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Timing Belt Pulleys and V-Belt Sheaves: Matching Belt Drive Components Correctly
Belt drives may appear simple, consisting of two wheels and a belt for power transfer.
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NSK 7906A5TYNSULP4 super-precision angular contact ball bearing, 30 mm bore x 47 mm OD x 9 mm wide, 25° contact angle, ABEC 7 / P4, polyamide cage.
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| MFR / Brand | NSK |
|---|---|
| MPN | 7906A5TYNSULP4 |
| Model | 7906-A5-TYN-SUL-P4 / 71906ACD / 7906E |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 30 mm |
| OD | 47 mm |
| Width | 9 mm |
| Material | Bearing Steel |
|---|---|
| Series | 7900 |
| Preload | Light (L), universally ground |
| Base Number | 7906 / 71906 |
| Industry Terms | super precision angular contact bearing, spindle bearing, ABEC 7 bearing, P4 bearing, universally ground, light preload, 25 degree contact angle, thin section spindle bearing |
| Common Misspellings | 7906A5TYN SULP4, 7906-A5TYNSULP4, 7906AS, NSK 7906 A5, 7906A5TYNSULP4J |
| Application Types | Machine tool spindles, grinding spindles, high-speed milling and boring heads, precision indexing |
| Bore Shaft Size | 30 mm |
| Mpn Variants | 7906A5TYNSULP4, 7906-A5-TYN-SUL-P4, 7906 A5 TYN SUL P4, 7906A5TYNSUL, 7906A5, 71906A5 |
| Manufacturer Status | NSK current production designation; NSK also absorbed RHP, so RHP 7906 numbers share this lineage |
| Compatible With Replaces | NSK 7906A5 spindle positions, 71906 ACD, RHP 7906E, 25° super-precision 30 mm bore spindle bearings |
| Precision Class | ABEC 7 / P4 |
| Additional Attributes | Permissible axial load 4,950 N; effective load center 13.5 mm; da min 32.5 mm; Da max 44.5 mm; ra max 0.3 mm; rb max 0.15 mm; grease 0.29 g |
| Dynamic Load Rating | 9,900 N |
| Static Load Rating | 5,950 N |
| Precision Rating | ABEC 7 / P4 |
| Rolling Elements | Ball |
| Item Weight | 0.050 kg (0.11 lb) |
| Cage Material | Polyamide |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Snap Ring Included | No |
| Harmonization Code | 8482.10.50.28 |
| Contact Angle | 25° |
| Part Number | 7906A5TYNSULP4 |
| Limiting Speed | 26,000 rpm grease; 36,000 rpm oil-air |
| Cross Reference 1 | SKF 71906 ACD/P4A - SKF P4A class, 25 deg |
|---|---|
| Cross Reference 2 | FAG B71906-E-T-P4S - FAG P4S class, 25 deg |
| Cross Reference 3 | RHP 7906ETP4 - RHP P4, 25 deg |
| Cross Reference 4 | Fafnir 3MM9106WICR - Timken MM class, 25 deg |
| Cross Reference 5 | NSK 7906A5TYNDULP4 - factory matched pair, 25 deg |
| Cross Reference 6 | SKF 71906 CD/P4A - 15 deg, not 25 deg |
| Cross Reference 7 | NSK 7906A - 30 deg, not 25 deg |
| Cross Reference 8 | NSK 7906CTYNSULP4 - 15 deg, not 25 deg |
The NSK 7906A5TYNSULP4 is a single-row super-precision angular contact ball bearing, 30 mm bore x 47 mm outside diameter x 9 mm wide, 25° contact angle, in the 71906 / 7906 spindle envelope. Moulded polyamide cage, universally ground for light preload, ISO Class 4 (P4). Unit Quantity: 1 Pc. One bearing.
7906 — single-row angular contact ball bearing, 19-series thin section, 30 x 47 x 9 mm.
A5 — NSK contact angle code for 25° (C = 15°, A5 = 25°, A = 30°).
TYN — polyamide cage.
SU — single bearing, universally ground.
L — light preload.
P4 — ISO tolerance class 4, equivalent to ABEC 7.
Bore Diameter: 30 mm. Outside Diameter: 47 mm. Width: 9 mm. Contact Angle: 25°. Number Of Rows: 1. Rolling Elements: Ball. Cage Material: Polyamide. Precision Class: ABEC 7 / P4. Preload: Light (L). Closure Type: Open. Dynamic Load Rating: 9,900 N. Static Load Rating: 5,950 N. Limiting Speed: 26,000 rpm grease; 36,000 rpm oil-air. Permissible Axial Load: 4,950 N. Item Weight: 0.050 kg (0.11 lb). Country of Origin: Japan.
Chamfer r min: 0.3 mm. Chamfer r1 min: 0.15 mm. Effective Load Center a: 13.5 mm. Shaft abutment da min: 32.5 mm. Housing abutment Da max: 44.5 mm, Db max: 45.8 mm. Fillet ra max: 0.3 mm, rb max: 0.15 mm. Recommended grease quantity: 0.29 g per bearing. Light preload in DB or DF arrangement: 74 N, axial rigidity 78 N/µm.
25° bearings in the 30 x 47 x 9 mm envelope: SKF 71906 ACD/P4A, RHP 7906ETP4, FAG B71906-E-T-P4S, Fafnir 3MM9106WICR. Factory matched pair: NSK 7906A5TYNDULP4. Same envelope at other angles: NSK 7906CTYNSULP4 and SKF 71906 CD/P4A at 15°, NSK 7906A at 30°. Source data: NSK engineering page 7906A5TYNSULP4.
30 mm bore x 47 mm OD x 9 mm wide, 25° contact angle.
Dynamic Load Rating: 9,900 N. Static Load Rating: 5,950 N. Limiting Speed: 26,000 rpm grease; 36,000 rpm oil-air.
SUL is a single bearing, universally ground, light preload. P4 is ISO Class 4, equivalent to ABEC 7.
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