SB20R
Extreme temperature low friction single-lip PTFE rotary shaft seal
This machined low torque seal lip design extends seal life within its pressure limits. A metallic thermal control ring provides dimensional control under thermal cycling conditions. It is capable of handling extreme temperature, aggressive media, high surface speed , low pressure 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, and 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 |
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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