1.Wave washers resist loosening through vibration rely on elastic force.2.Carbon steel providing good strength, hardness and abrasion performance.3.Suitable for M21 thread screws.4.Washers are normally used to distribute loads of threaded bolts, screws and nuts evenly as the fastener is tightened.5.Intended for the general use under the head of a bolt or nut.Specification:Product Name: Wave WasherPackage Content: 40pcs x Wave WasherMain Color: BlackMaterial: Carbon SteelWeight: 15gHole Dia.: 21mm/0.83-inchOuter Dia.: 27mm/1.06-inchTotal Height: 3mm/0.12-inchThickness: 0.4mm/0.16-inchWave Number: 3
