PartsTable
Technical Data Sheet
121B ✓ Verified by PartsTable
· MRO · MRO_GENERAL
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 RESISTOR,CURRENT REGULATING is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, base_type: 4 PIN, head_style: DOUBLE HEXAGON, head_height: 0.250 INCHES NOMINAL IN, input_phase: SINGLE SINGLE OPERATING POWER RQMT, current_type: AC/DC. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-362-3707, 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
MRO MRO_GENERAL 121B
NSN: 5306-00-362-3707
FSC: 5306
CAGE: 99267 — BOHN ALUMINUM AND BRASS CO DIV OF GULF AND WESTERN MFG CO SUB OF GULF AND WESTERN INDUSTRIES (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
base_type4 PIN
head_styleDOUBLE HEXAGON
head_height0.250 INCHES NOMINAL IN
input_phaseSINGLE SINGLE OPERATING POWER RQMT
current_typeAC/DC
output_phaseSINGLE SINGLE POWER OUTPUT
thread_class3A A
head_diameter0.685 INCHES MINIMUM AND 0.688 INCHES MAXIMUM IN
overall_height3.500 INCHES NOMINAL IN
overall_length15.000 INCHES NOMINAL IN
connection_typeTHREADED INTERNAL PIPE FIRST END
NSN5306-00-362-3707
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 121B · 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: 0.685 INCHES MINIMUM AND 0.688 INCHES MAXIMUM IN
DISTANCE FROM CENTER OF HEAD TO CENTER OF SHANK: 0.312 INCHES NOMINAL IN
FASTENER LENGTH: 2.375 INCHES NOMINAL IN
HEAD HEIGHT: 0.250 INCHES NOMINAL IN
INTERNAL DRIVE STYLE: W/O INTERNAL DRIVE
HARDNESS RATING: 28.0 ROCKWELL C MINIMUM AND 31.0 ROCKWELL C MAXIMUM OVERALL
DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER: 2.266 INCHES NOMINAL FIRST HOLE IN
MATERIAL DOCUMENT AND CLASSIFICATION: SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
HEAD DIAMETER0.685 INCHES MINIMUM AND 0.688 INCHES MAXIMUM IN
DISTANCE FROM CENTER OF HEAD TO CENTER OF SHANK0.312 INCHES NOMINAL IN
FASTENER LENGTH2.375 INCHES NOMINAL IN
HEAD HEIGHT0.250 INCHES NOMINAL IN
INTERNAL DRIVE STYLEW/O INTERNAL DRIVE
HARDNESS RATING28.0 ROCKWELL C MINIMUM AND 31.0 ROCKWELL C MAXIMUM OVERALL
DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER2.266 INCHES NOMINAL FIRST HOLE IN
MATERIAL DOCUMENT AND CLASSIFICATIONSAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MATERIALSTEEL COMP 3140 OVERALL
THREAD QUANTITY PER INCH20
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
121BUpgraded Successor
successor cross-reference
successor
A30512-9-5Interchangeable
interchangeable cross-reference
interchangeable
850430Interchangeable
interchangeable cross-reference
interchangeable
21055Interchangeable
interchangeable cross-reference
interchangeable
216-27212-1Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-38449Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 121B?
121B is a RESISTOR,CURRENT REGULATING. It is classified as a MRO (MRO_GENERAL).
What parts can replace 121B?
There are 16 known substitutes for 121B: 121B, A30512-9-5, 850430 and 13 more. Substitute compatibility should be verified for your specific system.
Is 121B still available?
121B is currently cancelled.
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