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4018048 — BOLT,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

4018048: BOLT,SHOULDER.

The BOLT,SHOULDER is a the manufacturer industrial component. Key specifications include material: IRON ALLOY 660 OVERALL, head_style: SQUARE, head_height: 0.125 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN, thread_class: 3A A, thread_length: 0.233 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN, shoulder_shape: ROUND FIRST SHOULDER. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-425-8437, 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
4018048
NSN: 5306-00-425-8437
FSC: 5306 — Bolts
CAGE: 11449 — TURBO POWER & MARINE SYSTEM INC SUB OF UNITED TECHNOLOGIES CORP (USA)
SPECIFICATIONS
materialIRON ALLOY 660 OVERALL
head_styleSQUARE
head_height0.125 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
thread_class3A A
thread_length0.233 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length2.530 INCHES MINIMUM AND 2.570 INCHES MAXIMUM IN
hardness_rating24.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM OVERALL
shoulder_length2.220 INCHES MINIMUM AND 2.240 INCHES MAXIMUM FIRST SHOULDER IN
thread_directionRIGHT-HAND
shoulder_diameter0.2494 INCHES MINIMUM AND 0.2497 INCHES MAXIMUM FIRST SHOULDER IN
surface_treatmentCHROMIUM OVERALL
NSN5306-00-425-8437
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 4018048 · 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: 0.125 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
•
FASTENER LENGTH: 2.530 INCHES MINIMUM AND 2.570 INCHES MAXIMUM IN
•
SHOULDER LENGTH: 2.220 INCHES MINIMUM AND 2.240 INCHES MAXIMUM FIRST SHOULDER IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: AMS 2406 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
SHOULDER DIAMETER: 0.2494 INCHES MINIMUM AND 0.2497 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD LENGTH: 0.233 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
•
HARDNESS RATING: 24.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM OVERALL
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.125 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
FASTENER LENGTH2.530 INCHES MINIMUM AND 2.570 INCHES MAXIMUM IN
SHOULDER LENGTH2.220 INCHES MINIMUM AND 2.240 INCHES MAXIMUM FIRST SHOULDER IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONAMS 2406 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
SHOULDER DIAMETER0.2494 INCHES MINIMUM AND 0.2497 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH0.233 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
SHOULDER SHAPEROUND FIRST SHOULDER
HARDNESS RATING24.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5731 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.190 INCHES 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 1
4059357Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 4018048?
4018048 is a BOLT,SHOULDER.
What parts can replace 4018048?
There is 1 known substitute for 4018048: 4059357. Substitute compatibility should be verified for your specific system.
What is the NSN for 4018048?
4018048 is cataloged in the U.S. Government catalog under NSN 5306-00-425-8437. 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.