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1/2 IN 13UNC-2A X 2IN LG — Technical Data Sheet

✓ 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 SCREW,MACHINE is a the manufacturer industrial component. Key specifications include head_style: FLAT COUNTERSUNK, thread_class: 2A A, head_diameter: 0.775 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN, thread_length: 1.816 INCHES MINIMUM AND 2.000 INCHES MAXIMUM IN, screw_material: NICKEL ALLOY 400, fastener_length: 1.970 INCHES MINIMUM AND 2.000 INCHES MAXIMUM IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System under NSN 5305-01-252-1372, 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 IN 13UNC-2A X 2IN LG
NSN: 5305-01-252-1372
FSC: 5305
CAGE: 81348 — FEDERAL SPECIFICATIONS PROMULGATED BY GENERAL SERVICES ADMINISTRATION WASHINGTON DC (USA)
SPECIFICATIONS
head_styleFLAT COUNTERSUNK
thread_class2A A
head_diameter0.775 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN
thread_length1.816 INCHES MINIMUM AND 2.000 INCHES MAXIMUM IN
screw_materialNICKEL ALLOY 400
fastener_length1.970 INCHES MINIMUM AND 2.000 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
countersink_angle82.0 DEGREES NOMINAL
internal_drive_styleSLOT
nominal_thread_diameter0.500 INCHES IN
minimum_tensile_strength80000 POUNDS PER SQUARE INCH LBS
thread_quantity_per_inch13
NSN5305-01-252-1372
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 1/2 IN 13UNC-2A X 2IN LG · 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 CLASS: 2A A
•
THREAD LENGTH: 1.816 INCHES MINIMUM AND 2.000 INCHES MAXIMUM IN
•
HEAD DIAMETER: 0.775 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
HEAD STYLE: FLAT COUNTERSUNK
•
FASTENER LENGTH: 1.970 INCHES MINIMUM AND 2.000 INCHES MAXIMUM IN
•
SCREW MATERIAL DOCUMENT AND CLASSIFICATION: QQ-N-281 CLASSA FED SPEC SINGLE MATERIAL RESPONSE
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
THREAD CLASS2A A
THREAD LENGTH1.816 INCHES MINIMUM AND 2.000 INCHES MAXIMUM IN
HEAD DIAMETER0.775 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
HEAD STYLEFLAT COUNTERSUNK
FASTENER LENGTH1.970 INCHES MINIMUM AND 2.000 INCHES MAXIMUM IN
SCREW MATERIAL DOCUMENT AND CLASSIFICATIONQQ-N-281 CLASSA FED SPEC SINGLE MATERIAL RESPONSE
THREAD DIRECTIONRIGHT-HAND
INTERNAL DRIVE STYLESLOT
COUNTERSINK ANGLE82.0 DEGREES NOMINAL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
245122InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
FF-S-92 TY-1 ST Y-2SInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
MS35200-12InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
49715-05-01R01 ITEM 6InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
203-2581151 ITEM 6InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
1/2 IN- 13 UNC-2A X 1 IN LGInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1/2 IN 13UNC-2A X 2IN LG?
1/2 IN 13UNC-2A X 2IN LG is a SCREW,MACHINE.
What parts can replace 1/2 IN 13UNC-2A X 2IN LG?
There are 10 known substitutes for 1/2 IN 13UNC-2A X 2IN LG: 245122, FF-S-92 TY-1 ST Y-2S, MS35200-12 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1/2 IN 13UNC-2A X 2IN LG?
1/2 IN 13UNC-2A X 2IN LG is cataloged in the Federal Logistics Information System under NSN 5305-01-252-1372. This indicates validated use in U.S. government and defense supply chains.
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Last verified: October 2026