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NAS1957C-21 — BOLT,SHEAR

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

NAS1957C-21: BOLT,SHEAR.

The BOLT,SHEAR is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4140 OR STEEL COMP 4340 OR STEEL COMP 8740 OR STEEL COMP 6150 OVERALL, head_style: HEXAGON, grip_length: 1.896 INCHES MINIMUM AND 1.916 INCHES MAXIMUM IN, head_height: 0.219 INCHES MINIMUM AND 0.234 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.436 INCHES MINIMUM AND 0.437 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-698-0480, 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
NAS1957C-21
NSN: 5306-01-698-0480
FSC: 5306 — Bolts
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 4340 OR STEEL COMP 8740 OR STEEL COMP 6150 OVERALL
head_styleHEXAGON
grip_length1.896 INCHES MINIMUM AND 1.916 INCHES MAXIMUM IN
head_height0.219 INCHES MINIMUM AND 0.234 INCHES MAXIMUM IN
thread_class3A A
grip_diameter0.436 INCHES MINIMUM AND 0.437 INCHES MAXIMUM IN
thread_length0.594 INCHES NOMINAL IN
fastener_length2.544 INCHES MINIMUM AND 2.564 INCHES MAXIMUM IN
hardness_rating39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
features_providedFLAT WASHER
surface_treatmentCADMIUM OVERALL
NSN5306-01-698-0480
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: NAS1957C-21 · 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: 0.219 INCHES MINIMUM AND 0.234 INCHES MAXIMUM IN
•
FASTENER LENGTH: 2.544 INCHES MINIMUM AND 2.564 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416 TYPE II CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 0.594 INCHES NOMINAL IN
•
HARDNESS RATING: 39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS6382 ASSN STD 1ST MATERIAL RESPONSE OR AMS6349 ASSN STD 2ND MATERIAL RESPONSE OR AMS6415 ASSN STD 3RD MATERIAL RESPONSE OR AMS6484 ASSN STD 4TH MATERIAL RESPONSE OR AMS6484 ASSN STD 5TH MATERIAL RESPONSE OR AMS6322 ASSN STD 6TH MATERIAL RESPONSE OR AMS6325 ASSN STD 7TH MATERIAL RESPONSE OR AMS6327 ASSN STD 8TH MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.4375 INCHES IN
•
FEATURES PROVIDED: FLAT WASHER
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.219 INCHES MINIMUM AND 0.234 INCHES MAXIMUM IN
FASTENER LENGTH2.544 INCHES MINIMUM AND 2.564 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416 TYPE II CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH0.594 INCHES NOMINAL IN
HARDNESS RATING39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONAMS6382 ASSN STD 1ST MATERIAL RESPONSE OR AMS6349 ASSN STD 2ND MATERIAL RESPONSE OR AMS6415 ASSN STD 3RD MATERIAL RESPONSE OR AMS6484 ASSN STD 4TH MATERIAL RESPONSE OR AMS6484 ASSN STD 5TH MATERIAL RESPONSE OR AMS6322 ASSN STD 6TH MATERIAL RESPONSE OR AMS6325 ASSN STD 7TH MATERIAL RESPONSE OR AMS6327 ASSN STD 8TH MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.4375 INCHES IN
FEATURES PROVIDEDFLAT WASHER
HEAD STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
OTHER ITEMS IN FSC 5306 — Bolts
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5306-00-001-1276 5306-00-001-1949 5306-00-001-1988 5306-00-001-1989 5306-00-001-1990 5306-00-001-1991 5306-00-001-1993 5306-00-001-2017
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is NAS1957C-21?
NAS1957C-21 is a BOLT,SHEAR.
What is the NSN for NAS1957C-21?
NAS1957C-21 is cataloged in the U.S. Government catalog under NSN 5306-01-698-0480. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.