The Bolt,close Tolerance, cataloged under National Stock Number 5306-00-003-6555, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Northrop Grumman Aeronautics Systems. Government technical data includes 22 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-003-6555 |
| Primary Part Number | A51H10634-11 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Northrop Grumman Aeronautics Systems |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES GRIP |
| Surface Finish | 63.0 MICROINCHES BEARING SURFACE OF HEAD |
| Surface Finish | 16.0 MICROINCHES THREADS |
| Surface Finish | 16.0 MICROINCHES SIDES OF HEAD |
| Extended Washer Thickness | 0.140 INCHES MINIMUM AND 0.140 INCHES MINIMUM AND 0.160 INCHES MAXIMUM0.160 INCHES MAXIMUM IN |
| Head Height | 0.608 INCHES MINIMUM AND 0.608 INCHES MINIMUM AND 0.628 INCHES MAXIMUM0.628 INCHES MAXIMUM IN |
| Fastener Length | 2.233 INCHES MINIMUM AND 2.233 INCHES MINIMUM AND 2.263 INCHES MAXIMUM2.263 INCHES MAXIMUM IN |
| Extended Washer Diameter | 1.040 INCHES MINIMUM AND 1.040 INCHES MINIMUM AND 1.050 INCHES MAXIMUM1.050 INCHES MAXIMUM IN |
| Thread Length | 0.848 INCHES MINIMUM AND 0.848 INCHES MINIMUM AND 0.898 INCHES MAXIMUM0.898 INCHES MAXIMUM IN |
| Shank Unthreaded Hole Diameter | 0.141 INCHES MINIMUM AND 0.151 INCHES MAXIMUM FIRST HOLE IN |
| Material Document and Classification | NAS621 COMP 6AL-4V ASSN STD SINGLE MATERIAL RESPONSE OVERALL V |
| Nominal Thread Diameter | 0.625 INCHES IN |
| Head Style | DOUBLE HEXAGON W/HOLEDOUBLE HEXAGON W/HOLE |
| Thread Direction | RIGHT-HANDRIGHT-HAND |
| Grip Length | 1.365 INCHES MINIMUM AND 1.385 INCHES MAXIMUM IN |
| Width Between Flats | 0.682 INCHES MINIMUM AND 0.682 INCHES MINIMUM AND 0.691 INCHES MAXIMUM0.691 INCHES MAXIMUM IN |
| Grip Diameter | 0.6230 INCHES MINIMUM AND 0.6230 INCHES MINIMUM AND 0.6240 INCHES MAXIMUM0.6240 INCHES MAXIMUM IN |
| Thread Class | 3A3A |
| Thread Quantity Per Inch | 18 |
| Material | TITANIUM ALLOY OVERALL |
| Thread Series Designator | UNF |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 1.750 INCHES NOMINAL FIRST HOLE 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 |
|---|---|
| A51H10634-11 | Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Northrop Grumman Aeronautics Systems (USA) |
| Reference | Meaning |
|---|---|
| A51H10634-11 | C/1 Advisory reference — outside the item-of-supply concept Northrop Grumman Systems Corporation |
| A51H10634-11 | 3/9 Design control — primary reference Northrop Grumman Systems Corporation |
NSN 5306-00-003-6555 is a Bolt,close Tolerance, manufactured by Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Northrop Grumman Aeronautics Systems, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-003-6555 has 1 manufacturer part number on file: A51H10634-11 (Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Northrop Grumman Aeronautics Systems).
Key specifications for A51H10634-11: Surface Finish: 63.0 MICROINCHES GRIP; Surface Finish: 63.0 MICROINCHES BEARING SURFACE OF HEAD; Surface Finish: 16.0 MICROINCHES THREADS; Surface Finish: 16.0 MICROINCHES SIDES OF HEAD. 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.