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Technical Data Sheet
PartsTable / COMPONENT / 1-4 20X3-4
1-4 20X3-4 ✓ 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 SCREW AND NUT ASS. is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: HEXAGON, head_height: 0.181 INCHES NOMINAL IN, thread_class: 2A A, thread_length: 0.650 INCHES MINIMUM IN, fastener_length: 0.750 INCHES NOMINAL IN.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-012-1887, 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 20X3-4
NSN: 5305-00-012-1887
FSC: 5305
CAGE: 35211 — LAUSON DIVISION OF TECUMSEH PRODUCTS CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEXAGON
head_height0.181 INCHES NOMINAL IN
thread_class2A A
thread_length0.650 INCHES MINIMUM IN
fastener_length0.750 INCHES NOMINAL IN
hardness_rating80.0 ROCKWELL B MINIMUM OVERALL
thread_directionRIGHT-HAND
surface_treatmentCADMIUM AND CHROMATE OR ZINC OVERALL
width_between_flats0.371 INCHES NOMINAL IN
nominal_thread_diameter0.250 INCHES IN
minimum_tensile_strength175000 POUNDS PER SQUARE INCH LBS
NSN5305-00-012-1887
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 1-4 20X3-4 · 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
•
FASTENER LENGTH: 0.750 INCHES NOMINAL IN
•
HEAD STYLE: HEXAGON
•
HARDNESS RATING: 80.0 ROCKWELL B MINIMUM AND 100.0 ROCKWELL B MAXIMUM OVERALL
•
THREAD DIRECTION: RIGHT-HAND
•
SURFACE FINISH: 63.0 MICROINCHES THREADS
•
MATERIAL: STEEL OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE GR 2 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
FASTENER LENGTH0.750 INCHES NOMINAL IN
HEAD STYLEHEXAGON
HARDNESS RATING80.0 ROCKWELL B MINIMUM AND 100.0 ROCKWELL B MAXIMUM OVERALL
THREAD DIRECTIONRIGHT-HAND
SURFACE FINISH63.0 MICROINCHES THREADS
MATERIALSTEEL OVERALL
SURFACE FINISH125.0 MICROINCHES BEARING SURFACE OF HEAD
MATERIAL DOCUMENT AND CLASSIFICATIONSAE GR 2 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
THREAD LENGTH0.750 INCHES MAXIMUM IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
VERIFIED SUBSTITUTES & CROSS-REFERENCES 24
1003050026Interchangeable
interchangeable cross-reference
interchangeable
912-3103-0769Interchangeable
interchangeable cross-reference
interchangeable
107-0401Interchangeable
interchangeable cross-reference
interchangeable
G3728Interchangeable
interchangeable cross-reference
interchangeable
1218-87Interchangeable
interchangeable cross-reference
interchangeable
1218-087-00Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1-4 20X3-4?
1-4 20X3-4 is a SCREW AND NUT ASS..
What parts can replace 1-4 20X3-4?
There are 24 known substitutes for 1-4 20X3-4: 1003050026, 912-3103-0769, 107-0401 and 21 more. Substitute compatibility should be verified for your specific system.
Is 1-4 20X3-4 still available?
1-4 20X3-4 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026