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4177608-20 — SCREW,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

4177608-20: SCREW,SHOULDER.

The SCREW,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: FLAT CHAMFER, head_height: 0.610 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 1.287 INCHES MINIMUM AND 1.312 INCHES MAXIMUM IN, thread_length: 0.970 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-203-9347, 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
4177608-20
NSN: 5305-01-203-9347
FSC: 5305 — Screws
CAGE: 05869 — RAYTHEON COMPANY DIV RMD STRATEGIC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleFLAT CHAMFER
head_height0.610 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
thread_class3A A
head_diameter1.287 INCHES MINIMUM AND 1.312 INCHES MAXIMUM IN
thread_length0.970 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length3.465 INCHES MINIMUM AND 3.505 INCHES MAXIMUM IN
hardness_rating32.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL
shoulder_length2.495 INCHES MINIMUM AND 2.505 INCHES MAXIMUM FIRST SHOULDER IN
thread_directionRIGHT-HAND
shoulder_diameter0.996 INCHES MINIMUM AND 0.998 INCHES MAXIMUM FIRST SHOULDER IN
NSN5305-01-203-9347
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 4177608-20 · 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
•
WIDTH ACROSS FLATS: 0.500 INCHES NOMINAL IN
•
HEAD HEIGHT: 0.610 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
•
FASTENER LENGTH: 3.465 INCHES MINIMUM AND 3.505 INCHES MAXIMUM IN
•
SHOULDER LENGTH: 2.495 INCHES MINIMUM AND 2.505 INCHES MAXIMUM FIRST SHOULDER IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY2,CL3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
SHOULDER DIAMETER: 0.996 INCHES MINIMUM AND 0.998 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD LENGTH: 0.970 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.500 INCHES NOMINAL IN
HEAD HEIGHT0.610 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
FASTENER LENGTH3.465 INCHES MINIMUM AND 3.505 INCHES MAXIMUM IN
SHOULDER LENGTH2.495 INCHES MINIMUM AND 2.505 INCHES MAXIMUM FIRST SHOULDER IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY2,CL3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
SHOULDER DIAMETER0.996 INCHES MINIMUM AND 0.998 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH0.970 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN
SHOULDER SHAPEROUND FIRST SHOULDER
HARDNESS RATING32.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL
NOMINAL THREAD DIAMETER0.750 INCHES IN
OTHER ITEMS IN FSC 5305 — Screws
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5305-00-000-0094 5305-00-000-1397 5305-00-000-2625 5305-00-000-3669 5305-00-000-3830 5305-00-000-3831
SUBSTITUTES & CROSS-REFERENCES 2
MS51975-64Reference document
Same NSN cross-reference
Reference document — Secondary reference
MS519757-64Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 4177608-20?
4177608-20 is a SCREW,SHOULDER.
What parts can replace 4177608-20?
There are 2 known substitutes for 4177608-20: MS51975-64, MS519757-64. Substitute compatibility should be verified for your specific system.
What is the NSN for 4177608-20?
4177608-20 is cataloged in the U.S. Government catalog under NSN 5305-01-203-9347. 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.