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401608-87 — RING,RETAINING

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

401608-87: RING,RETAINING.

The RING,RETAINING is a the manufacturer industrial component. Key specifications include material: STEEL, ring_style: SPECIAL FLAT, usage_design: INTERNAL, inside_diameter: 0.839 INCHES MINIMUM AND 0.860 INCHES MAXIMUM IN, major_thickness: 0.029 INCHES MINIMUM AND 0.033 INCHES MAXIMUM IN, strength_rating: ERR-060. This part is cataloged in the U.S.

Government catalog under NSN 5325-00-952-0528, 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
401608-87
NSN: 5325-00-952-0528
FSC: 5325 — Fastening Devices
CAGE: 02145 — RICHARDS IMAGERY INTERPRETATION SYSTEMS, L.L.C. (USA)
SPECIFICATIONS
materialSTEEL
ring_styleSPECIAL FLAT
usage_designINTERNAL
inside_diameter0.839 INCHES MINIMUM AND 0.860 INCHES MAXIMUM IN
major_thickness0.029 INCHES MINIMUM AND 0.033 INCHES MAXIMUM IN
strength_ratingERR-060
outside_diameter0.922 INCHES MINIMUM AND 0.935 INCHES MAXIMUM IN
casehardening_indicatorNOT CASEHARDENED
material_hardness_rating71.0 ROCKWELL A MINIMUM AND 77.5 ROCKWELL A MAXIMUM
cross-sectional_shape_styleDOUBLE OVAL
material_document_and_classificationFED STD NO. 66,AISI C1070 THRU C1090 FED STD SINGLE MATERIAL RESPONSE OR SAE 1070 THRU 1090 ASSN STD SINGLE MATERIAL RESPONSE
NSN5325-00-952-0528
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 401608-87 · 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: 71.0 ROCKWELL A MINIMUM AND 77.5 ROCKWELL A MAXIMUM
•
USAGE DESIGN: INTERNAL
•
STRENGTH RATING: ERR-060
•
MATERIAL DOCUMENT AND CLASSIFICATION: FED STD NO. 66,AISI C1070 THRU C1090 FED STD SINGLE MATERIAL RESPONSE OR SAE 1070 THRU 1090 ASSN STD SINGLE MATERIAL RESPONSE
•
CROSS-SECTIONAL SHAPE STYLE: DOUBLE OVAL
•
OUTSIDE DIAMETER: 0.922 INCHES MINIMUM AND 0.935 INCHES MAXIMUM IN
•
MAJOR THICKNESS: 0.029 INCHES MINIMUM AND 0.033 INCHES MAXIMUM IN
•
INSIDE DIAMETER: 0.839 INCHES MINIMUM AND 0.860 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
MATERIAL HARDNESS RATING71.0 ROCKWELL A MINIMUM AND 77.5 ROCKWELL A MAXIMUM
USAGE DESIGNINTERNAL
STRENGTH RATINGERR-060
MATERIAL DOCUMENT AND CLASSIFICATIONFED STD NO. 66,AISI C1070 THRU C1090 FED STD SINGLE MATERIAL RESPONSE OR SAE 1070 THRU 1090 ASSN STD SINGLE MATERIAL RESPONSE
CROSS-SECTIONAL SHAPE STYLEDOUBLE OVAL
OUTSIDE DIAMETER0.922 INCHES MINIMUM AND 0.935 INCHES MAXIMUM IN
MAJOR THICKNESS0.029 INCHES MINIMUM AND 0.033 INCHES MAXIMUM IN
INSIDE DIAMETER0.839 INCHES MINIMUM AND 0.860 INCHES MAXIMUM IN
CASEHARDENING INDICATORNOT CASEHARDENED
RING STYLESPECIAL FLAT
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 5
AL-773-8Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
RR-87KReference document
Same NSN cross-reference
Reference document — Secondary reference
MIL-DTL-27426Reference document
Same NSN cross-reference
Reference document — Identification reference
M2742630115ASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
WH-87Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — no further procurement; issued until stock is exhaustedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 401608-87?
401608-87 is a RING,RETAINING.
What parts can replace 401608-87?
There are 5 known substitutes for 401608-87: AL-773-8, RR-87K, MIL-DTL-27426 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 401608-87?
401608-87 is cataloged in the U.S. Government catalog under NSN 5325-00-952-0528. 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.