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Technical Data Sheet
PartsTable / COMPONENT / 3M1056-6
3M1056-6 ✓ 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: 0.345 INCHES MINIMUM AND 0.355 INCHES MAXIMUM IN, major_thickness: 0.014 INCHES MINIMUM AND 0.020 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-01-181-6236, 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
3M1056-6
NSN: 5325-01-181-6236
FSC: 5325
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialCOBALT ALLOY
end_style90 DEGREE PARALLEL
ring_styleSTRAIGHT GAP
usage_designINTERNAL
inside_diameter0.345 INCHES MINIMUM AND 0.355 INCHES MAXIMUM IN
major_thickness0.014 INCHES MINIMUM AND 0.020 INCHES MAXIMUM IN
outside_diameter0.440 INCHES NOMINAL IN
surface_treatmentPASSIVATE
casehardening_indicatorNOT CASEHARDENED
cross-sectional_shape_styleRECTANGULAR
NSN5325-01-181-6236
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 3M1056-6 · 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
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
INSIDE DIAMETER: 0.345 INCHES MINIMUM AND 0.355 INCHES MAXIMUM IN
•
RING STYLE: STRAIGHT GAP
•
MATERIAL: COBALT ALLOY
•
SURFACE TREATMENT: PASSIVATE
•
USAGE DESIGN: INTERNAL
•
END STYLE: 90 DEGREE PARALLEL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
TECHNICAL CHARACTERISTICS (FLIS)
CASEHARDENING INDICATORNOT CASEHARDENED
INSIDE DIAMETER0.345 INCHES MINIMUM AND 0.355 INCHES MAXIMUM IN
RING STYLESTRAIGHT GAP
MATERIALCOBALT ALLOY
SURFACE TREATMENTPASSIVATE
USAGE DESIGNINTERNAL
END STYLE90 DEGREE PARALLEL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
MAJOR THICKNESS0.014 INCHES MINIMUM AND 0.020 INCHES MAXIMUM IN
OUTSIDE DIAMETER0.440 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
7416Interchangeable
interchangeable cross-reference
interchangeable
7416BInterchangeable
interchangeable cross-reference
interchangeable
72-6970-481Interchangeable
interchangeable cross-reference
interchangeable
506.2500Interchangeable
interchangeable cross-reference
interchangeable
4506-1/4Interchangeable
interchangeable cross-reference
interchangeable
30416Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3M1056-6?
3M1056-6 is a RING,RETAINING.
What parts can replace 3M1056-6?
There are 17 known substitutes for 3M1056-6: 7416, 7416B, 72-6970-481 and 14 more. Substitute compatibility should be verified for your specific system.
Is 3M1056-6 still available?
3M1056-6 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