Zoro Select M50302.380.0044 Sealing Washer M38 Copper 10 Pack

Copper sealing washers for M38 bolts

These copper sealing washers suit M38 fasteners in hydraulic, fuel or high-pressure plumbing systems. The annealed copper conforms under torque to create a reliable metal-to-metal seal. Each washer measures 38 mm inside diameter by 44 mm outside diameter with a uniform 2 mm thickness. The pack contains ten pieces for multiple joint assemblies.

Fits M38 threads and 44 mm counterbores

The washers slide over M38 bolts or studs and seat against a 44 mm landing surface. Their plain finish and consistent 2 mm profile leave no raised features to interfere with adjacent components. The +/- 0.2 mm thickness tolerance keeps stack-up predictable in precision manifolds or pump housings. Copper construction resists galling during repeated disassembly.

Ten washers cover several connection points

A single pack services up to ten sealing faces on an M38 circuit. The annealed temper ensures each washer yields evenly at standard torque values without work-hardening. Copper’s thermal stability maintains seal integrity across wide temperature swings. Builders needing larger diameters, different materials or bulk quantities will need additional sources.