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ST3M495-4-20-1 — SCREW,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

ST3M495-4-20-1: SCREW,SHOULDER.

The SCREW,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL COMP XM-13 OVERALL, head_style: FILLISTER COUNTERSUNK, head_height: 0.015 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 0.3898 INCHES MINIMUM AND 0.3948 INCHES MAXIMUM IN, thread_length: 0.372 INCHES MINIMUM AND 0.422 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-209-9372, 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
ST3M495-4-20-1
NSN: 5305-01-209-9372
FSC: 5305 — Screws
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialSTEEL COMP XM-13 OVERALL
head_styleFILLISTER COUNTERSUNK
head_height0.015 INCHES MAXIMUM IN
thread_class3A A
head_diameter0.3898 INCHES MINIMUM AND 0.3948 INCHES MAXIMUM IN
thread_length0.372 INCHES MINIMUM AND 0.422 INCHES MAXIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length1.632 INCHES MINIMUM AND 1.662 INCHES MAXIMUM IN
shoulder_length1.183 INCHES MINIMUM AND 1.211 INCHES MAXIMUM FIRST SHOULDER IN
special_featuresHEX HOLE IN THREADED END 0.095 MIN AND 0.097 MAX
thread_directionRIGHT-HAND
countersink_angle99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
NSN5305-01-209-9372
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: ST3M495-4-20-1 · 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: 0.015 INCHES MAXIMUM IN
•
FASTENER LENGTH: 1.632 INCHES MINIMUM AND 1.662 INCHES MAXIMUM IN
•
SHOULDER LENGTH: 1.183 INCHES MINIMUM AND 1.211 INCHES MAXIMUM FIRST SHOULDER IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
SHOULDER DIAMETER: 0.2646 INCHES MINIMUM AND 0.2651 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD LENGTH: 0.372 INCHES MINIMUM AND 0.422 INCHES MAXIMUM IN
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.015 INCHES MAXIMUM IN
FASTENER LENGTH1.632 INCHES MINIMUM AND 1.662 INCHES MAXIMUM IN
SHOULDER LENGTH1.183 INCHES MINIMUM AND 1.211 INCHES MAXIMUM FIRST SHOULDER IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
SHOULDER DIAMETER0.2646 INCHES MINIMUM AND 0.2651 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH0.372 INCHES MINIMUM AND 0.422 INCHES MAXIMUM IN
SHOULDER SHAPEROUND FIRST SHOULDER
MATERIAL DOCUMENT AND CLASSIFICATIONAMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.250 INCHES IN
HEAD STYLEFILLISTER COUNTERSUNK
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
HT4016-4-20XSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
11911-4-20-1Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 ST3M495-4-20-1?
ST3M495-4-20-1 is a SCREW,SHOULDER.
What parts can replace ST3M495-4-20-1?
There are 2 known substitutes for ST3M495-4-20-1: HT4016-4-20X, 11911-4-20-1. Substitute compatibility should be verified for your specific system.
What is the NSN for ST3M495-4-20-1?
ST3M495-4-20-1 is cataloged in the U.S. Government catalog under NSN 5305-01-209-9372. 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.