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16W551-7 — STUD,SHOULDERED AND STEPPED

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

16W551-7: STUD,SHOULDERED AND STEPPED.

The STUD,SHOULDERED AND STEPPED is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING, thread_class: 3A STUD THREAD A, thread_length: 0.458 INCHES MINIMUM AND 0.478 INCHES MAXIMUM STUD THREAD IN, overall_length: 1.655 INCHES MINIMUM AND 1.675 INCHES MAXIMUM IN, surface_finish: 63.0 MICROINCHES OVERALL, shoulder_length: 0.005 INCHES MINIMUM AND 0.025 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5307-01-043-9993, 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
16W551-7
NSN: 5307-01-043-9993
FSC: 5307 — Studs
CAGE: 81755 — LOCKHEED MARTIN CORPORATION DIV LOCKHEED MARTIN AERONAUTICS COMPANY (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING
thread_class3A STUD THREAD A
thread_length0.458 INCHES MINIMUM AND 0.478 INCHES MAXIMUM STUD THREAD IN
overall_length1.655 INCHES MINIMUM AND 1.675 INCHES MAXIMUM IN
surface_finish63.0 MICROINCHES OVERALL
shoulder_length0.005 INCHES MINIMUM AND 0.025 INCHES MAXIMUM IN
style_designatorSHOULDERED AND STEPPED
thread_directionRIGHT-HAND NUT THREAD
shoulder_diameter0.563 INCHES MINIMUM AND 0.583 INCHES MAXIMUM IN
nominal_thread_size0.3125 INCHES STUD THREAD IN
nut_end_shank_length0.277 INCHES MINIMUM AND 0.297 INCHES MAXIMUM IN
nut_end_shank_diameter0.249 INCHES NOMINAL IN
NSN5307-01-043-9993
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 16W551-7 · 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
•
SURFACE FINISH: 63.0 MICROINCHES OVERALL
•
COTTER PIN HOLE DIAMETER: 0.076 INCHES MINIMUM AND 0.086 INCHES MINIMUM FIRST HOLE IN
•
NUT END SHANK DIAMETER: 0.249 INCHES NOMINAL IN
•
THREAD LENGTH: 0.380 INCHES MINIMUM AND 0.400 INCHES MAXIMUM NUT THREAD IN
•
STYLE DESIGNATOR: SHOULDERED AND STEPPED
•
THREAD DIRECTION: RIGHT-HAND STUD THREAD
TECHNICAL CHARACTERISTICS
SURFACE FINISH63.0 MICROINCHES OVERALL
COTTER PIN HOLE DIAMETER0.076 INCHES MINIMUM AND 0.086 INCHES MINIMUM FIRST HOLE IN
NUT END SHANK DIAMETER0.249 INCHES NOMINAL IN
THREAD LENGTH0.380 INCHES MINIMUM AND 0.400 INCHES MAXIMUM NUT THREAD IN
THREAD LENGTH0.458 INCHES MINIMUM AND 0.478 INCHES MAXIMUM STUD THREAD IN
STYLE DESIGNATORSHOULDERED AND STEPPED
OVERALL LENGTH1.655 INCHES MINIMUM AND 1.675 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND STUD THREAD
THREAD DIRECTIONRIGHT-HAND NUT THREAD
NOMINAL THREAD SIZE0.3125 INCHES STUD THREAD IN
OTHER ITEMS IN FSC 5307 — Studs
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5307-00-000-6436 5307-00-001-1578 5307-00-001-1761 5307-00-001-2366 5307-00-001-4491 5307-00-001-4624 5307-00-001-4625
SUBSTITUTES & CROSS-REFERENCES 1
5307PL0646462Reference document
Same NSN cross-reference
Reference document — Informative reference only
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 16W551-7?
16W551-7 is a STUD,SHOULDERED AND STEPPED.
What parts can replace 16W551-7?
There is 1 known substitute for 16W551-7: 5307PL0646462. Substitute compatibility should be verified for your specific system.
What is the NSN for 16W551-7?
16W551-7 is cataloged in the U.S. Government catalog under NSN 5307-01-043-9993. 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.