The Bearing Unit,ball, cataloged under National Stock Number 3130-00-490-5050, is classified within Federal Supply Class 3130 (Bearings, Mounted) of the Bearings group. The manufacturer of record is Timken Co Div the Timken Company. Government technical data includes 28 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3130-00-490-5050 |
| Primary Part Number | RSA1 3/8 |
| Item Name | Bearing Unit,ball |
| FSC / FSG | 3130 / 31 — Bearings, Mounted |
| Manufacturer | Timken Co Div the Timken Company |
| Status | ACTIVE |
| Seal Type | LABYRINTH |
| Lubrication Material | GREASE |
| Lubrication Fitting Type | HYDRAULIC |
| Assembly Overall Length | 2.250 INCHES NOMINAL IN |
| Housing Height | 4.500 INCHES NOMINAL IN |
| Mounting Slot Length | 1.250 INCHES NOMINAL IN |
| Internal Fit-Up Designation | STANDARD |
| Mounting Hole Type | SLOTTED |
| Rotating Element Locking Method | DIRECT |
| Seal Location | BOTH ENDS |
| Block Type | FIXED |
| Style Designator | PILLOW BLOCK, SOLID |
| Features Provided | GROUND ROLLING ELEMENT GROOVE |
| Center to Center Distance Between Mounting Holes Along Width | 6.250 INCHES NOMINAL IN |
| Housing Width | 8.250 INCHES NOMINAL IN |
| Base Length | 2.250 INCHES NOMINAL IN |
| Alignment Type | SELF-ALIGNING |
| Rolling Element Groove Quantity | 1 |
| Shaft End Type | OPEN |
| Base Thickness | 0.750 INCHES NOMINAL IN |
| Bore Diameter | 1.375 INCHES NOMINAL IN |
| Material | STEEL AND WOOL SEAL |
| Material | IRON CAST HOUSING |
| Housing Length | 1.687 INCHES NOMINAL IN |
| Height From Bottom of Base to Bore Centerline | 2.375 INCHES NOMINAL IN |
| Lubrication Fitting Angle From Horizontal Centerline | 90.0 DEGREES NOMINAL |
| Load Capability Type | RADIAL |
| Mounting Slot Width | 0.750 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| RSA1 3/8 PRIMARY | Timken Co Div the Timken Company (USA) |
| PH3U222H | Rexnord Industries, Llc Div Link-Belt Bearing Operation (USA) |
| Reference | Meaning |
|---|---|
| SP22 | 5/9 Secondary reference Stephens-Adamson Inc a Sub of Allis-Chalmers Corp |
| SP22 | 5/9 Secondary reference Morse Industrial Corp Sealmaster Bearing Div Sub of Emerson Electric Co |
NSN 3130-00-490-5050 is a Bearing Unit,ball, manufactured by Timken Co Div the Timken Company, classified under FSC 3130, Bearings, Mounted. Status: active.
NSN 3130-00-490-5050 has 2 manufacturer part numbers on file: RSA1 3/8 (Timken Co Div the Timken Company), PH3U222H (Rexnord Industries, Llc Div Link-Belt Bearing Operation).
1 possible match (shared part number, not a government interchangeability claim): 6210-01-169-4659. Verify interchangeability with system specifications before substitution.
Key specifications for RSA1 3/8: Seal Type: LABYRINTH; Lubrication Material: GREASE; Lubrication Fitting Type: HYDRAULIC; Assembly Overall Length: 2.250 INCHES NOMINAL IN. 28 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.