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Technical Data Sheet
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8437491 — Technical Data Sheet

✓ 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 RETAINER,DIODE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: KNURLED NO. 1, head_height: 0.437 INCHES NOMINAL IN, point_style: UNIVERSAL, point_length: 0.500 INCHES NOMINAL IN, thread_class: 2A A.

This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System under NSN 5305-00-794-6008, 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
8437491
NSN: 5305-00-794-6008
FSC: 5305
CAGE: 19204 — ARMY, UNITED STATES DEPARTMENT OF THE DBA ROCK ISLAND ARSENAL JMTC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleKNURLED NO. 1
head_height0.437 INCHES NOMINAL IN
point_styleUNIVERSAL
point_length0.500 INCHES NOMINAL IN
thread_class2A A
head_diameter1.250 INCHES NOMINAL IN
thread_length0.937 INCHES MINIMUM IN
point_diameter0.562 INCHES NOMINAL IN
fastener_length1.625 INCHES NOMINAL IN
thread_directionRIGHT-HAND
surface_treatmentCADMIUM AND CHROMATE OVERALL
NSN5305-00-794-6008
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 8437491 · 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
•
HEAD DIAMETER: 1.250 INCHES NOMINAL IN
•
POINT LENGTH: 0.500 INCHES NOMINAL IN
•
HEAD STYLE: KNURLED NO. 1
•
HEAD HEIGHT: 0.437 INCHES NOMINAL IN
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
MATERIAL: STEEL OVERALL
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TYPE 2,CLASS 3 FED SPEC ALL TREATMENT RESPONSES OVERALL
•
NOMINAL THREAD DIAMETER: 0.375 INCHES IN
TECHNICAL CHARACTERISTICS
HEAD DIAMETER1.250 INCHES NOMINAL IN
POINT LENGTH0.500 INCHES NOMINAL IN
HEAD STYLEKNURLED NO. 1
HEAD HEIGHT0.437 INCHES NOMINAL IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
MATERIALSTEEL OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TYPE 2,CLASS 3 FED SPEC ALL TREATMENT RESPONSES OVERALL
NOMINAL THREAD DIAMETER0.375 INCHES IN
POINT SWIVEL INCLUDED ANGLE20.0 DEGREES NOMINAL
THREAD DIRECTIONRIGHT-HAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
656-4InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
MIL-PRF-1/1105InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
MILE1-1105InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
338366R91InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
125-28InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
656P4InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 8437491?
8437491 is a RETAINER,DIODE.
What parts can replace 8437491?
There are 11 known substitutes for 8437491: 656-4, MIL-PRF-1/1105, MILE1-1105 and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 8437491?
8437491 is cataloged in the Federal Logistics Information System under NSN 5305-00-794-6008. This indicates validated use in U.S. government and defense supply chains.
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Last verified: September 2026