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Technical Data Sheet
PartsTable / COMPONENT / 42R2051-80
42R2051-80 ✓ 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: EXTERNAL, usage_design: EXTERNAL, inside_diameter: 0.611 INCHES MINIMUM AND 0.626 INCHES MAXIMUM IN, major_thickness: 0.033 INCHES MINIMUM AND 0.037 INCHES MAXIMUM IN, surface_treatment: ZINC. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-282-6956, 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
42R2051-80
NSN: 5325-00-282-6956
FSC: 5325
CAGE: 10001 — NAVAIR AND NAVSEA MANAGED ORIGINAL DESIGN ACTIVITY DWG NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
materialSTEEL
ring_styleEXTERNAL
usage_designEXTERNAL
inside_diameter0.611 INCHES MINIMUM AND 0.626 INCHES MAXIMUM IN
major_thickness0.033 INCHES MINIMUM AND 0.037 INCHES MAXIMUM IN
surface_treatmentZINC
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,FS1066 TO 1090 FED STD SINGLE MATERIAL RESPONSE
NSN5325-00-282-6956
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 42R2051-80 · 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
•
MAJOR THICKNESS: 0.033 INCHES MINIMUM AND 0.037 INCHES MAXIMUM IN
•
INSIDE DIAMETER: 0.611 INCHES MINIMUM AND 0.626 INCHES MAXIMUM IN
•
MATERIAL: STEEL
•
SURFACE TREATMENT: ZINC
•
MATERIAL DOCUMENT AND CLASSIFICATION: FED STD 66,FS1066 TO 1090 FED STD SINGLE MATERIAL RESPONSE
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
MATERIAL HARDNESS RATING: 66.0 ROCKWELL SUPERFICIAL 30-N MINIMUM AND 71.0 ROCKWELL SUPERFICIAL 30-N MAXIMUM
•
RING STYLE: EXTERNAL
TECHNICAL CHARACTERISTICS (FLIS)
MAJOR THICKNESS0.033 INCHES MINIMUM AND 0.037 INCHES MAXIMUM IN
INSIDE DIAMETER0.611 INCHES MINIMUM AND 0.626 INCHES MAXIMUM IN
MATERIALSTEEL
SURFACE TREATMENTZINC
MATERIAL DOCUMENT AND CLASSIFICATIONFED STD 66,FS1066 TO 1090 FED STD SINGLE MATERIAL RESPONSE
CASEHARDENING INDICATORNOT CASEHARDENED
MATERIAL HARDNESS RATING66.0 ROCKWELL SUPERFICIAL 30-N MINIMUM AND 71.0 ROCKWELL SUPERFICIAL 30-N MAXIMUM
RING STYLEEXTERNAL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
USAGE DESIGNEXTERNAL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
5100-66-S-MDInterchangeable
interchangeable cross-reference
interchangeable
92588-66Interchangeable
interchangeable cross-reference
interchangeable
4060001066Interchangeable
interchangeable cross-reference
interchangeable
5100-66ZDInterchangeable
Same NIIN cross-reference
interchangeable
MS16624-2066Interchangeable
Same NIIN cross-reference
interchangeable
MIL-DTL-21248Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 42R2051-80?
42R2051-80 is a RING,RETAINING.
What parts can replace 42R2051-80?
There are 6 known substitutes for 42R2051-80: 5100-66-S-MD, 92588-66, 4060001066 and 3 more. Substitute compatibility should be verified for your specific system.
Is 42R2051-80 still available?
42R2051-80 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026