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PartsTable / COMPONENT / GS550H08-5
GS550H08-5 ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The SCREW,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL COMP 303 OVERALL, head_style: FLAT CHAMFER, head_height: 0.156 INCHES NOMINAL IN, thread_class: 2A A, head_diameter: 0.312 INCHES NOMINAL IN, thread_length: 0.156 INCHES MINIMUM IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-068-9203, 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
GS550H08-5
NSN: 5305-00-068-9203
FSC: 5305
CAGE: 26512 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialSTEEL COMP 303 OVERALL
head_styleFLAT CHAMFER
head_height0.156 INCHES NOMINAL IN
thread_class2A A
head_diameter0.312 INCHES NOMINAL IN
thread_length0.156 INCHES MINIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length5.000 INCHES NOMINAL IN
hardness_rating75.0 ROCKWELL B MINIMUM AND 83.0 ROCKWELL B MAXIMUM OVERALL
shoulder_length0.281 INCHES NOMINAL FIRST SHOULDER IN
thread_directionRIGHT-HAND
shoulder_diameter0.188 INCHES NOMINAL FIRST SHOULDER IN
NSN5305-00-068-9203
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: GS550H08-5 · 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
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
THREAD LENGTH: 0.156 INCHES MINIMUM IN
•
HEAD STYLE: FLAT CHAMFER
•
HEAD HEIGHT: 0.156 INCHES NOMINAL IN
•
SHOULDER LENGTH: 0.281 INCHES NOMINAL FIRST SHOULDER IN
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
•
SHOULDER DIAMETER: 0.188 INCHES NOMINAL FIRST SHOULDER IN
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
THREAD LENGTH0.156 INCHES MINIMUM IN
HEAD STYLEFLAT CHAMFER
HEAD HEIGHT0.156 INCHES NOMINAL IN
SHOULDER LENGTH0.281 INCHES NOMINAL FIRST SHOULDER IN
SHOULDER SHAPEROUND FIRST SHOULDER
SHOULDER DIAMETER0.188 INCHES NOMINAL FIRST SHOULDER IN
THREAD DIRECTIONRIGHT-HAND
HEAD DIAMETER0.312 INCHES NOMINAL IN
THREAD CLASS2A A
VERIFIED SUBSTITUTES & CROSS-REFERENCES 26
4318PInterchangeable
interchangeable cross-reference
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4318Interchangeable
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4308Interchangeable
interchangeable cross-reference
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70-0060-9577-5Interchangeable
interchangeable cross-reference
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1273Interchangeable
interchangeable cross-reference
interchangeable
52430Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is GS550H08-5?
GS550H08-5 is a SCREW,SHOULDER.
What parts can replace GS550H08-5?
There are 26 known substitutes for GS550H08-5: 4318P, 4318, 4308 and 23 more. Substitute compatibility should be verified for your specific system.
What is the NSN for GS550H08-5?
GS550H08-5 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-068-9203. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026