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NAS1741-3R20 — Technical Data Sheet

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— · 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,CAP,SOCKET HEAD is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4140 OR STEEL COMP E4340 OR STEEL COMP 6150 OR STEEL COMP 8735 OR STEEL COMP 8740 OVERALL, head_style: FLAT COUNTERSUNK, thread_class: 3A A, head_diameter: 0.322 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN, thread_length: 1.092 INCHES MINIMUM AND 1.186 INCHES MAXIMUM IN, surface_finish: 32.0 MICROINCHES THREADS. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-001-9768, 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
NAS1741-3R20
NSN: 5305-00-001-9768
FSC: 5305
CAGE: 80205 — NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE (USA)
SPECIFICATIONS
materialSTEEL COMP 4140 OR STEEL COMP E4340 OR STEEL COMP 6150 OR STEEL COMP 8735 OR STEEL COMP 8740 OVERALL
head_styleFLAT COUNTERSUNK
thread_class3A A
head_diameter0.322 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
thread_length1.092 INCHES MINIMUM AND 1.186 INCHES MAXIMUM IN
surface_finish32.0 MICROINCHES THREADS
fastener_length1.234 INCHES MINIMUM AND 1.266 INCHES MAXIMUM IN
hardness_rating34.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL
locking_featurePATCH THREADS
thread_directionRIGHT-HAND
countersink_angle99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
surface_treatmentCADMIUM AND CHROMATE OVERALL
NSN5305-00-001-9768
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: NAS1741-3R20 · 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
•
SURFACE FINISH: 32.0 MICROINCHES BEARING SURFACE OF HEAD
•
HEAD STYLE: FLAT COUNTERSUNK
•
FASTENER LENGTH: 1.234 INCHES MINIMUM AND 1.266 INCHES MAXIMUM IN
•
THREAD CLASS: 3A A
•
LOCKING FEATURE: PATCH THREADS
•
NOMINAL THREAD DIAMETER: 0.190 INCHES IN
•
MATERIAL: STEEL COMP 4140 OR STEEL COMP E4340 OR STEEL COMP 6150 OR STEEL COMP 8735 OR STEEL COMP 8740 OVERALL
•
HEAD DIAMETER: 0.322 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE FINISH32.0 MICROINCHES BEARING SURFACE OF HEAD
HEAD STYLEFLAT COUNTERSUNK
FASTENER LENGTH1.234 INCHES MINIMUM AND 1.266 INCHES MAXIMUM IN
THREAD CLASS3A A
LOCKING FEATUREPATCH THREADS
NOMINAL THREAD DIAMETER0.190 INCHES IN
MATERIALSTEEL COMP 4140 OR STEEL COMP E4340 OR STEEL COMP 6150 OR STEEL COMP 8735 OR STEEL COMP 8740 OVERALL
HEAD DIAMETER0.322 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
MINIMUM TENSILE STRENGTH160000 POUNDS PER SQUARE INCH LBS
THREAD LENGTH1.092 INCHES MINIMUM AND 1.186 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 1
HT4036-4-25Same_fsc
same_fsc cross-reference
same_fsc
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is NAS1741-3R20?
NAS1741-3R20 is a SCREW,CAP,SOCKET HEAD.
What parts can replace NAS1741-3R20?
There is 1 known substitute for NAS1741-3R20: HT4036-4-25. Substitute compatibility should be verified for your specific system.
What is the NSN for NAS1741-3R20?
NAS1741-3R20 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-001-9768. 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: September 2026