PartsTable
Technical Data Sheet
Download PDF

ST3M505-3-18 — SCREW,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

ST3M505-3-18: SCREW,SHOULDER.

The SCREW,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL COMP XM-13 OVERALL, head_style: FLAT COUNTERSUNK, head_height: 0.067 INCHES NOMINAL IN, thread_class: 3A A, head_diameter: 0.338 INCHES MINIMUM AND 0.381 INCHES MAXIMUM IN, thread_length: 0.306 INCHES MINIMUM AND 0.355 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-084-4683, 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
ST3M505-3-18
NSN: 5305-01-084-4683
FSC: 5305 — Screws
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialSTEEL COMP XM-13 OVERALL
head_styleFLAT COUNTERSUNK
head_height0.067 INCHES NOMINAL IN
thread_class3A A
head_diameter0.338 INCHES MINIMUM AND 0.381 INCHES MAXIMUM IN
thread_length0.306 INCHES MINIMUM AND 0.355 INCHES MAXIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length1.441 INCHES MINIMUM AND 1.471 INCHES MAXIMUM IN
shoulder_length1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM FIRST SHOULDER IN
special_featuresINTERNAL HEXAGON SOCKET IN THREADED END 0.0791 IN. MIN AND 0.0806 IN. MAX WIDTH ACROSS FLATS IN
thread_directionRIGHT-HAND
countersink_angle99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
NSN5305-01-084-4683
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: ST3M505-3-18 · 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: 0.067 INCHES NOMINAL IN
•
FASTENER LENGTH: 1.441 INCHES MINIMUM AND 1.471 INCHES MAXIMUM IN
•
SHOULDER LENGTH: 1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM FIRST SHOULDER IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
SHOULDER DIAMETER: 0.2177 INCHES NOMINAL AND 0.2182 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD LENGTH: 0.306 INCHES MINIMUM AND 0.355 INCHES MAXIMUM IN
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.067 INCHES NOMINAL IN
FASTENER LENGTH1.441 INCHES MINIMUM AND 1.471 INCHES MAXIMUM IN
SHOULDER LENGTH1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM FIRST SHOULDER IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
SHOULDER DIAMETER0.2177 INCHES NOMINAL AND 0.2182 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH0.306 INCHES MINIMUM AND 0.355 INCHES MAXIMUM IN
SHOULDER SHAPEROUND FIRST SHOULDER
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.190 INCHES IN
HEAD STYLEFLAT COUNTERSUNK
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 2
HT4009-3-18Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
11917-3-18Same 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
Ready to buy ST3M505-3-18?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is ST3M505-3-18?
ST3M505-3-18 is a SCREW,SHOULDER.
What parts can replace ST3M505-3-18?
There are 2 known substitutes for ST3M505-3-18: HT4009-3-18, 11917-3-18. Substitute compatibility should be verified for your specific system.
What is the NSN for ST3M505-3-18?
ST3M505-3-18 is cataloged in the U.S. Government catalog under NSN 5305-01-084-4683. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — ST3M505-3-18

✓ 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.