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125178 ✓ 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 SCREW,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: FLAT CHAMFER, head_height: 0.094 INCHES NOMINAL IN, thread_class: 3A A, head_diameter: 0.281 INCHES NOMINAL IN, thread_length: 0.375 INCHES MINIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-207-4213, 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
125178
NSN: 5305-00-207-4213
FSC: 5305
CAGE: 57712 — TELEMECHANICS INC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleFLAT CHAMFER
head_height0.094 INCHES NOMINAL IN
thread_class3A A
head_diameter0.281 INCHES NOMINAL IN
thread_length0.375 INCHES MINIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length0.625 INCHES NOMINAL IN
shoulder_length0.250 INCHES NOMINAL FIRST SHOULDER IN
thread_directionRIGHT-HAND
features_providedCASEHARDENED
shoulder_diameter0.188 INCHES NOMINAL FIRST SHOULDER IN
NSN5305-00-207-4213
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 125178 · 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
•
SHOULDER DIAMETER: 0.188 INCHES NOMINAL FIRST SHOULDER IN
•
INTERNAL DRIVE STYLE: CROSS RECESS TYPE 1
•
FEATURES PROVIDED: CASEHARDENED
•
HEAD STYLE: FLAT CHAMFER
•
SHOULDER LENGTH: 0.250 INCHES NOMINAL FIRST SHOULDER IN
•
THREAD QUANTITY PER INCH: 40
•
HEAD DIAMETER: 0.281 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.138 INCHES IN
TECHNICAL CHARACTERISTICS (FLIS)
SHOULDER DIAMETER0.188 INCHES NOMINAL FIRST SHOULDER IN
INTERNAL DRIVE STYLECROSS RECESS TYPE 1
FEATURES PROVIDEDCASEHARDENED
HEAD STYLEFLAT CHAMFER
SHOULDER LENGTH0.250 INCHES NOMINAL FIRST SHOULDER IN
THREAD QUANTITY PER INCH40
HEAD DIAMETER0.281 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.138 INCHES IN
THREAD CLASS3A A
THREAD SERIES DESIGNATORUNF
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
IR7315CInterchangeable
interchangeable cross-reference
interchangeable
A2251Interchangeable
interchangeable cross-reference
interchangeable
711273Interchangeable
interchangeable cross-reference
interchangeable
MS90728-51Interchangeable
interchangeable cross-reference
interchangeable
B1821BH031C475NInterchangeable
interchangeable cross-reference
interchangeable
33224Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 125178?
125178 is a SCREW,SHOULDER.
What parts can replace 125178?
There are 7 known substitutes for 125178: IR7315C, A2251, 711273 and 4 more. Substitute compatibility should be verified for your specific system.
Is 125178 still available?
125178 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