• AS568-004 O-Ring – 0.070 in ID × 0.070 in CS – dimensional diagram showing ID, OD and cross-section
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Royal Way

AS568-004 O-Ring – 0.070 in ID × 0.070 in CS | NBR, HNBR & FKM

AS568-004 O-Ring – 0.070 in ID × 0.070 in CS | NBR, HNBR & FKM
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Read the AS568 O-Ring Size & Gland Selection Guide

AS568-004 O-Ring – 0.070 in ID × 0.070 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: AS568-004
  • Inside diameter (ID): 0.070 in / 1.78 mm
  • Cross section (CS): 0.070 in / 1.78 mm
  • Outside diameter (OD): 0.210 in / 5.34 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 AS568-004. Depending on the equipment design, this series is commonly encountered in small valves, instrumentation, pneumatic controls, sensor housings and compact service-tool glands.

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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