When you need replacement seals, the choice often comes down to a broad assortment versus a single-size refill. Both of these new O-ring options serve different repair scenarios, so let's compare a metric kit and an AS568-235 set.
Quick Verdict
If you want one box to cover many metric sealing jobs, the metric nitrile assortment at USD 12.74 is the practical choice. If your work involves hydraulic, pneumatic, or automotive systems that use AS568-235, the Buna set at USD 20.00 provides a dedicated supply of that exact size. The right pick depends on whether you need broad coverage or a known standard.
Comparison Table
| Product | Listed Price | Price Bar | What's Included |
|---|---|---|---|
| O-Ring Assortment Kit 400Pc Nitrile Rubber Metric Sizes Industrial Seals | USD 12.74 | 400 metric O-rings, 4mm-30mm OD, five thickness options | |
| AS568-235 Buna 70 Duro O-Ring Set Qty 25 Hydraulic Industrial Seals NOS | USD 20.00 | 25 AS568-235 Buna-N O-rings, 70 durometer |
Where Each Product Wins
- The metric assortment wins when you need a range of metric sizes and thicknesses for plumbing, automotive, and general repair tasks. Its size variety and listed price make it a good first box for a tool drawer.
- The AS568-235 set wins when you need a specific standard size for hydraulic, pneumatic, industrial, fuel, or oil sealing. You get a dedicated quantity of one known dimension rather than a scattering of sizes.
Product Notes
O-Ring Assortment Kit 400Pc Nitrile Rubber Metric Sizes Industrial Seals
This assortment is built for convenience. It contains 400 metric O-rings with outside diameters from 4mm to 30mm, across five thickness options: 1mm, 1.5mm, 1.9mm, 2.4mm, and 3.1mm. The nitrile rubber construction offers oil resistance, UV resistance, heat resistance, and wear resistance, making it a practical all-around choice. The rings are soft and flexible, and they are designed to snap on without special tools. Each ring is stored in a labeled, resealable container, which helps you find the right size quickly. The limitation is that you get a spread of sizes rather than a deep supply of any single dimension, so a repeated repair in the same size might exhaust that particular slot. Also, this kit is metric, so it may not match AS568 inch-based standards.
AS568-235 Buna 70 Duro O-Ring Set Qty 25 Hydraulic Industrial Seals NOS
This 25-pack is all about specificity. Each O-ring matches the AS568-235 standard and is made of Buna-N (nitrile) with a 70 durometer hardness. That combination is commonly used in hydraulic, pneumatic, automotive, fuel, and oil sealing applications, so it covers a lot of industrial ground even though it is just one size. The set is described as new old stock, meaning the rings are unused. The trade-off is the narrow scope: a 25-piece quantity of one size, which won't help if you need a different O-ring for another job. If your system needs AS568-235, this pack gives you a correct replacement without carrying a full assortment of extras.
Final Choice by Use Case
For everyday repairs where you might need rings in several different metric sizes, the metric nitrile assortment is the better fit. For a known AS568-235 size in hydraulic or pneumatic systems, the Buna set is the one to buy.
