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Thirty small red silicone O-rings in a pile

Unique-Bargains

Unique-Bargains Silicone O-Ring 4mm OD 1mm ID 1.5mm Width Red Pack of 30

SKU CH-MMQE-ST3GE

Pack of 30 red silicone O-rings with 4mm outer diameter, 1mm inner diameter and 1.5mm cross-section for high-temperature sealing

  • Wide temperature range from -22 °F to 392 °F
  • 50 durometer hardness resists penetration under pressure
  • 30 red silicone O-rings per pack for multiple repairs
  • 4 mm outer diameter fits standard small fittings
  • VMQ silicone withstands oils, fuels and hydraulic fluids

Silicone O-Rings 4 mm OD Pack of 30

These red silicone O-rings measure 4 mm outside diameter, 1 mm inside diameter and 1.5 mm cross-section. They suit hobbyists and technicians who need small sealing rings for coffee makers, travel mugs, brewing fittings or general hydraulic and pneumatic repairs. The pack supplies thirty pieces for multiple jobs or spares.

Sustained Load Behaviour

Rated at 50 Shore A durometer, the rings resist permanent deformation under continuous compression. The VMQ silicone operates from -30 °C to 200 °C, maintaining elasticity during long exposure to hot water, steam, oil or hydraulic fluid without hardening or cracking.

Replaces Worn Seals in Small Ports

The 4 mm OD size fits narrow grooves in espresso machines, weldless brewing fittings and miniature valve bodies where larger standard rings cannot seat. Buyers needing imperial dimensions, higher durometer, chemical resistance beyond oil and hydraulic fluid, or diameters above 4 mm will not find a match here.

How it compares

Measured against everything we stock in Caulking & Sealing Supplies, at today’s prices. Recalculated every night.

Price $3.99
Cheaper than about 95% of the 631 comparable items (median $16.99).

Specifications

Product
Brand nameUnique Bargains

Questions about this item

Does the 50-durometer silicone stay soft enough to seal a hot espresso machine without hardening over time?

The VMQ material is rated from -22 to 392 degrees, so it remains flexible and maintains its seal through daily heat cycles in coffee makers and boilers.

Will the 4 mm outer diameter and 1 mm inner diameter fit the groove on my existing travel-mug lid?

Measure the groove on your lid; these rings need a 4 mm outside diameter, 1 mm inside diameter and 1.5 mm cross-section to sit correctly.

Can I mix these red 1.5 mm cross-section rings with the black 2 mm rings already in my hydraulic kit?

Different cross-sections create uneven compression, so keep the 1.5 mm rings together and do not combine them with thicker or thinner seals in the same groove.

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