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MILR21248 — RING,RETAINING

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

MILR21248: RING,RETAINING.

The RING,RETAINING is a the manufacturer industrial component. Key specifications include material: STEEL, end_style: 90 DEGREE PARALLEL, usage_design: EXTERNAL, inside_diameter: 0.288 INCHES MINIMUM AND 0.296 INCHES MAXIMUM IN, major_thickness: 0.375 INCHES NOMINAL IN, strength_rating: ERR-060. This part is cataloged in the U.S.

Government catalog under NSN 5325-00-010-2509, 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
MILR21248
NSN: 5325-00-010-2509
NIINs: 000102509, 000676910, 000685275, 000718907, 001869222, 002002637, 002054208, 002054731, 002056552, 002524725, 002524758, 002527750, 002604883, 002635907, 002816623, 002827120, 002827202, 002986563, 002986564, 003478254, 005140393, 005307957, 005762457, 005980933, 005981414, 005984321, 005986232, 005986334, 006197229, 006821762, 006822070, 006873378, 006873379, 007151152, 007209221, 007209230, 007209235, 007209236, 007217680, 007218360, 007256248, 007272810, 007366335, 007533699, 007533868, 007533929, 007541082, 007541083, 007541619, 007541896, 008007865, 008009928, 008013006, 008036226, 008036227, 008036228, 008037299, 008037301, 008037302, 008037303, 008037304, 008037306, 008037307, 008037308, 008037312, 008037313, 008037314, 008037315, 008037316, 008037317, 008037319, 008037320, 008037321, 008037322, 008038516, 008038518, 008039970, 008039971, 008039974, 008039975, 008039976, 008039977, 008039978, 008039981, 008041509, 008041513, 008042025, 008042026, 008042027, 008042184, 008042185, 008042188, 008042191, 008042192, 008042193, 008042269, 008042270, 008042273, 008042274, 008042275, 008042775, 008042779, 008046896, 008047683, 008047701, 008049732, 008049734, 008049735, 008049737, 008049738, 008049739, 008049740, 008049743, 008049746, 008051072, 008051398, 008056002, 008056004, 008077968, 008080350, 008222136, 008802666, 008915580, 009522237, 010263243, 010263244, 011169577, 011231088, 011262826, 011662057, 012834763, 012931190, 013233132, 014360117, 014678534, 014940000, 014964840
FSC: 5325 — Fastening Devices
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL
end_style90 DEGREE PARALLEL
ring_styleE
usage_designEXTERNAL
inside_diameter0.288 INCHES MINIMUM AND 0.296 INCHES MAXIMUM IN
major_thickness0.375 INCHES NOMINAL IN
strength_ratingERR-060
special_featuresZINC COATING; FOR USE ON A 1.000 INCH DIAMETER SHAFT IN
surface_treatmentCADMIUM AND PHOSPHATE
casehardening_indicatorNOT CASEHARDENED
material_hardness_rating44.500 ROCKWELL C NOMINAL
cross-sectional_shape_styleRECTANGULAR
NSN5325-00-010-2509
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MILR21248 · 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: 48.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM
•
USAGE DESIGN: EXTERNAL
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE 1065 TO 1090 ASSN STD SINGLE MATERIAL RESPONSE
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
MAJOR THICKNESS: 0.023 INCHES MINIMUM AND 0.028 INCHES MAXIMUM IN
•
INSIDE DIAMETER: 0.142 INCHES MINIMUM AND 0.146 INCHES MAXIMUM IN
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
RING STYLE: E
TECHNICAL CHARACTERISTICS
MATERIAL HARDNESS RATING48.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM
USAGE DESIGNEXTERNAL
MATERIAL DOCUMENT AND CLASSIFICATIONSAE 1065 TO 1090 ASSN STD SINGLE MATERIAL RESPONSE
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
MAJOR THICKNESS0.023 INCHES MINIMUM AND 0.028 INCHES MAXIMUM IN
INSIDE DIAMETER0.142 INCHES MINIMUM AND 0.146 INCHES MAXIMUM IN
CASEHARDENING INDICATORNOT CASEHARDENED
RING STYLEE
SURFACE TREATMENTCADMIUM AND DICHROMATE
MATERIALSTEEL
SUBSTITUTES & CROSS-REFERENCES 4
MS16633-1018Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
855514-00Reference document
Same NSN cross-reference
Reference document — Secondary reference
9419254Reference document
Same NSN cross-reference
Reference document — Secondary reference
FD9005-3Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is MILR21248?
MILR21248 is a RING,RETAINING.
What parts can replace MILR21248?
There are 4 known substitutes for MILR21248: MS16633-1018, 855514-00, 9419254 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MILR21248?
MILR21248 is cataloged in the U.S. Government catalog under NSN 5325-00-010-2509. This indicates validated use in U.S. government and defense supply chains.
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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.