| Item Name | Bolt Close Tolerance |
| Federal Supply Group (FSG) | Hardware and Abrasives |
| Federal Supply Class (FSC) | 5306 Bolts |
| National Item Identification Number (NIIN) | 01-027-1997 (010271997) |
| NCB Code | USA (01) |
| Manufacturer | Valley Todeco Inc, Sps Technologies Inc, Northrop Grumman Systems Corporation, Alcoa Global Fasteners Inc, Huck International Inc |
| Part Number | Manufacturer | Item Name | Cage Code | RFQ |
|---|---|---|---|---|
| GB511BY4M18 | valley todeco inc | bolt close tolerance | 06710 | RFQ |
| 110185-4-19M | sps technologies inc | bolt close tolerance | 56878 | RFQ |
| 110185-4-18M | sps technologies inc | bolt close tolerance | 80539 | RFQ |
| GB511BY4-18M | northrop grumman systems corporation | bolt close tolerance | 26512 | RFQ |
| VEH160271-4M18 | valley todeco inc | bolt close tolerance | 06710 | RFQ |
| VS3117-4-18 | alcoa global fasteners inc | bolt close tolerance | 92215 | RFQ |
| BM15016-4-18A | huck international inc | bolt close tolerance | 97928 | RFQ |
| GB511BY4M18 | alcoa global fasteners inc | bolt close tolerance | 92215 | RFQ |
| GB511BY4M18 | sps technologies inc | bolt close tolerance | 27624 | RFQ |
| MRC | Criteria | Characteristic |
|---|---|---|
| AAJD | THREAD CLASS | 3A |
| AAJF | THREAD DIRECTION | RIGHT-HAND |
| AASA | THREAD LENGTH | 0.425 INCHES NOMINAL |
| AASK | HEAD STYLE | HEXAGON |
| AASU | HEAD HEIGHT | 0.125 INCHES MINIMUM AND 0.140 INCHES MAXIMUM |
| AATB | WIDTH BETWEEN FLATS | 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM |
| AHYM | NOMINAL THREAD DIAMETER | 0.250 INCHES |
| ANEE | GRIP LENGTH | 1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM |
| CMLP | THREAD QUANTITY PER INCH | 28 |
| CSYM | SURFACE FINISH | 16.0 MICROINCHES THREADS |
| CSYM | SURFACE FINISH | 63.0 MICROINCHES BEARING SURFACE OF HEAD |
| CSYM | SURFACE FINISH | 63.0 MICROINCHES GRIP |
| CXCY | PART NAME ASSIGNED BY CONTROLLING AGENCY | NAVY SPECIAL PROJECT |
| MATT | MATERIAL | TITANIUM ALLOY OVERALL |
| MDCL | MATERIAL DOCUMENT AND CLASSIFICATION | NAS621 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| THSD | THREAD SERIES DESIGNATOR | UNJF |
| ZZZK | SPECIFICATION/STANDARD DATA | 26512-GB511BY4 MANUFACTURERS STANDARD |
| Relevant Components for NSN - 5306-01-027-1997, 5306010271997 | ||||
| 5320-01-093-5687 (5320010935687) | 5340-00-286-8500 (5340002868500) | 5310-00-797-4430 (5310007974430) | 5331-01-548-6940 (5331015486940) | |
| 5340-01-389-2408 (5340013892408) | 5340-01-499-3481 (5340014993481) | 5310-01-418-9739 (5310014189739) | 5320-01-419-8697 (5320014198697) | |
| 5340-01-681-6722 (5340016816722) | 5340-01-620-4639 (5340016204639) | 5340-01-481-2087 (5340014812087) | 5331-01-097-0869 (5331010970869) | |
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