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Super-precision angular contact spindle bearing, 25x42x9 mm thin section; 25° contact angle for higher thrust capacity, phenolic cage, universally ground with light preload, P4S / ABEC 7-9. For small grinding spindles, routers and robotics joints.
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| MFR / Brand | SLF |
|---|---|
| MPN | 71905ETP4SUL |
| Model | 71905 E T P4S UL / 2MM9305WI CR SUL |
| Bearing Type | Angular Contact Ball Bearing |
| Condition | New |
|---|---|
| Preload | Light (UL) |
| Base Number | 71905 (ISO); 7905 |
| Common Misspellings | 71905ETP4S UL; 71905-E-T-P4S-UL; 71905 ETP4SUL; 71905ETP4SUI; 7905ETP4SUL; SLF 71905 E T P4S; 71905ETPS4UL |
| Application Types | Small grinding spindles; high-speed router and engraving spindles; dental and medical handpieces; robotics joints; instrument and metrology spindles; semiconductor handling equipment |
| Bore Shaft Size | 25 mm (0.9843 in) |
| Mpn Variants | 71905ETP4SUL; 71905-E-T-P4S-UL; 71905 E T P4S UL; 71905ETP4S; 7905; 71905 |
| Compatible With Replaces | SLF 71905ETP4SUL and Timken 2MM9305WI CR SUL; shares the 25x42x9 mm envelope with SKF 71905 ACD/P4A (25°) and 71905 CD/P4A (15°) - note the 15° C variants are NOT equivalent in thrust capacity or rigidity |
| Arrangement Configuration | Universally ground single (UL); mountable back-to-back (DB), face-to-face (DF) or tandem (DT) without shimming |
| Precision Class | ABEC 7/9 / P4S |
| Additional Attributes | ISO envelope: 71905 / 7905 (25 x 42 x 9 mm); Section note: 42 mm outside diameter on a 25 mm bore is a thin-section 719 series bearing for radially constrained envelopes; Suffix decode - E: 25 degree contact angle; T: phenolic cage; P4S: super-precision class (ABEC 7/9); UL: universally ground, light preload; Contact angle trade-off: 25 degrees carries more axial load and holds thrust more rigidly than the 15 degree C variant in the same envelope, at some cost to speed capability; EAN: 4035804254348; Country of manufacture: Germany; Manufacturer: SLF Spindel- und Lagerungstechnik Fraureuth GmbH; Not published for this reference: dynamic and static load ratings, limiting speed, weight |
| Cage Material | Phenolic |
| Number Of Rows | 1 (single) |
| Contact Angle | 25° |
| Mounting Arrangement | Single universal light preload |
| Design Units | Metric |
| Bearing Class | Super precision |
| Part Number | 71905ETP4SUL |
| Cross Reference 1 | SLF 71905ETP4SUL |
|---|---|
| Cross Reference 2 | 71905 (ISO base designation) |
| Cross Reference 3 | Timken 2MM9305WI CR SUL (equivalent super-precision single, universally ground light preload) |
| Cross Reference 4 | FAG B71905-E-T-P4S-UL (same designation convention, 25°) |
| Cross Reference 6 | SKF 71905 ACD/P4A (same envelope, 25° precision class) |
This is a super-precision angular contact ball bearing in the 25 mm bore x 42 mm outside diameter x 9 mm width envelope — the ISO 71905 size.
The suffixes decode as: E is a 25 degree contact angle, T is the phenolic cage, P4S is the super-precision tolerance class (ABEC 7/9), and UL means universally ground with light preload.
A 25 degree contact angle carries substantially more axial load than the 15 degree alternative in the same envelope, and holds a spindle more rigidly against thrust, at the cost of some speed capability — so it is the choice where a light-section spindle still has to take real cutting thrust. The 42 mm outside diameter on a 25 mm bore makes this a thin-section 719 series bearing, chosen where radial space is tight — typically small grinding spindles, high-speed routers, dental and medical handpieces, robotics joints and instrument spindles.
Universal grinding means any two of these bearings mount together back-to-back (DB), face-to-face (DF) or in tandem (DT) and reach the specified light preload without shimming or custom grinding, so one part number covers every arrangement.
SLF is a German precision bearing manufacturer specialising in spindle and machine-tool bearings. This part also cross-references to Timken 2MM9305WI CR SUL.
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