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Technical Data Sheet
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4000-243-ST — RING,RETAINING

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

4000-243-ST: RING,RETAINING.

The RING,RETAINING is a the manufacturer industrial component. Key specifications include ring_style: INTERNAL INVERTED LUGS, usage_design: INTERNAL, major_thickness: 0.075 INCHES MINIMUM AND 0.081 INCHES MAXIMUM IN, outside_diameter: 2.619 INCHES MINIMUM AND 2.659 INCHES MAXIMUM IN, casehardening_indicator: NOT CASEHARDENED, material_hardness_rating: 47.0 ROCKWELL C MINIMUM AND 52.0 ROCKWELL C MAXIMUM. This part is cataloged in the U.S.

Government catalog under NSN 5325-01-280-8110, 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
4000-243-ST
NSN: 5325-01-280-8110
FSC: 5325 — Fastening Devices
CAGE: 07382 — ROTOR CLIP COMPANY, INC. (USA)
SPECIFICATIONS
ring_styleINTERNAL INVERTED LUGS
usage_designINTERNAL
major_thickness0.075 INCHES MINIMUM AND 0.081 INCHES MAXIMUM IN
outside_diameter2.619 INCHES MINIMUM AND 2.659 INCHES MAXIMUM IN
casehardening_indicatorNOT CASEHARDENED
material_hardness_rating47.0 ROCKWELL C MINIMUM AND 52.0 ROCKWELL C MAXIMUM
cross-sectional_shape_styleRECTANGULAR
NSN5325-01-280-8110
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 4000-243-ST · 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: 47.0 ROCKWELL C MINIMUM AND 52.0 ROCKWELL C MAXIMUM
•
USAGE DESIGN: INTERNAL
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE 1060 ASSN STD 1ST MATERIAL RESPONSE OR SAE 1064 ASSN STD 2ND MATERIAL RESPONSE OR SAE 1065 ASSN STD 3RD MATERIAL RESPONSE OR SAE 1070 ASSN STD 4TH MATERIAL RESPONSE OR SAE 1074 ASSN STD 5TH MATERIAL RESPONSE OR SAE 1078 ASSN STD 6TH MATERIAL RESPONSE OR SAE 1080 ASSN STD 7TH MATERIAL RESPONSE OR SAE 1084 ASSN STD 8TH MATERIAL RESPONSE OR SAE 1085 ASSN STD 9TH MATERIAL RESPONSE OR SAE 1086 ASSN STD 10TH MATERIAL RESPONSE OR SAE 1090 ASSN STD 11TH MATERIAL RESPONSE
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
OUTSIDE DIAMETER: 2.619 INCHES MINIMUM AND 2.659 INCHES MAXIMUM IN
•
MAJOR THICKNESS: 0.075 INCHES MINIMUM AND 0.081 INCHES MAXIMUM IN
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
RING STYLE: INTERNAL INVERTED LUGS
TECHNICAL CHARACTERISTICS
MATERIAL HARDNESS RATING47.0 ROCKWELL C MINIMUM AND 52.0 ROCKWELL C MAXIMUM
USAGE DESIGNINTERNAL
MATERIAL DOCUMENT AND CLASSIFICATIONSAE 1060 ASSN STD 1ST MATERIAL RESPONSE OR SAE 1064 ASSN STD 2ND MATERIAL RESPONSE OR SAE 1065 ASSN STD 3RD MATERIAL RESPONSE OR SAE 1070 ASSN STD 4TH MATERIAL RESPONSE OR SAE 1074 ASSN STD 5TH MATERIAL RESPONSE OR SAE 1078 ASSN STD 6TH MATERIAL RESPONSE OR SAE 1080 ASSN STD 7TH MATERIAL RESPONSE OR SAE 1084 ASSN STD 8TH MATERIAL RESPONSE OR SAE 1085 ASSN STD 9TH MATERIAL RESPONSE OR SAE 1086 ASSN STD 10TH MATERIAL RESPONSE OR SAE 1090 ASSN STD 11TH MATERIAL RESPONSE
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
OUTSIDE DIAMETER2.619 INCHES MINIMUM AND 2.659 INCHES MAXIMUM IN
MAJOR THICKNESS0.075 INCHES MINIMUM AND 0.081 INCHES MAXIMUM IN
CASEHARDENING INDICATORNOT CASEHARDENED
RING STYLEINTERNAL INVERTED LUGS
MATERIALSTEEL COMP 1060 OR STEEL COMP 1064 OR STEEL COMP 1065 OR STEEL COMP 1070 OR STEEL COMP 1074 OR STEEL COMP 1078 OR STEEL COMP 1080 OR STEEL COMP 1084 OR STEEL COMP 1085 OR STEEL COMP 1086 OR STEEL COMP 1090
SUBSTITUTES & CROSS-REFERENCES 2
124224Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
5008-243-SReference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Semi-active item — no replacement plannedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 4000-243-ST?
4000-243-ST is a RING,RETAINING.
What parts can replace 4000-243-ST?
There are 2 known substitutes for 4000-243-ST: 124224, 5008-243-S. Substitute compatibility should be verified for your specific system.
What is the NSN for 4000-243-ST?
4000-243-ST is cataloged in the U.S. Government catalog under NSN 5325-01-280-8110. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
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.