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PartsTable / COMPONENT / RRN256
RRN256 ✓ 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: STEEL, ring_style: INTERNAL, usage_design: INTERNAL, major_thickness: 0.093 INCHES NOMINAL IN, outside_diameter: 2.844 INCHES NOMINAL IN, casehardening_indicator: NOT CASEHARDENED. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-923-6731, 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
RRN256
NSN: 5325-00-923-6731
FSC: 5325
CAGE: 54362 — SPIR-O-LOK INC (USA)
SPECIFICATIONS
materialSTEEL
ring_styleINTERNAL
usage_designINTERNAL
major_thickness0.093 INCHES NOMINAL IN
outside_diameter2.844 INCHES NOMINAL IN
casehardening_indicatorNOT CASEHARDENED
material_hardness_rating47.0 ROCKWELL C MINIMUM AND 52.0 ROCKWELL C MAXIMUM
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationFED STD NO. 66 AISI C1066 THRU C1090 FED STD SINGLE MATERIAL RESPONSE OR SAE 1070 THRU 1090 ASSN STD SINGLE MATERIAL RESPONSE
NSN5325-00-923-6731
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: RRN256 · 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
•
USAGE DESIGN: INTERNAL
•
MATERIAL HARDNESS RATING: 47.0 ROCKWELL C MINIMUM AND 52.0 ROCKWELL C MAXIMUM
•
MATERIAL: STEEL
•
MATERIAL DOCUMENT AND CLASSIFICATION: FED STD NO. 66 AISI C1066 THRU C1090 FED STD SINGLE MATERIAL RESPONSE OR SAE 1070 THRU 1090 ASSN STD SINGLE MATERIAL RESPONSE
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
MAJOR THICKNESS: 0.093 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 2.844 INCHES NOMINAL IN
•
RING STYLE: INTERNAL
TECHNICAL CHARACTERISTICS (FLIS)
USAGE DESIGNINTERNAL
MATERIAL HARDNESS RATING47.0 ROCKWELL C MINIMUM AND 52.0 ROCKWELL C MAXIMUM
MATERIALSTEEL
MATERIAL DOCUMENT AND CLASSIFICATIONFED STD NO. 66 AISI C1066 THRU C1090 FED STD SINGLE MATERIAL RESPONSE OR SAE 1070 THRU 1090 ASSN STD SINGLE MATERIAL RESPONSE
CASEHARDENING INDICATORNOT CASEHARDENED
MAJOR THICKNESS0.093 INCHES NOMINAL IN
OUTSIDE DIAMETER2.844 INCHES NOMINAL IN
RING STYLEINTERNAL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
1N256Interchangeable
interchangeable cross-reference
interchangeable
MILS19500-194Interchangeable
interchangeable cross-reference
interchangeable
991Interchangeable
interchangeable cross-reference
interchangeable
528-26REVCPCP50012603Interchangeable
interchangeable cross-reference
interchangeable
68-40500-1504Interchangeable
interchangeable cross-reference
interchangeable
1N1128AInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is RRN256?
RRN256 is a RING,RETAINING.
What parts can replace RRN256?
There are 13 known substitutes for RRN256: 1N256, MILS19500-194, 991 and 10 more. Substitute compatibility should be verified for your specific system.
What is the NSN for RRN256?
RRN256 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-923-6731. 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