Adapter washer used to fill the recess of the type AF high Friction Clamp. Additionally it features two projections which, when the AFW is inverted, will captivate the larger hexagons of 10.9 bolts.(M12 to M20 only). Note: The Type AFW is used to fill the recess in the Type AF to convert it into a flat top clamp to enable the bolt head or nut to be rotated. The Type AFW is also required when using pre-loadable bolts to BS EN 14399 due to their larger hexagon heads.