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Technical Data Sheet
PartsTable / COMPONENT / 1021-364
1021-364 ✓ 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: HOOKED, usage_design: INTERNAL, inside_diameter: 0.749 INCHES MINIMUM AND 0.780 INCHES MAXIMUM IN, outside_diameter: 0.875 INCHES MINIMUM AND 0.906 INCHES MAXIMUM IN, special_features: 3/4 IN. FROM OUTSIDE RADIUS OF HOOKED END TO TOP OF RING AND 5/16 IN.

GAP OPENING IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-143-6669, 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
1021-364
NSN: 5325-00-143-6669
FSC: 5325
CAGE: 10137 — SZEMCO INC (USA)
SPECIFICATIONS
materialSTEEL
ring_styleHOOKED
usage_designINTERNAL
inside_diameter0.749 INCHES MINIMUM AND 0.780 INCHES MAXIMUM IN
outside_diameter0.875 INCHES MINIMUM AND 0.906 INCHES MAXIMUM IN
special_features3/4 IN. FROM OUTSIDE RADIUS OF HOOKED END TO TOP OF RING AND 5/16 IN. GAP OPENING IN
material_diameter0.063 INCHES NOMINAL IN
casehardening_indicatorNOT CASEHARDENED
cross-sectional_shape_styleROUND
NSN5325-00-143-6669
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 1021-364 · 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
•
INSIDE DIAMETER: 0.749 INCHES MINIMUM AND 0.780 INCHES MAXIMUM IN
•
CROSS-SECTIONAL SHAPE STYLE: ROUND
•
MATERIAL: STEEL
•
USAGE DESIGN: INTERNAL
•
OUTSIDE DIAMETER: 0.875 INCHES MINIMUM AND 0.906 INCHES MAXIMUM IN
•
RING STYLE: HOOKED
•
MATERIAL DIAMETER: 0.063 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
INSIDE DIAMETER0.749 INCHES MINIMUM AND 0.780 INCHES MAXIMUM IN
CROSS-SECTIONAL SHAPE STYLEROUND
SPECIAL FEATURES3/4 IN. FROM OUTSIDE RADIUS OF HOOKED END TO TOP OF RING AND 5/16 IN. GAP OPENING IN
MATERIALSTEEL
USAGE DESIGNINTERNAL
OUTSIDE DIAMETER0.875 INCHES MINIMUM AND 0.906 INCHES MAXIMUM IN
RING STYLEHOOKED
MATERIAL DIAMETER0.063 INCHES NOMINAL IN
CASEHARDENING INDICATORNOT CASEHARDENED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
PK52AInterchangeable
interchangeable cross-reference
interchangeable
PK52Interchangeable
interchangeable cross-reference
interchangeable
90106Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1021-364?
1021-364 is a RING,RETAINING.
What parts can replace 1021-364?
There are 3 known substitutes for 1021-364: PK52A, PK52, 90106. Substitute compatibility should be verified for your specific system.
Is 1021-364 still available?
1021-364 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