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431B501 PIECE 2 — BOLT,INTERNAL WRENCHING

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

431B501 PIECE 2: BOLT,INTERNAL WRENCHING.

The BOLT,INTERNAL WRENCHING is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_height: 0.616 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN, thread_class: 2A A, head_diameter: 0.988 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN, thread_length: 1.000 INCHES NOMINAL IN, fastener_length: 1.500 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-169-0688, 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
431B501 PIECE 2
NSN: 5306-01-169-0688
FSC: 5306 — Bolts
CAGE: 01289 — GENERAL ELECTRIC COMPANY (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_height0.616 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
thread_class2A A
head_diameter0.988 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN
thread_length1.000 INCHES NOMINAL IN
fastener_length1.500 INCHES NOMINAL IN
thread_directionRIGHT-HAND
surface_treatmentCOPPER THREADS
width_across_flats0.562 INCHES MINIMUM AND 0.565 INCHES MAXIMUM IN
internal_drive_styleHEXAGON
nominal_thread_diameter0.625 INCHES IN
first_diameter_from_head0.490 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
NSN5306-01-169-0688
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 431B501 PIECE 2 · 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
•
WIDTH ACROSS FLATS: 0.562 INCHES MINIMUM AND 0.565 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.616 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
•
FASTENER LENGTH: 1.500 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: F70A2E,FSCM 01289 MFR REF SINGLE TREATMENT RESPONSE BEARING SURFACE OF HEAD
•
THREAD LENGTH: 1.000 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A193 GR B16 ASSN STD SINGLE MATERIAL RESPONSE OR MIL-S-1222 GR B16 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
FIRST DIAMETER FROM HEAD: 0.490 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.562 INCHES MINIMUM AND 0.565 INCHES MAXIMUM IN
HEAD HEIGHT0.616 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
FASTENER LENGTH1.500 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONF70A2E,FSCM 01289 MFR REF SINGLE TREATMENT RESPONSE BEARING SURFACE OF HEAD
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONF70A2E,FSCM 01289 MFR REF SINGLE TREATMENT RESPONSE THREADS
THREAD LENGTH1.000 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A193 GR B16 ASSN STD SINGLE MATERIAL RESPONSE OR MIL-S-1222 GR B16 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
FIRST DIAMETER FROM HEAD0.490 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.625 INCHES IN
THREAD DIRECTIONRIGHT-HAND
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
PL-7378E65 PIECE 143Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 431B501 PIECE 2?
431B501 PIECE 2 is a BOLT,INTERNAL WRENCHING.
What parts can replace 431B501 PIECE 2?
There is 1 known substitute for 431B501 PIECE 2: PL-7378E65 PIECE 143. Substitute compatibility should be verified for your specific system.
What is the NSN for 431B501 PIECE 2?
431B501 PIECE 2 is cataloged in the U.S. Government catalog under NSN 5306-01-169-0688. 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.