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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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2 in stock
Super-precision angular contact ball bearing, 105 x 160 x 26 mm, 25° contact angle, light preload, phenolic cage, ABEC 7 / P4. Fafnir 3MM9121WI SUL.
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| MFR / Brand | Fafnir |
|---|---|
| MPN | 3MM9121WI SUL |
| GTIN | 087796340565 |
| Model | 3MM9121WICRSUL 7021 |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 105 mm |
| OD | 160 mm |
| Width | 26 mm |
| Material | Bearing Steel |
|---|---|
| Series | 9100WI |
| Lubricant | Grease or oil |
| Preload | Light |
| Base Number | 3MM9121WI |
| Overall Width | 26 mm |
| Mpn Variants | 3MM9121WICRSUL; 3MM9121WI-CR-SUL; 3MM-9121-WI-CR-SUL; 3 MM 9121 WI CR SUL; 3MM9121WI; 7021 |
| Precision Class | ABEC 7 / P4 |
| Additional Attributes | Shaft backing shoulder 115.7 mm; housing backing shoulder 150 mm; max fillet radius cleared 2 mm; Timken C1 92,100 N at 1 million revolutions |
| Dynamic Load Rating | 92,100 N |
| Static Load Rating | 84,500 N |
| Precision Rating | ABEC 7 / P4 |
| Rolling Elements | Ball |
| Item Weight | 1.617 kg (3.57 lb) |
| Cage Material | Phenolic |
| Limiting Speed | 7,900 rpm grease; 14,200 rpm oil |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Snap Ring Included | No |
| Harmonization Code | 8482.10.50.28 |
| Contact Angle | 25° |
| Mounting Arrangement | Single universally ground (SUL) |
| Bearing Material | Chrome steel |
| Closure Type | Open |
| Cross Reference 1 | SKF 7021 ACD/P4A |
|---|---|
| Cross Reference 2 | NSK 7021A5TRSULP4 |
| Cross Reference 3 | Timken 7021AC-T-P4S-SUL - P4S class |
| Cross Reference 4 | FAG B7021-E-T-P4S-UL - P4S class |
| Cross Reference 5 | 7021AC (related, standard precision, same envelope and angle) |
Fafnir 3MM9121WI-CR-SUL super-precision single-row angular contact ball bearing, 9100WI spindle series, 105 x 160 x 26 mm. Single universally ground bearing, light preload. Unit Quantity: 1 Pc. GTIN: 087796340565.
3MM — 25° contact angle in the Fafnir scheme; MM is the P4 precision class (ABEC 7).
9121 — 9100WI series, which maps to the ISO 70xx dimension series; bore code 21 gives a 105 mm bore and the ISO equivalent size 7021.
WI — low shoulder on both rings, the spindle bearing form.
CR — phenolic cage.
SUL — single universally ground bearing, light preload.
Bore Diameter: 105 mm. Outside Diameter: 160 mm. Overall Width: 26 mm. Contact Angle: 25°. Precision Class: ABEC 7 / P4. Cage Material: Phenolic. Rolling Elements: Ball. Bearing Material: Chrome steel. Bore Type: Straight. Closure Type: Open. Number Of Rows: 1. Preload: light. Item Weight: 1.617 kg (3.57 lb). Dynamic Load Rating: 92,100 N (Timken C1, 1 million revolutions). Static Load Rating: 84,500 N. Limiting Speed: 7,900 rpm grease; 14,200 rpm oil. Lubricant: grease or oil.
Shaft Backing Shoulder Diameter: 115.7 mm (4.560 in). Housing Backing Shoulder Diameter: 150 mm (5.910 in). Maximum fillet radius cleared by the bearing corners: 2 mm (0.079 in). Mounting Arrangement: single universally ground, light preload.
Cross-references at 25° contact angle, light preload: SKF 7021 ACD/P4A and NSK 7021A5TRSULP4. Timken 7021AC-T-P4S-SUL and FAG B7021-E-T-P4S-UL are P4S class. A standard-precision 7021AC has the same envelope and angle. Also written 3MM9121WI, 3MM-9121-WI-CR-SUL and 7021.
Bore 105 mm, outside diameter 160 mm, width 26 mm.
3MM is a 25° contact angle.
Timken publishes a dynamic load rating of 92,100 N, a static load rating of 84,500 N and a limiting speed of 7,900 rpm on grease and 14,200 rpm on oil.
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