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HJ5620 Dual Cartridge Mechanical Seal — Replacement for John Crane Type 5620
HJ5620 Dual Cartridge Mechanical Seal — Replacement for John Crane Type 5620 - Image 2
HJ5620 Dual Cartridge Mechanical Seal — Replacement for John Crane Type 5620 - Image 3

HJ5620 Dual Cartridge Mechanical Seal — Replacement for John Crane Type 5620

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The Formax HJ5620 is a dual cartridge O-ring pusher mechanical seal for compatible industrial pump installations and selected John Crane Type 5620 replacement applications.
Supplier-listed shaft sizes cover 24–140 mm and 1–5.5 inches. Seal face materials, elastomers and metal components are selected for the operating duty, with installation dimensions, pressure limits and support-system requirements confirmed before ordering.

  • Product Overview

The HJ5620 incorporates inboard and outboard sealing assemblies in a cartridge configuration with a sleeve and gland. The assembled construction simplifies handling and installation compared with separately fitted component seals.

O-rings provide secondary sealing within the pusher arrangement. The inboard and outboard face pairings, elastomer compounds and metal grades must suit the process fluid and the selected buffer or barrier liquid.

For replacement applications, compare the complete assembly with the existing seal, pump installation and auxiliary piping. A matching model reference or nominal shaft size alone does not establish interchangeability.

  • Design Features
Feature Description
Seal Arrangement Dual mechanical seal with inboard and outboard sealing assemblies
Construction Cartridge assembly incorporating a sleeve and gland
Seal Technology O-ring pusher configuration
Installation Assembled cartridge construction simplifies component handling and positioning
Metric Shaft Sizes Selected configurations from 24 to 140 mm
Inch Shaft Sizes Selected configurations from 1.000 to 5.500 inches
Material Selection Face, secondary seal and metal options for different operating duties
Auxiliary System Buffer or barrier system selected for the specified seal arrangement
Replacement Selection Configuration-specific review for selected John Crane Type 5620 installations
  • Operating Parameters
Parameter HJ5620 Supplier-Stated Specification
Seal Chamber Temperature −30 to +205°C / −22 to +401°F
Maximum Listed Seal Chamber Pressure Up to 21 bar / 2.1 MPa / approximately 305 psi; size-specific limits require confirmation
Maximum Sliding Velocity Up to 25 m/s / approximately 82 ft/s
Metric Shaft Sizes 24–140 mm, selected configurations
Inch Shaft Sizes 1.000–5.500 inches, selected configurations
Permissible Rotational Speed Confirm for the selected seal size and face diameter
Buffer / Barrier Pressure Specify separately for the selected operating arrangement
Permissible Differential Pressure Confirm for each seal and operating condition

These figures are supplier-listed catalogue limits. Maximum pressure, temperature and sliding velocity must not be assumed to apply simultaneously.

Confirm the allowable operating envelope for the selected size, material combination and support system. The full temperature range does not apply to every elastomer compound. The maximum listed pressure must not be applied to every shaft size without verification.

  • Material Options
Component Supplier-Listed Options Specification Requirements
Seal Faces Carbon graphite Confirm grade, impregnation and mating material
Seal Faces Reaction-bonded silicon carbide — RBSiC Confirm suitability for fluid chemistry and operating duty
Seal Faces Pressureless-sintered silicon carbide — SSiC Confirm grade and application requirements
Seal Faces Tungsten carbide — TC Confirm binder grade and chemical compatibility
Secondary Seals NBR Select according to fluid compatibility and compound temperature limits
Secondary Seals FKM Select according to temperature and chemical exposure
Secondary Seals EPDM For compatible water-based and chemical duties
Secondary Seals FFKM Compound-specific selection for demanding chemical duties
Spring and Metal Components Stainless steel 304 or 316 Confirm the material specified for each component
Spring and Metal Components Hastelloy C-series alloy Exact alloy grade and availability require confirmation

Specify the inboard and outboard face pairings separately. Material selection must account for both the process fluid and the buffer or barrier liquid.

Branded elastomers, special compounds and alloy grades are supplied only when specifically agreed and documented.

  • Dimensions & Installation

The following reference tables are transcribed from the supplied GB-5620 dimensional sheet. Confirm their applicability to the quoted HJ5620 configuration using the matching assembly drawing.

All symbols are retained as shown in the source, including D41Min, D41Max, L922 and L912. These symbols must be interpreted using the corresponding drawing.

