HRU12-0.37-12 - AS568-204 Replacement 70 Duro Nitrile U-Cup Seal

3/8" ID X 5/8" OD X 1/8" HT – AS568-204 Replacement

HRU12-0.37-12 Homogeneous U-Cup Seal – Product Description:

Engineered for performance and priced for value, the HRU Homogeneous U-Cup Seal is the go-to replacement for AS568 O-Rings and in demanding pneumatic and hydraulic applications. Whether you're maintaining industrial cylinders, upgrading automation systems, or seeking a more reliable alternative to standard O-Rings, this U-Cup delivers a perfect balance of sealing integrity, durability, and cost-efficiency. The 70 durometer Nitrile material provides long-lasting resistance to oils and hydraulic fluids, making it a smart choice for OEMs, MRO professionals, and field technicians alike. With immediate availability and expert support, The O-Ring Store LLC ensures you get the right seal the first time—every time.

• Direct AS568-204 replacement – Part # HRU12-0.37-12, 666-204
• Dimensions: 3/8" Inside Diameter x 5/8" Outside Diameter x 1/8" Height
• Homogeneous U-Cup Seal – also known as block vee seal or Pruva™ U-Cup / Huva Cup
• Single-material design ensures predictable and uniform sealing in dynamic applications
• Engineered for low-pressure hydraulic and pneumatic systems
• Performs reliably as a rod or piston seal in linear motion equipment
• Maintains sealing integrity in pressures up to 500 PSI
• Manufactured from 70 durometer Nitrile (Buna-N) – excellent resistance to oils, fuels, and many hydraulic fluids
• Operating temperature range for Nitrile: -40°F to +212°F (-40°C to +100°C)
• Alternative compounds available upon request: FKM (Viton®), EPDM, Neoprene, and more

Ideal For Use In:

• Pneumatic and hydraulic cylinders
• Industrial automation and linear actuators
• General sealing maintenance and O-Ring retrofits
• Applications with space constraints requiring low-friction sealing

Why Buy from The O-Ring Store LLC?

• ISO 9001:2015 Certified – quality you can rely on
• Over 50 million O-Rings and seals in stock and ready for immediate shipment
• Free Material Data Sheets and batch traceability upon request
• In-house custom kitting, labeling, and packaging services
• Friendly expert support from the industry’s most trusted seal specialists