A washer is picked by its form and its size, and the form is the job it does: Form A to DIN 125 is the everyday standard flat washer under most heads and nuts, Form C to BS 4320 runs a larger outside diameter that spreads the clamping load over soft, thin or slotted material, and the repair washer takes that idea further still, a wide penny of steel that bridges an oversized or worn hole back to sound metal.
The assortment cases carry the whole working spread, the 1,070 piece Form A box running M5 to M16 and the 495 piece Form C case from M6 to M24, with the 240 piece repair washer box covering M5 to M10 in zinc plate, and the specialist forms serve their trades directly beside them, the 250 piece diesel injector copper washer assortment sealing the hot joints that must crush once to seal, and the captive acme screw washers in their packs of fifty.
The combined kits are the shelf's most practical answer: setscrew, nut and washer assortments boxed together by thread, M5 through M6 and M8 to M10 in high tensile metric and the 710 piece stainless hex socket case beside them, so the whole joint arrives graded together in one single box rather than across three separate orders.
Straight sizes back the boxes for the washers used by the hundred, the M10 Form C in packs of 100 among them, and size with form typed into search finds the washer at once. An odd washer measured across, through the bore and for thickness over WhatsApp on 07754288583 comes back named, its form identified from the proportions in the photo.
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