Zinc Plated Steel Hex Head Machine Screws Coarse Thread For Machinery Assembly
What sets machine screws apart from other fasteners?
They do not create their own threads. Instead, they rely on existing threads in a tapped hole or a nut. That is the key difference. Self tapping screws cut threads. Machine screws engage with threads already there.
Why choose machine screws?
Consistent clamping force. You get the same tension every time. Easy disassembly. You can take them apart without damaging the threads. Precision fit. The thread profile matches standard taps and dies. Versatile. One screw works across many applications.
Decision 1 – Head style
| Head style | When to pick it |
|---|---|
| Pan | General purpose, most common, wide bearing surface |
| Flat | Sits flush with the surface, 82 degree countersink |
| Hex | Wrench drive, high torque capability |
| Button | Low profile dome, clean appearance |
| Cheese | Straight sides, good for tight spaces |
| Truss | Wide head, spreads load on soft materials |
| Round | Simple dome, general assembly |
| Fillister | Higher head, deeper screwdriver engagement |
| Oval | Countersunk with rounded top, decorative finish |
Decision 2 – Drive type
| Drive | When to pick it |
|---|---|
| Phillips | Everyday use, screwdriver stays centered |
| Slotted | Simple design, light duty applications |
| Hex socket | Allen key drive, high torque, tight clearance |
| Torx | Maximum torque transfer, no cam out |
Decision 3 – Material
| Material | Where to use it |
|---|---|
| 304 stainless | Outdoor, damp environments, general rust protection |
| 316 stainless | Marine, coastal, chemical exposure |
| Brass | Electronics, non-magnetic, decorative appearance |
| Steel | Cost effective, general industrial, zinc plated |
| Aluminium | Lightweight, non-magnetic, weight sensitive |
| Bronze | Marine, corrosion resistant, bearing applications |
| Copper | Electrical conductivity, grounding |
Decision 4 – Strength grade
| Grade | When to pick it |
|---|---|
| 4.8 | Light duty, general assembly |
| 6.8 | Moderate loads, higher clamping force |
| 8.8 | Industrial, heavy duty applications |
| 10.9 | High strength, demanding environments |
| 12.9 | Critical fastening, maximum strength |
Where are they used?
Electronics enclosures, PCB mounting, machinery assembly, automotive components, marine equipment, instrument panels, furniture, appliances, and general mechanical construction. Anywhere you have a pre tapped hole or use a nut.
Quality
ISO 9001 and ISO 10012 certified. Every batch inspected. Thread gauging, dimensional checks, hardness testing.
Custom
Non-standard sizes, special head markings, or unusual materials? Send us your drawing. We manufacture to your specification. OEM orders accepted.
- Fully threaded design
- Requires pre tapped hole or nut
- Pan, flat, hex, button, cheese, truss, round, fillister heads
- Phillips, slotted, hex socket drives
- 304 SS, 316 SS, brass, steel, aluminium, bronze, copper
- M2 to M6, Class 4.8 to 12.9
YH Fastener has been manufacturing precision fasteners since 1998. Our range covers machine screws, self tapping screws, shoulder screws, and custom fasteners. ISO 9001 and ISO 10012 certified. Every batch inspected before shipping. Factory direct pricing. We ship to over 60 countries worldwide.
Need a quote? Send us your drawing or sample. Tell us your quantity and material requirement. We will get back to you within 24 hours. OEM and custom orders welcome.
FAQ
What is the difference between a machine screw and a regular screw?
Regular screws like wood screws or self tapping screws create their own threads. Machine screws need a pre tapped hole or a nut.
Do I need a tapped hole or can I use a nut?
Either works. If you have a tapped hole, drive the screw directly in. If you have a nut, put the nut on the other side and thread the screw through.
What is the most common head style?
Pan head. It is the standard choice for most assembly work.
What is the best material for outdoor use?
304 or 316 stainless steel. 316 gives you extra protection against salt and chemicals.
What does Class 8.8 mean?
It is a strength grade. Tensile strength is about 800 MPa. Suitable for most industrial applications.
Can I get custom sizes?
Yes. Send us your drawing or sample. We will make what you need.
What drive type is best for high torque?
Hex socket or Torx. Both handle high torque without stripping.