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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 7918A5TYSULP4 super precision angular contact ball bearing, 90 x 125 x 18 mm, 25 degree contact angle, ABEC 7 / P4, light preload, dynamic rating 49,500 N.
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| MFR / Brand | NSK |
|---|---|
| MPN | 7918A5TYSULP4 |
| Model | 7918-A5-TY-SUL-P4 |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 90 mm |
| OD | 125 mm |
| Width | 18 mm |
| Material | Chrome Steel |
|---|---|
| Series | 7900 |
| Preload | Light |
| Base Number | 7918A5 |
| Industry Terms | Super precision angular contact bearing; machine tool spindle bearing; precision spindle bearing |
| Common Misspellings | 7918A5TYSUPL4; 7918A5 TY SUL P-4; 7918A5TSULP4; NSK 7918 A5TY |
| Application Types | Machine tool spindles; grinding spindles; high-speed rotating equipment; precision gearboxes |
| Overall Width | 18 mm |
| Mpn Variants | 7918A5TYSULP4; 7918-A5-TY-SUL-P4; 7918 A5 TY SUL P4; 71918 |
| Precision Class | ABEC 7 / P4 |
| Additional Attributes | Effective load centre a 34.1 mm; permissible axial load 33,500 N; recommended grease quantity 3.4 g per bearing; shaft abutment da min 97 mm; housing abutment Da max 118 mm, Db max 120 mm; chamfer r min 1.1 mm, r1 min 0.6 mm; max shaft fillet ra 1 mm, max housing fillet rb 0.6 mm |
| Cage Type | Ball-guided |
| Dynamic Load Rating | 49,500 N per bearing |
| Static Load Rating | 43,500 N per bearing |
| Rolling Elements | Ball |
| Item Weight | 0.560 kg (1.23 lb) per bearing |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Snap Ring Included | No |
| Limiting Speed | 9,400 rpm grease; 14,000 rpm oil |
| Lubricant | Grease or oil |
| Harmonization Code | 8482.10.50.28 |
| Contact Angle | 25° |
| Mounting Arrangement | Universal single, flush-ground |
| Bearing Material | Bearing steel |
| Closure Type | Open |
| Cross Reference 1 | SKF 71918 ACD/P4A |
|---|---|
| Cross Reference 2 | FAG B71918-E-T-P4S |
| Cross Reference 3 | NTN 7918UAD |
| Cross Reference 4 | Timken Fafnir 3MM9318WI |
| Cross Reference 5 | RHP 7918A5 |
NSK 7918A5TYSULP4 super precision angular contact ball bearing, single bearing, on the ISO 71918 envelope. Bore Diameter: 90 mm. Outside Diameter: 125 mm. Overall Width: 18 mm. Contact Angle: 25°. Precision Class: ABEC 7 / P4. Rolling Elements: Ball. Number Of Rows: 1. Bore Type: Straight. Closure Type: Open. Bearing Material: Bearing steel. Unit Quantity: 1 Pc.
7918 — NSK’s number for the 90 x 125 x 18 mm super precision angular contact size. The ISO equivalent is 71918.
A5 — 25° contact angle.
TY — ball-guided cage.
SU — single bearing, universally ground faces, so a pair of them mounts back-to-back, face-to-face or in tandem.
L — light preload.
P4 — ISO class 4, ABEC 7.
Dynamic Load Rating: 49,500 N (11,128 lbf) per bearing. Static Load Rating: 43,500 N (9,780 lbf) per bearing. Limiting Speed: 9,400 rpm grease; 14,000 rpm oil-air. Lubricant: grease or oil. Permissible axial load: 33,500 N. Cage Type: Ball-guided. Preload: Light. Item Weight: 0.560 kg (1.23 lb) per bearing.
Effective load centre a: 34.1 mm. Shaft abutment diameter da min: 97 mm. Housing abutment diameter Da max: 118 mm. Housing abutment diameter Db max: 120 mm. Bearing chamfer r min: 1.1 mm and r1 min: 0.6 mm. Maximum shaft fillet radius ra: 1 mm. Maximum housing fillet radius rb: 0.6 mm. Recommended grease quantity: 3.4 g per bearing. Mounting Arrangement: universal single, flush-ground.
Cross-references: SKF 71918 ACD/P4A, FAG B71918-E-T-P4S, NTN 7918UAD, Timken Fafnir 3MM9318WI, RHP 7918A5.
Bore 90 mm, outside diameter 125 mm, width 18 mm.
A5 is NSK’s 25° contact angle code.
Dynamic Load Rating: 49,500 N. Static Load Rating: 43,500 N. Limiting Speed: 9,400 rpm grease; 14,000 rpm oil-air.
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