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Technical Data Sheet
PartsTable / COMPONENT / 221977
221977 ✓ 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 COMP 1035 OVERALL, head_style: HEXAGON, grip_length: 2.438 INCHES NOMINAL IN, head_height: 0.281 INCHES NOMINAL IN, thread_class: 2A A, thread_length: 1.312 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-022-1977, 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
221977
NSN: 5306-00-022-1977
FSC: 5306
CAGE: 21450 — ARMY WEAPONS COMMAND ATTN AMSWE-REE-S (USA)
SPECIFICATIONS
materialSTEEL COMP 1035 OVERALL
head_styleHEXAGON
grip_length2.438 INCHES NOMINAL IN
head_height0.281 INCHES NOMINAL IN
thread_class2A A
thread_length1.312 INCHES MAXIMUM IN
fastener_length3.750 INCHES NOMINAL IN
locking_featureDISTORTIONS BEARING SURFACE OF HEAD
thread_directionRIGHT-HAND
features_providedFINISHED HEAD
surface_treatmentCADMIUM OR ZINC OVERALL
width_between_flats0.625 INCHES NOMINAL IN
NSN5306-00-022-1977
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 221977 · 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: 0.281 INCHES NOMINAL IN
•
THREAD CLASS: 2A A
•
WIDTH BETWEEN FLATS: 0.625 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD SERIES DESIGNATOR: UNF
•
LOCKING FEATURE: DISTORTIONS BEARING SURFACE OF HEAD
•
THREAD LENGTH: 1.312 INCHES MAXIMUM IN
•
THREAD QUANTITY PER INCH: 20
TECHNICAL CHARACTERISTICS (FLIS)
HEAD HEIGHT0.281 INCHES NOMINAL IN
THREAD CLASS2A A
WIDTH BETWEEN FLATS0.625 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
THREAD SERIES DESIGNATORUNF
LOCKING FEATUREDISTORTIONS BEARING SURFACE OF HEAD
THREAD LENGTH1.312 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH20
SURFACE TREATMENTCADMIUM OR ZINC OVERALL
MATERIALSTEEL COMP 1035 OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
4730008371177Interchangeable
interchangeable cross-reference
interchangeable
N-40345-FInterchangeable
interchangeable cross-reference
interchangeable
44Z187D11Interchangeable
interchangeable cross-reference
interchangeable
22206-3Interchangeable
interchangeable cross-reference
interchangeable
70051-1 ITEM 22Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 221977?
221977 is a BOLT,MACHINE.
What parts can replace 221977?
There are 5 known substitutes for 221977: 4730008371177, N-40345-F, 44Z187D11 and 2 more. Substitute compatibility should be verified for your specific system.
Is 221977 still available?
221977 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