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PartsTable / COMPONENT / MILR21248TYPE1CLASS1
MILR21248TYPE1CLASS1 ✓ 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 CORROSION RESISTING, ring_style: INTERNAL, usage_design: INTERNAL, major_thickness: 0.042 INCHES NOMINAL IN, outside_diameter: 1.136 INCHES NOMINAL IN, surface_treatment: PASSIVATE. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-721-4513, 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
MILR21248TYPE1CLASS1
NSN: 5325-00-721-4513
FSC: 5325
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL CORROSION RESISTING
ring_styleINTERNAL
usage_designINTERNAL
major_thickness0.042 INCHES NOMINAL IN
outside_diameter1.136 INCHES NOMINAL IN
surface_treatmentPASSIVATE
casehardening_indicatorNOT CASEHARDENED
material_hardness_rating63.0 ROCKWELL SUPERFICIAL 30-N MINIMUM AND 69.5 ROCKWELL SUPERFICIAL 30-N MAXIMUM
cross-sectional_shape_styleRECTANGULAR
NSN5325-00-721-4513
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MILR21248TYPE1CLASS1 · 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
•
MAJOR THICKNESS: 0.075 INCHES MINIMUM AND 0.081 INCHES MAXIMUM IN
•
USAGE DESIGN: INTERNAL
•
SURFACE TREATMENT: CADMIUM AND CHROMATE
•
MATERIAL: STEEL COMP 1066 OR STEEL COMP 1069 OR STEEL COMP 1070 OR STEEL COMP 1072 OR STEEL COMP 1074 OR STEEL COMP 1075 OR STEEL COMP 1078 OR STEEL COMP 1080 OR STEEL COMP 1084 OR STEEL COMP 1086 OR STEEL COMP 1090
•
MATERIAL DOCUMENT AND CLASSIFICATION: FED STD 66 AISI 1066 OR 1069 OR 1070 OR 1072 OR 1074 OR 1075 OR 1078 OR 1080 OR 1084 OR 1086 OR 1090 FED STD SINGLE MATERIAL RESPONSE
•
MATERIAL HARDNESS RATING: 47.0 ROCKWELL C MINIMUM AND 52.0 ROCKWELL C MAXIMUM
•
OUTSIDE DIAMETER: 2.733 INCHES NOMINAL IN
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
TECHNICAL CHARACTERISTICS (FLIS)
MAJOR THICKNESS0.075 INCHES MINIMUM AND 0.081 INCHES MAXIMUM IN
USAGE DESIGNINTERNAL
SURFACE TREATMENTCADMIUM AND CHROMATE
MATERIALSTEEL COMP 1066 OR STEEL COMP 1069 OR STEEL COMP 1070 OR STEEL COMP 1072 OR STEEL COMP 1074 OR STEEL COMP 1075 OR STEEL COMP 1078 OR STEEL COMP 1080 OR STEEL COMP 1084 OR STEEL COMP 1086 OR STEEL COMP 1090
MATERIAL DOCUMENT AND CLASSIFICATIONFED STD 66 AISI 1066 OR 1069 OR 1070 OR 1072 OR 1074 OR 1075 OR 1078 OR 1080 OR 1084 OR 1086 OR 1090 FED STD SINGLE MATERIAL RESPONSE
MATERIAL HARDNESS RATING47.0 ROCKWELL C MINIMUM AND 52.0 ROCKWELL C MAXIMUM
OUTSIDE DIAMETER2.733 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
RING STYLEINTERNAL
CASEHARDENING INDICATORNOT CASEHARDENED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
N5000-118HInterchangeable
interchangeable cross-reference
interchangeable
MILR21248TYPE1CLASS1Interchangeable
interchangeable cross-reference
interchangeable
N5000-X102HInterchangeable
interchangeable cross-reference
interchangeable
218460Interchangeable
interchangeable cross-reference
interchangeable
0130-625-4102Interchangeable
interchangeable cross-reference
interchangeable
N5000-253Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MILR21248TYPE1CLASS1?
MILR21248TYPE1CLASS1 is a RING,RETAINING.
What parts can replace MILR21248TYPE1CLASS1?
There are 9 known substitutes for MILR21248TYPE1CLASS1: N5000-118H, MILR21248TYPE1CLASS1, N5000-X102H and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MILR21248TYPE1CLASS1?
MILR21248TYPE1CLASS1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-721-4513. 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