SB20
Lowest friction single-lip PTFE rotary shaft seal
This machined low-torque seal lip design extends seal life within its pressure limits. It is capable of handling extreme temperature, aggressive media, high surface speeds, and can even run dry. The soft seal OD eliminates damage to housings manufactured from expensive metals. An integrated O-ring on the OD of the seal serves as an anti-rotation device and provides positive static sealing between the seal and the bore. Typical applications are dust/dirt excluders, balanced spindles, conveyers. Small quantities are available in 2-4 days.
Operating Range
| Material | Continuous Pressure | Max.Pressure Spike | Temperature | Surface Speed | Application | Dry-run | PV-Rating |
|---|---|---|---|---|---|---|---|
| Permachem 6233 | 30psi (2bar) | 40psi (2.7bar) | -58 to 400°F (-50 to 200°C) | Up to 10,000 fpm (50m/s) | standard oil lubrication, high waterbased fluids | YES | 4.4 |
| Permachem 6235 | 30psi (2bar) | 40psi (2.7bar) | -58 to 400°F (-50 to 200°C) | Up to 10,000 fpm (50m/s) | Soft shaft material, gaseous media, FDA compliant | YES | 4.4 |
| Duraloy 4736 | 30psi (2bar) | 40psi (2.7bar) | -58 to 400°F (-50 to 200°C) | Up to 10,000 fpm (50m/s) | low wear and abrasion, long service life | YES | 4.4 |
Size Table (Inch)Standard Range sizes listed below are preferred sizes for new design applications; however, we offer any other seal size as required.Seals are available for any shaft diameter size in 0.001 inch increments, including Functional Range.
| A Shaft Diameter | CS Cross-section | D Bore Diameter | B without wiper lip +/- 0.010 | B with wiper lip +/- 0.010 | L | F | C | R | |||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Standard Range | Functional Range | Tolerance | * | D= | Tolerance | B= | B= | +0.012/-0 | +/-0.010 | min. | max. |
| 0.315 - 0.999" | 0.315 - 5.000" | +/-0.003 | 1/4 | A + 0.500 | +/-.001 | A + 0.030 | A + 0.120 | 0.262 | 0.223 | 0.070 | 0.020 |
| 1.000 - 5.999" | 0.315 - 18.000" | +/-0.003 | 3/8 | A + 0.750 | +/-.001 | A + 0.030 | A + 0.120 | 0.300 | 0.255 | 0.085 | 0.020 |
| 6.000 - 15.999" | 0.500 - 26.000" | +/-0.004 | 1/2 | A + 1.000 | +/-.002 | A + 0.035 | A + 0.120 | 0.375 | 0.310 | 0.090 | 0.030 |
| 16.000 - 25.999" | 0.500 - 26.000" | +/-0.006 | 5/8 | A + 1.250 | +/-.003 | A + 0.040 | A + 0.120 | 0.512 | 0.425 | 0.100 | 0.030 |
| 26.000 - 63.000" | consult with Ahpseals engineering | ||||||||||
| *Standard cross-sections (CS) listed and non-standard sizes can be provided for any shaft size up to 63 inches. Surface finish: Shaft (A) plunge ground, zero lead Ra 6-12µin - Housing (D,L) Ra max.32µin - Shaft material hardness 55-65RC. Use of installation tool is highly recommended. See Technical Info for more specific information. | |||||||||||
Seal Housing Drawing