Washer attached screw SEMS fasteners pan head locking stainless steel

Washer attached screw is also known as SEMS screw. SEMS screw combines two separate parts into one pre-assembled, low-cost fastener. With washers under the head, SEMS screw is fast, permanent, and easily adaptable to many applications. Ever Hardware provides custom made machine screws and customizable packaging.

The Phillips screw drive was created by John P. Thompson, who after failing to interest manufacturers, sold his design to businessman Henry F. Phillips. Phillips is credited with forming a company (Phillips Screw Company), improving the design, and promoting the adoption of his product.  Phillips drive bits are often designated by the letters “PH”, plus a size code 0000, 000, 00, 0, 1, 2, 3, or 4 (by order of increasing size); the numerical bit size codes do not necessarily correspond to nominal screw size numbers.

Tool size Fastener size
0 0–1
1 2–4
2 5–9
3 10–16
4 18–24

Stainless steel does not readily corrode, rust or stain with water as ordinary steel does. However, it is not fully stain-proof in low-oxygen, high salinity, or poor air circulation environments. There are different grades and surface finishes of stainless steel to suit the environment the alloy must endure. Stainless steel is used where both the properties of steel and corrosion resistance are required.Stainless steels contain sufficient chromium to form a passive film of chromium oxide, which prevents further surface corrosion by blocking oxygen diffusion to the steel surface and blocks corrosion from spreading into the metal’s internal structure. Passivation occurs only if the proportion of chromium is high enough and oxygen is present.

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Category Washer Attached Screw
Finish Purification or As request
Type Machine-threaded or As request
Material Teflon/Brass/Stainless steel/carbon steel/Aluminum
Brand Ever Hardware
Place of origin China Mainland
Size option As request
Color Natural or as request

Washer attached screw SEMS fasteners pan head locking stainless steelEver Hardware Industrial Limited

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