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GS551C06-399 — SCREW,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

GS551C06-399: SCREW,SHOULDER.

The SCREW,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4037 OR STEEL COMP 8740 OVERALL, head_style: FLAT COUNTERSUNK, thread_class: 2A A, head_diameter: 0.223 INCHES NOMINAL IN, thread_length: 0.188 INCHES MINIMUM AND 0.248 INCHES MAXIMUM IN, shoulder_shape: ROUND FIRST SHOULDER. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-313-9331, 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
GS551C06-399
NSN: 5305-01-313-9331
FSC: 5305 — Screws
CAGE: 58845 — ABOUNDING SECURITY INC DIV OF MAA CORP (USA)
SPECIFICATIONS
materialSTEEL COMP 4037 OR STEEL COMP 8740 OVERALL
head_styleFLAT COUNTERSUNK
thread_class2A A
head_diameter0.223 INCHES NOMINAL IN
thread_length0.188 INCHES MINIMUM AND 0.248 INCHES MAXIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length0.563 INCHES MINIMUM AND 0.593 INCHES MAXIMUM IN
hardness_rating33.0 ROCKWELL C MINIMUM AND 37.0 ROCKWELL C MAXIMUM OVERALL
shoulder_length0.305 INCHES MINIMUM AND 0.375 INCHES MAXIMUM FIRST SHOULDER IN
thread_directionRIGHT-HAND
countersink_angle100.0 DEGREES NOMINAL
shoulder_diameter0.141 INCHES MINIMUM AND 0.142 INCHES MAXIMUM FIRST SHOULDER IN
NSN5305-01-313-9331
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: GS551C06-399 · 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
•
FASTENER LENGTH: 0.563 INCHES MINIMUM AND 0.593 INCHES MAXIMUM IN
•
SHOULDER LENGTH: 0.305 INCHES MINIMUM AND 0.375 INCHES MAXIMUM FIRST SHOULDER IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2 CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
SHOULDER DIAMETER: 0.141 INCHES MINIMUM AND 0.142 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD LENGTH: 0.188 INCHES MINIMUM AND 0.248 INCHES MAXIMUM IN
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
•
HARDNESS RATING: 33.0 ROCKWELL C MINIMUM AND 37.0 ROCKWELL C MAXIMUM OVERALL
•
NOMINAL THREAD DIAMETER: 0.138 INCHES IN
TECHNICAL CHARACTERISTICS
FASTENER LENGTH0.563 INCHES MINIMUM AND 0.593 INCHES MAXIMUM IN
SHOULDER LENGTH0.305 INCHES MINIMUM AND 0.375 INCHES MAXIMUM FIRST SHOULDER IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2 CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
SHOULDER DIAMETER0.141 INCHES MINIMUM AND 0.142 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH0.188 INCHES MINIMUM AND 0.248 INCHES MAXIMUM IN
SHOULDER SHAPEROUND FIRST SHOULDER
HARDNESS RATING33.0 ROCKWELL C MINIMUM AND 37.0 ROCKWELL C MAXIMUM OVERALL
NOMINAL THREAD DIAMETER0.138 INCHES IN
HEAD STYLEFLAT COUNTERSUNK
THREAD DIRECTIONRIGHT-HAND
OTHER ITEMS IN FSC 5305 — Screws
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5305-00-001-5016 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
BM19069-06-399Reference document
Same NSN cross-reference
Reference document — Secondary reference
2R1861-8Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 GS551C06-399?
GS551C06-399 is a SCREW,SHOULDER.
What parts can replace GS551C06-399?
There are 2 known substitutes for GS551C06-399: BM19069-06-399, 2R1861-8. Substitute compatibility should be verified for your specific system.
What is the NSN for GS551C06-399?
GS551C06-399 is cataloged in the U.S. Government catalog under NSN 5305-01-313-9331. 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.