The Bolt,close Tolerance, cataloged under National Stock Number 5306-00-541-9490, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Hi-Shear Corporation. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 14 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-541-9490 |
| Primary Part Number | MB61-6D19 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Head Height | 0.200 INCHES MINIMUM AND 0.220 INCHES MAXIMUM IN |
| Fastener Length | 1.688 INCHES MINIMUM AND 1.735 INCHES MAXIMUM IN |
| Thread Length | 0.490 INCHES MINIMUM AND 0.557 INCHES MAXIMUM IN |
| Shank Unthreaded Hole Diameter | 0.106 INCHES MINIMUM AND 0.111 INCHES MAXIMUM FIRST HOLE IN |
| Material Document and Classification | AMS 6487 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | DOUBLE HEXAGON |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 08524-B-17019 MANUFACTURERS STANDARD |
| Grip Length | 1.178 INCHES MINIMUM AND 1.198 INCHES MAXIMUM IN |
| Width Between Flats | 0.553 INCHES MINIMUM AND 0.564 INCHES MAXIMUM IN |
| Grip Diameter | 0.3740 INCHES MINIMUM AND 0.3745 INCHES MAXIMUM IN |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP H11 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 1.563 INCHES MINIMUM AND 1.620 INCHES MAXIMUM 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 |
|---|---|
| MB61-6D19 | Hi-Shear Corporation (USA) |
| PBF1253-6D19 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| AIC753-6D19 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| BM17019-6D19 | Huck International, Inc (USA) |
| ST3M453-6D19 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| HP5453-6D19 | Heartland Precision Fasteners Inc (USA) |
| 11825-6D19 | Reid Products Inc. Dba Reid Products Inc (USA) |
| VS3204-6D19 | Howmet Global Fastening Systems Inc (USA) |
| S11-1060-6D19 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| ST3M453-6D19 | M.s. Aerospace Inc. Dba Ms Aerospace Inc (USA) |
| FIT7047-6D19 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| VAL23029-6D19 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| MB61-6D19 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| GS1016-6D19 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| Reference | Meaning |
|---|---|
| BM17019-6D19 | 5/9 Secondary reference U.S. Government activity |
| 109453-6D19 | C/1 Advisory reference — outside the item-of-supply concept Sps Technologies, Llc Dba PB Fasteners |
| ST3M453-6D19 | 5/9 Secondary reference Kenaloy Products Inc Sub Masco Corp |
| ST3M453-6D19 | 5/9 Secondary reference U.S. Government activity |
| KS3020-6D19 | C/1 Advisory reference — outside the item-of-supply concept Kenaloy Products Inc Sub Masco Corp |
| ST3M453-6D19 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| 109453-6D19 | 3/2 Design control — primary reference U.S. Government activity |
| ST3M453-6D19 | 5/9 Secondary reference Abounding Security Inc Div of Maa Corp |
NSN 5306-00-541-9490 is a Bolt,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-541-9490 has 14 manufacturer part numbers on file: MB61-6D19 (Hi-Shear Corporation), PBF1253-6D19 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), AIC753-6D19 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), BM17019-6D19 (Huck International, Inc), ST3M453-6D19 (Sps Technologies, Llc Dba PB Fasteners) and 9 more.
Key specifications for MB61-6D19: Head Height: 0.200 INCHES MINIMUM AND 0.220 INCHES MAXIMUM IN; Fastener Length: 1.688 INCHES MINIMUM AND 1.735 INCHES MAXIMUM IN; Thread Length: 0.490 INCHES MINIMUM AND 0.557 INCHES MAXIMUM IN; Shank Unthreaded Hole Diameter: 0.106 INCHES MINIMUM AND 0.111 INCHES MAXIMUM FIRST HOLE IN. 17 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.