Grundfos Mechanical Seal Replacements

Grundfos Mechanical Seal Replacements

Drop-in Grundfos mechanical seal replacements for CR, CRI, CRN and other pump ranges — built to OEM cartridge dimensions at manufacturer-direct pricing.

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CR / CRI / CRN cartridges · SiC / SiC · Carbon / SiC · OEM dimensions · Custom

We are the manufacturer, not a reseller — we build in-house and supply at quantities that work for a distributor, an OEM or a maintenance department.

Drop-in fit

to Grundfos CR/CRI/CRN envelopes

OEM dimensions

matched faces, springs and hardware

Cost savings

manufacturer-direct vs OEM pricing

Why a Grundfos-compatible seal

  • Same fit, lower cost — built to Grundfos dimensions so the Grundfos mechanical seal replacement drops into the same pump.
  • Cartridge convenience — pre-set units for the CR multistage range, with no field setting.
  • Matched materials — carbon/SiC for clean water, SiC/SiC and FFKM for harder and chemical duty.
  • Obsolete models covered — discontinued Grundfos seals reverse-engineered from a sample.

Most Grundfos ranges use cartridge seals — see our cartridge mechanical seals.

What we supply

Drop-in equivalents across the Grundfos range, OEM-compatible or fully custom.

CR / CRI / CRN cartridges

Drop-in cartridge seals for the Grundfos multistage CR range, pre-set and ready to fit.

Single seal equivalents

Component single seals for smaller Grundfos circulators and end-suction pumps.

Custom & obsolete

Non-standard or discontinued Grundfos seals machined from a sample or drawing.

Match the seal to your Grundfos pump

Range and media set the cartridge and face pair. Send the pump model or the old seal and we confirm. The table is a starting point.

Grundfos rangeFormFace pairElastomer
CR clean waterCartridgeCarbon / SiCEPDM
CRN chemicalCartridgeSiC / SiCFFKM
CRI mild dutyCartridgeCarbon / SiCEPDM
Hot waterCartridgeSiC / SiCViton
OEM-compatible equivalents built to the original envelope — not sold as genuine Grundfos parts.

Go deeper: Cartridge seals  ·  all seal types.

Grundfos Mechanical Seal Dimensions

Installation dimensions (mm) by shaft size for standard Grundfos mechanical seal replacements. Confirm against your pump before ordering — or send the model and we check it for you.

Shaft d6 d7 d11 d12 l2 l4 l5 l8 l9 l10 l11 l12 l13 l14 l28
10 17 21 15.5 19.2 12 14 15 17.5 10 7.5 9 7.5 7.1 6.6 6.6
12 17 21 15.5 19.2 12.8 12 18.5 17.5 10 7.5 10 6.5 7.6 5.6 6.6
14 19 23 17.5 21.6 13 12 18.5 17.5 10 7.5 10 6.5 7.6 5.6 6.6
16 21 25 20.5 24.6 12.8 12 18.5 17.5 10 7.5 11 7.5 8.6 6.6 7.5
18 27 33 24 30 14.5 13.5 20.5 19.5 11 8.5 12.5 9 10 8 7.5
20 29 35 29.5 35 14.5 13.5 20.5 19.5 11 8.5 12.5 9.5 10 7.5 7.5
22 31 37 29.5 35 14.5 13.5 20.5 19.5 11 8.5 12.5 9.5 10 7.5 7.5
24 33 39 32 38 14.3 13.3 20.3 19.5 11 8.5 12.5 8.5 9.5 7.5 7.5
26 35 40 34 40 14 13 20 19.5 11.5 8.5 13 9 10 8 7.5
28 37 43 36 42 13.5 12.5 19.5 19.5 11.5 8.5 14 10 11 9.5 7.5
30 39 45 39 45 13 12 19 19.5 11.5 8.5 14 11 11 10.5 7.5
32 42 48 42.2 48 13 12 19 19.5 11.5 8.5 14 11.5 11 10.5 7.5
35 44 50 46.2 52 13 12 19 19.5 11.5 8.5 14.5 12 11.5 11 7.5
38 49 56 49.2 55 14 13 20 22 14 10 14.5 11.3 11.5 10.3 9
40 51 58 51 58 14 13 20 22 14 10 14.5 12 11.5 10.8 9
42 54 61 53.3 62 14 13 20 22 14 10 17 13.2 14.3 12 9
45 56 63 55.3 64 14 13 20 22 14 10 17 13.2 14.3 12 9
48 59 66 59.7 68.4 14 13 20 22 14 10 17 12.8 14.3 11.6 9
50 60 70 60.8 69.9 14.5 13.5 20.5 23 15 10.5 17 12.4 14.3 11.6 9.5
53 65 73 63.8 72.3 14.5 13.5 20.5 23 15 12 18 13.5 15.3 12.3 11
55 67 75 66.5 75.4 14.5 13.5 20.5 23 15 12 18 14.5 15.3 13.3 11
58 70 78 69.6 78.4 14.5 13.5 20.5 23 15 12 18 14.5 15.3 13.3 11
60 72 80 71.5 80.4 14.2 13.5 20.5 23 15 12 18 14.5 15.3 13.3 11
63 75 83 74.5 83.4 14.2 13.5 20.5 23 15 12 18 14.2 15.3 13.7 11
65 77 85 76.6 85.4 14 13.5 20.5 23 15 12.5 19 14.9 16 13.7 11.3
68 81 90 82.7 91.5 14.2 13.5 20.5 25 18 12.5 19 14.2 15 13.7 11
70 83 92 83.3 93.2 14.5 14 21.5 25 18 12.5 19 14.6 16 14.3 11.3
75 88 97 90.2 99 15.2 14.5 21.5 26 18 12.5 19 15.2 15.3 14.8 11.3
80 95 105 95.2 104 15.7 15 22 26.2 18.2 13 19 16.2 16.3 14.8 12
85 100 110 100.2 109 15.7 15 22 26.2 18.2 15 19 16 16.3 14.8 14
90 105 115 105.2 114 15.7 15 22 26.2 18.2 15 19 16 16.3 14.8 14
95 110 120 110.6 119.4 15.7 15 22 26.2 17.2 15 17 15.8 17 15.8 14
100 115 125 114.5 123.3 15.7 15 22 26.2 17.2 15 17 15.8 17 15.8 14

Grundfos-Compatible Seal FAQ

Are these genuine Grundfos seals?

No — they are OEM-compatible equivalents built to Grundfos dimensions at manufacturer-direct pricing. They are not sold as genuine Grundfos parts.

Will it fit my CR/CRI/CRN pump?

Built to the same cartridge envelope as the original. Send the Grundfos pump model or the old seal and we confirm the fit before quoting.

Can you match obsolete Grundfos seals?

Yes — we reverse-engineer discontinued models from a sample or drawing.

How much can I save versus OEM?

As the manufacturer we supply direct, typically well below OEM list, without down-speccing materials.

Source Grundfos-Compatible Seals At Scale

OEM-compatible, custom-machined and private-label Grundfos equivalents built in-house to your spec, at low minimums. Send a pump model or a sample and we’ll quote.

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All seal types

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