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BACB30MT8T-21Y — BOLT,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

BACB30MT8T-21Y: BOLT,SHOULDER.

The BOLT,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL COMP H11 OVERALL, head_style: DOUBLE HEXAGON W/HOLE, head_height: 0.494 INCHES MINIMUM AND 0.514 INCHES MAXIMUM IN, thread_class: 3A A, thread_length: 0.788 INCHES MINIMUM AND 0.838 INCHES MAXIMUM IN, shoulder_shape: ROUND FIRST SHOULDER. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-231-5896, 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
BACB30MT8T-21Y
NSN: 5306-01-231-5896
FSC: 5306 — Bolts
CAGE: 81205 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialSTEEL COMP H11 OVERALL
head_styleDOUBLE HEXAGON W/HOLE
head_height0.494 INCHES MINIMUM AND 0.514 INCHES MAXIMUM IN
thread_class3A A
thread_length0.788 INCHES MINIMUM AND 0.838 INCHES MAXIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length2.110 INCHES MINIMUM AND 2.140 INCHES MAXIMUM IN
hardness_rating46.0 ROCKWELL C MINIMUM AND 49.0 ROCKWELL C MAXIMUM OVERALL
shoulder_length1.302 INCHES MINIMUM AND 1.322 INCHES MAXIMUM FIRST SHOULDER IN
thread_directionRIGHT-HAND
shoulder_diameter0.5297 INCHES MINIMUM AND 0.5307 INCHES MAXIMUM FIRST SHOULDER IN
surface_treatmentNICKEL AND CADMIUM AND CHROMATE OVERALL
NSN5306-01-231-5896
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: BACB30MT8T-21Y · 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: 0.113 INCHES MINIMUM AND 0.133 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.494 INCHES MINIMUM AND 0.514 INCHES MAXIMUM IN
•
FASTENER LENGTH: 2.110 INCHES MINIMUM AND 2.140 INCHES MAXIMUM IN
•
SHOULDER LENGTH: 1.302 INCHES MINIMUM AND 1.322 INCHES MAXIMUM FIRST SHOULDER IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: BPS-F-69,CLASS 220FA6 MFR REF ALL TREATMENT RESPONSES OVERALL
•
EXTENDED WASHER DIAMETER: 0.818 INCHES MINIMUM AND 0.828 INCHES MAXIMUM IN
•
SHOULDER DIAMETER: 0.5297 INCHES MINIMUM AND 0.5307 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD LENGTH: 0.788 INCHES MINIMUM AND 0.838 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
EXTENDED WASHER THICKNESS0.113 INCHES MINIMUM AND 0.133 INCHES MAXIMUM IN
HEAD HEIGHT0.494 INCHES MINIMUM AND 0.514 INCHES MAXIMUM IN
FASTENER LENGTH2.110 INCHES MINIMUM AND 2.140 INCHES MAXIMUM IN
SHOULDER LENGTH1.302 INCHES MINIMUM AND 1.322 INCHES MAXIMUM FIRST SHOULDER IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONBPS-F-69,CLASS 220FA6 MFR REF ALL TREATMENT RESPONSES OVERALL
EXTENDED WASHER DIAMETER0.818 INCHES MINIMUM AND 0.828 INCHES MAXIMUM IN
SHOULDER DIAMETER0.5297 INCHES MINIMUM AND 0.5307 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH0.788 INCHES MINIMUM AND 0.838 INCHES MAXIMUM IN
SHOULDER SHAPEROUND FIRST SHOULDER
HARDNESS RATING46.0 ROCKWELL C MINIMUM AND 49.0 ROCKWELL C MAXIMUM 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
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is BACB30MT8T-21Y?
BACB30MT8T-21Y is a BOLT,SHOULDER.
What is the NSN for BACB30MT8T-21Y?
BACB30MT8T-21Y is cataloged in the U.S. Government catalog under NSN 5306-01-231-5896. 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.