MT502 Elastomer Bellows Mechanical Seal
Direct-fit replacement for John Crane Type 502 | AESSEAL B07 / B07S | Vulcan 1724
MT502 is a unitised full-convolution elastomer bellows seal designed for compact stuffing boxes and general industrial duty. It is a practical, high-quality alternative to the John Crane Type 502 and its common equivalents, giving Australian operators a reliable local-stock option that minimises downtime.
Why Choose the MT502
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Compact length that fits limited gland depths and DIN 24960 / ISO 3069 dimensions without special spacers.
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Self-aligning bellows design that tolerates moderate shaft end-play and run-out.
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Bi-directional with a single coil spring that resists clogging better than multi-spring designs.
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Unitised construction for faster installation and straightforward field handling.
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Proven in water, wastewater, mild chemicals and general process service.
Typical Operating Conditions
| Parameter | Rating |
|---|---|
| Shaft sizes | 14 mm – 100 mm |
| Pressure | Up to 25 bar |
| Speed | Up to 13 m/s |
| Temperature | –30 °C to +200 °C |
Actual limits depend on face materials, elastomer and fluid. Carbon/ceramic or SiC combinations with appropriate elastomers cover the majority of Australian water and light-process applications.
Common Cross-References
| Luwint | John Crane | AESSEAL | Vulcan | Others |
|---|---|---|---|---|
| MT502 | Type 502 | B07 / B07S | 1724 | Sterling 524 / 524S, Lidering LRB50 |
The MT502 is dimensionally interchangeable with these models when fitted with the matching seat (commonly BO-style DIN short seat). Always confirm shaft diameter, face materials and seat type before ordering.
Where It Is Used in Australia
The Type 502 family is a workhorse seal on many centrifugal process pumps with standard DIN stuffing boxes. In Australian industry you will commonly find it (or its equivalents) in:
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Water treatment and wastewater transfer pumps
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Mining dewatering and site water systems
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Agricultural and irrigation pumping stations
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Light chemical, food and general industrial process pumps
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Various European- and Asian-origin centrifugal pumps used across Australian plants
It is particularly useful where the pump has limited axial space and operators need a straightforward, field-serviceable bellows seal rather than a cartridge.
Materials Available
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Seal faces: Carbon, Ceramic, Silicon Carbide (SiC), Sintered SiC, Tungsten Carbide
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Elastomers: Nitrile (NBR), EPDM, Viton (FKM)
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Metal parts: Stainless steel
Material combinations can be selected to suit clean water, mildly abrasive or chemically aggressive fluids.
Sydney stock. Help with selection.
Most sizes are stocked in our Sydney warehouse, with delivery across Australia. Ask us to confirm your size, material combination and dispatch timing.
Contact us for the full PDF catalogue.
📧 Email: wayne@luwintonline.com
Contact: Wayne Liao
Mob: 0433 986 633
Need help matching a seal? Send your pump model, shaft diameter and clear photos of the old seal. Include the liquid and operating conditions.
LUWINT supplies high-quality aftermarket replacement products designed to fit original equipment. We are an independent supplier and are not affiliated with, endorsed by or associated with John Crane, AESSEAL, Vulcan or any other OEM. Brand names are used solely for cross-reference and identification.