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4312531 — BOLT,INTERNAL WRENCHING

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

4312531: BOLT,INTERNAL WRENCHING.

The BOLT,INTERNAL WRENCHING is a the manufacturer industrial component. Key specifications include head_height: 0.160 INCHES MINIMUM AND 0.164 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 0.265 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN, thread_length: 0.812 INCHES MINIMUM IN, fastener_length: 0.875 INCHES NOMINAL IN, hardness_rating: 38.0 ROCKWELL C MINIMUM AND 42.0 ROCKWELL C MAXIMUM OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-121-2347, 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
4312531
NSN: 5306-00-121-2347
NIINs: 001212347, 014848432
FSC: 5306 — Bolts
CAGE: 81982 — HYDRO-AIRE AEROSPACE CORP (USA)
SPECIFICATIONS
head_height0.160 INCHES MINIMUM AND 0.164 INCHES MAXIMUM IN
thread_class3A A
head_diameter0.265 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN
thread_length0.812 INCHES MINIMUM IN
fastener_length0.875 INCHES NOMINAL IN
hardness_rating38.0 ROCKWELL C MINIMUM AND 42.0 ROCKWELL C MAXIMUM OVERALL
surface_treatmentCADMIUM OVERALL
width_across_flats0.125 INCHES MINIMUM AND 0.127 INCHES MAXIMUM IN
internal_drive_styleHEXAGON
nominal_thread_diameter0.164 INCHES IN
minimum_tensile_strength170000 POUNDS PER SQUARE INCH LBS
thread_quantity_per_inch32
NSN5306-00-121-2347
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 4312531 · 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: 0.125 INCHES MINIMUM AND 0.127 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.160 INCHES MINIMUM AND 0.164 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.875 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 1,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 0.812 INCHES MINIMUM IN
•
HARDNESS RATING: 38.0 ROCKWELL C MINIMUM AND 42.0 ROCKWELL C MAXIMUM OVERALL
•
NOMINAL THREAD DIAMETER: 0.164 INCHES IN
•
SURFACE TREATMENT: CADMIUM OVERALL
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.125 INCHES MINIMUM AND 0.127 INCHES MAXIMUM IN
HEAD HEIGHT0.160 INCHES MINIMUM AND 0.164 INCHES MAXIMUM IN
FASTENER LENGTH0.875 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 1,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH0.812 INCHES MINIMUM IN
HARDNESS RATING38.0 ROCKWELL C MINIMUM AND 42.0 ROCKWELL C MAXIMUM OVERALL
NOMINAL THREAD DIAMETER0.164 INCHES IN
SURFACE TREATMENTCADMIUM OVERALL
MINIMUM TENSILE STRENGTH170000 POUNDS PER SQUARE INCH LBS
INTERNAL DRIVE STYLEHEXAGON
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 4312531?
4312531 is a BOLT,INTERNAL WRENCHING.
What is the NSN for 4312531?
4312531 is cataloged in the U.S. Government catalog under NSN 5306-00-121-2347. 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.