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    • Mechanical Seals

    Source mechanical seals from India's verified manufacturers and exporters on Himalay. Browse the full range for industrial and export applications.

    Showing 11 items11 items
    Mechanical Seal Kit / Pump Seal Kit
    Mechanical Seal Kit / Pump Seal Kit$4 - $28
    Agitator / Mixer Mechanical Seal
    Agitator / Mixer Mechanical Seal$200 - $1,700
    Split Mechanical Seal
    Split Mechanical Seal$300 - $2,000
    Dry Running Mechanical Seal
    Dry Running Mechanical Seal$120 - $900
    Slurry Mechanical Seal
    Slurry Mechanical Seal$90 - $700
    PTFE Bellows Mechanical Seal
    PTFE Bellows Mechanical Seal$35 - $300
    Rubber Bellows Mechanical Seal
    Rubber Bellows Mechanical Seal$4 - $20
    Metal Bellows Mechanical Seal
    Metal Bellows Mechanical Seal$140 - $900
    Cartridge Mechanical Seal
    Cartridge Mechanical Seal$90 - $500
    Multi Spring Mechanical Seal
    Multi Spring Mechanical Seal$12 - $50
    Single Spring Mechanical Seal
    Single Spring Mechanical Seal$8 - $30
    Mechanical Seals sourcing

    About Mechanical Seals

    Mechanical seals across 5,760 listed configurations — 7 face-material pairs from general-duty to severe abrasive/sour-service, shaft 10mm to 400mm, to API 682 and EN 12756.

    A mechanical seal is a rotating shaft seal that holds two flat faces — one fixed, one rotating with the shaft — in contact under spring or bellows load, preventing process fluid from leaking along a pump, mixer or compressor shaft where a static gasket cannot work. It replaces packed-gland sealing wherever leak-free, low-friction operation is required. Himalay lists seven face-material pairs, splitting into two duty tiers. Three general-duty pairs — Carbon Graphite vs Silicon Carbide, Tungsten Carbide vs Carbon, and Carbon vs Ni-resist cast iron — cover shaft sizes 10mm to 150mm, standard-commercial or FDA food-contact certification, and low-to-high operating pressure. Four severe-duty pairs — SiC vs SiC, Tungsten Carbide vs Tungsten Carbide, Carbon vs Stellite hard-faced, and diamond-coated SiC vs SiC — cover shaft sizes 90mm to 400mm, sour-service and offshore certification (NACE MR0175, NORSOK M-710), and pressure up to ultra-high (>300 bar). Gland/secondary materials run from 316 stainless and duplex on the general-duty tier to Hastelloy C-276, Inconel 625/718, Titanium and Monel on the severe-duty tier — ten materials in total. Design class follows API 682's Type A (pusher, elastomer secondary) through Type B/C (metal bellows) and single/dual piping plans (Plan 11/13/14 single, Plan 52 dual-unpressurized, Plan 53A/B/C dual-pressurized). Design standard is API 682, referenced alongside ISO 21049, DIN 24960 and EN 12756. API 682's officially published scope covers pump shaft diameters 20mm to 110mm; Himalay's catalogue extends beyond that into larger agitator/mixer shaft sizes, specified against the same API 682 design classes and piping plans. State shaft diameter, duty tier and process fluid in your enquiry.

    Buyer guide

    Specifying Mechanical Seals: Duty Tier, Face Material and Piping Plan

    01

    Two flat faces under load is the entire mechanism

    A mechanical seal holds a fixed ring and a shaft-mounted rotating ring together, face to face, under spring or bellows preload, with a thin fluid film between them doing double duty as lubricant and barrier. That's the functional difference from a packed gland (which seals by friction against the shaft directly) or a static gasket (which has no rotating element at all) — a mechanical seal is specified wherever continuous shaft rotation meets a process fluid that cannot be allowed to leak along the shaft.

    02

    Duty tier is the first decision, and it drives almost everything downstream

    Himalay's catalogue splits its seven face-material pairs into a general-duty tier (Carbon Graphite vs Silicon Carbide, Tungsten Carbide vs Carbon, Carbon vs Ni-resist cast iron) and a severe-duty tier (SiC vs SiC, Tungsten Carbide vs Tungsten Carbide, Carbon vs Stellite hard-faced, diamond-coated SiC vs SiC). General-duty pairs cover shaft sizes 10mm to 150mm at standard-commercial or FDA food-contact certification; severe-duty pairs cover 90mm to 400mm at sour-service (NACE MR0175/ISO 15156) or offshore (NORSOK M-710) certification, with pressure running up to ultra-high (>300 bar). The two tiers overlap only at the 90-150mm shaft band. Abrasive slurry, high solids content or sour/H2S service pushes the selection toward the severe-duty tier regardless of shaft size; clean or moderately loaded service stays in general-duty.

    03

    Gland material follows the same tier split

    General-duty seals list 316 stainless (CF8M) or duplex/super-duplex gland material — two options. Severe-duty seals add six more: Alloy 20 and CN-7M for sulfuric/phosphoric service, Hastelloy C-276 for aggressive chemicals, Inconel 625/718 for high-temperature corrosive duty, Titanium Gr2/Gr5, and Monel 400/K-500 for seawater or hydrofluoric acid service. Ten gland materials total across the family — check chemical compatibility tables against your actual process fluid before specifying an exotic alloy purely on the strength of "severe duty."

