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Copper sealing washers M13 13mm ID 18mm OD 1.5mm thick pack of 50

Zoro Select

Zoro Select M50301.130.0018 Sealing Washer M13 Copper Pack of 50

SKU CH-WYMC-MRFS9

Copper sealing washers for M13 bolts, 13 mm inner and 18 mm outer diameter, 1.5 mm thick, pack of 50

  • Product typeWashers
  • Copper construction resists corrosion for durable seals
  • Annealed heat treatment ensures consistent 1.5 mm thickness
  • 13 mm inside diameter fits M13 bolts precisely
  • 18 mm outside diameter distributes load evenly
  • Pack of 50 washers covers multiple assemblies

Copper Sealing Washers M13 Pack of 50

These copper sealing washers fit M13 bolts and come in a pack of fifty. They suit maintenance tasks on fluid systems where a soft metal seal is required. The annealed copper compresses evenly to help prevent leaks. Mechanics and DIYers can keep a supply on hand for repeated jobs.

Thermals Noise and Power Draw

As passive copper components these washers generate no heat, no noise and draw no power. They simply deform under torque to create a seal between mating surfaces. Normal use involves tightening to the specified thickness and leaving them in place. No ongoing energy or acoustic considerations apply.

Build Quality and Connectors

Each washer has an inside diameter of 13 mm, an outside diameter of 18 mm and a thickness of 1.5 mm with a tolerance of +/- 0.2 mm. The plain finish and annealed heat treatment keep the copper soft for reliable sealing. The metric dimensions match M13 fasteners directly. The pack of fifty provides enough pieces for multiple assemblies or spares.

How it compares

Measured against everything we stock in General Hardware & Accessories, at today’s prices. Recalculated every night.

Price $10.99
Cheaper than about 70% of the 2,607 comparable items (median $18.99).

Specifications

Product
Brand nameZORO SELECT
Product typeWashers

Questions about this item

How do I install the M13 copper sealing washer and which orientation mistake should I avoid?

Place the 13 mm inner diameter over the M13 bolt so the 18 mm outer face seats flat against the joint; the common error is flipping it so the chamfered edge faces the flange, which reduces the copper seal contact.

What maintenance or replacement will the copper sealing washers need over time?

Copper work-hardens after repeated tightening cycles; inspect for cracking or permanent set at the 1.5 mm thickness and replace any washer that no longer springs back when the joint is broken.

What is the first limit reached when the M13 copper washers are under sustained clamping load?

The 1.5 mm thickness with ±0.2 mm tolerance yields first; once the copper yields beyond that range the seal gap opens and leak path appears.

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