Phillips Pan Head Sems Machine Screws Double Washer Flat And Spring
What different users need from sems screws
Different jobs call for different features. Here is how sems screws fit three common user profiles.
This person cares about speed. Every second counts. Hundreds of screws per shift. Picking up a screw and a washer separately slows things down. Sems screws cut that step. One part. One motion. Faster assembly.
This person takes things apart and puts them back together. Washers fall off regular screws during disassembly. They drop into machines. They get lost on the floor. Sems screws keep the washer captive. It stays on the screw. No lost parts. No searching.
This person specifies components for new products. They need consistent performance. No surprises. Sems screws deliver the same clamping force every time. The washer type is matched to the application.
Which washer solves which problem
| If your problem is... | Choose this washer |
|---|---|
| Screws loosening from vibration | Spring washer |
| Surface damage from uneven clamping | Flat washer |
| Severe vibration and rotation | External tooth lock washer |
| Clean appearance with no snagging | Internal tooth lock washer |
| Both vibration and pressure issues | Double washer (spring + flat) |
Two head styles for two types of work
For screwdrivers. General assembly. Most common choice.
For wrenches and sockets. Higher torque. Industrial applications.
Materials at a glance
- 304 stainless steel. Rust resistant. Outdoor and wet areas.
- 316 stainless steel. Extra protection. Saltwater and marine.
- Zinc plated carbon steel. Strong and budget friendly. Indoor and light outdoor.
Sizes and strength grades
M3, M4, M5, M6. Lengths 6mm to 30mm. Grade 8.8 for most work. Grade 10.9 for heavier loads. Grade 12.9 for maximum strength.
What our customers say
Q&A
A: Production lines, maintenance shops, and OEM manufacturers. Anyone who assembles products with screws and washers.
A: Yes. They work with standard screwdrivers and power drivers.
A: Yes. The washer stays on the screw. You can remove and reinstall multiple times.
A: Spring washer. It is the most common choice for general assembly and anti vibration.
A: The unit cost is slightly higher, but you save on assembly time and reduce inventory complexity.
A: Yes. Send us your drawing or sample. OEM orders accepted.
YH Fastener has been making fasteners since 1998. Our range includes sems screws, self tapping screws, machine screws, shoulder screws, and custom fasteners. ISO 9001 and ISO 10012 certified. Every batch inspected. Factory direct. Ship to 60+ countries.
