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John Crane 21 Single Spring Mechanical Seal 0.5Inch Elastomer Bellows Mechanical Seal

Minimum Order Quantity : 100PC Price : Negotiated
Packaging Details : box as requirement Delivery Time : 10DAYS
Payment Terms : T/T, Western Union, L/C Supply Ability : 10000000PC/Month
Place of Origin: MADE IN CHINA Brand Name: JR
Certification: iso9001 Model Number: 21 21T

Detail Information

Material: SIC SIC FKM Cer Car Nbr Function: For Oil Pump, Water Pump
Transport Package: Box HS Code: 848420090
Specification: 21 21T Mechanical Seal Certificate: ISO9001
Type: John Crane 21 Seal Standard Or Nonstand: Standard
Style: John Crane 21 Seal Aesseal P04/P04T Seal Flowserve 110 Seal Size: 0.5INCH-3INCH
High Light:

John Crane 21 Single Spring Mechanical Seal


0.5Inch Single Spring Mechanical Seal


0.5Inch Elastomer Bellows Mechanical Seal

Product Description

Mechanical Shaft Seal John Crane Type 21 Seal Elastomer Bellows Mechanical Seal Flowserve 110 Seal For Water Pump​ Sic Sic FKM
Operations Conditions:

  1. Structure: Single End
    Pressure: Medium Pressure Mechanical Seals
    Speed: General Speed Mechanical Seal
    Temperature: General Temperature Mechanical Seal
    Performance: Wear
    Standard: DIN24960, ISO3069, GB6556
    Model NO.: BIA, Type 21, and Type 43
    Balance: Unbalanced
    Specification: Inner Diameter: 12 mm to 100 mm
  2. John Crane 21 seal
  3. Aesseal P04/P04T seal
  4. Flowserve 110 seal
  5. Temperature:-20ºC to +150ºC
  6. Pressure:≤1.5bar
  7. Speed:≤18m/s


  • 1. Sealing face: Graphite, Silicon carbide, Tungsten carbide, Aluminum oxide
  • 2. Secondary sealing: Acrylonitrile rubber, Fluorine rubber, Ethylene propylene rubber
  • 3. Metal component: Stainless steel

Performance Capabilities:

-20℃ to150℃, dependent on the elastomer
Up to 1.5 MPA
Up to 18 m/s
End play/axial float allowance
Carbon, SiC, TC
Ceramic, SiC, TC
SS304, SS316
Metal parts
SS304, SS316
Packing Individual packing ,1 pc in 1 small box is available as well


  • 1. it is equivalent to
  • Roten 21Aseal
  • Sealol 43 CU Short seal
  • Sterling212Aseal
  • US Seal C seal
  • BIA (also known as Type 21 or Type 43) Mechanical Seal for Clean Water Pumps, Piping Pumps and Vacuum Pumps

    Structural Features: single end, unbalanced, independent direction of rotation, rubber bellow, bellow transmission. This component has a compact structure with good compatibility, stablity and easy installation.

    Industrial Standards: DIN24960, ISO3069, GB6556

    Scopes of Application: widely used in oil and water circulation pumps, piping pumps, and vacuum pumps for industries such as sewage treatment and paper-making. This product can be an alternative to similar products from EG&G SEAL OL.


John Crane 21 Single Spring Mechanical Seal 0.5Inch Elastomer Bellows Mechanical Seal 0

John Crane 21 Single Spring Mechanical Seal 0.5Inch Elastomer Bellows Mechanical Seal 1John Crane 21 Single Spring Mechanical Seal 0.5Inch Elastomer Bellows Mechanical Seal 2John Crane 21 Single Spring Mechanical Seal 0.5Inch Elastomer Bellows Mechanical Seal 3

We are engaged in manufacture and installation exporting and wholesaling quality range of Industrial Seal, Single Spring Seal, Balance and Unbalance Spring Seal, External Mounted Seal, PTFE Bellow External Mounted Seal, Catridge Balance Seal, Multiple Spring Balance Seal, Dry Running Reverse Balance Seal, Agitator Double Acting Unbalance Seal, Single Conical Helical Spring, Rubber Bellow Seal, Multi Spring Seal, Metal Bellow Seal, Elastomer Bellow Seal, Conical Spring Seal, Air Condition Compressor Seal, Auto Cooling Seal, Metallic Bellow Seal,

All ranges of mechanical seals for Flygt Pumps, Grundfos Pumps, Pumps, APV Pumps, Grindes Pumps, Fristam, ABS, Alleeiler, EMU, GEA

Tunchenhagen, Godwin, Hidrostal, Hilge, Johnson, Lowara, Waukesha, Vogelsang Pumps etc.


At the meantime, we could manufacture seals according to your sample or drawing, and design as your request,Customization: Changes of materials for getting other operating parameters are possible. Contact us with your requirements.



Question 1: Are you a factory or a trade company?
Answer: We are a factory and have our top sales for the trade service.


Question 2: Can I try to get a SAMPLE before the order?
Answer: Sure. You can ask for the samples. Usually they're free.


Question 3: Where is your factory located? How can I visit there?
Answer: Our factory is located in Ningbo, China. You can fly to Ningbo or Shanghai airport directly. All our clients, from home or abroad, are warmly welcome to visit us!


Question 4: How does your factory do regarding quality control?
Answer: Quality is priority. We always attach great importance to quality controlling from the very beginning to the very end. Our factory has gained ISO9001 authentication.


Question 5: How about the lead time?
Answer: Within10-20 days after getting the prepayment.


Question 6: How can we pay?
Answer: For small sample shipping cost, you can pay either by paypal or by T/T. And by T/T at sight for large amount of the order.


Question 7: If OEM available?
Answer: Yes, we provide all of our products OEM /ODM service.


Question 8: If I can buy pumps or pump parts from your company?
Answer: Yes , we also provide pumps and pump parts, such as Lobe pumps, Compound & homogeneous pumps, Homogeneous & emulsification pumps and so on

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