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408-SS-20 — SCREW,EXTERNALLY RELIEVED BODY

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

408-SS-20: SCREW,EXTERNALLY RELIEVED BODY.

The SCREW,EXTERNALLY RELIEVED BODY is a the manufacturer industrial component. Key specifications include material: STEEL COMP 303 OVERALL, head_style: KNURLED NO. 4, head_height: 0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN, thread_class: 2A A, head_diameter: 0.312 INCHES MINIMUM AND 0.327 INCHES MAXIMUM IN, thread_length: 0.203 INCHES MINIMUM AND 0.218 INCHES MAXIMUM IN.

This part is cataloged in the U.S. Government catalog under NSN 5305-01-445-4072, 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
408-SS-20
NSN: 5305-01-445-4072
FSC: 5305 — Screws
CAGE: 55566 — MATTHEW WARREN, INC DBA RAF ELECTRONIC HARDWARE DIV RAF ELECTRONIC HARDWARE, LLC (USA)
SPECIFICATIONS
materialSTEEL COMP 303 OVERALL
head_styleKNURLED NO. 4
head_height0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN
thread_class2A A
head_diameter0.312 INCHES MINIMUM AND 0.327 INCHES MAXIMUM IN
thread_length0.203 INCHES MINIMUM AND 0.218 INCHES MAXIMUM IN
fastener_length0.735 INCHES MINIMUM AND 0.765 INCHES MAXIMUM IN
special_featuresITEM MUST COMPLY WITH REQUIREMENTS OF DEFENSE SUPPLY CENTER COLUMBUS PRODUCTION STANDARD NO. LO1505
thread_directionRIGHT-HAND
surface_treatmentPASSIVATE OVERALL
internal_drive_styleSLOT
special_test_featuresSPECIAL QUALITY CONTROL TESTING
NSN5305-01-445-4072
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 408-SS-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
•
HEAD HEIGHT: 0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.735 INCHES MINIMUM AND 0.765 INCHES MAXIMUM IN
•
SPECIAL TEST FEATURES: SPECIAL QUALITY CONTROL TESTING
•
THREAD LENGTH: 0.203 INCHES MINIMUM AND 0.218 INCHES MAXIMUM IN
•
CRITICALITY CODE JUSTIFICATION: ZZZY
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-764 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
FIRST DIAMETER FROM HEAD: 0.115 INCHES MINIMUM AND 0.125 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 0.164 INCHES IN
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN
FASTENER LENGTH0.735 INCHES MINIMUM AND 0.765 INCHES MAXIMUM IN
SPECIAL TEST FEATURESSPECIAL QUALITY CONTROL TESTING
THREAD LENGTH0.203 INCHES MINIMUM AND 0.218 INCHES MAXIMUM IN
CRITICALITY CODE JUSTIFICATIONZZZY
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-764 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
FIRST DIAMETER FROM HEAD0.115 INCHES MINIMUM AND 0.125 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.164 INCHES IN
HEAD STYLEKNURLED NO. 4
THREAD DIRECTIONRIGHT-HAND
OTHER ITEMS IN FSC 5305 — Screws
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5305-00-000-0094 5305-00-000-1397 5305-00-000-2625 5305-00-000-3669 5305-00-000-3830 5305-00-000-3831
SUBSTITUTES & CROSS-REFERENCES 5
LL-HX3-5234Reference document
Same NSN cross-reference
Reference document — Secondary reference
LO1505Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
704-.750-SS-12Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
11-4914-5Reference document
Same NSN cross-reference
Reference document — Secondary reference
PO004454072Reference 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 408-SS-20?
408-SS-20 is a SCREW,EXTERNALLY RELIEVED BODY.
What parts can replace 408-SS-20?
There are 5 known substitutes for 408-SS-20: LL-HX3-5234, LO1505, 704-.750-SS-12 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 408-SS-20?
408-SS-20 is cataloged in the U.S. Government catalog under NSN 5305-01-445-4072. 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.