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Technical Data Sheet
PartsTable / COMPONENT / 1604A
1604A ✓ 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

SWITCH,RADIO FREQUENCY TRANSMISS. Key specifications include shape: RECTANGULAR W/ROUNDED CORNERS, head_style: HEXAGON, grip_length: 3.750 INCHES NOMINAL IN, switch_type: TRANSFER, thread_class: 3A A, usage_design: CALCULATORS,RADIOS,TOYS,PHOTO AND SMOKE ALARMS. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-434-4638, 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
1604A
NSN: 5306-00-434-4638
FSC: 5306
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
shapeRECTANGULAR W/ROUNDED CORNERS
head_styleHEXAGON
grip_length3.750 INCHES NOMINAL IN
switch_typeTRANSFER
thread_class3A A
usage_designCALCULATORS,RADIOS,TOYS,PHOTO AND SMOKE ALARMS
overall_width0.969 INCHES MINIMUM AND 1.043 INCHES MAXIMUM IN
terminal_typeSNAP-ON TOP
thread_length2.250 INCHES MINIMUM IN
overall_height0.610 INCHES MINIMUM AND 0.688 INCHES MAXIMUM IN
overall_length1.830 INCHES MINIMUM AND 1.938 INCHES MAXIMUM IN
fastener_length6.000 INCHES NOMINAL IN
NSN5306-00-434-4638
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 1604A · 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: UNIFIED NATIONAL COARSE (UNC)
•
THREAD LENGTH: 2.250 INCHES MINIMUM IN
•
THREAD DIRECTION: RIGHT-HAND
•
HEAD STYLE: HEXAGON
•
THREAD CLASS: 3A A
•
FASTENER LENGTH: 6.000 INCHES NOMINAL IN
•
GRIP LENGTH: 3.750 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 9
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
THREAD LENGTH2.250 INCHES MINIMUM IN
THREAD DIRECTIONRIGHT-HAND
HEAD STYLEHEXAGON
THREAD CLASS3A A
FASTENER LENGTH6.000 INCHES NOMINAL IN
GRIP LENGTH3.750 INCHES NOMINAL IN
THREAD QUANTITY PER INCH9
NOMINAL THREAD DIAMETER0.875 INCHES IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
522Interchangeable
interchangeable cross-reference
interchangeable
43-0004-00Interchangeable
interchangeable cross-reference
interchangeable
EN22Interchangeable
interchangeable cross-reference
interchangeable
312183-101Interchangeable
interchangeable cross-reference
interchangeable
312183-401Interchangeable
interchangeable cross-reference
interchangeable
312183-201Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1604A?
1604A is a SWITCH,RADIO FREQUENCY TRANSMISS.
What parts can replace 1604A?
There are 9 known substitutes for 1604A: 522, 43-0004-00, EN22 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1604A?
1604A is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-434-4638. 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