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177A220-106 — SCREW,CLOSE TOLERANCE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

177A220-106: SCREW,CLOSE TOLERANCE.

The SCREW,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: STEEL COMP 305 OR STEEL COMP 316 OR STEEL COMP 321 OR STEEL COMP 347 OVERALL, head_style: FLAT CHAMFER, grip_length: 0.940 INCHES NOMINAL IN, head_height: 0.495 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN, thread_class: 2A A, grip_diameter: 0.4995 INCHES MINIMUM AND 0.5000 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-265-1193, 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
177A220-106
NSN: 5305-01-265-1193
FSC: 5305 — Screws
CAGE: 17454 — TIMKEN GEARS & SERVICES INC. DIV PHILADELPHIA GEAR (USA)
SPECIFICATIONS
materialSTEEL COMP 305 OR STEEL COMP 316 OR STEEL COMP 321 OR STEEL COMP 347 OVERALL
head_styleFLAT CHAMFER
grip_length0.940 INCHES NOMINAL IN
head_height0.495 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
thread_class2A A
grip_diameter0.4995 INCHES MINIMUM AND 0.5000 INCHES MAXIMUM IN
head_diameter0.870 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN
thread_length0.500 INCHES NOMINAL IN
surface_finish16.0 MICROINCHES GRIP
fastener_length1.500 INCHES NOMINAL IN
hardness_rating25.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
NSN5305-01-265-1193
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 177A220-106 · 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
•
SURFACE FINISH: 16.0 MICROINCHES GRIP
•
WIDTH ACROSS FLATS: 0.375 INCHES MINIMUM AND 0.383 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.495 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
•
FASTENER LENGTH: 1.500 INCHES NOMINAL IN
•
THREAD LENGTH: 0.500 INCHES NOMINAL IN
•
HARDNESS RATING: 25.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASME SA193 ASSN STD ALL MATERIAL RESPONSES OVERALL
•
NOMINAL THREAD DIAMETER: 0.500 INCHES IN
TECHNICAL CHARACTERISTICS
SURFACE FINISH16.0 MICROINCHES GRIP
WIDTH ACROSS FLATS0.375 INCHES MINIMUM AND 0.383 INCHES MAXIMUM IN
HEAD HEIGHT0.495 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
FASTENER LENGTH1.500 INCHES NOMINAL IN
THREAD LENGTH0.500 INCHES NOMINAL IN
HARDNESS RATING25.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONASME SA193 ASSN STD ALL MATERIAL RESPONSES OVERALL
NOMINAL THREAD DIAMETER0.500 INCHES IN
HEAD STYLEFLAT CHAMFER
THREAD DIRECTIONRIGHT-HAND
OTHER ITEMS IN FSC 5305 — Screws
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5305-00-001-5016 5305-00-001-9160 5305-00-001-9629 5305-00-001-9742 5305-00-001-9768 5305-00-003-4306 5305-00-003-6694 5305-00-003-6753
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 177A220-106?
177A220-106 is a SCREW,CLOSE TOLERANCE.
What is the NSN for 177A220-106?
177A220-106 is cataloged in the U.S. Government catalog under NSN 5305-01-265-1193. 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.