The Bearing,ball,annular, cataloged under National Stock Number 3110-00-231-7728, is classified within Federal Supply Class 3110 (Bearings, Antifriction, Unmounted) of the Bearings group. The manufacturer of record is Nsk Corp Bearing Div. Government technical data includes 22 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3110-00-231-7728 |
| Primary Part Number | 6304DDUC3E1AK2 |
| Item Name | Bearing,ball,annular |
| FSC / FSG | 3110 / 31 — Bearings, Antifriction, Unmounted |
| Manufacturer | Nsk Corp Bearing Div |
| Status | ACTIVE |
| Retainer Fabrication Method | PRESSED |
| Bearing Seal Type | CONTACT |
| Lubrication Material | GREASE |
| Internal Fit-Up Designation | LOOSE |
| Surface Finish | GROUND |
| Style Designator | NON-LOADING GROOVE, NON-SEPARABLE |
| Material Document and Classification | 66 FED STD SINGLE MATERIAL RESPONSE BALL |
| Material Document and Classification | 66 FED STD SINGLE MATERIAL RESPONSE RETAINER |
| Material Document and Classification | 66 FED STD SINGLE MATERIAL RESPONSE OUTER RING |
| Material Document and Classification | 66 FED STD SINGLE MATERIAL RESPONSE INNER RING |
| Overall Outside Diameter | 52.00 MILLIMETERS NOMINAL MM |
| Bore Shape | STRAIGHT |
| Load Direction | RADIAL |
| Seal Quantity | 2 |
| Standard Tolerance Designation | ABEC NO.1 |
| Bore Diameter | 20.00 MILLIMETERS NOMINAL MM |
| Material | STEEL COMP E52100 BALL |
| Material | RUBBER SYNTHETIC SEAL |
| Material | STEEL COMP E52100 RETAINER |
| Material | STEEL COMP E52100 OUTER RING |
| Material | STEEL COMP E52100 INNER RING |
| Lubrication Material Document and Classification | ANDOK 260,FSCM 29700 MFR REF SINGLE MATERIAL RESPONSE |
| 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 |
|---|---|
| P304NPPFS167E | Timken Co Div the Timken Company (USA) |
| 18D | Grundfos Cbs, Inc Dba Paco Pumps (USA) |
| 6304DDUC3E1AK2 PRIMARY | Nsk Corp Bearing Div (USA) |
NSN 3110-00-231-7728 is a Bearing,ball,annular, manufactured by Nsk Corp Bearing Div, classified under FSC 3110, Bearings, Antifriction, Unmounted. Status: active.
NSN 3110-00-231-7728 has 3 manufacturer part numbers on file: P304NPPFS167E (Timken Co Div the Timken Company), 18D (Grundfos Cbs, Inc Dba Paco Pumps), 6304DDUC3E1AK2 (Nsk Corp Bearing Div).
2 possible matches (shared part number, not a government interchangeability claim): 6680-00-542-1590, 4020-01-373-4111. Verify interchangeability with system specifications before substitution.
Key specifications for 6304DDUC3E1AK2: Retainer Fabrication Method: PRESSED; Bearing Seal Type: CONTACT; Lubrication Material: GREASE; Internal Fit-Up Designation: LOOSE. 22 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.