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MB87-8-21 — BOLT,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

MB87-8-21: BOLT,SHOULDER.

The BOLT,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL COMP XM-13 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: 0.742 INCHES MINIMUM AND 0.792 INCHES MAXIMUM IN, shoulder_shape: ROUND FIRST SHOULDER. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-207-0198, 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
MB87-8-21
NSN: 5306-01-207-0198
FSC: 5306 — Bolts
CAGE: L4528 — LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC (CAN)
SPECIFICATIONS
materialSTEEL COMP XM-13 OVERALL
head_styleDOUBLE HEXAGON W/HOLE
head_height0.494 INCHES MINIMUM AND 0.514 INCHES MAXIMUM IN
thread_class3A A
thread_length0.742 INCHES MINIMUM AND 0.792 INCHES MAXIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length2.064 INCHES MINIMUM AND 2.094 INCHES MAXIMUM IN
shoulder_length1.302 INCHES MINIMUM AND 1.322 INCHES MAXIMUM FIRST SHOULDER IN
thread_directionRIGHT-HAND
shoulder_diameter0.530 INCHES MINIMUM AND 0.531 INCHES MAXIMUM FIRST SHOULDER IN
surface_treatmentPASSIVATE OVERALL
width_between_flats0.564 INCHES NOMINAL IN
NSN5306-01-207-0198
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MB87-8-21 · 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
•
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: 2.064 INCHES MINIMUM AND 2.094 INCHES MAXIMUM IN
•
SHOULDER LENGTH: 1.302 INCHES MINIMUM AND 1.322 INCHES MAXIMUM FIRST SHOULDER IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
EXTENDED WASHER DIAMETER: 0.818 INCHES MINIMUM AND 0.828 INCHES MAXIMUM IN
•
SHOULDER DIAMETER: 0.530 INCHES MINIMUM AND 0.531 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD LENGTH: 0.742 INCHES MINIMUM AND 0.792 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 LENGTH2.064 INCHES MINIMUM AND 2.094 INCHES MAXIMUM IN
SHOULDER LENGTH1.302 INCHES MINIMUM AND 1.322 INCHES MAXIMUM FIRST SHOULDER IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
EXTENDED WASHER DIAMETER0.818 INCHES MINIMUM AND 0.828 INCHES MAXIMUM IN
SHOULDER DIAMETER0.530 INCHES MINIMUM AND 0.531 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH0.742 INCHES MINIMUM AND 0.792 INCHES MAXIMUM IN
SHOULDER SHAPEROUND FIRST SHOULDER
MATERIAL DOCUMENT AND CLASSIFICATIONAMS5629 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 6
BM3326-8-21YReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
74328-8-21YReference document
Same NSN cross-reference
Reference document — Secondary reference
S11-1063-8-21Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
VS3061-8-21Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
ST3M607-8-21Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
VAL23033-8-21XSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 MB87-8-21?
MB87-8-21 is a BOLT,SHOULDER.
What parts can replace MB87-8-21?
There are 6 known substitutes for MB87-8-21: BM3326-8-21Y, 74328-8-21Y, S11-1063-8-21 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MB87-8-21?
MB87-8-21 is cataloged in the U.S. Government catalog under NSN 5306-01-207-0198. 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.