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MS16631-2218 — RING,RETAINING

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

MS16631-2218: RING,RETAINING.

The RING,RETAINING is a the manufacturer industrial component. Key specifications include material: STEEL, ring_style: INTERNAL, usage_design: INTERNAL, major_thickness: 0.075 INCHES MINIMUM AND 0.081 INCHES MAXIMUM IN, minor_thickness: 0.0575 INCHES MINIMUM AND 0.0605 INCHES MAXIMUM IN, outside_diameter: 2.385 INCHES MINIMUM AND 2.455 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5325-00-256-2857, 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
MS16631-2218
NSN: 5325-00-256-2857
NIINs: 002562857, 015260993
FSC: 5325 — Fastening Devices
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL
ring_styleINTERNAL
usage_designINTERNAL
major_thickness0.075 INCHES MINIMUM AND 0.081 INCHES MAXIMUM IN
minor_thickness0.0575 INCHES MINIMUM AND 0.0605 INCHES MAXIMUM IN
outside_diameter2.385 INCHES MINIMUM AND 2.455 INCHES MAXIMUM IN
surface_treatmentCADMIUM AND CHROMATE
casehardening_indicatorNOT CASEHARDENED
material_hardness_rating47.0 ROCKWELL C MINIMUM AND 52.0 ROCKWELL C MAXIMUM
cross-sectional_shape_styleBEVELED ONE OUTSIDE CORNER
material_document_and_classificationFED STD 66,1066 TO 1090 FED STD SINGLE MATERIAL RESPONSE
NSN5325-00-256-2857
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MS16631-2218 · 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
•
MINOR THICKNESS: 0.0575 INCHES MINIMUM AND 0.0605 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: FED STD 66,1066 TO 1090 FED STD SINGLE MATERIAL RESPONSE
•
CROSS-SECTIONAL SHAPE STYLE: BEVELED ONE OUTSIDE CORNER
•
OUTSIDE DIAMETER: 2.385 INCHES MINIMUM AND 2.455 INCHES MAXIMUM IN
•
MAJOR THICKNESS: 0.075 INCHES MINIMUM AND 0.081 INCHES MAXIMUM IN
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
TECHNICAL CHARACTERISTICS
MATERIAL HARDNESS RATING47.0 ROCKWELL C MINIMUM AND 52.0 ROCKWELL C MAXIMUM
USAGE DESIGNINTERNAL
MINOR THICKNESS0.0575 INCHES MINIMUM AND 0.0605 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONFED STD 66,1066 TO 1090 FED STD SINGLE MATERIAL RESPONSE
CROSS-SECTIONAL SHAPE STYLEBEVELED ONE OUTSIDE CORNER
OUTSIDE DIAMETER2.385 INCHES MINIMUM AND 2.455 INCHES MAXIMUM IN
MAJOR THICKNESS0.075 INCHES MINIMUM AND 0.081 INCHES MAXIMUM IN
CASEHARDENING INDICATORNOT CASEHARDENED
RING STYLEINTERNAL
SURFACE TREATMENTCADMIUM AND CHROMATE
SUBSTITUTES & CROSS-REFERENCES 2
N5002-218MDReference document
Same NSN cross-reference
Reference document — Secondary reference
MS16631-1218Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is MS16631-2218?
MS16631-2218 is a RING,RETAINING.
What parts can replace MS16631-2218?
There are 2 known substitutes for MS16631-2218: N5002-218MD, MS16631-1218. Substitute compatibility should be verified for your specific system.
What is the NSN for MS16631-2218?
MS16631-2218 is cataloged in the U.S. Government catalog under NSN 5325-00-256-2857. This indicates validated use in U.S. government and defense supply chains.
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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.