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71688-1 — STUD,STEPPED

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

71688-1: STUD,STEPPED.

The STUD,STEPPED is a the manufacturer industrial component. Key specifications include thread_class: 3A STUD THREAD A, thread_direction: RIGHT-HAND STUD THREAD, nominal_thread_size: 0.3750 INCHES STUD THREAD IN, thread_quantity_per_inch: 24 NUT THREAD, thread_series_designator: UNF NUT THREAD. This part is cataloged in the U.S.

Government catalog under NSN 5307-01-198-1811, 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
71688-1
NSN: 5307-01-198-1811
FSC: 5307 — Studs
CAGE: 11599 — TRIUMPH ENGINE CONTROL SYSTEMS LLC (USA)
SPECIFICATIONS
thread_class3A STUD THREAD A
thread_directionRIGHT-HAND STUD THREAD
nominal_thread_size0.3750 INCHES STUD THREAD IN
thread_quantity_per_inch24 NUT THREAD
thread_series_designatorUNF NUT THREAD
NSN5307-01-198-1811
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 71688-1 · 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
•
THREAD DIRECTION: RIGHT-HAND STUD THREAD
•
NOMINAL THREAD SIZE: 0.3125 INCHES NUT THREAD IN
•
THREAD CLASS: 3A NUT THREAD A
•
THREAD QUANTITY PER INCH: 24 NUT THREAD
TECHNICAL CHARACTERISTICS
THREAD DIRECTIONRIGHT-HAND STUD THREAD
THREAD DIRECTIONRIGHT-HAND NUT THREAD
NOMINAL THREAD SIZE0.3125 INCHES NUT THREAD IN
NOMINAL THREAD SIZE0.3750 INCHES STUD THREAD IN
THREAD CLASS3A NUT THREAD A
THREAD CLASS3A STUD THREAD A
THREAD QUANTITY PER INCH24 NUT THREAD
THREAD QUANTITY PER INCH16 STUD THREAD
THREAD SERIES DESIGNATORUNF NUT THREAD
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC) STUD THREAD
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
877B-5SDH-12Reference 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 71688-1?
71688-1 is a STUD,STEPPED.
What parts can replace 71688-1?
There is 1 known substitute for 71688-1: 877B-5SDH-12. Substitute compatibility should be verified for your specific system.
What is the NSN for 71688-1?
71688-1 is cataloged in the U.S. Government catalog under NSN 5307-01-198-1811. 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.