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CA18163 — RING,RETAINING

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

CA18163: RING,RETAINING.

The RING,RETAINING is a the manufacturer industrial component. Key specifications include material: COBALT ALLOY AND STEEL COMP 301, usage_design: EXTERNAL, inside_diameter: 0.187 INCHES NOMINAL IN, casehardening_indicator: NOT CASEHARDENED, material_hardness_rating: 45.0 ROCKWELL C MINIMUM, material_document_and_classification: MIL-S-5059, TYPE 301, 1/4 HARD MIL SPEC 2ND MATERIAL RESPONSE. This part is cataloged in the U.S.

Government catalog under NSN 5325-01-020-3873, 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
CA18163
NSN: 5325-01-020-3873
FSC: 5325 — Fastening Devices
CAGE: 29372 — HOWMET GLOBAL FASTENING SYSTEMS INC. DIV TRIDAIR PRODUCTS (USA)
SPECIFICATIONS
materialCOBALT ALLOY AND STEEL COMP 301
usage_designEXTERNAL
inside_diameter0.187 INCHES NOMINAL IN
casehardening_indicatorNOT CASEHARDENED
material_hardness_rating45.0 ROCKWELL C MINIMUM
material_document_and_classificationMIL-S-5059, TYPE 301, 1/4 HARD MIL SPEC 2ND MATERIAL RESPONSE
NSN5325-01-020-3873
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: CA18163 · 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: 45.0 ROCKWELL C MINIMUM
•
USAGE DESIGN: EXTERNAL
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-5059, TYPE 301, 1/4 HARD MIL SPEC 2ND MATERIAL RESPONSE
•
INSIDE DIAMETER: 0.187 INCHES NOMINAL IN
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
MATERIAL: COBALT ALLOY AND STEEL COMP 301
TECHNICAL CHARACTERISTICS
MATERIAL HARDNESS RATING45.0 ROCKWELL C MINIMUM
USAGE DESIGNEXTERNAL
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-5059, TYPE 301, 1/4 HARD MIL SPEC 2ND MATERIAL RESPONSE
INSIDE DIAMETER0.187 INCHES NOMINAL IN
CASEHARDENING INDICATORNOT CASEHARDENED
MATERIALCOBALT ALLOY AND STEEL COMP 301
SUBSTITUTES & CROSS-REFERENCES 1
MIL-STD-130KReference 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 CA18163?
CA18163 is a RING,RETAINING.
What parts can replace CA18163?
There is 1 known substitute for CA18163: MIL-STD-130K. Substitute compatibility should be verified for your specific system.
What is the NSN for CA18163?
CA18163 is cataloged in the U.S. Government catalog under NSN 5325-01-020-3873. 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.