  • Metric Dimensional Table — All Dimensions in mm
D1 D3 D41Min D41Max L39 L90 L922 L912 D26 S Dm
24.0 39.7 41.3 48.0 49.6 50.8 44.5 47.7 101.6 13.3 71.2
25.0 39.7 41.3 48.0 49.6 50.8 44.5 47.7 101.6 13.3 71.2
28.0 42.9 44.5 51.2 52.4 54.0 45.4 48.6 104.8 13.3 74.5
30.0 44.5 46.1 56.5 52.4 54.0 45.4 48.6 108.0 13.3 79.9
32.0 46.0 47.6 58.3 52.4 54.0 45.4 48.6 108.0 13.3 81.6
33.0 49.3 50.8 61.5 52.4 54.0 45.4 48.6 111.1 13.3 84.8
35.0 49.3 50.8 61.5 52.4 54.0 45.4 48.6 111.1 13.3 84.8
38.0 55.5 57.2 68.1 54.0 55.5 47.5 50.7 123.8 13.3 91.4
40.0 58.7 60.3 71.4 54.0 55.5 47.5 50.7 127.0 14.3 95.7
43.0 61.1 63.0 74.1 54.0 55.5 47.5 50.7 133.4 14.3 98.4
45.0 61.1 63.0 74.1 54.0 55.5 47.5 50.7 133.4 14.3 98.4
48.0 64.7 66.7 74.1 54.0 55.5 47.5 50.7 133.4 14.3 98.4
50.0 67.9 70.0 76.6 58.7 60.3 51.9 55.0 139.7 14.3 101.6
53.0 71.1 73.0 85.3 58.7 60.3 51.9 55.0 148.8 17.4 113.5
55.0 72.9 75.0 85.3 58.7 60.3 51.9 55.0 148.8 17.4 113.5
58.0 74.2 76.2 88.5 58.7 60.3 51.9 55.0 165.1 17.4 116.0
60.0 77.4 79.4 91.7 62.6 64.2 52.8 56.0 165.1 17.4 119.9
63.0 83.8 85.7 98.8 65.1 66.7 50.3 53.5 171.5 17.4 127.0
65.0 83.8 85.7 98.8 65.1 66.7 50.3 53.5 171.5 17.4 127.0
68.0 90.2 92.1 103.2 63.5 65.1 53.2 56.4 171.5 17.4 131.3
70.0 90.2 92.1 103.2 63.5 65.1 53.2 56.4 171.5 17.4 131.3
75.0 98.1 101.6 113.5 65.1 66.7 51.6 54.8 196.9 20.6 145.3
80.0 102.2 105.0 116.8 63.8 66.9 55.3 58.5 188.9 20.6 148.5
85.0 107.9 111.1 123.2 65.1 68.3 54.0 57.2 206.4 17.4 154.8
90.0 114.3 117.5 129.5 65.1 68.3 54.0 57.2 212.7 17.4 158.6
95.0 117.5 120.0 132.1 65.1 68.3 54.0 57.2 222.3 17.4 172.0
100.0 123.8 127.0 139.7 65.1 68.3 54.0 57.2 228.3† 20.6 171.7
105.0 127.0 130.2 142.9 65.1 68.3 54.0 57.2 238.6† 20.6 174.9
110.0 136.5 139.7 152.4 65.1 68.3 54.0 57.2 241.3 20.6 184.4
115.0 136.5 139.7 152.4 65.1 68.3 54.0 57.2 241.3 20.6 184.4
120.0 142.9 146.1 160.4 65.1 68.3 54.0 57.2 263.5 20.6 192.4
125.0 155.6 171.7 184.4 77.3 80.5 62.8 66.0 304.8 20.6 254.0
130.0 161.9 178.1 190.8 77.3 80.5 62.8 66.0 311.2 20.6 260.4
135.0 168.3 190.5 203.2 77.3 80.5 62.8 66.0 322.3 23.8 266.7
140.0 168.3 190.5 203.2 77.3 80.5 62.8 66.0 322.3 23.8 266.7
  • Inch Dimensional Table — All Dimensions in inches
