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Technical Data Sheet
PartsTable / COMPONENT / 5131-50-S-MD
5131-50-S-MD ✓ 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. Key specifications include material: STEEL, ring_style: E BOWED, usage_design: EXTERNAL, end_play_takeup: 0.031 INCHES MAXIMUM IN, inside_diameter: 0.392 INCHES NOMINAL IN, major_thickness: 0.042 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-664-5389, 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
5131-50-S-MD
NSN: 5325-00-664-5389
FSC: 5325
CAGE: 07382 — ROTOR CLIP COMPANY, INC. (USA)
SPECIFICATIONS
materialSTEEL
ring_styleE BOWED
usage_designEXTERNAL
end_play_takeup0.031 INCHES MAXIMUM IN
inside_diameter0.392 INCHES NOMINAL IN
major_thickness0.042 INCHES NOMINAL IN
surface_treatmentCADMIUM
casehardening_indicatorNOT CASEHARDENED
material_hardness_rating47.0 ROCKWELL C MINIMUM AND 52.0 ROCKWELL C MAXIMUM
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationFED STD NO. 66 FS 1066 TO FS 1090 FED STD SINGLE MATERIAL RESPONSE
NSN5325-00-664-5389
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 5131-50-S-MD · 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
•
END PLAY TAKEUP: 0.031 INCHES MAXIMUM IN
•
MATERIAL: STEEL
•
SURFACE TREATMENT: CADMIUM
•
MATERIAL DOCUMENT AND CLASSIFICATION: FED STD NO. 66 FS 1066 TO FS 1090 FED STD SINGLE MATERIAL RESPONSE
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
MATERIAL HARDNESS RATING: 47.0 ROCKWELL C MINIMUM AND 52.0 ROCKWELL C MAXIMUM
•
INSIDE DIAMETER: 0.392 INCHES NOMINAL IN
•
MAJOR THICKNESS: 0.042 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
END PLAY TAKEUP0.031 INCHES MAXIMUM IN
MATERIALSTEEL
SURFACE TREATMENTCADMIUM
MATERIAL DOCUMENT AND CLASSIFICATIONFED STD NO. 66 FS 1066 TO FS 1090 FED STD SINGLE MATERIAL RESPONSE
CASEHARDENING INDICATORNOT CASEHARDENED
MATERIAL HARDNESS RATING47.0 ROCKWELL C MINIMUM AND 52.0 ROCKWELL C MAXIMUM
INSIDE DIAMETER0.392 INCHES NOMINAL IN
MAJOR THICKNESS0.042 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
USAGE DESIGNEXTERNAL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
MS35295-91Interchangeable
interchangeable cross-reference
interchangeable
FF-S-85Interchangeable
interchangeable cross-reference
interchangeable
179866Interchangeable
interchangeable cross-reference
interchangeable
MS90725-91Interchangeable
interchangeable cross-reference
interchangeable
C4524-661-16Interchangeable
interchangeable cross-reference
interchangeable
5305000429477Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 5131-50-S-MD?
5131-50-S-MD is a RING,RETAINING.
What parts can replace 5131-50-S-MD?
There are 19 known substitutes for 5131-50-S-MD: MS35295-91, FF-S-85, 179866 and 16 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 5131-50-S-MD?
5131-50-S-MD is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-664-5389. This indicates validated use in U.S. government and defense supply chains.
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PartsTable Design LLC · partstable.com
Last verified: July 2026