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You want a screw that sits flush. Nothing sticking out to catch clothing or scratch surfaces. Flat head with coarse thread and zinc plating. The coarse thread bites fast into wood. The flat head sinks below the surface. Countersunk gives you an even cleaner finish.
Plastic cracks easily if you are not careful. Wafer head spreads the clamping force over a wider area. Thread forming screws push material aside instead of cutting it. No chips. No stress cracks. Brass or stainless steel gives you good corrosion resistance without adding weight.
Heavy loads. Constant vibration. Outdoor exposure. Hex head lets you apply high torque with a wrench. Coarse thread holds firm in wood flooring. Galvanized coating stands up to moisture and road salt.
Weather exposure. Sun. Rain. Wind. 316 stainless steel gives you the best corrosion resistance. Flat head creates a clean appearance. Coarse thread grips the backing material securely.
| Material | Recommended head | Recommended thread | Recommended material |
|---|---|---|---|
| Thin steel | Pan | Fine | 304 stainless |
| Wood | Flat | Coarse | Zinc plated |
| Plastic | Wafer | Forming | Brass |
| Trailer floor | Hex | Coarse | Galvanized |
| Sheet metal | Pan | Fine | 304 stainless |
| Signage | Flat | Coarse | 316 stainless |
| Drywall | Flat | Coarse | Black oxide |
| Automotive trim | Wafer | Forming | 304 stainless |
| Head | When to use |
|---|---|
| Flat | You need a flush surface |
| Wafer | You need wide clamping on soft materials |
| Pan | General purpose assembly |
| Hex | You need high torque |
| Countersunk | You want the head completely hidden |
| Truss | You are working with thin or soft materials |
YH Fastener has been making precision fasteners since 1998. Our product range includes self tapping screws, machine screws, shoulder screws, and custom fasteners. We are ISO 9001 and ISO 10012 certified. Every batch is inspected before shipping. We sell factory direct and ship to over 60 countries.
Send us your drawing or sample. Let us know your quantity and material preference. We will reply with pricing within 24 hours. OEM and custom orders are welcome.
Yes for metal, plastic, and hardwood. The hole should be slightly smaller than the screw. For softwood, you can sometimes skip this step.
Hex head lets you apply the most torque. That gives you the strongest clamping force. Use a wrench or socket driver.
304 is good for general outdoor use. 316 adds extra protection against salt water and chemicals. Choose 316 for coastal areas or marine applications.
Yes. Choose thread forming screws with a wafer head. The head spreads pressure. The threads form without cutting. No stress cracks.
Fine thread. More threads per inch means better holding power in thin gauge material.
Yes. Send us your drawing or sample. We will manufacture to your specifications. OEM orders accepted.