D1 D3 D41Min D41Max L39 L90 L922 L912 D26 S Dm
1.000 1.564 1.625 1.889 1.954 2.000 1.751 1.876 4.000 0.525 2.806
1.125 1.689 1.750 2.015 2.062 2.125 1.789 1.914 4.125 0.525 2.933
1.250 1.812 1.875 2.294 2.062 2.125 1.789 1.914 4.250 0.525 3.213
1.375 1.939 2.000 2.421 2.062 2.125 1.789 1.914 4.375 0.525 3.338
1.500 2.187 2.250 2.680 2.125 2.187 1.870 1.995 4.875 0.525 3.599
1.625 2.312 2.375 2.812 2.125 2.187 1.870 1.995 5.000 0.562 3.766
1.750 2.405 2.480 2.918 2.125 2.187 1.870 1.995 5.250 0.562 3.872
1.875 2.549 2.625 2.918 2.125 2.187 1.870 1.995 5.250 0.562 3.875
2.000 2.637 2.750 3.015 2.312 2.375 2.042 2.167 5.500 0.562 4.000
2.125 2.798 2.875 3.360 2.312 2.375 2.042 2.167 5.859 0.687 4.469
2.250 2.923 3.000 3.485 2.312 2.375 2.042 2.167 6.500 0.687 4.566
2.375 3.048 3.125 3.610 2.466 2.825† 2.079 2.204 6.500 0.687 4.719
2.500 3.301 3.375 3.891 2.562 2.625 1.982 2.107 6.750 0.687 5.087†
2.625 3.551 3.625 4.062 2.500 2.562 2.094 2.219 6.750 0.687 5.170
2.750 3.551 3.625 4.062 2.500 2.562 2.094 2.219 6.750 0.687 5.170
2.875 3.614 3.750 4.186 2.500 2.562 2.094 2.219 7.000 0.687 5.312
3.000 3.864 4.000 4.469 2.562 2.625 2.032 2.157 7.750 0.812 5.720
3.125 4.022 4.125 4.600 2.562 2.687 2.125 2.250 7.875 0.812 5.845
3.250 4.022 4.134 4.600 2.510 2.635 2.177 2.302 7.437 0.812 5.845
3.375 4.246 4.375 4.850 2.562 2.687 2.125 2.250 8.125 0.812 6.095
3.500 4.371 4.500 4.975 2.562 2.687 2.125 2.250 8.250 0.812 6.220
3.625 4.500 4.625 5.100 2.562 2.687 2.125 2.250 8.375 0.687 6.250
3.750 4.625 4.724 5.199 2.562 2.687 2.125 2.250 8.750 0.687 6.770
3.875 4.750 4.875 5.375 2.562 2.687 2.125 2.250 8.750 0.812 6.636
4.000 4.875 5.000 5.500 2.562 2.687 2.125 2.250 9.000 0.812 6.761
4.125 5.000 5.125 5.625 2.562 2.687 2.125 2.250 9.000 0.812 6.886
4.250 5.125 5.250 5.750 2.562 2.687 2.125 2.250 9.250 0.812 7.011
4.500 5.375 5.500 6.000 2.562 2.687 2.125 2.250 9.500 0.812 7.261
4.750 5.625 5.750 6.313 2.562 2.687 2.125 2.250 10.375 0.812 7.574
5.000 6.125 6.760 7.260 3.043 3.168 2.473 2.598 12.000 0.812 10.000
5.250 6.375 7.010 7.510 3.043 3.168 2.473 2.598 12.250 0.812 10.250
5.500 6.625 7.500 8.000 3.043 3.168 2.473 2.598 12.667† 0.937 10.500

