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Technical Data Sheet
PartsTable / COMPONENT / 1/2-13UNC-2A X 3 1/4
1/2-13UNC-2A X 3 1/4 ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The 1/2-13UNC-2A X 3 1/4 is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5307-00-436-1677, 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
1/2-13UNC-2A X 3 1/4
NSN: 5307-00-436-1677
FSC: 5307
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
Part Number1/2-13UNC-2A X 3 1/4
NSN5307-00-436-1677
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 1/2-13UNC-2A X 3 1/4 · 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
•
NOMINAL THREAD SIZE: 0.500 INCHES LOCATION NOT OTHERWISE SPECIFIED IN
•
THREAD CLASS: 2A LOCATION NOT OTHERWISE SPECIFIED A
•
DEPARTURE FROM CITED DESIGNATOR: MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMSFOR LEVEL 1 ITEMS
•
CRITICALITY CODE JUSTIFICATION: ZZZX
•
NONDEFINITIVE SPEC/STD DATA: 1 TYPE
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A193-62T ASSN STD SINGLE MATERIAL RESPONSE
•
THREAD DIRECTION: RIGHT-HAND LOCATION NOT OTHERWISE SPECIFIED
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL THREAD SIZE0.500 INCHES LOCATION NOT OTHERWISE SPECIFIED IN
THREAD CLASS2A LOCATION NOT OTHERWISE SPECIFIED A
DEPARTURE FROM CITED DESIGNATORMATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMSFOR LEVEL 1 ITEMS
CRITICALITY CODE JUSTIFICATIONZZZX
NONDEFINITIVE SPEC/STD DATA1 TYPE
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A193-62T ASSN STD SINGLE MATERIAL RESPONSE
OVERALL LENGTH3.187 INCHES MINIMUM AND 3.313 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND LOCATION NOT OTHERWISE SPECIFIED
HARDNESS RATING25.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM
THREAD QUANTITY PER INCH13 LOCATION NOT OTHERWISE SPECIFIED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
655-8782PCF13L1Interchangeable
interchangeable cross-reference
interchangeable
SS580-845-1930038PC1L1Interchangeable
interchangeable cross-reference
interchangeable
655-8782PCF13Interchangeable
interchangeable cross-reference
interchangeable
1/2-13UNC-2A X 3 1/4L1Interchangeable
Same NIIN cross-reference
interchangeable
MIL-DTL-1222TYIV GRBASTM-A19Interchangeable
Same NIIN cross-reference
interchangeable
MIL-DTL-1222TYIV GRBASTM-A19L1Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1/2-13UNC-2A X 3 1/4?
1/2-13UNC-2A X 3 1/4 is a 1/2-13UNC-2A X 3 1/4.
What parts can replace 1/2-13UNC-2A X 3 1/4?
There are 6 known substitutes for 1/2-13UNC-2A X 3 1/4: 655-8782PCF13L1, SS580-845-1930038PC1L1, 655-8782PCF13 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1/2-13UNC-2A X 3 1/4?
1/2-13UNC-2A X 3 1/4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5307-00-436-1677. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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Last verified: July 2026