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4438 ✓ 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

FILTER ELEMENT,INTAKE AIR CLEANE. Key specifications include material: STEEL, shank_shape: HEXAGON, overall_length: 5.250 INCHES NOMINAL IN, shank_width_across_flats: 0.750 INCHES NOMINAL IN, nondefinitive_spec/std_data: 2 TYPE AND 6 CLASS, specification/standard_data: 05047-ASME B107.48 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-005-3621, 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
4438
NSN: 5305-00-005-3621
FSC: 5305
CAGE: 00141 — ROLLER BEARING CO OF AMERICA, INC DIV PIC DESIGN (USA)
SPECIFICATIONS
materialSTEEL
shank_shapeHEXAGON
overall_length5.250 INCHES NOMINAL IN
shank_width_across_flats0.750 INCHES NOMINAL IN
nondefinitive_spec/std_data2 TYPE AND 6 CLASS
specification/standard_data05047-ASME B107.48 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
NSN5305-00-005-3621
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 4438 · 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)
•
WIDTH ACROSS FLATS: 0.156 INCHES NOMINAL IN
•
THREAD CLASS: 2A A
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
SHOULDER DIAMETER: 0.311 INCHES MINIMUM AND 0.312 INCHES MAXIMUM FIRST SHOULDER IN
•
HEAD STYLE: FLAT CHAMFER
•
SHOULDER LENGTH: 0.313 INCHES MINIMUM AND 0.315 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD QUANTITY PER INCH: 20
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
WIDTH ACROSS FLATS0.156 INCHES NOMINAL IN
THREAD CLASS2A A
NOMINAL THREAD DIAMETER0.250 INCHES IN
SHOULDER DIAMETER0.311 INCHES MINIMUM AND 0.312 INCHES MAXIMUM FIRST SHOULDER IN
HEAD STYLEFLAT CHAMFER
SHOULDER LENGTH0.313 INCHES MINIMUM AND 0.315 INCHES MAXIMUM FIRST SHOULDER IN
THREAD QUANTITY PER INCH20
INTERNAL DRIVE STYLEHEXAGON
MATERIAL DOCUMENT AND CLASSIFICATIONASTM 582 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
T251WInterchangeable
interchangeable cross-reference
interchangeable
251WInterchangeable
interchangeable cross-reference
interchangeable
1112Interchangeable
interchangeable cross-reference
interchangeable
MANAGEInterchangeable
interchangeable cross-reference
interchangeable
44 3/8Interchangeable
interchangeable cross-reference
interchangeable
J513Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4438?
4438 is a FILTER ELEMENT,INTAKE AIR CLEANE.
What parts can replace 4438?
There are 15 known substitutes for 4438: T251W, 251W, 1112 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4438?
4438 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-005-3621. 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