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Technical Data Sheet
PartsTable / COMPONENT / PQ-4D-3
PQ-4D-3 ✓ 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 THUMBSCREW is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: KNURLED NO. 1, head_height: 0.188 INCHES NOMINAL IN, point_style: FLAT, thread_class: 2A A, head_diameter: 0.750 INCHES NOMINAL 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 5305-00-721-4589, 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
PQ-4D-3
NSN: 5305-00-721-4589
FSC: 5305
CAGE: 29440 — W. M. BERG, INC. (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleKNURLED NO. 1
head_height0.188 INCHES NOMINAL IN
point_styleFLAT
thread_class2A A
head_diameter0.750 INCHES NOMINAL IN
thread_length0.625 INCHES MINIMUM IN
fastener_length0.750 INCHES NOMINAL IN
thread_directionRIGHT-HAND
surface_treatmentPASSIVATE OVERALL
nominal_thread_diameter0.250 INCHES IN
thread_quantity_per_inch20
NSN5305-00-721-4589
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: PQ-4D-3 · 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
•
MATERIAL: STEEL OVERALL
•
THREAD LENGTH: 0.625 INCHES MINIMUM IN
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
HEAD HEIGHT: 0.188 INCHES NOMINAL IN
•
HEAD DIAMETER: 0.750 INCHES NOMINAL IN
•
HEAD STYLE: KNURLED NO. 1
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL OVERALL
THREAD LENGTH0.625 INCHES MINIMUM IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
HEAD HEIGHT0.188 INCHES NOMINAL IN
HEAD DIAMETER0.750 INCHES NOMINAL IN
HEAD STYLEKNURLED NO. 1
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD DIAMETER0.250 INCHES IN
THREAD CLASS2A A
SURFACE TREATMENTPASSIVATE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
4049Interchangeable
interchangeable cross-reference
interchangeable
1074Interchangeable
interchangeable cross-reference
interchangeable
4054Interchangeable
interchangeable cross-reference
interchangeable
2266LITEM47Interchangeable
interchangeable cross-reference
interchangeable
AN16KN0AInterchangeable
interchangeable cross-reference
interchangeable
AH32332U20Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is PQ-4D-3?
PQ-4D-3 is a THUMBSCREW.
What parts can replace PQ-4D-3?
There are 15 known substitutes for PQ-4D-3: 4049, 1074, 4054 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for PQ-4D-3?
PQ-4D-3 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-721-4589. 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