Type 21 Mechanical Seal in Millimeters | Sealing Tech-G

The Sealing Tech-G Type 21 Mechanical Seal in Millimeters is a simple, versatile, and widely used industrial mechanical seal designed to seal clean and abrasive fluids in centrifugal pumps. Available in a wide range of shaft diameters from 20 mm to 50 mm, with multiple material combinations for the faces (Carbon/Silicon, Carbon/Ceramic, Silicon/Silicon) and elastomers (EPDM, NBR), allowing it to adapt to a great variety of fluids, temperatures, and operating conditions. Its proven and widely standardized design facilitates replacement and field maintenance. It complements the Type 21 Inch Seal to cover the full spectrum of pumps with metric system shafts.

Applications

• Clean water systems: supply pumps, agricultural irrigation, and municipal distribution
• Boilers and steam systems: boiler feed pumps with treated water
• Mining and abrasive processes: fluids with suspended solids (with appropriate face selection)
• Chemical and process industry: fluids compatible with EPDM or NBR depending on the selected elastomer
• Food and beverage industry: water, juices, and clean fluids with C/SiC or SiC/SiC faces
• General industrial maintenance: replacement of seals in centrifugal pumps with metric shafts

Technical Specifications

• Type: Single mechanical seal Type 21 (industrial standard)
• Measurement system: Metric (millimeters)
• Available shaft diameters: 20 mm / 22 mm / 24 mm / 25 mm / 28 mm / 30 mm / 32 mm / 38 mm / 40 mm / 45 mm / 50 mm
• Sliding face material: Carbon / Silicon (C/SiC) | Carbon / Ceramic (C/Al₂O₃) | Silicon / Silicon (SiC/SiC)
• Elastomer material: EPDM | NBR
• Configuration: Single seal
• Sales unit: Unit
• Country of origin: Spain / Taiwan
• Brand: Sealing Tech-G

Equivalent to

• John Crane Type 21 metric
• EagleBurgmann MG1 Series / B21 metric
• Flowserve SLC-21 Series metric
• AESSEAL B21 Series metric
• Vulcan Seals 21 Series metric
• Roten Type 21 metric
• AES (Chesterton) 442 Series / Type 21 metric

Compatible with

• Grundfos NK, NB, CM, CR (metric shaft versions)
• KSB Etanorm, Megachem, Etabloc
• Ebara 3LS/3LM Series, CD/CDX
• Pedrollo F, NGA, HF, PKm Series
• Lowara SH, CO, FC Series
• Sulzer APP, CPT Series
• Wilo MVI, BL, IL Series
• DAB K, KVC, BPH Series
• Caprari MEC, HMU Series
• Bombas Ideal BC, BCS Series

Other Common Names

This component is also known as: sello mecánico tipo 21 métrico, mechanical seal type 21 metric, sello simple bomba centrífuga milímetros, Type 21 pump seal metric, cierre mecánico estándar métrico, sello mecánico agua limpia mm, sello bomba caldera métrico, sello mecánico riego agrícola mm.