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122-52581-1 — BOLT,EXTERNALLY RELIEVED BODY

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

122-52581-1: BOLT,EXTERNALLY RELIEVED BODY.

The BOLT,EXTERNALLY RELIEVED BODY is a the manufacturer industrial component. Key specifications include material: STEEL COMP 416 OVERALL, head_style: HEXAGON, head_height: 0.885 INCHES MINIMUM AND 0.895 INCHES MAXIMUM IN, thread_length: 0.375 INCHES NOMINAL IN, fastener_length: 0.355 INCHES MINIMUM AND 0.365 INCHES MAXIMUM IN, hardness_rating: 40.0 ROCKWELL C NOMINAL OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-227-6562, 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
122-52581-1
NSN: 5306-01-227-6562
FSC: 5306 — Bolts
CAGE: 04614 — TEXTRON SYSTEMS CORPORATION DBA TEXTRON SYSTEMS CORP (USA)
SPECIFICATIONS
materialSTEEL COMP 416 OVERALL
head_styleHEXAGON
head_height0.885 INCHES MINIMUM AND 0.895 INCHES MAXIMUM IN
thread_length0.375 INCHES NOMINAL IN
fastener_length0.355 INCHES MINIMUM AND 0.365 INCHES MAXIMUM IN
hardness_rating40.0 ROCKWELL C NOMINAL OVERALL
thread_directionRIGHT-HAND
width_between_flats0.500 INCHES NOMINAL IN
first_diameter_from_head0.305 INCHES MINIMUM AND 0.315 INCHES MAXIMUM IN
thread_series_designatorUNF
externally_relieved_body_diameter_quantity1
distance_from_largest_bearing_surface_of_head_to_end_of_first_diameter0.100 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN
NSN5306-01-227-6562
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 122-52581-1 · 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: 0.885 INCHES MINIMUM AND 0.895 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.355 INCHES MINIMUM AND 0.365 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.375 INCHES NOMINAL IN
•
HARDNESS RATING: 40.0 ROCKWELL C NOMINAL OVERALL
•
FIRST DIAMETER FROM HEAD: 0.305 INCHES MINIMUM AND 0.315 INCHES MAXIMUM IN
•
HEAD STYLE: HEXAGON
•
THREAD DIRECTION: RIGHT-HAND
•
WIDTH BETWEEN FLATS: 0.500 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.885 INCHES MINIMUM AND 0.895 INCHES MAXIMUM IN
FASTENER LENGTH0.355 INCHES MINIMUM AND 0.365 INCHES MAXIMUM IN
THREAD LENGTH0.375 INCHES NOMINAL IN
HARDNESS RATING40.0 ROCKWELL C NOMINAL OVERALL
FIRST DIAMETER FROM HEAD0.305 INCHES MINIMUM AND 0.315 INCHES MAXIMUM IN
HEAD STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
WIDTH BETWEEN FLATS0.500 INCHES NOMINAL IN
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF FIRST DIAMETER0.100 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN
EXTERNALLY RELIEVED BODY DIAMETER QUANTITY1
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

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 122-52581-1?
122-52581-1 is a BOLT,EXTERNALLY RELIEVED BODY.
What is the NSN for 122-52581-1?
122-52581-1 is cataloged in the U.S. Government catalog under NSN 5306-01-227-6562. 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.