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MB161-8-61 — BOLT,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

MB161-8-61: BOLT,SHOULDER.

The BOLT,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL COMP XM-13 OVERALL, head_style: SPLINE EXTENDED WASHER, head_height: 0.440 INCHES MINIMUM AND 0.460 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 5306-01-142-9899, 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
MB161-8-61
NSN: 5306-01-142-9899
FSC: 5306 — Bolts
CAGE: L4528 — LISI AEROSPACE CANADA CORP DIV HI SHEAR HOLDINGS INC (CAN)
SPECIFICATIONS
materialSTEEL COMP XM-13 OVERALL
head_styleSPLINE EXTENDED WASHER
head_height0.440 INCHES MINIMUM AND 0.460 INCHES MAXIMUM IN
thread_class3A A
thread_length0.742 INCHES MINIMUM AND 0.792 INCHES MAXIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length4.565 INCHES MINIMUM AND 4.595 INCHES MAXIMUM IN
shoulder_length3.802 INCHES MINIMUM AND 3.822 INCHES MAXIMUM FIRST SHOULDER IN
thread_directionRIGHT-HAND
shoulder_diameter0.5146 INCHES MINIMUM AND 0.5151 INCHES MAXIMUM FIRST SHOULDER IN
surface_treatmentPASSIVATE OVERALL
head_minor_diameter0.644 INCHES MINIMUM AND 0.651 INCHES MAXIMUM IN
NSN5306-01-142-9899
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MB161-8-61 · 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: 0.062 INCHES MINIMUM AND 0.082 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.440 INCHES MINIMUM AND 0.460 INCHES MAXIMUM IN
•
FASTENER LENGTH: 4.565 INCHES MINIMUM AND 4.595 INCHES MAXIMUM IN
•
SHOULDER LENGTH: 3.802 INCHES MINIMUM AND 3.822 INCHES MAXIMUM FIRST SHOULDER IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
EXTENDED WASHER DIAMETER: 0.922 INCHES MINIMUM AND 0.932 INCHES MAXIMUM IN
•
SHOULDER DIAMETER: 0.5146 INCHES MINIMUM AND 0.5151 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD LENGTH: 0.742 INCHES MINIMUM AND 0.792 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
EXTENDED WASHER THICKNESS0.062 INCHES MINIMUM AND 0.082 INCHES MAXIMUM IN
HEAD HEIGHT0.440 INCHES MINIMUM AND 0.460 INCHES MAXIMUM IN
FASTENER LENGTH4.565 INCHES MINIMUM AND 4.595 INCHES MAXIMUM IN
SHOULDER LENGTH3.802 INCHES MINIMUM AND 3.822 INCHES MAXIMUM FIRST SHOULDER IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
EXTENDED WASHER DIAMETER0.922 INCHES MINIMUM AND 0.932 INCHES MAXIMUM IN
SHOULDER DIAMETER0.5146 INCHES MINIMUM AND 0.5151 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 1
VS3190-8-61XReference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is MB161-8-61?
MB161-8-61 is a BOLT,SHOULDER.
What parts can replace MB161-8-61?
There is 1 known substitute for MB161-8-61: VS3190-8-61X. Substitute compatibility should be verified for your specific system.
What is the NSN for MB161-8-61?
MB161-8-61 is cataloged in the U.S. Government catalog under NSN 5306-01-142-9899. 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.