The Bolt,machine, cataloged under National Stock Number 5306-01-475-2169, 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 15 specifications, cited from the U.S. Government catalog. The record lists 11 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 5306-01-475-2169 |
| Primary Part Number | MB88-5-28 |
| Item Name | Bolt,machine |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Head Height | 0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN |
| Fastener Length | 2.201 INCHES MINIMUM AND 2.248 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.487 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.3125 INCHES IN |
| Head Style | DOUBLE HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.740 INCHES MINIMUM AND 1.760 INCHES MAXIMUM IN |
| Width Between Flats | 0.502 INCHES NOMINAL IN |
| Grip Diameter | 0.3271 INCHES MINIMUM AND 0.3276 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| 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 |
|---|---|
| MB88-5-28 PRIMARY | Hi-Shear Corporation (USA) |
| VS3037-5-28 | Howmet Global Fastening Systems Inc (USA) |
| HP497-5-28 PRIMARY | Heartland Precision Fasteners Inc (USA) |
| HP5497-5-28 | Heartland Precision Fasteners Inc (USA) |
| MB88-5-28 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M497-5-28 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| PBF1254-5-28 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M497-5-28 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| BM17019-5-28 PRIMARY | Huck International, Inc (USA) |
| S11-1061-5-28 PRIMARY | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| VAL23607-5-28 PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| Reference | Meaning |
|---|---|
| VS3037-5-28 | 3/2 Design control — primary reference U.S. Government activity |
| ST3M497-5-28 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| ST3M497 | D/9 Drawing number reference only The Boeing Company Div Defense |
| 109450-5-28 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-01-475-2169 is a Bolt,machine, manufactured by Hi-Shear Corporation, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-475-2169 has 11 manufacturer part numbers on file: MB88-5-28 (Hi-Shear Corporation), VS3037-5-28 (Howmet Global Fastening Systems Inc), HP497-5-28 (Heartland Precision Fasteners Inc), HP5497-5-28 (Heartland Precision Fasteners Inc), MB88-5-28 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc) and 6 more.
2 possible matches (shared part number, not a government interchangeability claim): 5306-01-475-2619, 5306-01-475-2628. Verify interchangeability with system specifications before substitution.
Key specifications for MB88-5-28: Head Height: 0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN; Fastener Length: 2.201 INCHES MINIMUM AND 2.248 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.487 INCHES NOMINAL IN. 15 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.