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Deep Groove Ball Bearings: The Industry Default and When to Reach for Something Else
If you pulled a bearing off general industrial equipment at random, there’s a good chance
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Angular contact thrust ball bearing for ball screw support, 45 mm bore, 100 mm OD, 20 mm wide. NSK 45TAC100ADB, back-to-back (DB) matched pair.
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| MFR / Brand | NSK |
|---|---|
| MPN | 45TAC100ADB |
| Model | 45 TAC 100 A DB / MM45BS100 |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 45 mm |
| OD | 100 mm |
| Width | 20 mm |
| Material | Bearing Steel |
|---|---|
| Series | TAC |
| Base Number | 45TAC100 |
| Industry Terms | Ball screw support bearing; screw support bearing; TAC bearing |
| Common Misspellings | 45TAC10ADB; 45TAC1OOADB; 45TAK100ADB; 45TAC100AD8 |
| Application Types | CNC machine tool ball screw support; precision linear actuator |
| Overall Width | 20 mm |
| Mpn Variants | 45TAC100ADB; 45TAC100A DB; 45TAC100A-DB; MM45BS100; BSB45100-T |
| Additional Attributes | NSK TAC ball screw support family; back-to-back matched pair |
| Rolling Elements | Ball |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Snap Ring Included | No |
| Harmonization Code | 8482.10.50 |
| Mounting Arrangement | Back-to-back (DB) matched pair |
| Bearing Material | Bearing Steel |
| Cross Reference 1 | Timken MM45BS100 |
|---|---|
| Cross Reference 2 | FAG BSB45100-T |
NSK 45TAC100ADB is an angular contact thrust ball bearing for ball screw support, supplied as a back-to-back (DB) matched pair of two single-row bearings. Ball screw support bearings carry thrust along the screw axis and hold the screw in axial position under reversing load.
45TAC100 — NSK’s ball screw support angular contact thrust series. The leading number is the bore in millimetres and the number following TAC is the outside diameter in millimetres, so 45TAC100 is a 45 mm bore in a 100 mm outside diameter.
A — the first design generation within the TAC family.
DB — back-to-back pair. Two single-row bearings supplied as a matched set and mounted with their outer ring backs together.
Rolling Elements: Ball. Number Of Rows: 1 per bearing. Bore Type: Straight. Closure Type: Open. Bearing Material: Bearing steel. Series: TAC. Base Number: 45TAC100. Mounting Arrangement: Back-to-back (DB) matched pair. Unit Quantity: 2 Pcs.
Bore Diameter: 45 mm (1.7717 in), seating on the screw journal. Outside Diameter: 100 mm (3.9370 in), locating in the support housing bore. Overall Width: 20 mm (0.7874 in) per bearing.
Cross-Reference 1: Timken MM45BS100. Cross-Reference 2: FAG BSB45100-T. Both designations are carried on this part’s own carton marking. MPN Variants: 45TAC100ADB, 45TAC100A DB, 45TAC100A-DB, 45 TAC 100 A DB, MM45BS100, BSB45100-T.
Bore 45 mm, outside diameter 100 mm, width 20 mm per bearing.
DB is a back-to-back pair: two single-row bearings supplied as a matched set and mounted with their outer ring backs together.
NSK’s ball screw support series: 45 is the bore in millimetres and 100 is the outside diameter in millimetres.
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