249 O-Ring, Buna-N, 90A, ID 4-7/8", OD 5-1/8", 1/8" width, black (pack of 50)
Buna-N o-rings with 90A hardness for seals between cylindrical surfaces across -40 to 212 F. Durable and versatile for petroleum to aliphatic fluids. Customers note heavy-duty performance and good value, though size accuracy opinions vary
Highlights
- 90A hardness for durable seal
- widest temperature range
- pack of 50 for bulk use
Pros
- Buna-N material for fluid versatility
- 90A hardness provides durable seals
- Wide temperature range
- Round cross-section for reliable sealing
- Pack of 50
Cons
- Mixed opinions on size accuracy
- Some perceive stiffness
Best For
Features
- Buna-N / Buna-nitrile material suitable for a range of fluids including petroleum and aliphatic hydrocarbons
- Durometer hardness rated at 90A for consistent sealing performance
- Round cross-section creates a seal between cylindrical overlapping surfaces
- Operating temperature range from -40°F (-40°C) to 212°F (100°C)
- Conforms to Aerospace Standard AS568A