Dimensional Notes

  • Dimensions are catalogue references, not approved manufacturing or installation drawings.
  • Values marked † require confirmation because they differ from the corresponding original-manufacturer reference supplied for comparison.
  • The reference sheet does not list L12. Obtain the complete axial installation dimensions from the matching HJ5620 assembly drawing.
  • Metric and inch configurations are separate assemblies and must not be treated as interchangeable solely by unit conversion.
  • Confirm all dimensions, tolerances, mounting details and port connections before replacement approval.

Installation Compatibility Checklist

Installation Item Information Required
Shaft or Sleeve Diameter, tolerance, surface condition and available length
Seal Chamber Bore diameter, depth and internal clearances
Cartridge Envelope Overall diameter and required axial installation space
Gland Mounting Bolt or stud positions, slot dimensions and mounting clearances
Connection Ports Thread, size, orientation and function of each connection
Equipment Movement Axial movement, shaft runout and alignment requirements
Supporting Drawing Model, size, configuration and drawing revision
  • Dual Seal Arrangement & Support System

Select the seal arrangement together with its auxiliary fluid system. Process pressure, buffer or barrier pressure and differential pressure must be specified separately.

Arrangement or Requirement Selection Details
Unpressurized Dual Arrangement Confirm suitability for operation with buffer liquid below seal chamber pressure
Pressurized Dual Arrangement Confirm suitability for operation with barrier liquid above seal chamber pressure
Fluid Circulation Specify circulation method, flow requirements and any pumping-ring configuration
Cooling Determine heat-removal requirements for the operating duty
Monitoring Specify relevant pressure, temperature and liquid-level monitoring
Operating Sequence Define fluid supply and pressure requirements during start-up, normal operation and shutdown
Pressure Reversal Confirm whether the supplied configuration accommodates the anticipated pressure conditions

Suitability for pressurized or unpressurized operation requires confirmation for the actual supplied HJ5620 assembly.

  • Typical Applications
Application Area Candidate Equipment
Chemical Processing Compatible chemical transfer and process pumps
General Industrial Processing Suitable centrifugal and circulation pumps
Water and Wastewater Compatible treatment and industrial water-service pumps
Pulp and Paper Suitable process and circulation pump duties
Oil Handling Pumps handling compatible oils and lubricating liquids
Other Rotating Equipment Application-specific installations subject to engineering review

Suitability depends on fluid chemistry, lubrication, solids content, pressure, temperature, speed and the support system.

Hazardous fluids, abrasive slurries, crystallising media and mixer or agitator installations require a separate application assessment. Food-processing, pharmaceutical and drinking-water duties require documentation applicable to the actual supplied configuration.

  • John Crane Type 5620 Replacement Compatibility

The Formax HJ5620 is offered for selected John Crane Type 5620 replacement applications. Confirm dimensional fit, materials, operating limits and auxiliary-system compatibility for the exact installation.

Existing Seal Reference Replacement Review
Type 5620 Compare the complete installation dimensions, materials and operating arrangement
Type 5620P Additionally verify pumping-ring provision and circulation requirements
Type 5620VP Additionally verify the seal-head drive configuration and installation requirements
Other 5600 Series Variants Review separately; family membership does not establish interchangeability

Pumping-ring equipment, reversible seal-head construction and component interchangeability are configuration-specific features. They must not be assumed from the replacement reference alone.

  • Standards & Documentation

The supplier lists ISO 3069, DIN 24960 and GB 6556 as reference standards. Confirm the applicable editions, dimensional arrangement and scope of conformity for the selected product.

A standards reference does not establish universal fit across all pump seal chambers. Material certificates, inspection reports, test records and application-specific compliance documents must be agreed before ordering.

  • Frequently Asked Questions
Question Answer
Is HJ5620 a single or dual cartridge seal? It is specified as a dual cartridge mechanical seal with inboard and outboard sealing assemblies.
Is HJ5620 a bellows seal? No. It is an O-ring pusher configuration.
What shaft sizes are listed? The supplied reference tables cover selected metric sizes from 24 to 140 mm and inch sizes from 1.000 to 5.500 inches.
Does HJ5620 include a pumping ring? Pumping-ring availability and configuration must be confirmed in the quotation.
Can every size operate at 21 bar? No blanket rating is claimed. Confirm the allowable pressure for the selected size, materials and operating arrangement.
Can it operate with a pressurized barrier system? This requires confirmation of the supplied configuration, pressure limits and support system.
Is dry running permitted? Dry-running capability is not established by the supplied HJ5620 information.
Does 25 m/s mean 5,000 rpm? No. Sliding velocity and rotational speed are different quantities. Permissible rpm depends on the relevant face diameter and configuration.
Can HJ5620 replace every Type 5620P or Type 5620VP? These variants require separate verification of their features, dimensions and operating requirements.
Are the dimensional tables sufficient for installation approval? No. Use them with the matching assembly drawing and confirm all installation dimensions and tolerances.
What information is needed for a quotation? Existing seal designation, shaft size, drawings, fluid details, operating conditions, support-system information and quantity.
  • Request a Quote

Need an HJ5620 dual cartridge seal or a replacement for your John Crane Type 5620 installation?

Send the existing seal designation, shaft size, installation drawing or photographs, operating conditions and buffer or barrier system details. Formax Fluid will review the information for configuration selection and quotation.

Information to Provide Details
Existing Seal Manufacturer, complete model, size and material codes
Equipment Pump manufacturer and model
Installation Shaft size, seal chamber dimensions and available drawings
Process Fluid Fluid name, concentration and solids content
Operating Conditions Normal and maximum pressure, temperature and shaft speed
Auxiliary System Buffer or barrier fluid, pressure, temperature and circulation method
Order Requirements Quantity and required delivery date

 

John Crane and the referenced product designations belong to their respective owners. Formax Fluid is an independent supplier and is not affiliated with or endorsed by John Crane.

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