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71657H-7-2455 — BOLT,EXTERNALLY RELIEVED BODY

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

71657H-7-2455: BOLT,EXTERNALLY RELIEVED BODY.

The BOLT,EXTERNALLY RELIEVED BODY is a the manufacturer industrial component. Key specifications include material: STEEL COMP H11 OVERALL, head_style: HEXAGON, head_height: 0.183 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN, thread_class: 3A A, thread_length: 0.324 INCHES MINIMUM AND 0.344 INCHES MAXIMUM IN, fastener_length: 2.893 INCHES MINIMUM AND 2.903 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-337-2300, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
71657H-7-2455
NSN: 5306-01-337-2300
FSC: 5306 — Bolts
CAGE: 56878 — SPS TECHNOLOGIES, LLC DBA PB FASTENERS (USA)
SPECIFICATIONS
materialSTEEL COMP H11 OVERALL
head_styleHEXAGON
head_height0.183 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN
thread_class3A A
thread_length0.324 INCHES MINIMUM AND 0.344 INCHES MAXIMUM IN
fastener_length2.893 INCHES MINIMUM AND 2.903 INCHES MAXIMUM IN
hardness_rating46.0 ROCKWELL C MINIMUM AND 55.0 ROCKWELL C MAXIMUM OVERALL
special_featuresDRY FILM LUBE PER MIL-L-46010 GRIP ONLY
thread_directionRIGHT-HAND
surface_treatmentCADMIUM THREADS
width_between_flats0.558 INCHES NOMINAL IN
end_item_identificationPACER DAWN
NSN5306-01-337-2300
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 71657H-7-2455 · OEM ⚠ VERIFY BEFORE ORDERING Verify thread pitch before ordering — metric (M8×1.25) ≠ imperial (5/16-18). Wrong thread = wrong part. Grade/class stamped on bolt head determines tensile strength ✓ BROKER TIP Grade/class stamped on head determines tensile strength. Grade 8 > Grade 5 > Grade 2. Always confirm head marking matches specification requirement PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
HEAD HEIGHT: 0.183 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN
•
FASTENER LENGTH: 2.893 INCHES MINIMUM AND 2.903 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: NAS 672 NATIONAL SPEC SINGLE TREATMENT RESPONSE HEAD
•
THREAD LENGTH: 0.324 INCHES MINIMUM AND 0.344 INCHES MAXIMUM IN
•
HARDNESS RATING: 46.0 ROCKWELL C MINIMUM AND 55.0 ROCKWELL C MAXIMUM OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 6487 (H-11) ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
FIRST DIAMETER FROM HEAD: 0.437 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.183 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN
FASTENER LENGTH2.893 INCHES MINIMUM AND 2.903 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONNAS 672 NATIONAL SPEC SINGLE TREATMENT RESPONSE HEAD
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONNAS 672 NATIONAL SPEC SINGLE TREATMENT RESPONSE THREADS
THREAD LENGTH0.324 INCHES MINIMUM AND 0.344 INCHES MAXIMUM IN
HARDNESS RATING46.0 ROCKWELL C MINIMUM AND 55.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 6487 (H-11) ASSN STD SINGLE MATERIAL RESPONSE OVERALL
FIRST DIAMETER FROM HEAD0.437 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.375 INCHES IN
HEAD STYLEHEXAGON
OTHER ITEMS IN FSC 5306 — Bolts
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5306-00-001-1276 5306-00-001-1949 5306-00-001-1988 5306-00-001-1989 5306-00-001-1990 5306-00-001-1991 5306-00-001-1993 5306-00-001-2017
SUBSTITUTES & CROSS-REFERENCES 1
5306-001-7D2455Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 71657H-7-2455?
71657H-7-2455 is a BOLT,EXTERNALLY RELIEVED BODY.
What parts can replace 71657H-7-2455?
There is 1 known substitute for 71657H-7-2455: 5306-001-7D2455. Substitute compatibility should be verified for your specific system.
What is the NSN for 71657H-7-2455?
71657H-7-2455 is cataloged in the U.S. Government catalog under NSN 5306-01-337-2300. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.