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Technical Data Sheet
PartsTable / COMPONENT / 3M1056A5
3M1056A5 ✓ 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 RING,RETAINING is a the manufacturer industrial component. Key specifications include material: COBALT ALLOY, end_style: 90 DEGREE PARALLEL, ring_style: STRAIGHT GAP, usage_design: INTERNAL, inside_diameter: 0.286 INCHES MINIMUM IN, major_thickness: 0.020 INCHES MAXIMUM IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-01-253-4543, 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
3M1056A5
NSN: 5325-01-253-4543
FSC: 5325
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialCOBALT ALLOY
end_style90 DEGREE PARALLEL
ring_styleSTRAIGHT GAP
usage_designINTERNAL
inside_diameter0.286 INCHES MINIMUM IN
major_thickness0.020 INCHES MAXIMUM IN
outside_diameter0.366 INCHES MAXIMUM IN
surface_treatmentPASSIVATE
casehardening_indicatorNOT CASEHARDENED
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationELGILOY, ELGIN NATIONAL INDUSTRIES INC MFR REF SINGLE MATERIAL RESPONSE
NSN5325-01-253-4543
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 3M1056A5 · 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
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
OUTSIDE DIAMETER: 0.366 INCHES MAXIMUM IN
•
USAGE DESIGN: INTERNAL
•
SURFACE TREATMENT: PASSIVATE
•
MATERIAL DOCUMENT AND CLASSIFICATION: ELGILOY, ELGIN NATIONAL INDUSTRIES INC MFR REF SINGLE MATERIAL RESPONSE
•
MATERIAL: COBALT ALLOY
•
RING STYLE: STRAIGHT GAP
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
TECHNICAL CHARACTERISTICS (FLIS)
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
OUTSIDE DIAMETER0.366 INCHES MAXIMUM IN
USAGE DESIGNINTERNAL
SURFACE TREATMENTPASSIVATE
MATERIAL DOCUMENT AND CLASSIFICATIONELGILOY, ELGIN NATIONAL INDUSTRIES INC MFR REF SINGLE MATERIAL RESPONSE
MATERIALCOBALT ALLOY
RING STYLESTRAIGHT GAP
CASEHARDENING INDICATORNOT CASEHARDENED
END STYLE90 DEGREE PARALLEL
INSIDE DIAMETER0.286 INCHES MINIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
177003-64Interchangeable
interchangeable cross-reference
interchangeable
K7405Interchangeable
interchangeable cross-reference
interchangeable
30405Interchangeable
interchangeable cross-reference
interchangeable
SCB21669Interchangeable
interchangeable cross-reference
interchangeable
30405REV2Interchangeable
interchangeable cross-reference
interchangeable
22529991Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3M1056A5?
3M1056A5 is a RING,RETAINING.
What parts can replace 3M1056A5?
There are 14 known substitutes for 3M1056A5: 177003-64, K7405, 30405 and 11 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 3M1056A5?
3M1056A5 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-01-253-4543. 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.
PartsTable Design LLC · partstable.com
Last verified: July 2026