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Technical Data Sheet
PartsTable / COMPONENT / 18B4-1
18B4-1 ✓ 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 BRACKET ADJUSTING S is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: HEXAGON, head_height: 0.150 INCHES MINIMUM AND 0.163 INCHES MAXIMUM IN, thread_class: 2A A, thread_length: 0.750 INCHES MINIMUM AND 0.940 INCHES MAXIMUM IN, fastener_length: 4.500 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 5305-00-574-0386, 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
18B4-1
NSN: 5305-00-574-0386
FSC: 5305
CAGE: 52511 — HYDRAULIC INDUSTRIES INC SUB OF SUNDSTRAND CORP (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEXAGON
head_height0.150 INCHES MINIMUM AND 0.163 INCHES MAXIMUM IN
thread_class2A A
thread_length0.750 INCHES MINIMUM AND 0.940 INCHES MAXIMUM IN
fastener_length4.500 INCHES NOMINAL IN
thread_directionRIGHT-HAND
width_between_flats0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
nominal_thread_diameter0.250 INCHES IN
thread_quantity_per_inch20
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
material_document_and_classificationSAE GR 5 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5305-00-574-0386
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 18B4-1 · 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)
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE GR 5 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
MATERIAL: STEEL OVERALL
•
THREAD LENGTH: 0.750 INCHES MINIMUM AND 0.940 INCHES MAXIMUM IN
•
HEAD STYLE: HEXAGON
•
THREAD DIRECTION: RIGHT-HAND
•
FASTENER LENGTH: 4.500 INCHES NOMINAL IN
•
THREAD CLASS: 2A A
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
MATERIAL DOCUMENT AND CLASSIFICATIONSAE GR 5 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MATERIALSTEEL OVERALL
THREAD LENGTH0.750 INCHES MINIMUM AND 0.940 INCHES MAXIMUM IN
HEAD STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
FASTENER LENGTH4.500 INCHES NOMINAL IN
THREAD CLASS2A A
NOMINAL THREAD DIAMETER0.250 INCHES IN
WIDTH BETWEEN FLATS0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
1347-2Interchangeable
interchangeable cross-reference
interchangeable
2668663PC16Interchangeable
interchangeable cross-reference
interchangeable
11354Interchangeable
interchangeable cross-reference
interchangeable
367984R1Interchangeable
interchangeable cross-reference
interchangeable
311Interchangeable
interchangeable cross-reference
interchangeable
40885Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 18B4-1?
18B4-1 is a BRACKET ADJUSTING S.
What parts can replace 18B4-1?
There are 20 known substitutes for 18B4-1: 1347-2, 2668663PC16, 11354 and 17 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 18B4-1?
18B4-1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-574-0386. 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