A t-slot machined washer (often called a Williams washer in machining/fixturing contexts) is a thick, precision‑machined washer designed to sit in the T‑slots of machine tables, fixtures, or aluminum extrusion framing. It provides a large, flat bearing surface so that clamping bolts can transfer high clamping forces without damaging the slot, and its shape keeps the bolt load centered and secure during machining or assembly operations.

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Diameters

are available on the FCH Network with Imperial/US diameters that range from #1 to 6

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US/Imperial diameters
Metric diameters
Materials

are available on the FCH Network in materials that range from Steel to Steel

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Finishes

are available on the FCH Network in finishes or coatings that range from Plain to Black Oxide

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