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The head is flat on top and flat on the bottom. The sides are rounded. This shape gives you a wider contact area than other head styles. When you tighten the screw, the pressure spreads out evenly. You get a firm hold without digging into the material.
| Situation | Why it fits |
|---|---|
| You need even clamping force | The flat underside spreads the load |
| The material is soft | Less chance of surface damage |
| You are doing general assembly | Works for most everyday jobs |
| You want a clean look | Flat top with rounded sides looks neat |
| Torque is not critical | Works fine with standard drivers |
| Drive | Tool | Good for |
|---|---|---|
| Phillips | Phillips screwdriver | Everyday use, common tool |
| Slotted | Flat blade screwdriver | Light duty, simple jobs |
| Hex socket | Allen key | Higher torque, tighter spaces |
| Torx | Torx driver | Maximum torque, no slip |
| Material | Good for |
|---|---|
| 304 stainless | Outdoor, wet areas, rust protection |
| 316 stainless | Boats, saltwater, chemical exposure |
| Brass | Electronics, non-magnetic, looks good |
| Zinc plated steel | Budget work, light outdoor use |
| Aluminium | Lightweight, non-magnetic |
| Grade | Strength | Good for |
|---|---|---|
| 4.8 | 400 MPa | Light duty jobs |
| 6.8 | 600 MPa | Medium loads |
| 8.8 | 800 MPa | Industrial work |
| 10.9 | 1000 MPa | High strength needs |
| 12.9 | 1200 MPa | Critical fastening |
YH Fastener has been making precision fasteners since 1998. We produce pan head machine screws, self tapping screws, shoulder screws, and custom fasteners. ISO 9001 and ISO 10012 certified. Every batch checked. Factory direct. Ship to 60+ countries.
Send us your drawing or sample. Tell us what size, material, and quantity you need. We will get back to you within 24 hours. OEM and custom orders welcome.
Pan head is flat on top and flat underneath. Round head is domed. Pan head gives you more clamping area.
Yes. They are machine screws. They do not cut their own threads. Use a tapped hole or a nut.
Phillips. It is the standard. Most people have Phillips screwdrivers.
304 or 316 stainless steel. 316 is better near salt water.
It is the strength grade. 8.8 means about 800 MPa tensile strength.
Yes. Send us your drawing. We make what you need.
