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Technical Data Sheet
PartsTable / COMPONENT / MIL-DTL-21248
MIL-DTL-21248 ✓ 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 COMP 632, end_style: VERTEX BELOW CENTER, ring_style: EXTERNAL, gap_opening: OPENING 90 DEGREES OR MORE, usage_design: EXTERNAL, inside_diameter: 6.050 INCHES MINIMUM AND 6.120 INCHES MAXIMUM IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-004-3138, 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
MIL-DTL-21248
NSN: 5325-00-004-3138
FSC: 5325
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL COMP 632
end_styleVERTEX BELOW CENTER
ring_styleEXTERNAL
gap_openingOPENING 90 DEGREES OR MORE
usage_designEXTERNAL
inside_diameter6.050 INCHES MINIMUM AND 6.120 INCHES MAXIMUM IN
major_thickness0.151 INCHES MINIMUM AND 0.161 INCHES MAXIMUM IN
strength_ratingERR-060
outside_diameter3.515 INCHES NOMINAL IN
special_featuresCAGE 96906 HAS DISIGN CONTROL
surface_treatmentPASSIVATE
casehardening_indicatorNOT CASEHARDENED
NSN5325-00-004-3138
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MIL-DTL-21248 · 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: 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
•
SURFACE TREATMENT: CADMIUM AND CHROMATE
•
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 ALL MATERIAL RESPONSES
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
OUTSIDE DIAMETER: 5.705 INCHES MINIMUM AND 5.835 INCHES MAXIMUM IN
•
USAGE DESIGN: INTERNAL
•
RING STYLE: INTERNAL
TECHNICAL CHARACTERISTICS (FLIS)
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
SURFACE TREATMENTCADMIUM AND CHROMATE
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 ALL MATERIAL RESPONSES
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
CASEHARDENING INDICATORNOT CASEHARDENED
OUTSIDE DIAMETER5.705 INCHES MINIMUM AND 5.835 INCHES MAXIMUM IN
USAGE DESIGNINTERNAL
RING STYLEINTERNAL
MATERIAL HARDNESS RATING45.0 ROCKWELL C MINIMUM AND 52.0 ROCKWELL C MAXIMUM
MAJOR THICKNESS0.121 INCHES MINIMUM AND 0.129 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
MS16625-1525Interchangeable
Same NIIN cross-reference
interchangeable
3000-X525-ST-CDInterchangeable
Same NIIN cross-reference
interchangeable
N1300-525CDInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MIL-DTL-21248?
MIL-DTL-21248 is a RING,RETAINING.
What parts can replace MIL-DTL-21248?
There are 3 known substitutes for MIL-DTL-21248: MS16625-1525, 3000-X525-ST-CD, N1300-525CD. Substitute compatibility should be verified for your specific system.
What is the NSN for MIL-DTL-21248?
MIL-DTL-21248 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-004-3138. 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