• AS568-254 O-Ring – 5.484 in ID × 0.139 in CS – dimensional diagram showing ID, OD and cross-section
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Royal Way

AS568-254 O-Ring – 5.484 in ID × 0.139 in CS | NBR, HNBR & FKM

AS568-254 O-Ring – 5.484 in ID × 0.139 in CS | NBR, HNBR & FKM
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Read the AS568 O-Ring Size & Gland Selection Guide

AS568-254 O-Ring – 5.484 in ID × 0.139 in CS | NBR, HNBR & FKM

Royal Way supplies this standard AS568 size in NBR (Buna-N), HNBR (HSN) and FKM (Viton-type), with 70 and 90 Shore A options for maintenance, repair and production requirements.

Size Specifications

  • AS568 size: AS568-254
  • Inside diameter (ID): 5.484 in / 139.29 mm
  • Cross section (CS): 0.139 in / 3.53 mm
  • Outside diameter (OD): 5.762 in / 146.35 mm

Material and Hardness Options

  • NBR / Buna-N: commonly selected for petroleum oils and compatible hydraulic fluids
  • HNBR / HSN: improved heat, ozone, aging and mechanical resistance compared with standard NBR
  • FKM / Viton-type: selected for higher-temperature service and broader fluid compatibility
  • 70 Shore A: general sealing flexibility and conformity
  • 90 Shore A: greater extrusion resistance for suitable higher-pressure clearances

Typical Use

Designed for equipment whose gland or groove is specified for AS568-254. Depending on the equipment design, this series is commonly encountered in compatible valves, pumps, hydraulic cylinders, pressure-control equipment and downhole service tools.

Ordering and Fit Verification

An AS568 dash number defines size, not universal equipment compatibility. Confirm groove dimensions, squeeze, stretch, clearance, pressure, temperature, fluid compatibility and backup-ring requirements before ordering or installation.

Material Options

Available materials include Buna-N / NBR, HSN / HNBR, and FKM / Viton®-type compounds.

Buna-N / NBR is the most common material for general oilfield O-rings and sealing rings. It is suitable for oil, water, drilling fluid, and standard industrial sealing applications.

HSN / HNBR is used when improved heat, abrasion, aging and mechanical resistance are required. Sour gas / H2S and rapid-gas-decompression service require compound-specific qualification for the actual gas composition, pressure, temperature and decompression rate.

FKM / Viton®-type provides better high-temperature and chemical resistance for selected oils, fuels, and chemical media.

Standard hardness is usually 90 Shore A unless otherwise specified. Please confirm size, hardness, material, groove dimensions, and service conditions before ordering.

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