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Technical Data Sheet

78138-1 — Technical Data Sheet

✓ 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 CIRCUIT BREAKER is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY SEAT, body_style: MULTIPOLE-SINGLE ACTUATOR TYPE, body_width: 1.281 INCHES MAXIMUM IN, head_style: HEXAGON, seat_angle: 37.0 DEGREES ALL ENDS, body_length: 1.562 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-018-1381, 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→ 78138-1
NSN: 5305-00-018-1381
FSC: 5305
CAGE: 24617 — GENERAL MOTORS CORP (USA)
SPECIFICATIONS
materialALUMINUM ALLOY SEAT
body_styleMULTIPOLE-SINGLE ACTUATOR TYPE
body_width1.281 INCHES MAXIMUM IN
head_styleHEXAGON
seat_angle37.0 DEGREES ALL ENDS
body_length1.562 INCHES MAXIMUM IN
head_height0.226 INCHES MINIMUM AND 0.243 INCHES MAXIMUM IN
reset_methodMANUAL
storage_typeGENERAL PURPOSE WAREHOUSE
thread_class3A ALL ENDS A
pole_quantity2
thread_length1.000 INCHES MINIMUM IN
NSN5305-00-018-1381
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 78138-1 · 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 QUANTITY PER INCH: 24
•
WIDTH BETWEEN FLATS: 0.551 INCHES MINIMUM AND 0.563 INCHES MAXIMUM IN
•
HARDNESS RATING: 23.0 ROCKWELL C MINIMUM AND 30.0 ROCKWELL C MAXIMUM OVERALL
•
THREAD SERIES DESIGNATOR: UNF
•
NONDEFINITIVE SPEC/STD DATA: 2 TYPE AND 10P STYLE AND 5 GRADE
•
MATERIAL: STEEL OVERALL
•
HEAD STYLE: HEXAGON
•
HEAD HEIGHT: 0.226 INCHES MINIMUM AND 0.243 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD QUANTITY PER INCH24
WIDTH BETWEEN FLATS0.551 INCHES MINIMUM AND 0.563 INCHES MAXIMUM IN
HARDNESS RATING23.0 ROCKWELL C MINIMUM AND 30.0 ROCKWELL C MAXIMUM OVERALL
THREAD SERIES DESIGNATORUNF
NONDEFINITIVE SPEC/STD DATA2 TYPE AND 10P STYLE AND 5 GRADE
MATERIALSTEEL OVERALL
HEAD STYLEHEXAGON
HEAD HEIGHT0.226 INCHES MINIMUM AND 0.243 INCHES MAXIMUM IN
MINIMUM TENSILE STRENGTH120000 POUNDS PER SQUARE INCH LBS
FASTENER LENGTH2.500 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
M271InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
5119-4824-3804PC1-217-27InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
SMD557971-2InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
M39019-03-68InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
M39019-3-70InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
FFS85TYPE2STYLE10PGRADE5InterchangeableGOVERNMENT REGISTRY
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLEDGOVERNMENT REGISTRY
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 78138-1?
78138-1 is a CIRCUIT BREAKER. It is classified as a MRO (MRO_GENERAL).
What parts can replace 78138-1?
There are 15 known substitutes for 78138-1: M271, 5119-4824-3804PC1-217-27, SMD557971-2 and 12 more. Substitute compatibility should be verified for your specific system.
Is 78138-1 still available?
78138-1 is currently cancelled.
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