PartsTable
Technical Data Sheet
421721 ✓ 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: ROUND, head_height: 0.067 INCHES MINIMUM AND 0.078 INCHES MAXIMUM IN, thread_class: 2A A, head_diameter: 0.169 INCHES MINIMUM AND 0.187 INCHES MAXIMUM IN, thread_length: 0.146 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN, screw_material: COPPER ALLOY. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-042-1721, 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
421721
NSN: 5305-00-042-1721
FSC: 5305
CAGE: 24617 — GENERAL MOTORS CORP (USA)
SPECIFICATIONS
head_styleROUND
head_height0.067 INCHES MINIMUM AND 0.078 INCHES MAXIMUM IN
thread_class2A A
head_diameter0.169 INCHES MINIMUM AND 0.187 INCHES MAXIMUM IN
thread_length0.146 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN
screw_materialCOPPER ALLOY
fastener_length0.156 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
internal_drive_styleCROSS RECESS TYPE 1
nominal_thread_diameter0.099 INCHES IN
minimum_tensile_strength55000 POUNDS PER SQUARE INCH LBS
thread_quantity_per_inch48
NSN5305-00-042-1721
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 421721 · 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
INTERNAL DRIVE STYLE: CROSS RECESS TYPE 1
SCREW MATERIAL: COPPER ALLOY
HEAD HEIGHT: 0.067 INCHES MINIMUM AND 0.078 INCHES MAXIMUM IN
THREAD DIRECTION: RIGHT-HAND
NONDEFINITIVE SPEC/STD DATA: 1 TYPE AND 1S STYLE
HEAD STYLE: ROUND
FASTENER LENGTH: 0.156 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN
SCREW MATERIAL DOCUMENT AND CLASSIFICATION: QQ-B-613 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-B-626 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-W-321 FED SPEC SINGLE MATERIAL RESPONSE
TECHNICAL CHARACTERISTICS (FLIS)
INTERNAL DRIVE STYLECROSS RECESS TYPE 1
SCREW MATERIALCOPPER ALLOY
HEAD HEIGHT0.067 INCHES MINIMUM AND 0.078 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
NONDEFINITIVE SPEC/STD DATA1 TYPE AND 1S STYLE
HEAD STYLEROUND
FASTENER LENGTH0.156 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN
SCREW MATERIAL DOCUMENT AND CLASSIFICATIONQQ-B-613 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-B-626 FED SPEC SINGLE MATERIAL RESPONSE OR QQ-W-321 FED SPEC SINGLE MATERIAL RESPONSE
THREAD LENGTH0.146 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
3910Interchangeable
interchangeable cross-reference
interchangeable
M83248/2-910ESInterchangeable
interchangeable cross-reference
interchangeable
D50-0010 ITEM 3Interchangeable
interchangeable cross-reference
interchangeable
ARP568-910Interchangeable
interchangeable cross-reference
interchangeable
S425-500Interchangeable
interchangeable cross-reference
interchangeable
A-A-59282Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 421721?
421721 is a SCREW,MACHINE.
What parts can replace 421721?
There are 18 known substitutes for 421721: 3910, M83248/2-910ES, D50-0010 ITEM 3 and 15 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 421721?
421721 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-042-1721. This indicates validated use in U.S. government and defense supply chains.
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