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270821 — BOLT,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

270821: BOLT,SHOULDER.

The BOLT,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, head_style: HEXAGON EXTENDED WASHER, head_height: 0.280 INCHES MINIMUM AND 0.300 INCHES MAXIMUM IN, thread_class: 3A A, thread_length: 0.605 INCHES MINIMUM AND 0.629 INCHES MAXIMUM IN, shoulder_shape: ROUND FIRST SHOULDER. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-550-2580, 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
270821
NSN: 5306-00-550-2580
FSC: 5306 — Bolts
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
head_styleHEXAGON EXTENDED WASHER
head_height0.280 INCHES MINIMUM AND 0.300 INCHES MAXIMUM IN
thread_class3A A
thread_length0.605 INCHES MINIMUM AND 0.629 INCHES MAXIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN
hardness_rating38.0 ROCKWELL C MAXIMUM OVERALL
shoulder_length0.131 INCHES MINIMUM AND 0.135 INCHES MAXIMUM FIRST SHOULDER IN
thread_directionRIGHT-HAND
shoulder_diameter0.370 INCHES MINIMUM AND 0.390 INCHES MAXIMUM FIRST SHOULDER IN
width_between_flats0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN
NSN5306-00-550-2580
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 270821 · 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
•
EXTENDED WASHER THICKNESS: 0.090 INCHES MINIMUM AND 0.100 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.280 INCHES MINIMUM AND 0.300 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN
•
SHOULDER LENGTH: 0.131 INCHES MINIMUM AND 0.135 INCHES MAXIMUM FIRST SHOULDER IN
•
EXTENDED WASHER DIAMETER: 0.990 INCHES MINIMUM AND 1.010 INCHES MAXIMUM IN
•
SHOULDER DIAMETER: 0.370 INCHES MINIMUM AND 0.390 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD LENGTH: 0.605 INCHES MINIMUM AND 0.629 INCHES MAXIMUM IN
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
TECHNICAL CHARACTERISTICS
EXTENDED WASHER THICKNESS0.090 INCHES MINIMUM AND 0.100 INCHES MAXIMUM IN
HEAD HEIGHT0.280 INCHES MINIMUM AND 0.300 INCHES MAXIMUM IN
FASTENER LENGTH0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN
SHOULDER LENGTH0.131 INCHES MINIMUM AND 0.135 INCHES MAXIMUM FIRST SHOULDER IN
EXTENDED WASHER DIAMETER0.990 INCHES MINIMUM AND 1.010 INCHES MAXIMUM IN
SHOULDER DIAMETER0.370 INCHES MINIMUM AND 0.390 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH0.605 INCHES MINIMUM AND 0.629 INCHES MAXIMUM IN
SHOULDER SHAPEROUND FIRST SHOULDER
HARDNESS RATING38.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5616 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.
5306-00-001-1276 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 270821?
270821 is a BOLT,SHOULDER.
What is the NSN for 270821?
270821 is cataloged in the U.S. Government catalog under NSN 5306-00-550-2580. 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.