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API Standard 682 seal

Mechanical seals for pumps
Metal bellows seals
  • Compact design
  • Bellows design allows use of balanced seal with plain sleeve
  • Absence of dynamic O-Ring eleminates/reduces seal face hang-up
  • Bellows design minimizes variation in face load due to shaft expansion or face wear
  • Resistant to abrasive particles in the medium, no shaft or sleeve fretting
  • Low heat generation and power consumption due to narrow seal face width
  • Longer seal life


  • API 682 Category 2 and 3, Type B, Arrangement 1 seal
  • Single Seal
  • Balanced
  • Cartridge unit
  • Rotating metal bellows
  • Shrink fitted seal ring and solid mating ring

Product specification example

Standards and approvals

API 682 / ISO 21049


Seal ring: Blister resistant carbon

Mating ring: Silicon carbide SSiC (Q1), RBSiC (Q2)

Bellows: Hastelloy® C-276 (M5)、option: Inconel® 718 (M6)

Secondary seals: FKM (V), FFKM (K), EPDM (E), NBR (P)

Metal parts: CrNiMo steel 316 (G)

Operating range

Pressure: p = vacuum … 20 bar (290 PSI)

Temperature: t = -40 °C … +200 °C (-40 °F … +392 °F)

Sliding velocity: vg … 23 m/s (75 ft/s)

Viscosity: … 1,000 mPas

Solids content: … 0.5 wt.%

Recommended applications

Refining technology

Oil and gas industry

Petrochemical industry

Chemical industry

Power plant technology

LPG plants

API 610 / ISO 13709 pumps

Process pumps

Recommended piping plans

Process side: 01, 02, 11, 12, 13, 14, 21, 22, 23, 31, 32, 41

Atmospheric side: 51, 61, 62, 65A, 65B, 66A, 66B

Applicable ranges shown in the product introduction are limit values for each standard material.
Applicable ranges, performance data and figures can serve only as a guide for selection and therefore in actual use there will be some cases where general specifications cannot be applied due to unknown factors or constraints.
Please check the applicability before use.
The contents are subject to change without notice for improvement.


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