351-Piece Silicone O-Ring Assortment Kit – 10 Standard Sizes

Stop leaks before they start! This comprehensive 351-piece silicone O-ring kit gives you 10 different standard sizes in one convenient set — perfect for automotive repairs, plumbing, industrial pipelines, household appliances, and hydraulic systems. Whether you're a DIY mechanic or a professional tradesperson, this kit keeps you prepared for virtually any sealing job.

Made in Mainland China.

Why Choose This O-Ring Kit?

10 Standard Sizes in One Set: 351 individual O-rings covering a wide range of sealing applications — no more hunting for the right size mid-job.
Premium Silicone Material: High-grade silicone rubber delivers exceptional oil resistance, heat resistance, and flexibility — ideal for car engines, hydraulic systems, and high-temperature pipelines.
Tight, Reliable Seal: The highly elastic design conforms precisely to mating surfaces, effectively preventing liquid and gas leaks for long-term pipeline and component safety.
Corrosion & Aging Resistant: Built to last, these O-rings resist chemical corrosion and material aging, reducing the need for frequent replacements and saving you money over time.
Widely Applicable: Great for automotive repair, plumbing, HVAC, industrial machinery, household appliances, and general-purpose sealing tasks.

Product Specifications

Material: Silicone Rubber
Color: Red
Sizes Included: 10 different standard sizes
Quantity: 351 pieces total

What's in the Box?

351 × Silicone O-Rings (assorted across 10 standard sizes)

Related Products You May Need

10,000 PSI Grease Gun Coupler NPT 1/8 Quick Release Nozzle — keep your fittings sealed and lubricated.
0-60MPa Pressure Gauge for S60H Diesel Injector Nozzle Tester — test and verify your hydraulic seals with confidence.

For more information on sealing materials and standards, visit the National Institute of Standards and Technology (NIST), which provides guidelines on material performance and industrial standards.

Frequently Asked Questions

Q: What sizes are included in the 351-piece silicone O-ring kit?

A: The kit includes O-rings in 10 different standard sizes, providing excellent coverage for a wide range of automotive, plumbing, and industrial sealing applications. The varied size assortment means you'll have the right fit on hand for most common jobs.

Q: Are these silicone O-rings safe to use in automotive engines and hydraulic systems?

A: Yes. These O-rings are made from high-quality silicone rubber, which offers excellent resistance to oil, heat, and chemicals — making them well-suited for use in car engines, hydraulic lines, and high-temperature pipeline systems.

Q: How do silicone O-rings compare to standard rubber O-rings?

A: Silicone O-rings generally outperform standard rubber O-rings in terms of temperature range, UV resistance, and aging resistance. They remain flexible and effective across a broader range of operating conditions, making them a more durable and long-lasting sealing solution for demanding environments.

Made with care

Great value

Elegant design

Quality materials

This product is crafted with quality materials to ensure durability and performance. Designed with your convenience in mind, it seamlessly fits into your everyday life.

We strive to process and ship all orders in a timely manner, working diligently to ensure that your items are on their way to you as soon as possible.

We are committed to ensuring a positive shopping experience for all our customers. If for any reason you wish to return an item, we invite you to reach out to our team for assistance, and we will evaluate every return request with care and consideration.