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Technical Data Sheet
PartsTable / COMPONENT / 21161-2
21161-2 ✓ 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,MACHINE is a the manufacturer industrial component. Key specifications include head_style: FLAT CHAMFER, head_height: 0.067 INCHES NOMINAL IN, thread_class: 2A A, head_diameter: 0.225 INCHES NOMINAL IN, thread_length: 1.810 INCHES NOMINAL IN, screw_material: STEEL CORROSION RESISTING. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-095-3958, 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
21161-2
NSN: 5305-01-095-3958
FSC: 5305
CAGE: 30377 — SMITHS AEROSPACE, INC., ELECTRONIC SYSTEMS-GRAND RAPIDS (USA)
SPECIFICATIONS
head_styleFLAT CHAMFER
head_height0.067 INCHES NOMINAL IN
thread_class2A A
head_diameter0.225 INCHES NOMINAL IN
thread_length1.810 INCHES NOMINAL IN
screw_materialSTEEL CORROSION RESISTING
fastener_length1.810 INCHES NOMINAL IN
special_featuresINTERNAL DRIVE STYLE MAY BE SLOTTED OR CROSS RECESSED
thread_directionRIGHT-HAND
nominal_thread_diameter0.112 INCHES IN
screw_surface_treatmentPASSIVATE
thread_quantity_per_inch40
NSN5305-01-095-3958
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 21161-2 · 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 HEIGHT: 0.067 INCHES NOMINAL IN
•
SCREW SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE
•
THREAD LENGTH: 1.810 INCHES NOMINAL IN
•
THREAD CLASS: 2A A
•
SCREW SURFACE TREATMENT: PASSIVATE
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
THREAD DIRECTION: RIGHT-HAND
•
HEAD STYLE: FLAT CHAMFER
TECHNICAL CHARACTERISTICS (FLIS)
HEAD HEIGHT0.067 INCHES NOMINAL IN
SCREW SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE
THREAD LENGTH1.810 INCHES NOMINAL IN
THREAD CLASS2A A
SCREW SURFACE TREATMENTPASSIVATE
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
THREAD DIRECTIONRIGHT-HAND
HEAD STYLEFLAT CHAMFER
NOMINAL THREAD DIAMETER0.112 INCHES IN
THREAD QUANTITY PER INCH40
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
WW-V-35Interchangeable
interchangeable cross-reference
interchangeable
T-580-1 1/2Interchangeable
interchangeable cross-reference
interchangeable
21-161Interchangeable
interchangeable cross-reference
interchangeable
JH2116-1Interchangeable
interchangeable cross-reference
interchangeable
ASTM A733Interchangeable
interchangeable cross-reference
interchangeable
W138326T20Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21161-2?
21161-2 is a SCREW,MACHINE.
What parts can replace 21161-2?
There are 15 known substitutes for 21161-2: WW-V-35, T-580-1 1/2, 21-161 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 21161-2?
21161-2 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-095-3958. 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