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Technical Data Sheet
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227470Y20 — BOLT,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

227470Y20: BOLT,SHOULDER.

The BOLT,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL COMP 8740 OVERALL, head_style: ROUND W/WRENCH FLATS CHAMFERED, head_height: 0.600 INCHES MINIMUM AND 0.610 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 0.990 INCHES MINIMUM AND 1.010 INCHES MAXIMUM IN, thread_length: 0.430 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-520-2761, 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
227470Y20
NSN: 5306-00-520-2761
FSC: 5306 — Bolts
CAGE: 0AHP5 — CURTISS-WRIGHT CONTROLS, INC. DIV ACTUATION DIVISION (USA)
SPECIFICATIONS
materialSTEEL COMP 8740 OVERALL
head_styleROUND W/WRENCH FLATS CHAMFERED
head_height0.600 INCHES MINIMUM AND 0.610 INCHES MAXIMUM IN
thread_class3A A
head_diameter0.990 INCHES MINIMUM AND 1.010 INCHES MAXIMUM IN
thread_length0.430 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length1.170 INCHES MINIMUM AND 1.190 INCHES MAXIMUM IN
hardness_rating26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
shoulder_length0.580 INCHES MINIMUM AND 0.610 INCHES MAXIMUM FIRST SHOULDER IN
special_featuresHEAD NOT CONCENTRIC TO THE BOLT SHANK
thread_directionRIGHT-HAND
NSN5306-00-520-2761
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 227470Y20 · 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: 0.600 INCHES MINIMUM AND 0.610 INCHES MAXIMUM IN
•
FASTENER LENGTH: 1.170 INCHES MINIMUM AND 1.190 INCHES MAXIMUM IN
•
SHOULDER LENGTH: 0.580 INCHES MINIMUM AND 0.610 INCHES MAXIMUM FIRST SHOULDER IN
•
SHOULDER DIAMETER: 0.4597 INCHES MINIMUM AND 0.4600 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD LENGTH: 0.430 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
•
HARDNESS RATING: 26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 6322 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.600 INCHES MINIMUM AND 0.610 INCHES MAXIMUM IN
FASTENER LENGTH1.170 INCHES MINIMUM AND 1.190 INCHES MAXIMUM IN
SHOULDER LENGTH0.580 INCHES MINIMUM AND 0.610 INCHES MAXIMUM FIRST SHOULDER IN
SHOULDER DIAMETER0.4597 INCHES MINIMUM AND 0.4600 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH0.430 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN
SHOULDER SHAPEROUND FIRST SHOULDER
HARDNESS RATING26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 6322 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.375 INCHES IN
HEAD STYLEROUND W/WRENCH FLATS CHAMFERED
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
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 227470Y20?
227470Y20 is a BOLT,SHOULDER.
What is the NSN for 227470Y20?
227470Y20 is cataloged in the U.S. Government catalog under NSN 5306-00-520-2761. 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.