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5304-18 — RING,RETAINING

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

5304-18: RING,RETAINING.

The RING,RETAINING is a the manufacturer industrial component. Key specifications include ring_style: EXTERNAL, usage_design: EXTERNAL, inside_diameter: 0.137 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN, major_thickness: 0.033 INCHES MINIMUM AND 0.037 INCHES MAXIMUM IN, outside_diameter: 0.400 INCHES NOMINAL IN, casehardening_indicator: NOT CASEHARDENED. This part is cataloged in the U.S.

Government catalog under NSN 5325-01-026-1405, 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
5304-18
NSN: 5325-01-026-1405
FSC: 5325 — Fastening Devices
CAGE: 07382 — ROTOR CLIP COMPANY, INC. (USA)
SPECIFICATIONS
ring_styleEXTERNAL
usage_designEXTERNAL
inside_diameter0.137 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
major_thickness0.033 INCHES MINIMUM AND 0.037 INCHES MAXIMUM IN
outside_diameter0.400 INCHES NOMINAL IN
casehardening_indicatorNOT CASEHARDENED
material_hardness_rating51.0 ROCKWELL C MINIMUM AND 55.0 ROCKWELL C MAXIMUM
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationAISI 1066 OR 1069 OR 1072 OR 1075 ASSN STD ALL MATERIAL RESPONSES OR AISI/SAE 1070 OR 1074 OR 1078 OR 1080 OR 1084 OR 1086 OR 1090 ASSN STD ALL MATERIAL RESPONSES
NSN5325-01-026-1405
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 5304-18 · 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: 51.0 ROCKWELL C MINIMUM AND 55.0 ROCKWELL C MAXIMUM
•
USAGE DESIGN: EXTERNAL
•
MATERIAL DOCUMENT AND CLASSIFICATION: AISI 1066 OR 1069 OR 1072 OR 1075 ASSN STD ALL MATERIAL RESPONSES OR AISI/SAE 1070 OR 1074 OR 1078 OR 1080 OR 1084 OR 1086 OR 1090 ASSN STD ALL MATERIAL RESPONSES
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
OUTSIDE DIAMETER: 0.400 INCHES NOMINAL IN
•
MAJOR THICKNESS: 0.033 INCHES MINIMUM AND 0.037 INCHES MAXIMUM IN
•
INSIDE DIAMETER: 0.137 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
TECHNICAL CHARACTERISTICS
MATERIAL HARDNESS RATING51.0 ROCKWELL C MINIMUM AND 55.0 ROCKWELL C MAXIMUM
USAGE DESIGNEXTERNAL
MATERIAL DOCUMENT AND CLASSIFICATIONAISI 1066 OR 1069 OR 1072 OR 1075 ASSN STD ALL MATERIAL RESPONSES OR AISI/SAE 1070 OR 1074 OR 1078 OR 1080 OR 1084 OR 1086 OR 1090 ASSN STD ALL MATERIAL RESPONSES
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
OUTSIDE DIAMETER0.400 INCHES NOMINAL IN
MAJOR THICKNESS0.033 INCHES MINIMUM AND 0.037 INCHES MAXIMUM IN
INSIDE DIAMETER0.137 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
CASEHARDENING INDICATORNOT CASEHARDENED
RING STYLEEXTERNAL
MATERIALSTEEL COMP 1066 OR STEEL COMP 1069 OR STEEL COMP 1072 OR STEEL COMP 1075 OR STEEL COMP 1070 OR STEEL COMP 1074 OR STEEL COMP 1078 OR STEEL COMP 1080 OR STEEL COMP 1084 OR STEEL COMP 1086 OR STEEL COMP 1090
OTHER ITEMS IN FSC 5325 — Fastening Devices
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5325-00-000-1884 5325-00-000-9988 5325-00-001-1567 5325-00-001-2043 5325-00-001-3842 5325-00-001-3858 5325-00-001-3871 5325-00-001-4317
SUBSTITUTES & CROSS-REFERENCES 1
TTRKM1201Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 5304-18?
5304-18 is a RING,RETAINING.
What parts can replace 5304-18?
There is 1 known substitute for 5304-18: TTRKM1201. Substitute compatibility should be verified for your specific system.
What is the NSN for 5304-18?
5304-18 is cataloged in the U.S. Government catalog under NSN 5325-01-026-1405. 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.