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Technical Data Sheet
PartsTable / COMPONENT / 4KK1/2-20
4KK1/2-20 ✓ 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 4KK1/2-20 is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-01-029-7437, 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
4KK1/2-20
NSN: 5325-01-029-7437
FSC: 5325
CAGE: 29372 — HOWMET GLOBAL FASTENING SYSTEMS INC. DIV TRIDAIR PRODUCTS (USA)
SPECIFICATIONS
Part Number4KK1/2-20
NSN5325-01-029-7437
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 4KK1/2-20 · 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
•
NOMINAL THREAD SIZE: 0.500 INCHES IN
•
MATERIAL: STEEL OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-637,COMP 1215 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
THREAD QUANTITY PER INCH: 20
•
INSERT SIZE: 0.625-11
•
STYLE DESIGNATOR: KEYLOCK
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL JOINT FINE (UNJF)
•
LENGTH: 0.673 INCHES MINIMUM AND 0.703 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL THREAD SIZE0.500 INCHES IN
MATERIALSTEEL OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-637,COMP 1215 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
THREAD QUANTITY PER INCH20
INSERT SIZE0.625-11
STYLE DESIGNATORKEYLOCK
THREAD SERIES DESIGNATORUNIFIED NATIONAL JOINT FINE (UNJF)
LENGTH0.673 INCHES MINIMUM AND 0.703 INCHES MAXIMUM IN
INTERNAL THREAD RELIEF DEPTH0.100 INCHES NOMINAL IN
FULL INTERNAL THREAD LENGTH0.563 INCHES MINIMUM AND 0.613 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
7403605Interchangeable
interchangeable cross-reference
interchangeable
26106Interchangeable
interchangeable cross-reference
interchangeable
526106Interchangeable
interchangeable cross-reference
interchangeable
GGG-R-180Interchangeable
interchangeable cross-reference
interchangeable
GGG-R-180 TY14CL1GRASZ6Interchangeable
interchangeable cross-reference
interchangeable
GVO2224Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4KK1/2-20?
4KK1/2-20 is a 4KK1/2-20.
What parts can replace 4KK1/2-20?
There are 18 known substitutes for 4KK1/2-20: 7403605, 26106, 526106 and 15 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4KK1/2-20?
4KK1/2-20 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-01-029-7437. 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