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Technical Data Sheet
PartsTable / COMPONENT / 5591-1
5591-1 ✓ 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 PIN,SHOULDER,HEADLESS is a the manufacturer industrial component. Key specifications include color: BLACK BARREL, material: STEEL CORROSION RESISTING OVERALL, groove_width: 0.042 INCHES NOMINAL IN, shank_length: 0.750 INCHES NOMINAL IN, thread_class: 2A A, grommet_style: ROUND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-01-051-7937, 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
5591-1
NSN: 5325-01-051-7937
FSC: 5325
CAGE: 83014 — HARTWELL CORPORATION (USA)
SPECIFICATIONS
colorBLACK BARREL
materialSTEEL CORROSION RESISTING OVERALL
groove_width0.042 INCHES NOMINAL IN
shank_length0.750 INCHES NOMINAL IN
thread_class2A A
grommet_styleROUND
hole_diameter0.312 INCHES NOMINAL IN
thread_length0.500 INCHES MINIMUM IN
overall_height0.466 INCHES NOMINAL IN
overall_length2.250 INCHES NOMINAL IN
shank_diameter0.138 INCHES NOMINAL IN
surface_finish125.0 MICROINCHES OVERALL
NSN5325-01-051-7937
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 5591-1 · 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
•
COLOR: BLACK BARREL
•
GROOVE OUTSIDE DIAMETER: 0.297 INCHES NOMINAL IN
•
GROMMET CONSTRUCTION TYPE: SPLIT
•
FLANGE THICKNESS: 0.095 INCHES NOMINAL IN
•
GROMMET STYLE: ROUND
•
GROOVE WIDTH: 0.042 INCHES NOMINAL IN
•
LARGE FLANGE OUTSIDE DIAMETER: 0.420 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
COLORBLACK BARREL
GROOVE OUTSIDE DIAMETER0.297 INCHES NOMINAL IN
GROMMET CONSTRUCTION TYPESPLIT
FLANGE THICKNESS0.095 INCHES NOMINAL IN
OVERALL HEIGHT0.466 INCHES NOMINAL IN
GROMMET STYLEROUND
GROOVE WIDTH0.042 INCHES NOMINAL IN
LARGE FLANGE OUTSIDE DIAMETER0.420 INCHES NOMINAL IN
HOLE DIAMETER0.312 INCHES NOMINAL IN
MATERIALPLASTIC POLYCARBONATE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
55911Interchangeable
interchangeable cross-reference
interchangeable
933B055911Interchangeable
interchangeable cross-reference
interchangeable
4029-3Interchangeable
interchangeable cross-reference
interchangeable
HN5G-51-1Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 5591-1?
5591-1 is a PIN,SHOULDER,HEADLESS.
What parts can replace 5591-1?
There are 4 known substitutes for 5591-1: 55911, 933B055911, 4029-3 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 5591-1?
5591-1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-01-051-7937. 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