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Technical Data Sheet
PartsTable / COMPONENT / M166-1190
M166-1190 ✓ 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,EXTERNALLY RELIEVED BODY is a the manufacturer industrial component. Key specifications include material: STEEL COMP 303 OVERALL, head_style: FLAT CHAMFER, head_height: 0.312 INCHES NOMINAL IN, thread_class: 2A A, head_diameter: 0.312 INCHES NOMINAL IN, thread_length: 0.250 INCHES MINIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-088-6036, 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
M166-1190
NSN: 5305-00-088-6036
FSC: 5305
CAGE: 54418 — MILTOPE CORPORATION (USA)
SPECIFICATIONS
materialSTEEL COMP 303 OVERALL
head_styleFLAT CHAMFER
head_height0.312 INCHES NOMINAL IN
thread_class2A A
head_diameter0.312 INCHES NOMINAL IN
thread_length0.250 INCHES MINIMUM IN
fastener_length0.781 INCHES NOMINAL IN
thread_directionRIGHT-HAND
surface_treatmentPASSIVATE OVERALL
internal_drive_styleSLOT
nominal_thread_diameter0.164 INCHES IN
first_diameter_from_head0.114 INCHES NOMINAL IN
NSN5305-00-088-6036
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: M166-1190 · 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
•
NOMINAL THREAD DIAMETER: 0.164 INCHES IN
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD LENGTH: 0.250 INCHES MINIMUM IN
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
HEAD DIAMETER: 0.312 INCHES NOMINAL IN
•
FIRST DIAMETER FROM HEAD: 0.114 INCHES NOMINAL IN
•
HEAD STYLE: FLAT CHAMFER
•
MATERIAL: STEEL COMP 303 OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL THREAD DIAMETER0.164 INCHES IN
THREAD DIRECTIONRIGHT-HAND
THREAD LENGTH0.250 INCHES MINIMUM IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
HEAD DIAMETER0.312 INCHES NOMINAL IN
FIRST DIAMETER FROM HEAD0.114 INCHES NOMINAL IN
HEAD STYLEFLAT CHAMFER
MATERIALSTEEL COMP 303 OVERALL
INTERNAL DRIVE STYLESLOT
THREAD QUANTITY PER INCH32
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
PEF90S/4P-12Interchangeable
interchangeable cross-reference
interchangeable
Z128Interchangeable
interchangeable cross-reference
interchangeable
25G227Interchangeable
interchangeable cross-reference
interchangeable
BPJ07Interchangeable
interchangeable cross-reference
interchangeable
AG0773Interchangeable
interchangeable cross-reference
interchangeable
65567Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is M166-1190?
M166-1190 is a SCREW,EXTERNALLY RELIEVED BODY.
What parts can replace M166-1190?
There are 20 known substitutes for M166-1190: PEF90S/4P-12, Z128, 25G227 and 17 more. Substitute compatibility should be verified for your specific system.
Is M166-1190 still available?
M166-1190 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