EXTERNALLY THREADED FASTENING SYSTEMS
SEMS
Our captured washers improve productivity, eliminate lost, dropped or forgotten washers and simplify purchasing and inventory control.
Many fasteners are available as assemblies with captivated washers, collars, specialized stampings or other components. Engineered assemblies, which combine metal, plastic and other components into one subassembly, are also available. Captured washers improve productivity, eliminate lost, dropped or forgotten washers and simplify purchasing and inventory control.
- Features
One piece screw and washer assembly
Able to provide a larger bearing surface area than a one piece cold formed part
Able to provide a screw and washer assembly with dissimilar material - Benefits
Easier and quicker production line assembly over a separate washer and screw
Combines two part numbers into one
Provides a more consistent torque/tension relationship
Distributes the load over a large bearing surface reducing potential joint yielding - Specifications
Available for M1.2(#0) through M20(¾) thread sizes - Washer Types Available
Conical
Square Dome
Crest Cup®
External Tooth
Internal Tooth
Combination External/Internal Tooth
Flat
Countersunk
Non-Metallic
Square
Sealing
Multiple
Special
- Features
Large head-to-shank ratios possible
Uninterrupted grain flow
Parts can be formed to net or near-net shape, which requires fewer secondary operations to achieve the final shape - Benefits
Improved strength and reliability through work hardening and an uninterrupted grain flow
Improved surface finish over screw-machined components
Reduced scrap rates
High production rates
Increased strength and lowered costs over screw machined components - Specifications
Available for M0.5(#0000) through M38(1½) thread sizes - Materials Available
Low Carbon Steel
Medium Carbon Steel
Alloy Steel
Tool Steel
Copper
Brass
Bronze
Aluminum
Stainless Steel
Titanium
Waspalloy
Inconel
Others available on request