Single Spring Seal Guide
Engineered to fit. Built to last.
N-line vs SPS- Which seal line should I pick?
- Choose our SPS seals if you want a premium, like-for-like replacement with upgraded materials, finishes, and longevity.
- Choose our N-Line seals if you want maximum compatibility and easy installation , especially in tight/ANSI bores or when you may need to swap springs for different applications.
Refer to our chart or downloadable information sheet to compare popular brands, view product images and see compatible replacements.
Seal House USA Name Brand Cross Over Chart
| Seal House USA Seal | Exact Replica / Equivalent | N Line Can Replace | Product Example 1-1/4″ Seal |
| N11 | Pac-Seal T-21 (standard) Burgmann MG9 | Pac-Seal T-21 U.S. Seal C John Crane 21 | Seal House USA N11 – 185C U.S. Seal PS-185 John Crane T-21 1-1/4″ Pac Seal – S-185 |
| N22 | Pac-Seal T-21 (long w/l) Burgmann MG9 | U.S. Seal E John Crane 1 | Seal House USA N22 – 361C Pac-Seal 361-21 U.S. Seal PS-361 John Crane T-1 1-1/4″ |
| N33 | Pac-Seal T-21 (tapered spring) Burgmann MG9 | U.S. Seal D John Crane 2 | Seal House USA N33 – 381C Pac-Seal S-381 U.S. Seal PS-381 John Crane T-2 1-1/4″ |
| SPS21 | U.S. Seal C John Crane 21 | Seal House USA SPS21 – SPS-185 U.S. Seal PS-185 Pac-Seal S-185 John Crane T-21 1-1/4? | |
| SPS2 | U.S. Seal D John Crane 2 | Seal House USA SPS2 – SPS-381 U.S. Seal PS-381 John Crane T-2 1-1/4″ | |
| SPS1 | U.S. Seal E John Crane 1 | Seal House USA SPS1 – SPS361 U.S. Seal PS-361 John Crane T-1 1-1/4″ |
Questions? Call us anytime- we’re here to help
Single Spring Seal
Single spring mechanical seals equal to industry standard US Seal 1 21, 2, and John Crane 1, 2, 21 Various seal head types N11, N22, N33, G, AV, 166