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5101-100-S-MD — RING,RETAINING

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

5101-100-S-MD: RING,RETAINING.

The RING,RETAINING is a the manufacturer industrial component. Key specifications include material: STEEL, ring_style: EXTERNAL BOWED, usage_design: EXTERNAL, end_play_takeup: 0.020 INCHES MAXIMUM IN, inside_diameter: 0.915 INCHES MINIMUM AND 0.930 INCHES MAXIMUM IN, major_thickness: 0.040 INCHES MINIMUM AND 0.044 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5325-00-256-2863, 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
5101-100-S-MD
NSN: 5325-00-256-2863
FSC: 5325 — Fastening Devices
CAGE: 07382 — ROTOR CLIP COMPANY, INC. (USA)
SPECIFICATIONS
materialSTEEL
ring_styleEXTERNAL BOWED
usage_designEXTERNAL
end_play_takeup0.020 INCHES MAXIMUM IN
inside_diameter0.915 INCHES MINIMUM AND 0.930 INCHES MAXIMUM IN
major_thickness0.040 INCHES MINIMUM AND 0.044 INCHES MAXIMUM IN
surface_treatmentCADMIUM AND CHROMATE
casehardening_indicatorNOT CASEHARDENED
material_hardness_rating66.0 ROCKWELL SUPERFICIAL 30-N MINIMUM AND 71.0 ROCKWELL SUPERFICIAL 30-N MAXIMUM
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationFED STD 66,COMPOSITION 1060 THRU 1090 FED STD SINGLE MATERIAL RESPONSE
NSN5325-00-256-2863
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 5101-100-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
•
MATERIAL HARDNESS RATING: 66.0 ROCKWELL SUPERFICIAL 30-N MINIMUM AND 71.0 ROCKWELL SUPERFICIAL 30-N MAXIMUM
•
USAGE DESIGN: EXTERNAL
•
MATERIAL DOCUMENT AND CLASSIFICATION: FED STD 66,COMPOSITION 1060 THRU 1090 FED STD SINGLE MATERIAL RESPONSE
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
END PLAY TAKEUP: 0.020 INCHES MAXIMUM IN
•
MAJOR THICKNESS: 0.040 INCHES MINIMUM AND 0.044 INCHES MAXIMUM IN
•
INSIDE DIAMETER: 0.915 INCHES MINIMUM AND 0.930 INCHES MAXIMUM IN
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
TECHNICAL CHARACTERISTICS
MATERIAL HARDNESS RATING66.0 ROCKWELL SUPERFICIAL 30-N MINIMUM AND 71.0 ROCKWELL SUPERFICIAL 30-N MAXIMUM
USAGE DESIGNEXTERNAL
MATERIAL DOCUMENT AND CLASSIFICATIONFED STD 66,COMPOSITION 1060 THRU 1090 FED STD SINGLE MATERIAL RESPONSE
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
END PLAY TAKEUP0.020 INCHES MAXIMUM IN
MAJOR THICKNESS0.040 INCHES MINIMUM AND 0.044 INCHES MAXIMUM IN
INSIDE DIAMETER0.915 INCHES MINIMUM AND 0.930 INCHES MAXIMUM IN
CASEHARDENING INDICATORNOT CASEHARDENED
RING STYLEEXTERNAL BOWED
SURFACE TREATMENTCADMIUM AND CHROMATE
SUBSTITUTES & CROSS-REFERENCES 5
3101-112-ST-CDReference document
Same NSN cross-reference
Reference document — Secondary reference
MS16628-100Reference document
Same NSN cross-reference
Reference document — Replaced / superseded reference
51-01108Reference document
Same NSN cross-reference
Reference document — Replaced / superseded reference
MIL-R-21248BReference document
Same NSN cross-reference
Reference document — Replaced / superseded reference
MS16628-1100Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 5101-100-S-MD?
5101-100-S-MD is a RING,RETAINING.
What parts can replace 5101-100-S-MD?
There are 5 known substitutes for 5101-100-S-MD: 3101-112-ST-CD, MS16628-100, 51-01108 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 5101-100-S-MD?
5101-100-S-MD is cataloged in the U.S. Government catalog under NSN 5325-00-256-2863. 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.