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Technical Data Sheet
PartsTable / COMPONENT / 18K4-2
18K4-2 ✓ 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 BOLT,MACHINE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: DOUBLE HEXAGON EXTENDED WASHER, head_height: 0.260 INCHES MAXIMUM IN, thread_class: 2A A, thread_length: 0.619 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN, fastener_length: 0.719 INCHES MINIMUM AND 0.750 INCHES MAXIMUM 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 5306-00-606-9883, 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
18K4-2
NSN: 5306-00-606-9883
FSC: 5306
CAGE: 52511 — HYDRAULIC INDUSTRIES INC SUB OF SUNDSTRAND CORP (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleDOUBLE HEXAGON EXTENDED WASHER
head_height0.260 INCHES MAXIMUM IN
thread_class2A A
thread_length0.619 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
fastener_length0.719 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
features_providedFINISHED HEAD
width_between_flats0.247 INCHES MINIMUM AND 0.252 INCHES MAXIMUM IN
nominal_thread_diameter0.250 INCHES IN
extended_washer_diameter0.365 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
thread_quantity_per_inch20
NSN5306-00-606-9883
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 18K4-2 · 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 DOCUMENT AND CLASSIFICATION: SAE GR 8 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
THREAD DIRECTION: RIGHT-HAND
•
FEATURES PROVIDED: FINISHED HEAD
•
THREAD QUANTITY PER INCH: 20
•
THREAD LENGTH: 0.619 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.260 INCHES MAXIMUM IN
•
EXTENDED WASHER DIAMETER: 0.365 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL DOCUMENT AND CLASSIFICATIONSAE GR 8 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
THREAD DIRECTIONRIGHT-HAND
FEATURES PROVIDEDFINISHED HEAD
THREAD QUANTITY PER INCH20
THREAD LENGTH0.619 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
HEAD HEIGHT0.260 INCHES MAXIMUM IN
EXTENDED WASHER DIAMETER0.365 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
HEAD STYLEDOUBLE HEXAGON EXTENDED WASHER
FASTENER LENGTH0.719 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
1664Interchangeable
interchangeable cross-reference
interchangeable
VAL920Interchangeable
interchangeable cross-reference
interchangeable
1664SIZE1-860PSIInterchangeable
interchangeable cross-reference
interchangeable
G3592-2Interchangeable
interchangeable cross-reference
interchangeable
AS2537SRInterchangeable
interchangeable cross-reference
interchangeable
MIL-A-24319AInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 18K4-2?
18K4-2 is a BOLT,MACHINE.
What parts can replace 18K4-2?
There are 10 known substitutes for 18K4-2: 1664, VAL920, 1664SIZE1-860PSI and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 18K4-2?
18K4-2 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-606-9883. 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