Description
90402A106 Steel Pan Head Screws with External-Tooth Lock Washer, 4-40 Thread, 1/4″ Long. The washer on these screws has sharp external teeth that dig into surfaces for maximum holding power and vibration resistance. Also known as Sems screws, the washer rotates freely but is permanently attached. They have a zinc plating that provides corrosion resistance in wet environments. Length is measured from under the head.
Thread Size4-40click to learn more about 4-40
Length1/4″
ThreadingFully Threaded
Head Diameter0.219″
Head Height0.080″
Washer
OD0.230″
Thickness0.018″
Drive StylePhillips
Drive SizeNo. 1
MaterialZinc-Plated Steel
HardnessRockwell B69
Tensile Strength60,000 psi
Screw Size Decimal Equivalent0.112″
Thread TypeUNC
Thread SpacingCoarse
Thread FitClass 2A
Thread DirectionRight Handclick to learn more about Right Hand
Head TypeRounded
Rounded Head StylePan
Rounded Head ProfileStandard
Screw FeaturesWith Washer
Locking TypeLock Washer
Washer TypeExternal-Tooth Lock
Washer MaterialZinc-Plated Steel
System of MeasurementInch
Specifications MetASME B18.13
Manufacturer: Electronic Components
MFG Part #: 90402A106
