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8644790-62 — SCREW,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

8644790-62: 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 0.635 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 1.287 INCHES MINIMUM AND 1.312 INCHES MAXIMUM IN, thread_length: 0.820 INCHES MINIMUM AND 0.880 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-285-5980, 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
8644790-62
NSN: 5305-01-285-5980
FSC: 5305 — Screws
CAGE: 56672 — SYN-TECH SYSTEM, INC. (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleFLAT CHAMFER
head_height0.610 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN
thread_class3A A
head_diameter1.287 INCHES MINIMUM AND 1.312 INCHES MAXIMUM IN
thread_length0.820 INCHES MINIMUM AND 0.880 INCHES MAXIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length2.830 INCHES MINIMUM AND 2.870 INCHES MAXIMUM IN
shoulder_length1.990 INCHES MINIMUM AND 2.010 INCHES MAXIMUM FIRST SHOULDER IN
special_featuresPLAIN OR KNURL HEAD; NECK BETWEEN SHOULDER AND THREADS 0.150 LG.; 0.605-0.638 DIA
thread_directionRIGHT-HAND
shoulder_diameter0.996 INCHES MINIMUM AND 0.998 INCHES MAXIMUM FIRST SHOULDER IN
NSN5305-01-285-5980
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 8644790-62 · 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: 0.503 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.610 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN
•
FASTENER LENGTH: 2.830 INCHES MINIMUM AND 2.870 INCHES MAXIMUM IN
•
SHOULDER LENGTH: 1.990 INCHES MINIMUM AND 2.010 INCHES MAXIMUM FIRST SHOULDER IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416 TY 2 CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
SHOULDER DIAMETER: 0.996 INCHES MINIMUM AND 0.998 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD LENGTH: 0.820 INCHES MINIMUM AND 0.880 INCHES MAXIMUM IN
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.503 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN
HEAD HEIGHT0.610 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN
FASTENER LENGTH2.830 INCHES MINIMUM AND 2.870 INCHES MAXIMUM IN
SHOULDER LENGTH1.990 INCHES MINIMUM AND 2.010 INCHES MAXIMUM FIRST SHOULDER IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416 TY 2 CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
SHOULDER DIAMETER0.996 INCHES MINIMUM AND 0.998 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH0.820 INCHES MINIMUM AND 0.880 INCHES MAXIMUM IN
SHOULDER SHAPEROUND FIRST SHOULDER
SINGLE SHEAR STRENGTHERR-060
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.
5305-00-001-5016 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 1
MS51975-62Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 8644790-62?
8644790-62 is a SCREW,SHOULDER.
What parts can replace 8644790-62?
There is 1 known substitute for 8644790-62: MS51975-62. Substitute compatibility should be verified for your specific system.
What is the NSN for 8644790-62?
8644790-62 is cataloged in the U.S. Government catalog under NSN 5305-01-285-5980. This indicates validated use in U.S. government and defense supply chains.
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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.