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1/4 IN-20 UNC-2A X 1 1/4 IN 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: 0.452 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN, thread_length: 1.150 INCHES MINIMUM AND 1.250 INCHES MAXIMUM IN, screw_material: NICKEL ALLOY 400, fastener_length: 1.250 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System under NSN 5305-01-269-7392, 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
1/4 IN-20 UNC-2A X 1 1/4 IN LG
NSN: 5305-01-269-7392
FSC: 5305
CAGE: 81348 — FEDERAL SPECIFICATIONS PROMULGATED BY GENERAL SERVICES ADMINISTRATION WASHINGTON DC (USA)
SPECIFICATIONS
head_styleFLAT COUNTERSUNK
thread_class2A A
head_diameter0.452 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN
thread_length1.150 INCHES MINIMUM AND 1.250 INCHES MAXIMUM IN
screw_materialNICKEL ALLOY 400
fastener_length1.250 INCHES NOMINAL IN
thread_directionRIGHT-HAND
countersink_angle82.0 DEGREES NOMINAL
internal_drive_styleSLOT
nominal_thread_diameter0.250 INCHES IN
minimum_tensile_strength80000 POUNDS PER SQUARE INCH LBS
thread_quantity_per_inch20
NSN5305-01-269-7392
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 1/4 IN-20 UNC-2A X 1 1/4 IN 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
•
HEAD STYLE: FLAT COUNTERSUNK
•
THREAD CLASS: 2A A
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
COUNTERSINK ANGLE: 82.0 DEGREES NOMINAL
•
SCREW MATERIAL DOCUMENT AND CLASSIFICATION: QQ-N-281 CL A FED SPEC SINGLE MATERIAL RESPONSE
•
INTERNAL DRIVE STYLE: SLOT
•
MINIMUM TENSILE STRENGTH: 80000 POUNDS PER SQUARE INCH LBS
•
THREAD LENGTH: 1.150 INCHES MINIMUM AND 1.250 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
HEAD STYLEFLAT COUNTERSUNK
THREAD CLASS2A A
NOMINAL THREAD DIAMETER0.250 INCHES IN
COUNTERSINK ANGLE82.0 DEGREES NOMINAL
SCREW MATERIAL DOCUMENT AND CLASSIFICATIONQQ-N-281 CL A FED SPEC SINGLE MATERIAL RESPONSE
INTERNAL DRIVE STYLESLOT
MINIMUM TENSILE STRENGTH80000 POUNDS PER SQUARE INCH LBS
THREAD LENGTH1.150 INCHES MINIMUM AND 1.250 INCHES MAXIMUM IN
SCREW MATERIALNICKEL ALLOY 400
HEAD DIAMETER0.452 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN
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 13UNC-2A X 2IN 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 1/4 IN-20 UNC-2A X 1 1/4 IN LG?
1/4 IN-20 UNC-2A X 1 1/4 IN LG is a SCREW,MACHINE.
What parts can replace 1/4 IN-20 UNC-2A X 1 1/4 IN LG?
There are 10 known substitutes for 1/4 IN-20 UNC-2A X 1 1/4 IN 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 1/4 IN-20 UNC-2A X 1 1/4 IN LG?
1/4 IN-20 UNC-2A X 1 1/4 IN LG is cataloged in the Federal Logistics Information System under NSN 5305-01-269-7392. This indicates validated use in U.S. government and defense supply chains.
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Last verified: October 2026