This page lists washer grade 140HV with hardness 140–230 HV, bearing limit 400 MPa. Hardness describes resistance to indentation and is the primary acceptance figure for a washer grade; the bearing limit is the pressure the washer is expected to carry under the bolt head or nut.
Compare these figures with the loads in your own design calculation rather than with other grades in isolation. Where a value is not defined for the class, this library shows a dash rather than an estimate.
In this library the class is listed against DIN125 and ISO7089. Property classes are defined per product standard, so confirm the class marking and the standard's own table before releasing a batch or accepting a certificate.
The design verification rules below are a checklist for a specific joint: 6 rules covering the checks that matter most for this class.
The factor of safety and the acceptable preload still have to come from your project's engineering requirements. Related pages: mechanical properties hub, fastener materials and surface treatment.