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492918 — BOLT,INTERNALLY RELIEVED BODY

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

492918: BOLT,INTERNALLY RELIEVED BODY.

The BOLT,INTERNALLY RELIEVED BODY is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: HEXAGON, head_height: 0.110 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN, thread_class: 3A A, thread_length: 0.560 INCHES MINIMUM AND 0.580 INCHES MAXIMUM IN, fastener_length: 4.510 INCHES MINIMUM AND 4.530 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-939-9702, 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
492918
NSN: 5306-00-939-9702
FSC: 5306 — Bolts
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEXAGON
head_height0.110 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN
thread_class3A A
thread_length0.560 INCHES MINIMUM AND 0.580 INCHES MAXIMUM IN
fastener_length4.510 INCHES MINIMUM AND 4.530 INCHES MAXIMUM IN
hardness_rating35.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL
shoulder_length3.200 INCHES MINIMUM AND 3.240 INCHES MAXIMUM IN
style_designatorCOUNTERBORE UNTHREADED
thread_directionRIGHT-HAND
counterbore_depth1.070 INCHES MINIMUM AND 1.090 INCHES MAXIMUM IN
shoulder_diameter1.290 INCHES MINIMUM AND 1.310 INCHES MAXIMUM IN
NSN5306-00-939-9702
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 492918 · 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: 0.110 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN
•
FASTENER LENGTH: 4.510 INCHES MINIMUM AND 4.530 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: AMS 7470 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
CONCENTRIC HOLE DEPTH: 4.180 INCHES MINIMUM AND 4.220 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.560 INCHES MINIMUM AND 0.580 INCHES MAXIMUM IN
•
HARDNESS RATING: 35.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL
•
STYLE DESIGNATOR: COUNTERBORE UNTHREADED
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5616 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.110 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN
FASTENER LENGTH4.510 INCHES MINIMUM AND 4.530 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONAMS 7470 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
CONCENTRIC HOLE DEPTH4.180 INCHES MINIMUM AND 4.220 INCHES MAXIMUM IN
THREAD LENGTH0.560 INCHES MINIMUM AND 0.580 INCHES MAXIMUM IN
HARDNESS RATING35.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL
STYLE DESIGNATORCOUNTERBORE UNTHREADED
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5616 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.250 INCHES IN
COUNTERBORE DEPTH1.070 INCHES MINIMUM AND 1.090 INCHES MAXIMUM IN
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: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 492918?
492918 is a BOLT,INTERNALLY RELIEVED BODY.
What is the NSN for 492918?
492918 is cataloged in the U.S. Government catalog under NSN 5306-00-939-9702. 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.