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Technical Data Sheet
PartsTable / MRO / A-1-256
A-1-256 ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
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 BEARING,BALL,ANNULAR is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, bore_shape: STRAIGHT, head_style: HEXAGON, head_height: 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN, point_style: FLAT, point_length: 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-529-1728, 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
MRO→ MRO_GENERAL→ A-1-256
NSN: 5305-00-529-1728
FSC: 5305
CAGE: 34623 — AM GENERAL LLC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
bore_shapeSTRAIGHT
head_styleHEXAGON
head_height0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
point_styleFLAT
point_length0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
thread_class2A A
bore_diameter0.7500 INCHES MINIMUM AND 0.7550 INCHES MAXIMUM IN
thread_length1.182 INCHES MINIMUM AND 1.183 INCHES MAXIMUM IN
inclosure_typeHERMETICALLY SEALED
point_diameter0.307 INCHES MINIMUM AND 0.317 INCHES MAXIMUM IN
fastener_length1.302 INCHES MINIMUM AND 1.322 INCHES MAXIMUM IN
NSN5305-00-529-1728
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: A-1-256 · 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
•
INTERNAL DRIVE STYLE: W/O INTERNAL DRIVE
•
THREAD QUANTITY PER INCH: 24
•
POINT LENGTH: 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
•
SURFACE TREATMENT: ZINC OVERALL
•
THREAD SERIES DESIGNATOR: UNF
•
MATERIAL: STEEL OVERALL
•
THREAD CLASS: 2A A
•
THREAD LENGTH: 1.182 INCHES MINIMUM AND 1.183 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
INTERNAL DRIVE STYLEW/O INTERNAL DRIVE
THREAD QUANTITY PER INCH24
POINT LENGTH0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
SURFACE TREATMENTZINC OVERALL
THREAD SERIES DESIGNATORUNF
MATERIALSTEEL OVERALL
THREAD CLASS2A A
THREAD LENGTH1.182 INCHES MINIMUM AND 1.183 INCHES MAXIMUM IN
WIDTH BETWEEN FLATS0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
A1256Interchangeable
interchangeable cross-reference
interchangeable
40897Interchangeable
interchangeable cross-reference
interchangeable
135022Interchangeable
interchangeable cross-reference
interchangeable
B202227Interchangeable
interchangeable cross-reference
interchangeable
303001Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-14652Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A-1-256?
A-1-256 is a BEARING,BALL,ANNULAR. It is classified as a MRO (MRO_GENERAL).
What parts can replace A-1-256?
There are 16 known substitutes for A-1-256: A1256, 40897, 135022 and 13 more. Substitute compatibility should be verified for your specific system.
Is A-1-256 still available?
A-1-256 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