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PartsTable / COMPONENT / R20877
R20877 ✓ 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 BOLT,MACHINE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_type: DRILLED, head_style: HEXAGON, head_height: 0.250 INCHES NOMINAL IN, thread_class: 3A A, hole_diameter: 0.062 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 5306-00-274-0959, 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
R20877
NSN: 5306-00-274-0959
FSC: 5306
CAGE: 83120 — PRESSED METALS OF AMERICA INC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_typeDRILLED
head_styleHEXAGON
head_height0.250 INCHES NOMINAL IN
thread_class3A A
hole_diameter0.062 INCHES NOMINAL IN
hole_quantity2
thread_length0.750 INCHES MINIMUM IN
fastener_length1.000 INCHES NOMINAL IN
hardness_rating30.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
features_providedUNFINISHED HEAD
NSN5306-00-274-0959
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: R20877 · 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
•
HEAD HEIGHT: 0.250 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.375 INCHES IN
•
WIDTH BETWEEN FLATS: 0.562 INCHES NOMINAL IN
•
THREAD LENGTH: 0.750 INCHES MINIMUM IN
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
FASTENER LENGTH: 1.000 INCHES NOMINAL IN
•
HOLE TYPE: DRILLED
•
HEAD STYLE: HEXAGON
TECHNICAL CHARACTERISTICS (FLIS)
HEAD HEIGHT0.250 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.375 INCHES IN
WIDTH BETWEEN FLATS0.562 INCHES NOMINAL IN
THREAD LENGTH0.750 INCHES MINIMUM IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
FASTENER LENGTH1.000 INCHES NOMINAL IN
HOLE TYPEDRILLED
HEAD STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
THREAD QUANTITY PER INCH16
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
A-1-136Interchangeable
interchangeable cross-reference
interchangeable
MIL-I-14652Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-14652BInterchangeable
interchangeable cross-reference
interchangeable
A1805J192Interchangeable
interchangeable cross-reference
interchangeable
100115R91Interchangeable
interchangeable cross-reference
interchangeable
A1085J192Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is R20877?
R20877 is a BOLT,MACHINE.
What parts can replace R20877?
There are 18 known substitutes for R20877: A-1-136, MIL-I-14652, MIL-DTL-14652B and 15 more. Substitute compatibility should be verified for your specific system.
What is the NSN for R20877?
R20877 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-274-0959. 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