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549-0944-004 — SCREW,EXTERNALLY RELIEVED BODY

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

549-0944-004: SCREW,EXTERNALLY RELIEVED BODY.

The SCREW,EXTERNALLY RELIEVED BODY is a the manufacturer industrial component. Key specifications include head_style: FLAT CHAMFER, head_height: 0.132 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN, thread_class: 2A A, head_diameter: 0.235 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN, internal_drive_style: CROSS RECESS TYPE 1, nominal_thread_diameter: 0.164 INCHES IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-00-486-3568, 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
549-0944-004
NSN: 5305-00-486-3568
FSC: 5305 — Screws
CAGE: 13499 — ROCKWELL COLLINS, INC. DBA COLLINS AEROSPACE GOVERNMENT SYSTEMS DIV COLLINS AEROSPACE - GOVERNMENT SYSTEMS (USA)
SPECIFICATIONS
head_styleFLAT CHAMFER
head_height0.132 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN
thread_class2A A
head_diameter0.235 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN
internal_drive_styleCROSS RECESS TYPE 1
nominal_thread_diameter0.164 INCHES IN
first_diameter_from_head0.139 INCHES MINIMUM AND 0.145 INCHES MAXIMUM IN
third_diameter_from_head0.250 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN
thread_quantity_per_inch32
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
second_diameter_from_head0.159 INCHES MINIMUM AND 0.165 INCHES MAXIMUM IN
distance_from_largest_bearing_surface_of_head_to_end_of_third_diameter5.118 INCHES MINIMUM AND 5.148 INCHES MAXIMUM IN
NSN5305-00-486-3568
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 549-0944-004 · 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: 0.132 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN
•
FIRST DIAMETER FROM HEAD: 0.139 INCHES MINIMUM AND 0.145 INCHES MAXIMUM IN
•
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF SECOND DIAMETER: 5.024 INCHES MINIMUM AND 5.054 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 0.164 INCHES IN
•
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF THIRD DIAMETER: 5.118 INCHES MINIMUM AND 5.148 INCHES MAXIMUM IN
•
HEAD STYLE: FLAT CHAMFER
•
SECOND DIAMETER FROM HEAD: 0.159 INCHES MINIMUM AND 0.165 INCHES MAXIMUM IN
•
INTERNAL DRIVE STYLE: CROSS RECESS TYPE 1
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.132 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN
FIRST DIAMETER FROM HEAD0.139 INCHES MINIMUM AND 0.145 INCHES MAXIMUM IN
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF SECOND DIAMETER5.024 INCHES MINIMUM AND 5.054 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.164 INCHES IN
DISTANCE FROM LARGEST BEARING SURFACE OF HEAD TO END OF THIRD DIAMETER5.118 INCHES MINIMUM AND 5.148 INCHES MAXIMUM IN
HEAD STYLEFLAT CHAMFER
SECOND DIAMETER FROM HEAD0.159 INCHES MINIMUM AND 0.165 INCHES MAXIMUM IN
INTERNAL DRIVE STYLECROSS RECESS TYPE 1
THREAD CLASS2A A
THREAD QUANTITY PER INCH32
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

No substitute or cross-reference records for this part.

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 549-0944-004?
549-0944-004 is a SCREW,EXTERNALLY RELIEVED BODY.
What is the NSN for 549-0944-004?
549-0944-004 is cataloged in the U.S. Government catalog under NSN 5305-00-486-3568. 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.