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684S3 — BOLT,U

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

684S3: BOLT,U.

The BOLT,U is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4140 OR STEEL OVERALL, thread_class: 3A A, thread_length: 2.125 INCHES MINIMUM IN, hardness_rating: 269.0 BRINELL STANDARD MINIMUM AND 302.0 BRINELL STANDARD MAXIMUM OVERALL, style_designator: SQUARE BEND, thread_direction: RIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-207-4931, 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
684S3
NSN: 5306-00-207-4931
FSC: 5306 — Bolts
CAGE: 56442 — DIAMOND REO TRUCK CO (USA)
SPECIFICATIONS
materialSTEEL COMP 4140 OR STEEL OVERALL
thread_class3A A
thread_length2.125 INCHES MINIMUM IN
hardness_rating269.0 BRINELL STANDARD MINIMUM AND 302.0 BRINELL STANDARD MAXIMUM OVERALL
style_designatorSQUARE BEND
thread_directionRIGHT-HAND
surface_treatmentPRIMER OVERALL
nominal_thread_diameter0.750 INCHES IN
thread_quantity_per_inch16
thread_series_designatorUNF
inside_distance_between_shanks2.562 INCHES NOMINAL IN
material_document_and_classificationSAE 4140 ASSN STD 1ST MATERIAL RESPONSE OR 41885,TS8645 OR TS8647 OR TS4140 OR TS4142 OR TS4145 MFR REF 2ND MATERIAL RESPONSE OVERALL
NSN5306-00-207-4931
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 684S3 · 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
•
INSIDE DISTANCE BETWEEN SHANKS: 2.562 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: TT-P-636 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 2.125 INCHES MINIMUM IN
•
HARDNESS RATING: 269.0 BRINELL STANDARD MINIMUM AND 302.0 BRINELL STANDARD MAXIMUM OVERALL
•
DISTANCE FROM INSIDE CENTER OF BEND TO BOLT END: 12.000 INCHES NOMINAL IN
•
STYLE DESIGNATOR: SQUARE BEND
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE 4140 ASSN STD 1ST MATERIAL RESPONSE OR 41885,TS8645 OR TS8647 OR TS4140 OR TS4142 OR TS4145 MFR REF 2ND MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.750 INCHES IN
TECHNICAL CHARACTERISTICS
INSIDE DISTANCE BETWEEN SHANKS2.562 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONTT-P-636 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH2.125 INCHES MINIMUM IN
HARDNESS RATING269.0 BRINELL STANDARD MINIMUM AND 302.0 BRINELL STANDARD MAXIMUM OVERALL
DISTANCE FROM INSIDE CENTER OF BEND TO BOLT END12.000 INCHES NOMINAL IN
STYLE DESIGNATORSQUARE BEND
MATERIAL DOCUMENT AND CLASSIFICATIONSAE 4140 ASSN STD 1ST MATERIAL RESPONSE OR 41885,TS8645 OR TS8647 OR TS4140 OR TS4142 OR TS4145 MFR REF 2ND MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.750 INCHES IN
THREAD DIRECTIONRIGHT-HAND
SURFACE TREATMENTPRIMER OVERALL
OTHER ITEMS IN FSC 5306 — Bolts
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5306-00-004-7044 5306-00-007-6129 5306-00-008-7899 5306-00-009-4739 5306-00-118-7332 5306-00-151-1777 5306-00-255-4507 5306-01-101-2459
SUBSTITUTES & CROSS-REFERENCES 1
915978Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 684S3?
684S3 is a BOLT,U.
What parts can replace 684S3?
There is 1 known substitute for 684S3: 915978. Substitute compatibility should be verified for your specific system.
What is the NSN for 684S3?
684S3 is cataloged in the U.S. Government catalog under NSN 5306-00-207-4931. 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.