PartsTable
Technical Data Sheet
91251A720 ✓ 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,CAP,SOCKET HEAD is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: FLAT CHAMFER, head_height: 0.492 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 0.735 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN, thread_length: 1.500 INCHES MINIMUM 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 5305-00-427-6750, 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
91251A720
NSN: 5305-00-427-6750
FSC: 5305
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleFLAT CHAMFER
head_height0.492 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
thread_class3A A
head_diameter0.735 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
thread_length1.500 INCHES MINIMUM IN
fastener_length1.960 INCHES MINIMUM AND 2.000 INCHES MAXIMUM IN
hardness_rating38.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL
special_featuresFINISH COLOR BLACK
thread_directionRIGHT-HAND
surface_treatmentCADMIUM AND CHROMATE OVERALL
width_across_flats0.375 INCHES MINIMUM AND 0.379 INCHES MAXIMUM IN
NSN5305-00-427-6750
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 91251A720 · 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
HARDNESS RATING: 38.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL
THREAD DIRECTION: RIGHT-HAND
NOMINAL THREAD DIAMETER: 0.500 INCHES IN
SPECIFICATION/STANDARD DATA: 80205-NAS1351 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
MATERIAL: STEEL OVERALL
MINIMUM YIELD STRENGTH: 155000 POUNDS PER SQUARE INCH LBS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 2 FED SPEC ALL TREATMENT RESPONSES OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
HARDNESS RATING38.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD DIAMETER0.500 INCHES IN
SPECIFICATION/STANDARD DATA80205-NAS1351 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
MATERIALSTEEL OVERALL
SPECIAL FEATURESFINISH COLOR BLACK
MINIMUM YIELD STRENGTH155000 POUNDS PER SQUARE INCH LBS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 2 FED SPEC ALL TREATMENT RESPONSES OVERALL
THREAD SERIES DESIGNATORUNRC
THREAD LENGTH1.500 INCHES MINIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
528078Interchangeable
interchangeable cross-reference
interchangeable
IN4001Interchangeable
interchangeable cross-reference
interchangeable
1N4001Interchangeable
interchangeable cross-reference
interchangeable
0482-0026Interchangeable
interchangeable cross-reference
interchangeable
27183Interchangeable
interchangeable cross-reference
interchangeable
149 ITEM 77Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 91251A720?
91251A720 is a SCREW,CAP,SOCKET HEAD.
What parts can replace 91251A720?
There are 16 known substitutes for 91251A720: 528078, IN4001, 1N4001 and 13 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 91251A720?
91251A720 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-427-6750. This indicates validated use in U.S. government and defense supply chains.
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