Be ready for leaks, rebuilds, and routine maintenance with the Stone River Products Metric O-Ring Kit.
This assortment includes 350 Buna-N metric O-rings in a convenient organizer case, covering 18 commonly used sizes from 3mm to 20mm inside diameter, all in a 2mm cross section.

These are standard-grade Buna-N Nitrile (NBR) 70 Shore A seals—one of the most widely used elastomers in industrial and automotive sealing.
NBR is valued for its reliability and cost-effective performance, especially in oil and fluid environments.

Material Performance

Buna-N (NBR) Seals are typically resistant to:
Mineral oil-based lubricants & greases
Many grades of hydraulic fluids
Aliphatic hydrocarbons
Silicone oils & greases
Water (to about 80°C)

That makes this kit a smart choice for service benches, toolboxes, field kits, and anyone working with metric equipment.

Kit Contents (2mm CS – 18 Sizes / 350 Total)

3mm ID – 25 pcs
4mm ID – 25 pcs
5mm ID – 25 pcs
6mm ID – 25 pcs
7mm ID – 25 pcs
8mm ID – 20 pcs
9mm ID – 20 pcs
10mm ID – 20 pcs
11mm ID – 20 pcs
12mm ID – 20 pcs
13mm ID – 20 pcs
14mm ID – 15 pcs
15mm ID – 15 pcs
16mm ID – 15 pcs
17mm ID – 15 pcs
18mm ID – 15 pcs
19mm ID – 15 pcs
20mm ID – 15 pcs

Whether you're servicing hydraulic tools, pneumatic systems, automotive components, or general industrial equipment, this kit keeps the right size close at hand.