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Twelve black rubber M4 flat washers 9mm OD 1.2mm thick

M4 Rubber Flat Washer 12 Pack 9mm 1.2mm Thick Sealing

SKU CH-HVBB-G3MWS

A 12-pack of M4 rubber flat washers with 4 mm inner diameter, 9 mm outer diameter and 1.2 mm thickness for sealing water, oil or air connections

  • Key featuresFlat, Rubber, Black
  • Overall height1.2 mm
  • Overall width1 L x 5.1 W x 11.5 H centimeters
  • Overall length1 L x 5.1 W x 11.5 H centimeters
  • M4 rubber washers seal water, oil and air connections
  • 12-piece pack covers multiple household and automotive repairs
  • Flexible rubber resists heat, wear and corrosion for lasting performance
  • 4 mm inner and 9 mm outer diameter fits standard M4 fasteners
  • 2 mm thickness cushions bolts and spreads load evenly

M4 Rubber Flat Washer 12 Pack

This pack supplies twelve M4 rubber flat washers for sealing and spacing tasks. Each washer has a 4 mm inner diameter, a 9 mm outer diameter and a 1.2 mm thickness. The flexible rubber material resists wear, corrosion and high temperatures while providing effective sealing on irregular surfaces. They suit home installations, household appliances and bolted connections where a reliable gasket is required.

Sealing limits of rubber washers

Rubber washers seal water, oil and air in low-pressure static joints. They are not designed for high-pressure hydraulic systems or dynamic sealing where movement occurs. The 1.2 mm thickness limits the compression range, so they cannot compensate for large gaps or severely damaged flanges. Over-tightening can extrude the rubber and reduce sealing performance.

Checks before ordering

Verify that the fastener is an M4 bolt or screw so the 4 mm inner diameter fits correctly. Confirm the 9 mm outer diameter clears the surrounding hardware and fits the seating surface. Ensure the joint materials are compatible with rubber and that a nylon spacer is used when mating with nylon or glass to prevent surface damage. Choose the correct diameter to maintain sealing effectiveness.

How it compares

Measured against everything we stock in Parts Washers & Ultrasonic Cleaners, at today’s prices. Recalculated every night.

Price $8.99
Cheaper than about 95% of the 25 comparable items (median $15.99).

Specifications

Product
Brand namePATIKIL
Size & build
Overall height1.2 mm
Overall width1 L x 5.1 W x 11.5 H centimeters
Overall length1 L x 5.1 W x 11.5 H centimeters

Questions about this item

Should I pick the 12 pack or one of the larger quantities for my M4 bolts?

The 12 pack supplies exactly twelve M4 rubber washers sized 4 mm inner diameter by 9 mm outer diameter and 1.2 mm thick, matching the stated dimensions for this listing.

What does the 1.2 mm thickness do once the washer is seated under a bolt?

At 1.2 mm thick the rubber compresses to seal water, oil or air paths while cushioning the joint, spreading clamp load and protecting the mating surface from damage.

Will these rubber washers handle the temperature and pressure in a household water line?

The flexible rubber material is rated for high temperature, wear and corrosion resistance, making it suitable for sealing faucet pipes, hose nuts and garden watering accessories.

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