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Technical Data Sheet
PartsTable / COMPONENT / 158187
158187 ✓ 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 8740 OVERALL, head_height: 0.165 INCHES MINIMUM AND 0.185 INCHES MAXIMUM IN, thread_class: 2A A, head_diameter: 0.280 INCHES MINIMUM AND 0.290 INCHES MAXIMUM IN, thread_length: 0.625 INCHES MINIMUM AND 0.688 INCHES MAXIMUM IN, fastener_length: 0.734 INCHES MINIMUM AND 0.736 INCHES MAXIMUM IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-297-8359, 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
158187
NSN: 5305-00-297-8359
FSC: 5305
CAGE: 00198 — PRATT & WHITNEY CANADA CORP DIV PRATT & WHITNEY CANADA CORP. (CAN)
SPECIFICATIONS
materialSTEEL COMP 8740 OVERALL
head_height0.165 INCHES MINIMUM AND 0.185 INCHES MAXIMUM IN
thread_class2A A
head_diameter0.280 INCHES MINIMUM AND 0.290 INCHES MAXIMUM IN
thread_length0.625 INCHES MINIMUM AND 0.688 INCHES MAXIMUM IN
fastener_length0.734 INCHES MINIMUM AND 0.736 INCHES MAXIMUM IN
hardness_rating32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OVERALL
internal_drive_styleSLOT
nominal_thread_diameter0.190 INCHES IN
extended_washer_diameter0.360 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN
NSN5305-00-297-8359
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 158187 · 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
•
EXTENDED WASHER DIAMETER: 0.360 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN
•
FIRST DIAMETER FROM HEAD: 0.155 INCHES MINIMUM AND 0.165 INCHES MAXIMUM IN
•
THREAD CLASS: 2A A
•
HEAD HEIGHT: 0.165 INCHES MINIMUM AND 0.185 INCHES MAXIMUM IN
•
THREAD QUANTITY PER INCH: 24
•
FASTENER LENGTH: 0.734 INCHES MINIMUM AND 0.736 INCHES MAXIMUM IN
•
HEAD DIAMETER: 0.280 INCHES MINIMUM AND 0.290 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.625 INCHES MINIMUM AND 0.688 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
EXTENDED WASHER DIAMETER0.360 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN
FIRST DIAMETER FROM HEAD0.155 INCHES MINIMUM AND 0.165 INCHES MAXIMUM IN
THREAD CLASS2A A
HEAD HEIGHT0.165 INCHES MINIMUM AND 0.185 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH24
FASTENER LENGTH0.734 INCHES MINIMUM AND 0.736 INCHES MAXIMUM IN
HEAD DIAMETER0.280 INCHES MINIMUM AND 0.290 INCHES MAXIMUM IN
THREAD LENGTH0.625 INCHES MINIMUM AND 0.688 INCHES MAXIMUM IN
INTERNAL DRIVE STYLESLOT
NOMINAL THREAD DIAMETER0.190 INCHES IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
33811113Interchangeable
interchangeable cross-reference
interchangeable
39690Interchangeable
interchangeable cross-reference
interchangeable
158187Interchangeable
interchangeable cross-reference
interchangeable
EAB1719Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 158187?
158187 is a SCREW,EXTERNALLY RELIEVED BODY.
What parts can replace 158187?
There are 4 known substitutes for 158187: 33811113, 39690, 158187 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 158187?
158187 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-297-8359. 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