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PartsTable / COMPONENT / MIL-R-21248B TY 1 CL 1
MIL-R-21248B TY 1 CL 1 ✓ 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 ring_style: INTERNAL, usage_design: INTERNAL, major_thickness: 0.013 INCHES MINIMUM AND 0.017 INCHES MAXIMUM IN, outside_diameter: 0.341 INCHES MINIMUM AND 0.356 INCHES MAXIMUM IN, surface_treatment: CADMIUM AND CHROMATE, casehardening_indicator: NOT CASEHARDENED. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-804-9732, 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-R-21248B TY 1 CL 1
NSN: 5325-00-804-9732
FSC: 5325
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
ring_styleINTERNAL
usage_designINTERNAL
major_thickness0.013 INCHES MINIMUM AND 0.017 INCHES MAXIMUM IN
outside_diameter0.341 INCHES MINIMUM AND 0.356 INCHES MAXIMUM IN
surface_treatmentCADMIUM AND CHROMATE
casehardening_indicatorNOT CASEHARDENED
material_hardness_rating67.5 ROCKWELL SUPERFICIAL 30-N MINIMUM AND 72.0 ROCKWELL SUPERFICIAL 30-N MAXIMUM
cross-sectional_shape_styleRECTANGULAR
NSN5325-00-804-9732
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MIL-R-21248B TY 1 CL 1 · 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
•
MATERIAL DOCUMENT AND CLASSIFICATION: FED-STD-66,NO. 1066 THRU 1090 FED STD SINGLE MATERIAL RESPONSE
•
RING STYLE: INTERNAL
•
OUTSIDE DIAMETER: 3.826 INCHES NOMINAL IN
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
MAJOR THICKNESS: 0.109 INCHES NOMINAL IN
•
MATERIAL HARDNESS RATING: 45.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL
MATERIAL DOCUMENT AND CLASSIFICATIONFED-STD-66,NO. 1066 THRU 1090 FED STD SINGLE MATERIAL RESPONSE
RING STYLEINTERNAL
OUTSIDE DIAMETER3.826 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
MAJOR THICKNESS0.109 INCHES NOMINAL IN
MATERIAL HARDNESS RATING45.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM
CASEHARDENING INDICATORNOT CASEHARDENED
USAGE DESIGNINTERNAL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 31
11-022Interchangeable
interchangeable cross-reference
interchangeable
11-022-7446-70Interchangeable
interchangeable cross-reference
interchangeable
1350-1AInterchangeable
interchangeable cross-reference
interchangeable
61282Interchangeable
interchangeable cross-reference
interchangeable
1144-2GEInterchangeable
interchangeable cross-reference
interchangeable
FFS92TYPEISTYLE8SInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MIL-R-21248B TY 1 CL 1?
MIL-R-21248B TY 1 CL 1 is a RING,RETAINING.
What parts can replace MIL-R-21248B TY 1 CL 1?
There are 31 known substitutes for MIL-R-21248B TY 1 CL 1: 11-022, 11-022-7446-70, 1350-1A and 28 more. Substitute compatibility should be verified for your specific system.
Is MIL-R-21248B TY 1 CL 1 still available?
MIL-R-21248B TY 1 CL 1 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026