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MBEU-66538-2 — BOLT,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

MBEU-66538-2: BOLT,MACHINE.

The BOLT,MACHINE is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, head_style: HEXAGONHEXAGON, head_height: 0.125 INCHES MINIMUM AND 0.125 INCHES MINIMUM AND 0.140 INCHES MAXIMUM0.140 INCHES MAXIMUM IN, thread_class: 2A2A, thread_length: 0.280 INCHES NOMINAL0.280 INCHES NOMINAL IN, fastener_length: 0.780 INCHES NOMINAL0.780 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-135-1122, 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
MBEU-66538-2
NSN: 5306-01-135-1122
FSC: 5306 — Bolts
CAGE: U1604 — MARTIN-BAKER AIRCRAFT COMPANY LIMITED (GBR)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
head_styleHEXAGONHEXAGON
head_height0.125 INCHES MINIMUM AND 0.125 INCHES MINIMUM AND 0.140 INCHES MAXIMUM0.140 INCHES MAXIMUM IN
thread_class2A2A
thread_length0.280 INCHES NOMINAL0.280 INCHES NOMINAL IN
fastener_length0.780 INCHES NOMINAL0.780 INCHES NOMINAL IN
thread_directionRIGHT-HANDRIGHT-HAND
surface_treatmentPASSIVATE OVERALLPASSIVATE OVERALL
askewed_head_angle90.0 DEGREES NOMINAL90.0 DEGREES NOMINAL
width_between_flats0.430 INCHES MINIMUM AND 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM0.439 INCHES MAXIMUM IN
nominal_thread_diameter0.250 INCHES0.250 INCHES IN
minimum_tensile_strength80000 POUNDS PER SQUARE INCH80000 POUNDS PER SQUARE INCH LBS
NSN5306-01-135-1122
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MBEU-66538-2 · 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: 0.125 INCHES MINIMUM AND 0.125 INCHES MINIMUM AND 0.140 INCHES MAXIMUM0.140 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.780 INCHES NOMINAL0.780 INCHES NOMINAL IN
•
THREAD LENGTH: 0.280 INCHES NOMINAL0.280 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.250 INCHES0.250 INCHES IN
•
HEAD STYLE: HEXAGONHEXAGON
•
THREAD DIRECTION: RIGHT-HANDRIGHT-HAND
•
WIDTH BETWEEN FLATS: 0.430 INCHES MINIMUM AND 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM0.439 INCHES MAXIMUM IN
•
ASKEWED HEAD ANGLE: 90.0 DEGREES NOMINAL90.0 DEGREES NOMINAL
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.125 INCHES MINIMUM AND 0.125 INCHES MINIMUM AND 0.140 INCHES MAXIMUM0.140 INCHES MAXIMUM IN
FASTENER LENGTH0.780 INCHES NOMINAL0.780 INCHES NOMINAL IN
THREAD LENGTH0.280 INCHES NOMINAL0.280 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.250 INCHES0.250 INCHES IN
HEAD STYLEHEXAGONHEXAGON
THREAD DIRECTIONRIGHT-HANDRIGHT-HAND
WIDTH BETWEEN FLATS0.430 INCHES MINIMUM AND 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM0.439 INCHES MAXIMUM IN
ASKEWED HEAD ANGLE90.0 DEGREES NOMINAL90.0 DEGREES NOMINAL
SURFACE TREATMENTPASSIVATE OVERALLPASSIVATE OVERALL
MINIMUM TENSILE STRENGTH80000 POUNDS PER SQUARE INCH80000 POUNDS PER SQUARE INCH LBS
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 MBEU-66538-2?
MBEU-66538-2 is a BOLT,MACHINE.
What is the NSN for MBEU-66538-2?
MBEU-66538-2 is cataloged in the U.S. Government catalog under NSN 5306-01-135-1122. 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.