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Technical Data Sheet
PartsTable / COMPONENT / 1665-21-4
1665-21-4 ✓ 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 TRANSFORMER,POWER is a the manufacturer industrial component. Key specifications include material: STEEL COMP 5015, overall_width: 2.562 INCHES NOMINAL IN, thread_length: 1.156 INCHES MINIMUM NUT THREAD IN, inclosure_type: OPEN, overall_height: 2.875 INCHES NOMINAL IN, overall_length: 3.062 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5307-00-359-1243, 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
1665-21-4
NSN: 5307-00-359-1243
FSC: 5307
CAGE: 20076 — TITAN WHEEL CORPORATION OF ILLINOIS (USA)
SPECIFICATIONS
materialSTEEL COMP 5015
overall_width2.562 INCHES NOMINAL IN
thread_length1.156 INCHES MINIMUM NUT THREAD IN
inclosure_typeOPEN
overall_height2.875 INCHES NOMINAL IN
overall_length3.062 INCHES NOMINAL IN
hardness_rating98.0 ROCKWELL B MINIMUM AND 104.5 ROCKWELL B MAXIMUM
mounting_methodTHREADED STUD(S) SINGLE GROUP
shoulder_length0.188 INCHES NOMINAL IN
frequency_rating60.0 HERTZ NOMINAL SINGLE COMPONENT
style_designatorSHOULDERED
thread_directionRIGHT-HAND NUT THREAD
NSN5307-00-359-1243
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 1665-21-4 · 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
•
STUD END SHANK LENGTH: 0.187 INCHES NOMINAL IN
•
DISTANCE ACROSS FLATS: 0.938 INCHES NOMINAL IN
•
THREAD PITCH DIAMETERS: +0.7044 TO 0.7084 INCHES NUT THREAD IN
•
SHOULDER DIAMETER: 1.062 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 16 NUT THREAD
•
STUD END SHANK DIAMETER: 0.786 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND STUD THREAD
TECHNICAL CHARACTERISTICS (FLIS)
STUD END SHANK LENGTH0.187 INCHES NOMINAL IN
DISTANCE ACROSS FLATS0.938 INCHES NOMINAL IN
THREAD PITCH DIAMETERS+0.7044 TO 0.7084 INCHES NUT THREAD IN
SHOULDER DIAMETER1.062 INCHES NOMINAL IN
THREAD QUANTITY PER INCH16 NUT THREAD
STUD END SHANK DIAMETER0.786 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND STUD THREAD
OVERALL LENGTH3.125 INCHES NOMINAL IN
NOMINAL THREAD SIZE0.750 INCHES STUD THREAD IN
THREAD PITCH DIAMETERS+0.7044 TO 0.7084 INCHES STUD THREAD IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 26
110435Interchangeable
interchangeable cross-reference
interchangeable
X1571Interchangeable
interchangeable cross-reference
interchangeable
6-1-2330-20-162AInterchangeable
interchangeable cross-reference
interchangeable
ATU18Interchangeable
interchangeable cross-reference
interchangeable
6-1-2330-20-162Interchangeable
interchangeable cross-reference
interchangeable
44117Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1665-21-4?
1665-21-4 is a TRANSFORMER,POWER.
What parts can replace 1665-21-4?
There are 26 known substitutes for 1665-21-4: 110435, X1571, 6-1-2330-20-162A and 23 more. Substitute compatibility should be verified for your specific system.
Is 1665-21-4 still available?
1665-21-4 is currently cancelled.
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PartsTable Design LLC · partstable.com
Last verified: July 2026