlocking?
Yes. We apply Precote 85-8 (PC85-8), a micro-encapsulated threadlocker, before the screws ship. The capsules cure only when the screw is installed, so you can drop manual gluing from your process and keep automated assembly lines moving at full speed.
5. How do you prevent hydrogen embrittlement on high-strength screws?
For any fastener at Grade 10.9 and above, we run mandatory dehydrogenation baking within the critical window straight after plating. This drives out absorbed hydrogen and removes the hidden risk of a delayed fracture once the screw is under load.
6. Why are cold-forged sockets better than cut sockets?
Cold forging keeps the metal fiber flow lines running through the head instead of cutting across them. That gives you stronger socket walls, better concentricity, and far more resistance to stripping and corner cracking, especially on fine Torx drives under high torque.
7. Can you supply SEMS screws with captive washers?
Yes. Our SEMS screws come with a pre-assembled captive washer that holds clamp load and resists loosening under vibration. Because the washer cannot fall off or get left out, they also speed up assembly and reduce errors on the line.
8. What head styles do you offer?
We produce socket head cap (SHCS), flat head countersunk (FHCS), and button head (BHCS), along with functional types like SEMS, T-head, and set screws. If your design needs a specific drive or head profile, we can build to it.
9. What is the difference between your four manufacturing tiers?
The tiers group screws by size and load: Micro Precision (M0.6 to M2.0), High-Strength Precision Structural (M2.0 to M5.0), Standard Assembly Integration (M2.0 to M5.0), and Heavy-Duty and Positioning (M5.0 to M12). The tiers make it easy to find the right fastener for your job.
10. Can you produce fully custom machine screws?
Absolutely. You mix and match head style, material, and finish against your own blueprint, and we produce a small sample batch for your approval before we commit to bulk production. That way you confirm the fastener is right before the full run begins.