    04

    Design class and piping plan follow API 682's own structure

    Type A is a pusher-seal design with an elastomer secondary seal, the simplest and most common construction. Type B and Type C step up to metal-bellows construction for higher-temperature service, removing the elastomer as a wear item. Single seals run API Plan 11, 13 or 14 piping (flush from the pump discharge, various routing); dual-unpressurized seals run Plan 52 with a buffer fluid at lower pressure than the process; dual-pressurized seals run Plan 53A, 53B or 53C with a barrier fluid held above process pressure, for zero-leakage duty. The general-duty tier lists Cat 1/2/3 (API 682's category system, distinct from the Type/Plan system) plus Type A only; the full Type A/B/C and Plan 11-53 range sits on the severe-duty tier.

    05

    Size range and API 682's actual scope don't fully overlap — check this before assuming a size is covered

    API 682's officially published scope is pump shaft diameters 20mm to 110mm. Himalay's catalogue runs from 10mm shafts (small pumps) up through 250-400mm shafts (mega/agitator duty) — the top end sits well outside API 682's base dimensional scope, even though the seal is specified against the same API 682 design classes and piping-plan logic. For shafts inside 20-110mm, API 682's dimensional tables apply directly; for shafts outside that range, confirm the actual seal-cavity dimension against EN 12756/ISO 3069 with your enquiry rather than assuming API 682's base tables extend automatically.

    06

    Standards

    API 682 governs selection, design, testing and piping-plan arrangement; EN 12756 governs the pump-cavity installation dimensions, designation and material coding that a seal is actually fitted into, per ISO 3069. Both are cited together on every catalogue row, alongside ISO 21049 and DIN 24960.

    From spec to RFQ

    State shaft diameter, process fluid and abrasive/solids content (to confirm duty tier), required certification (food-contact, sour-service, offshore), and design class or piping plan if already engineered. Share your pump make/model or stuffing-box drawing with your RFQ — seal-cavity dimensions are pump-specific, not universal.

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    Technical guide

    How Mechanical Seals Work

    Mechanism (mechanics): two lapped-flat faces held together by spring and hydraulic force, riding on a thin fluid film

    A mechanical seal restrains shaft leakage using "two very flat surfaces (one stationary and one rotating)" mounted perpendicular to the shaft, where "the very close (near) contact between these two flat mating surfaces...minimizes leakage." Contact is not literally dry: "a spring member...maintain[s] face contact," while a thin boundary layer of gas or liquid lubricates the interface itself and carries away frictional heat. On higher-duty designs the faces carry shallow machined grooves so that "during rotation the grooved rotor draws fluid...into the groove structure and builds a fluid film between the rotor and the opposing (stationary) face" — that pressurised film "supports the load, separates the faces, and reduces wear," letting the pair run essentially non-contact once the shaft is turning. Himalay's catalogue reflects the same split between simpler and higher-duty running gear through its API 682 Type A pusher design (elastomer secondary seal) against Type B/C metal-bellows designs.

    Industries served: anywhere a rotating shaft crosses a fluid boundary that cannot be allowed to leak

    Mechanical seals are the standard shaft-sealing device on water and wastewater pumps, including submersible units and pumps handling "viscous, abrasive, or thermosetting liquids" as well as toxic or hazardous fluids. Hydrodynamic-face designs specifically extend that reach into "aerospace (gas turbine auxiliary power units), petrochemical processing, electric vehicle drivetrains" and "high-speed pumps and compressors" — duty where an external flush line to cool and lubricate the faces is impractical, so the seal has to generate its own film. Himalay's own range spans 5,760 configurations across that same spread of duty, from general-duty pairs at standard-commercial or FDA food-contact certification through severe-duty pairs at sour-service (NACE MR0175) and offshore (NORSOK M-710) certification.

    Standards landscape: an American Petroleum Institute selection standard, paired with a European dimensional standard

    API Standard 682, formally "Pumps — Shaft Sealing Systems for Centrifugal and Rotary Pumps," was developed by a task force the American Petroleum Institute established in 1990 to "assist in the selection and operation of end face mechanical seals in centrifugal pumps," and is now in its 4th edition, published 2014. It draws on "the combined knowledge and experience of seal manufacturers, engineering companies, and end users" to set default seal type, arrangement, materials and piping plan, aiming for "at least three years of uninterrupted service while complying with emissions regulations." Though written for petroleum, gas and chemical duty, it "is often referenced for other types of equipment and industries" beyond that origin — which is why Himalay specifies larger agitator/mixer shaft sizes against the same API 682 design classes even outside the standard's own 20-110mm base scope. EN 12756 works alongside it as the dimensional counterpart, governing the principal internal cavity dimensions, designation and material coding for fitting a seal into a pump per ISO 3069: API 682 sets what the seal must do, EN 12756 sets what shape it has to be to fit. Sources: [Water Tech Online — Back to Basics: Mechanical Seals for Water and Wastewater Pumps](https://www.watertechonline.com/wastewater/article/16192248/back-to-basics-mechanical-seals-for-water-and-wastewater-pumps); [Wikipedia — Hydrodynamic seal](https://en.wikipedia.org/wiki/Hydrodynamic_seal); [Wikipedia — API Standard 682](https://en.wikipedia.org/wiki/API_Standard_682)

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    Frequently Asked Questions

    Which face-material pair do I need?
    Which gland or secondary material suits my process fluid?
    What do the API 682 design classes and piping plans mean?
    Does API 682 cover my shaft size?
    API 682 or EN 12756 — which governs what?
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