Type 21 Mechanical Seal in Inches | Sealing Tech-G

The Sealing Tech-G Type 21 Mechanical Seal in Inches 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 1/2" to 2 1/2", with multiple combinations of face materials (Carbon/Silicon, Carbon/Ceramic, Silicon/Silicon) and elastomers (EPDM, NBR), allowing it to be adapted to a wide variety of fluids, temperatures, and operating conditions. Its proven and widely standardized design facilitates field replacement and maintenance.

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 elastomer selected
• Food and beverage industry: water, juices, and clean fluids with C/SiC or SiC/SiC faces
• General industrial maintenance: replacement of seals in standard centrifugal pumps

Technical Specifications

• Type: Single mechanical seal Type 21 (industrial standard)
• Measurement system: Imperial (inches)
• Available shaft diameters: 1/2" / 5/8" / 3/4" / 1" / 1 1/8" / 1 1/4" / 1 1/2" / 1 5/8" / 1 3/4" / 2" / 2 1/4" / 2 1/2"
• Sliding face material: Carbon / Silicon (C/SiC) | Carbon / Ceramic (C/Al₂O₃) | Silicon / Silicon (SiC/SiC)
• Elastomer material: EPDM | NBR
• Configuration: Single seal
• Unit of sale: Unit
• Country of origin: Spain / Taiwan
• Brand: Sealing Tech-G

Equivalent to

• John Crane Type 21 (the original — this seal is named after it)
• EagleBurgmann MG1 / B21 Series
• Flowserve SLC-21 Series
• AESSEAL B21 Series
• Vulcan Seals Series 21
• Roten Type 21
• AES (Chesterton) Series 442 / Type 21

Compatible with

• Grundfos NK, NB, CM, CR (imperial shaft versions)
• Goulds Series 3196, 3656, 3316
• Flowserve Mark 3, ANSI Series
• Ebara 3LS/3LM, ASH Series
• Pedrollo F, NGA, HF Series
• Lowara SH, CO Series
• KSB Etanorm, Megachem Series
• Aurora 341/411 Series
• Durco Mark 3 ANSI Series
• Berkeley B series
• Peerless TU/HH Series
• ITT Goulds ANSI Series

Other Common Names

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