ISO 9001 · IATF 16949 Black X-ring quad ring

X-ring quad ring detail, four-lobe cross-section

MOLDED SEALS

X-Rings & Quad Rings

The four-lobed upgrade to the O-ring. X-rings resist spiral failure in reciprocating motion, hold lubricant between the lobes, and seal with lower friction — a drop-in upgrade that fits standard AS568 O-ring grooves with no redesign of your hardware. The mold parting flash sits in the lip groove — never on the sealing face, so it can't cause leaks.

✓Four-lobe profile prevents twisting and spiral failure in dynamic service
✓Double sealing line with pressure self-compensation — seals reliably even at low pressure
✓Fits standard AS568 / metric O-ring grooves — no groove redesign needed
✓NBR, FKM, EPDM and VMQ silicone compounds
✓Every batch dimensionally checked; test reports on request

STANDARDS

AS568 · ISO 3601 · Metric

HARDNESS

70–90 Shore A

GROOVE

Same as O-ring

TESTING

ASTM D2000

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TECHNICAL DATA

Compounds & Temperature Range

Pick the elastomer that fits your media and working temperature — or send your requirements and our engineers will recommend one.

Material	Properties	Temp. Range
NBR (Buna-N)	Cost-effective all-rounder for hydraulic oil and compressed air.	-30°C to +100°C
FKM (Viton®)	Oil, high-temperature and chemical resistance.	-20°C to +200°C
EPDM	Hot water, steam and antifreeze service.	-50°C to +150°C
VMQ Silicone	Clean, oil-free sealing for high and low temperatures.	-60°C to +230°C

APPLICATIONS

Where It's Used

Wherever motion makes O-rings twist and fail.

HYDR

Hydraulics & Pneumatics

Construction machinery, machine tools, hydraulic valves and pneumatic actuators.

AUTO

Automotive

Braking, steering and shock-absorber cylinders.

INST

Instruments & Dispensing

Dispensing valves, pump bodies and instruments with frequent start-stop.

FOOD

Food & Pharma

Silicone grades for clean equipment and sanitary lines.

IND

Industrial Machinery

Automation and machine tools where dynamic sealing life matters.

PUMP

Pumps & Valves

Longer service life in rotary and reciprocating pump seals.

COMMON QUESTIONS

X-Ring FAQ

What's the difference between an X-ring and an O-ring?

The four-lobed cross-section resists twisting, holds lubricant between the lobes and seals with lower friction — better for dynamic service. O-rings remain the economical choice for static sealing.

Are X-rings suitable for high pressure?

They resist extrusion better than O-rings at the same squeeze. For very high-pressure service we recommend them with back-up rings — ask our engineers.

What are the limits of X-rings?

Keep rotary service at or below about 2 m/s — X-rings are not for high-speed rotation. High-pressure service needs back-up rings against extrusion, and they cost more than standard O-rings. Our rule of thumb: static sealing → O-ring; reciprocating or frequent start-stop → X-ring.

KEEP EXPLORING

Related Products

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Standard & custom sizes, 8 compounds

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Hydraulic & Rotary Seals

High-pressure piston & rod seals

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Encapsulated O-Rings

FEP/PFA jacketed for harsh media

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Gaskets & Spacers

Die-cut & molded sealing gaskets