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9M187-181 — RING,RETAINING

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

9M187-181: RING,RETAINING.

The RING,RETAINING is a the manufacturer industrial component. Key specifications include ring_style: SPIRAL, usage_design: EXTERNAL, inside_diameter: 1.694 INCHES MINIMUM AND 1.714 INCHES MAXIMUM IN, major_thickness: 0.059 INCHES MINIMUM AND 0.065 INCHES MAXIMUM IN, strength_rating: ERR-060, outside_diameter: 1.940 INCHES MINIMUM AND 1.960 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5325-01-147-0059, 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
9M187-181
NSN: 5325-01-147-0059
FSC: 5325 — Fastening Devices
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialSTEEL COMP 1070 OR STEEL COMP 1572 OR STEEL COMP 1074 OR STEEL COMP 1075 OR STEEL COMP 1078 OR STEEL COMP 1080 OR STEEL COMP 1085 OR STEEL COMP 1086 OR STEEL COMP 1090
ring_styleSPIRAL
usage_designEXTERNAL
inside_diameter1.694 INCHES MINIMUM AND 1.714 INCHES MAXIMUM IN
major_thickness0.059 INCHES MINIMUM AND 0.065 INCHES MAXIMUM IN
strength_ratingERR-060
outside_diameter1.940 INCHES MINIMUM AND 1.960 INCHES MAXIMUM IN
surface_treatmentCADMIUM AND CHROMATE
casehardening_indicatorNOT CASEHARDENED
cross-sectional_shape_styleDOUBLE OVAL
surface_treatment_document_and_classificationQQ-P-416, TYPE 2, CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE
NSN5325-01-147-0059
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 9M187-181 · 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
•
USAGE DESIGN: EXTERNAL
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416, TYPE 2, CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE
•
STRENGTH RATING: ERR-060
•
MATERIAL DOCUMENT AND CLASSIFICATION: FED STD 66, COMP 1070 FED STD 1ST MATERIAL RESPONSE AND FED STD 66, COMP 1072 FED STD 2ND MATERIAL RESPONSE AND FED STD 66, COMP 1074 FED STD 3RD MATERIAL RESPONSE AND FED STD 66, COMP 1075 FED STD 4TH MATERIAL RESPONSE AND FED STD 66, COMP 1078 FED STD 5TH MATERIAL RESPONSE AND FED STD 66, COMP 1080 FED STD 6TH MATERIAL RESPONSE AND FED STD 66, COMP 1084 FED STD 7TH MATERIAL RESPONSE AND FED STD 66, COMP 1085 FED STD 8TH MATERIAL RESPONSE AND FED STD 66, COMP 1086 FED STD 9TH MATERIAL RESPONSE AND FED STD 66, COMP 1090 FED STD 10TH MATERIAL RESPONSE
•
CROSS-SECTIONAL SHAPE STYLE: DOUBLE OVAL
•
OUTSIDE DIAMETER: 1.940 INCHES MINIMUM AND 1.960 INCHES MAXIMUM IN
•
MAJOR THICKNESS: 0.059 INCHES MINIMUM AND 0.065 INCHES MAXIMUM IN
•
INSIDE DIAMETER: 1.694 INCHES MINIMUM AND 1.714 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
USAGE DESIGNEXTERNAL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416, TYPE 2, CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE
STRENGTH RATINGERR-060
MATERIAL DOCUMENT AND CLASSIFICATIONFED STD 66, COMP 1070 FED STD 1ST MATERIAL RESPONSE AND FED STD 66, COMP 1072 FED STD 2ND MATERIAL RESPONSE AND FED STD 66, COMP 1074 FED STD 3RD MATERIAL RESPONSE AND FED STD 66, COMP 1075 FED STD 4TH MATERIAL RESPONSE AND FED STD 66, COMP 1078 FED STD 5TH MATERIAL RESPONSE AND FED STD 66, COMP 1080 FED STD 6TH MATERIAL RESPONSE AND FED STD 66, COMP 1084 FED STD 7TH MATERIAL RESPONSE AND FED STD 66, COMP 1085 FED STD 8TH MATERIAL RESPONSE AND FED STD 66, COMP 1086 FED STD 9TH MATERIAL RESPONSE AND FED STD 66, COMP 1090 FED STD 10TH MATERIAL RESPONSE
CROSS-SECTIONAL SHAPE STYLEDOUBLE OVAL
OUTSIDE DIAMETER1.940 INCHES MINIMUM AND 1.960 INCHES MAXIMUM IN
MAJOR THICKNESS0.059 INCHES MINIMUM AND 0.065 INCHES MAXIMUM IN
INSIDE DIAMETER1.694 INCHES MINIMUM AND 1.714 INCHES MAXIMUM IN
CASEHARDENING INDICATORNOT CASEHARDENED
RING STYLESPIRAL
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 2
RST-181-CReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
RST-181-CD-M9Reference 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 9M187-181?
9M187-181 is a RING,RETAINING.
What parts can replace 9M187-181?
There are 2 known substitutes for 9M187-181: RST-181-C, RST-181-CD-M9. Substitute compatibility should be verified for your specific system.
What is the NSN for 9M187-181?
9M187-181 is cataloged in the U.S. Government catalog under NSN 5325-01-147-0059. 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.