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Technical Data Sheet
PartsTable / COMPONENT / 4866-B-161
4866-B-161 ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The RING,RETAINING is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-01-577-7388, 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
4866-B-161
NSN: 5325-01-577-7388
FSC: 5325
CAGE: 76364 — MILWAUKEE VALVE CO, INC DIV MILWAUKEE VALVE COMPANY, LLC (USA)
SPECIFICATIONS
Part Number4866-B-161
NSN5325-01-577-7388
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 4866-B-161 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
5399-028R-200Interchangeable
interchangeable cross-reference
interchangeable
5399-028R 2.00INInterchangeable
interchangeable cross-reference
interchangeable
5399-028RInterchangeable
interchangeable cross-reference
interchangeable
5399-028R-1.00IInterchangeable
interchangeable cross-reference
interchangeable
5399-028R 1.00INInterchangeable
interchangeable cross-reference
interchangeable
5399-028R 1/2INInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4866-B-161?
4866-B-161 is a RING,RETAINING.
What parts can replace 4866-B-161?
There are 17 known substitutes for 4866-B-161: 5399-028R-200, 5399-028R 2.00IN, 5399-028R and 14 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4866-B-161?
4866-B-161 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-01-577-7388. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026