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RR256C — RING,RETAINING

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

RR256C: RING,RETAINING.

The RING,RETAINING is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1070 OR STEEL COMP 1074 OR STEEL COMP 1080 OR STEEL COMP 1085 OR STEEL COMP 1090, ring_style: SPECIAL FLAT, usage_design: INTERNAL, inside_diameter: 2.377 INCHES NOMINAL IN, major_thickness: 0.048 INCHES NOMINAL IN, strength_rating: ERR-060. This part is cataloged in the U.S.

Government catalog under NSN 5325-00-282-1643, 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
RR256C
NSN: 5325-00-282-1643
FSC: 5325 — Fastening Devices
CAGE: 80756 — SPIROLOX INC (USA)
SPECIFICATIONS
materialSTEEL COMP 1070 OR STEEL COMP 1074 OR STEEL COMP 1080 OR STEEL COMP 1085 OR STEEL COMP 1090
ring_styleSPECIAL FLAT
usage_designINTERNAL
inside_diameter2.377 INCHES NOMINAL IN
major_thickness0.048 INCHES NOMINAL IN
strength_ratingERR-060
outside_diameter2.673 INCHES NOMINAL IN
surface_treatmentCADMIUM
casehardening_indicatorNOT CASEHARDENED
material_hardness_rating45.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM
cross-sectional_shape_styleDOUBLE OVAL
material_document_and_classificationASTM A576 COMP FS1070,FS1074,FS1080,FS1085,OR FS1090 ASSN STD SINGLE MATERIAL RESPONSE
NSN5325-00-282-1643
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: RR256C · 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
•
MATERIAL HARDNESS RATING: 45.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM
•
USAGE DESIGN: INTERNAL
•
STRENGTH RATING: ERR-060
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A576 COMP FS1070,FS1074,FS1080,FS1085,OR FS1090 ASSN STD SINGLE MATERIAL RESPONSE
•
CROSS-SECTIONAL SHAPE STYLE: DOUBLE OVAL
•
OUTSIDE DIAMETER: 2.673 INCHES NOMINAL IN
•
MAJOR THICKNESS: 0.048 INCHES NOMINAL IN
•
INSIDE DIAMETER: 2.377 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
MATERIAL HARDNESS RATING45.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM
USAGE DESIGNINTERNAL
STRENGTH RATINGERR-060
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A576 COMP FS1070,FS1074,FS1080,FS1085,OR FS1090 ASSN STD SINGLE MATERIAL RESPONSE
CROSS-SECTIONAL SHAPE STYLEDOUBLE OVAL
OUTSIDE DIAMETER2.673 INCHES NOMINAL IN
MAJOR THICKNESS0.048 INCHES NOMINAL IN
INSIDE DIAMETER2.377 INCHES NOMINAL IN
CASEHARDENING INDICATORNOT CASEHARDENED
RING STYLESPECIAL FLAT
OTHER ITEMS IN FSC 5325 — Fastening Devices
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5325-00-000-1884 5325-00-000-9988 5325-00-001-1567 5325-00-001-2043 5325-00-001-3842 5325-00-001-3858 5325-00-001-3871 5325-00-001-4317
SUBSTITUTES & CROSS-REFERENCES 1
626-001-9188Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is RR256C?
RR256C is a RING,RETAINING.
What parts can replace RR256C?
There is 1 known substitute for RR256C: 626-001-9188. Substitute compatibility should be verified for your specific system.
What is the NSN for RR256C?
RR256C is cataloged in the U.S. Government catalog under NSN 5325-00-282-1643. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.