PartsTable
Technical Data Sheet
PartsTable / COMPONENT / 5591-4
5591-4 ✓ Verified by PartsTable
Bestway · 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 RELAY,ELECTROMAGNETIC is a Bestway industrial component. Key specifications include material: IRON CAST BODY, duty_type: INTERMITTENT, body_length: 8.875 INCHES NOMINAL IN, design_type: LIMITED, storage_type: GENERAL PURPOSE WAREHOUSE, overall_length: 2.448 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-174-2924, 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
5591-4
NSN: 5325-00-174-2924
FSC: 5325
CAGE: 61864 — TRW ASSEMBLIES AND FASTENERS GROUP (USA)
SPECIFICATIONS
materialIRON CAST BODY
duty_typeINTERMITTENT
body_length8.875 INCHES NOMINAL IN
design_typeLIMITED
storage_typeGENERAL PURPOSE WAREHOUSE
coil_quantity1
overall_length2.448 INCHES NOMINAL IN
fragility_factorMODERATELY RUGGED
overall_diameter1.622 INCHES NOMINAL IN
special_featuresSHAPE: ROUND; INSIDE DIAMETER: 5.438 IN. NOMINAL IN
winding_quantity1
stud_shank_length0.250 INCHES NOMINAL IN
NSN5325-00-174-2924
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 5591-4 · Bestway ⚠ 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
•
STUD SHANK LENGTH: 0.250 INCHES NOMINAL IN
•
SURFACE TREATMENT: NICKEL OVERALL
•
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 0.164-32 UNIFIED NATIONAL COARSE (UNC)
•
STUD RETENTION METHOD: SCREW BASE
•
STUD OVERALL LENGTH: 0.441 INCHES MINIMUM AND 0.451 INCHES MAXIMUM IN
•
STUD HEAD DIAMETER: 0.394 INCHES MINIMUM AND 0.396 INCHES MAXIMUM IN
•
SNAP FASTENER STUD STYLE: STUD
•
MATERIAL: COPPER ALLOY OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
STUD SHANK LENGTH0.250 INCHES NOMINAL IN
SURFACE TREATMENTNICKEL OVERALL
THREAD SIZE AND SERIES/TYPE DESIGNATOR0.164-32 UNIFIED NATIONAL COARSE (UNC)
STUD RETENTION METHODSCREW BASE
STUD OVERALL LENGTH0.441 INCHES MINIMUM AND 0.451 INCHES MAXIMUM IN
STUD HEAD DIAMETER0.394 INCHES MINIMUM AND 0.396 INCHES MAXIMUM IN
SNAP FASTENER STUD STYLESTUD
MATERIALCOPPER ALLOY OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
A-D958-1Interchangeable
interchangeable cross-reference
interchangeable
3N51PC559Interchangeable
interchangeable cross-reference
interchangeable
3N8PC559Interchangeable
interchangeable cross-reference
interchangeable
1452Interchangeable
interchangeable cross-reference
interchangeable
142364HAInterchangeable
interchangeable cross-reference
interchangeable
L718Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 5591-4?
5591-4 is a RELAY,ELECTROMAGNETIC manufactured by Bestway.
What parts can replace 5591-4?
There are 12 known substitutes for 5591-4: A-D958-1, 3N51PC559, 3N8PC559 and 9 more. Substitute compatibility should be verified for your specific system.
Is 5591-4 still available?
5591-4 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026