CR 064018-009

Frequently Asked Questions

Q: What is the CR 064018-009 quad ring seal and what does it do?
A: The CR 064018-009 is a Crown OEM quad ring seal (also called quad ring or X-ring) designed for dynamic hydraulic sealing applications in Crown electric lift trucks. Quad rings provide superior sealing compared to O-rings because the four-lobe design creates multiple sealing surfaces.

Q: What are the material and dimensional specifications?
A: The CR 064018-009 is manufactured from NBR 70A (nitrile butadiene rubber) elastomer. It is sized to AS-568 Size 010 specification with an inner diameter of 0.239 inches and a cross-section of 0.070 inches. These dimensions are standard for applications requiring precision sealing in tight spaces.

Q: What is the advantage of the four-lobe quad ring design?
A: The four-lobe quad ring eliminates spiral twist that can occur with traditional O-rings during rod or piston movement. This design optimizes durability, improves extrusion resistance under high pressure, and maintains consistent sealing performance throughout the seal life.

Q: Why is NBR 70A elastomer used for this seal?
A: NBR 70A provides excellent resistance to hydraulic mineral oils, water absorption resistance, and durability in dynamic applications. The 70A durometer rating offers the right balance between hardness and flexibility for maintaining consistent contact pressure against moving rods and cylinder walls.

Q: What is the difference between quad ring and O-ring seals?
A: Quad rings have four lobes instead of one round cross-section, creating multiple sealing surfaces and better surface contact. This reduces friction, improves pressure retention, resists spiral twisting, and extends seal life compared to standard O-rings in dynamic hydraulic applications.