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PartsTable / COMPONENT / 551690
551690 ✓ 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 SCREW,CAP,HEXAGON HEAD is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: HEXAGON EXTENDED WASHER, head_height: 0.560 INCHES NOMINAL IN, thread_class: 2A A, thread_length: 1.420 INCHES MINIMUM AND 1.480 INCHES MAXIMUM IN, surface_finish: 63.0 MICROINCHES BEARING SURFACE OF HEAD. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-020-5243, 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
551690
NSN: 5305-01-020-5243
FSC: 5305
CAGE: 15434 — CUMMINS INC. (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEXAGON EXTENDED WASHER
head_height0.560 INCHES NOMINAL IN
thread_class2A A
thread_length1.420 INCHES MINIMUM AND 1.480 INCHES MAXIMUM IN
surface_finish63.0 MICROINCHES BEARING SURFACE OF HEAD
fastener_length11.376 INCHES MINIMUM AND 11.402 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
width_between_flats0.554 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN
nominal_thread_diameter0.625 INCHES IN
extended_washer_diameter0.990 INCHES MINIMUM AND 1.010 INCHES MAXIMUM IN
thread_quantity_per_inch18
NSN5305-01-020-5243
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 551690 · 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
•
FASTENER LENGTH: 11.376 INCHES MINIMUM AND 11.402 INCHES MAXIMUM IN
•
EXTENDED WASHER THICKNESS: 0.180 INCHES NOMINAL IN
•
HEAD STYLE: HEXAGON EXTENDED WASHER
•
MATERIAL: STEEL OVERALL
•
SURFACE FINISH: 63.0 MICROINCHES BEARING SURFACE OF HEAD
•
THREAD SERIES DESIGNATOR: UNF
•
THREAD LENGTH: 1.420 INCHES MINIMUM AND 1.480 INCHES MAXIMUM IN
•
THREAD CLASS: 2A A
TECHNICAL CHARACTERISTICS (FLIS)
FASTENER LENGTH11.376 INCHES MINIMUM AND 11.402 INCHES MAXIMUM IN
EXTENDED WASHER THICKNESS0.180 INCHES NOMINAL IN
HEAD STYLEHEXAGON EXTENDED WASHER
MATERIALSTEEL OVERALL
SURFACE FINISH63.0 MICROINCHES BEARING SURFACE OF HEAD
THREAD SERIES DESIGNATORUNF
THREAD LENGTH1.420 INCHES MINIMUM AND 1.480 INCHES MAXIMUM IN
THREAD CLASS2A A
EXTENDED WASHER DIAMETER0.990 INCHES MINIMUM AND 1.010 INCHES MAXIMUM IN
HEAD HEIGHT0.560 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
32060-34Interchangeable
interchangeable cross-reference
interchangeable
29983-31Interchangeable
interchangeable cross-reference
interchangeable
32754-32Interchangeable
interchangeable cross-reference
interchangeable
556507Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 551690?
551690 is a SCREW,CAP,HEXAGON HEAD.
What parts can replace 551690?
There are 4 known substitutes for 551690: 32060-34, 29983-31, 32754-32 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 551690?
551690 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-020-5243. 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