The Cam Follower,needle Bearing, cataloged under National Stock Number 3110-01-178-3738, is classified within Federal Supply Class 3110 (Bearings, Antifriction, Unmounted) of the Bearings group. The manufacturer of record is Timken Aerospace, Inc Dba Torrington Product. 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3110-01-178-3738 |
| Primary Part Number | HRS1CTKR7 |
| Item Name | Cam Follower,needle Bearing |
| FSC / FSG | 3110 / 31 — Bearings, Antifriction, Unmounted |
| Manufacturer | Timken Aerospace, Inc Dba Torrington Product |
| Status | ACTIVE |
| Bearing Seal Type | CONTACT |
| Lubrication Material | GREASE |
| Outer Ring Width | 0.2810 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-C-320,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OUTER RING |
| Surface Treatment Document and Classification | QQ-P-416,TY 1,CL 2 FED SPEC SINGLE TREATMENT RESPONSE STUD |
| Surface Treatment Document and Classification | QQ-P-416,TY 1,CL 2 FED SPEC SINGLE TREATMENT RESPONSE END PLATE |
| Thread Length | 0.3440 INCHES NOMINAL IN |
| Style Designator | CAM FOLLOWER |
| Material Document and Classification | 66 FED STD 1ST MATERIAL RESPONSE OR MIL-S-7420 MIL SPEC 2ND MATERIAL RESPONSE OR AMS 6440 ASSN STD 2ND MATERIAL RESPONSE ROLLER |
| Material Document and Classification | AMS 3652 ASSN STD 1ST MATERIAL RESPONSE OR L-P-392 FED SPEC 2ND MATERIAL RESPONSE SEAL |
| Material Document and Classification | ASTM A304 ASSN STD ALL MATERIAL RESPONSES OR ASTM A322 ASSN STD ALL MATERIAL RESPONSES AND ASTM A331 ASSN STD ALL MATERIAL RESPONSES STUD |
| Material Document and Classification | MIL-S-7420 MIL SPEC SINGLE MATERIAL RESPONSE OR AMS 6440 ASSN STD SINGLE MATERIAL RESPONSE END PLATE |
| Material Document and Classification | MIL-S-7420 MIL SPEC SINGLE MATERIAL RESPONSE OR AMS 6440 ASSN STD SINGLE MATERIAL RESPONSE OUTER RING |
| Overall Outside Diameter | 0.5000 INCHES NOMINAL IN |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.190 INCHES IN |
| Stud Length | 0.7815 INCHES NOMINAL IN |
| Surface Treatment | CHROMIUM OUTER RING |
| Surface Treatment | CADMIUM STUD |
| Surface Treatment | CADMIUM END PLATE |
| Seal Quantity | 2 |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | STEEL COMP E52100 OUTER RING |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE OR PLASTIC ACETAL OR PLASTIC POLYAMIDE NYLON OR PLASTIC POLYTETRAFLUOROETHYLENE AND GLASS FIBER SEAL |
| Material | STEEL COMP 4620 OR STEEL COMP 8620 OR STEEL COMP 8620H OR STEEL COMP 8720 STUD |
| Material | STEEL COMP E50100 OR STEEL COMP E52100 ROLLER |
| Material | STEEL COMP E52100 END PLATE |
| 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 |
|---|---|
| HRS1CTKR7 PRIMARY | Timken Aerospace, Inc Dba Torrington Product (USA) |
| HRS1CTKR7 PRIMARY | Accurate Bushing Company, Inc. (USA) |
| Reference | Meaning |
|---|---|
| BACB10AF3F7H | 5/9 Secondary reference U.S. Government activity |
| NAS562-3R7A | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| HRS1CTKR7 | 3/2 Design control — primary reference U.S. Government activity |
| BACB10AF3F7HS | 1/2 Source control — Government-approved source U.S. Government activity |
NSN 3110-01-178-3738 is a Cam Follower,needle Bearing, manufactured by Timken Aerospace, Inc Dba Torrington Product, classified under FSC 3110, Bearings, Antifriction, Unmounted. Status: active.
NSN 3110-01-178-3738 has 2 manufacturer part numbers on file: HRS1CTKR7 (Timken Aerospace, Inc Dba Torrington Product), HRS1CTKR7 (Accurate Bushing Company, Inc.).
Key specifications for HRS1CTKR7: Bearing Seal Type: CONTACT; Lubrication Material: GREASE; Outer Ring Width: 0.2810 INCHES NOMINAL IN; Surface Treatment Document and Classification: QQ-C-320,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OUTER RING. 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.