DIN/RMA Standard
Bore Dia. |
DIN 3760 (m/m) |
RMA (m/m) |
||
Metal O.D |
Rubber O.D. |
Metal O.D |
Rubber O.D |
|
up to 50 |
+0.10/+0.20 |
+0.15/+0.30 |
+0.08/+0.20 |
+0.15/+0.3 |
up to 80 |
0.13/0.23 |
0.20/0.35 |
0.09/0.23 |
0.20/0.35 |
up to 120 |
0.15/0.25 |
0.20/0.35 |
0.10/0.25 |
0.20/0.35 |
up to 180 |
0.18/0.28 |
0.25/0.45 |
0.12/0.28 |
0.25/0.45 |
up to 300 |
0.20/0.30 |
0.30/0.45 |
0.20/0.35 |
0.30/0.45 |
up to 400 |
0.23/0.35 |
0.30/0.55 |
0.20/0.45 |
0.30/0.55 |
RMA STANDARD
Bore Dia. |
Metal OD |
Rubber OD |
||
Normal Press Fit |
Tolerance |
Normal Press Fit |
Tolerance |
|
up to 2" |
0.005+/-0.002 |
0.008+/-0.003 |
||
+0.003~0.007 |
+0.08~0.17mm |
+0.005~0.011 |
+0.13~0.28mm |
|
up to 3" |
0.0055 +/- 0.0025 |
0.010+/-0.003 |
||
+0.003~0.008 |
+0.08~0.20mm |
+0.007~0.013 |
+0.18~0.33mm |
|
up to 5" |
0.0065+/-0.003 |
0.0105+/-0.003 |
||
+0.0035~0.0095 |
+0.09~0.24mm |
+0.0075~0.0135 |
+0.19~0.34mm |
|
up to 7" |
0.007+/-0.003 |
0.012+/-0.004 |
||
+0.004~0.010 |
+0.10~0.25mm |
+0.008~0.016 |
+0.20~0.40mm |
|
up to 12" |
0.0085+/-0.0035 |
0.0125+/-0.004 |
||
+0.005~0.012 |
+0.13~0.30mm |
+0.0085~0.0165 |
+0.22~0.42mm |
|
up to 20" |
0.012+/-0.005 |
0.015+/-0.005 |
||
+0.007~0.017 |
+0.18~0.43mm |
+0.010~0.020 |
+0.26~0.50mm |
Bore Diameter and Seal O.D. (DIN)
Bore Diameter (mm) | Tolerance Range (H8) | Metal Cased Seal O.D. (mm) | Rubber Covered Seal O.D. (mm) |
Up to 6 |
0 to +18 | +0.10 to +0.20 | +0.15 to +0.30 |
Up to 10 |
0 to +22 | ||
Up to 18 | 0 to +27 | ||
Up to 30 | 0 to +33 | ||
Up to 35 | 0 to +39 | ||
Up to 50 | 0 to +39 | ||
Up to 80 | 0 to +46 | +0.13 to +0.23 | +0.20 to +0.35 |
Up to 120 | 0 to +54 | +0.15 to +0.25 | +0.20 to +0.35 |
Up to 180 | 0 to +63 | +0.18 to +0.28 | +0.25 to +0.45 |
Up to 250 | 0 to +72 | +0.20 to +0.30 | +0.25 to +0.45 |
Up to 300 | 0 to +81 | ||
Up to 315 | 0 to +81 | +0.23 to +0.35 | +0.30 to +0.55 |
Up to 400 | 0 to +89 |
Types of Motion
Types | Choices |
Rotation |
Any type of seal other than TX4 |
Reciprocating | TX4 seals (TC4, TB4.....) |
Media
Media | Choices |
Regular lubricants | Regular seals |
Water, non lubrication liquids | Using two single-lip seals with grease or lubricants in between. |
Chemicals | When sealing element material is not acceptable, try mechanical seal. |
Pressure
Existence of Dust
Environment | Choice |
No Dust | Single-lip Seals ( S Type) |
Dust | Double-lip Seals ( T Type) |
Temperature
Bore | The leading edge must be deburred. A rounded corner or chamfer should be provided. |
Shaft | Remove surface nicks, burrs, grooves, and spiral machine leads. |
Shaft End | Remove burrs or sharp edges. The shaft end should be chamfered in applications where the shaft enters the seal against the sealing lip. |
Dimensions | Be sure that the shaft and bore diameters match those specified for the seal selected. Damage may have occurred prior to installation. A Seal sealing lip that is turned back, cut, or otherwise damaged should be replaced. |
Seal Direction | Make sure that the new seal faces in the same direction as the original one. Generally, the lip faces the lubricant or the fluid to be retained. |
Correct Tools | Press fitting tools should have an outside diameter of 0.3 mm smaller than the bore size. For the best results, the center of the tool should be open so the pressure is applied only at the outer edge. |
Pre-lubricate | Before installation, wipe the sealing element with the lubricant being retained. |
Proper Force | Use proper driving force, such as a soft-face tool, arbor press, or wood. Apply force evenly around the outer edge to avoid cocking the seal. |
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