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Technical Data Sheet
PartsTable / COMPONENT / K8239-4
K8239-4 ✓ 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 STUD,RECESSED is a the manufacturer industrial component. Key specifications include material: STEEL, thread_class: 3 NUT THREAD, thread_length: 2.375 INCHES MINIMUM NUT THREAD IN, overall_length: 9.938 INCHES NOMINAL IN, hardness_rating: 35.0 ROCKWELL C NOMINAL, style_designator: RECESSED. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5307-00-206-7566, 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
K8239-4
NSN: 5307-00-206-7566
FSC: 5307
CAGE: 15434 — CUMMINS INC. (USA)
SPECIFICATIONS
materialSTEEL
thread_class3 NUT THREAD
thread_length2.375 INCHES MINIMUM NUT THREAD IN
overall_length9.938 INCHES NOMINAL IN
hardness_rating35.0 ROCKWELL C NOMINAL
style_designatorRECESSED
thread_directionRIGHT-HAND STUD THREAD
nominal_thread_size1.250 INCHES NUT THREAD IN
thread_quantity_per_inch12 STUD THREAD
thread_series_designatorUNF STUD THREAD
length_of_recessed_portion_of_shank4.125 INCHES NOMINAL IN
diameter_of_recessed_portion_of_shank1.062 INCHES NOMINAL IN
NSN5307-00-206-7566
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: K8239-4 · 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: UNF NUT THREAD
•
THREAD CLASS: 3A STUD THREAD A
•
THREAD QUANTITY PER INCH: 12 STUD THREAD
•
THREAD DIRECTION: RIGHT-HAND STUD THREAD
•
NOMINAL THREAD SIZE: 1.250 INCHES STUD THREAD IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIES DESIGNATORUNF NUT THREAD
THREAD CLASS3A STUD THREAD A
THREAD QUANTITY PER INCH12 STUD THREAD
OVERALL LENGTH9.938 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND STUD THREAD
PART NAME ASSIGNED BY CONTROLLING AGENCYNAVY SPECIAL PROJECT
NOMINAL THREAD SIZE1.250 INCHES STUD THREAD IN
NOMINAL THREAD SIZE1.250 INCHES NUT THREAD IN
MATERIALSTEEL
HARDNESS RATING35.0 ROCKWELL C NOMINAL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
82394Interchangeable
interchangeable cross-reference
interchangeable
32950Interchangeable
interchangeable cross-reference
interchangeable
82395Interchangeable
interchangeable cross-reference
interchangeable
3413180000Interchangeable
interchangeable cross-reference
interchangeable
49009000Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is K8239-4?
K8239-4 is a STUD,RECESSED.
What parts can replace K8239-4?
There are 5 known substitutes for K8239-4: 82394, 32950, 82395 and 2 more. Substitute compatibility should be verified for your specific system.
Is K8239-4 still available?
K8239-4 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