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2057S128 — BOLT,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

2057S128: BOLT,SHOULDER.

The BOLT,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL COMP 8740 OVERALL, head_style: DEE CHAMFER, head_height: 0.190 INCHES MINIMUM AND 0.200 INCHES MAXIMUM IN, thread_class: 2A A, head_diameter: 0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN, thread_length: 0.590 INCHES MINIMUM AND 0.630 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-620-7328, 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
2057S128
NSN: 5306-00-620-7328
FSC: 5306 — Bolts
CAGE: 0AHP5 — CURTISS-WRIGHT CONTROLS, INC. DIV ACTUATION DIVISION (USA)
SPECIFICATIONS
materialSTEEL COMP 8740 OVERALL
head_styleDEE CHAMFER
head_height0.190 INCHES MINIMUM AND 0.200 INCHES MAXIMUM IN
thread_class2A A
head_diameter0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN
thread_length0.590 INCHES MINIMUM AND 0.630 INCHES MAXIMUM IN
shoulder_shapeROUND ALL SHOULDERS
fastener_length1.480 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN
hardness_rating26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
shoulder_length0.355 INCHES MINIMUM AND 0.395 INCHES MAXIMUM SECOND SHOULDER IN
thread_directionRIGHT-HAND
shoulder_diameter0.400 INCHES MINIMUM AND 0.401 INCHES MAXIMUM ALL SHOULDERS IN
NSN5306-00-620-7328
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 2057S128 · 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: 0.190 INCHES MINIMUM AND 0.200 INCHES MAXIMUM IN
•
FASTENER LENGTH: 1.480 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN
•
SHOULDER LENGTH: 0.355 INCHES MINIMUM AND 0.395 INCHES MAXIMUM SECOND SHOULDER IN
•
DISTANCE FROM CENTERLINE TO FLAT: 0.240 INCHES MINIMUM AND 0.244 INCHES MAXIMUM IN
•
SHOULDER DIAMETER: 0.400 INCHES MINIMUM AND 0.401 INCHES MAXIMUM ALL SHOULDERS IN
•
THREAD LENGTH: 0.590 INCHES MINIMUM AND 0.630 INCHES MAXIMUM IN
•
SHOULDER SHAPE: ROUND ALL SHOULDERS
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.190 INCHES MINIMUM AND 0.200 INCHES MAXIMUM IN
FASTENER LENGTH1.480 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN
SHOULDER LENGTH0.355 INCHES MINIMUM AND 0.395 INCHES MAXIMUM SECOND SHOULDER IN
SHOULDER LENGTH0.405 INCHES MINIMUM AND 0.415 INCHES MAXIMUM FIRST SHOULDER IN
DISTANCE FROM CENTERLINE TO FLAT0.240 INCHES MINIMUM AND 0.244 INCHES MAXIMUM IN
SHOULDER DIAMETER0.400 INCHES MINIMUM AND 0.401 INCHES MAXIMUM ALL SHOULDERS IN
THREAD LENGTH0.590 INCHES MINIMUM AND 0.630 INCHES MAXIMUM IN
SHOULDER SHAPEROUND ALL SHOULDERS
HARDNESS RATING26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 6322 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
OTHER ITEMS IN FSC 5306 — Bolts
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5306-00-004-7044 5306-00-007-6129 5306-00-008-7899 5306-00-009-4739 5306-00-118-7332 5306-00-151-1777 5306-00-255-4507 5306-01-101-2459
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 2057S128?
2057S128 is a BOLT,SHOULDER.
What is the NSN for 2057S128?
2057S128 is cataloged in the U.S. Government catalog under NSN 5306-00-620-7328. 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.