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121256 — MICROCIRCUIT,DIGITAL

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

121256: MICROCIRCUIT,DIGITAL.

The MICROCIRCUIT,DIGITAL is a the manufacturer industrial component. Key specifications include material: RUBBER OVERALL, head_style: KNURLED NO. 4, head_height: 0.219 INCHES NOMINAL IN, thread_class: 2A A, head_diameter: 0.515 INCHES NOMINAL IN, hole_diameter: 0.281 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN.

This part is cataloged in the U.S. Government catalog under NSN 5306-00-483-9743, 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
121256
NSN: 5306-00-483-9743
NIINs: 004839743, 005592890, 010481411, 014428607
FSC: 5306 — Bolts
CAGE: 95270 — SKURKA AEROSPACE INC (USA)
SPECIFICATIONS
materialRUBBER OVERALL
head_styleKNURLED NO. 4
head_height0.219 INCHES NOMINAL IN
thread_class2A A
head_diameter0.515 INCHES NOMINAL IN
hole_diameter0.281 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
overall_width3.000 INCHES NOMINAL IN
thread_length0.239 INCHES NOMINAL IN
overall_length3.000 INCHES NOMINAL IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length2.506 INCHES NOMINAL IN
hardness_rating44.0 ROCKWELL C MINIMUM AND 46.0 ROCKWELL C MAXIMUM OVERALL
NSN5306-00-483-9743
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 121256 · 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: 0.219 INCHES NOMINAL IN
•
FASTENER LENGTH: 2.506 INCHES NOMINAL IN
•
SHOULDER LENGTH: 2.225 INCHES NOMINAL FIRST SHOULDER IN
•
SHOULDER DIAMETER: 0.281 INCHES NOMINAL FIRST SHOULDER IN
•
THREAD LENGTH: 0.239 INCHES NOMINAL IN
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
•
HARDNESS RATING: 44.0 ROCKWELL C MINIMUM AND 46.0 ROCKWELL C MAXIMUM OVERALL
•
SHANK UNTHREADED HOLE DIAMETER: 0.070 INCHES NOMINAL FIRST HOLE IN
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.219 INCHES NOMINAL IN
FASTENER LENGTH2.506 INCHES NOMINAL IN
SHOULDER LENGTH2.225 INCHES NOMINAL FIRST SHOULDER IN
SHOULDER DIAMETER0.281 INCHES NOMINAL FIRST SHOULDER IN
THREAD LENGTH0.239 INCHES NOMINAL IN
SHOULDER SHAPEROUND FIRST SHOULDER
HARDNESS RATING44.0 ROCKWELL C MINIMUM AND 46.0 ROCKWELL C MAXIMUM OVERALL
SHANK UNTHREADED HOLE DIAMETER0.070 INCHES NOMINAL FIRST HOLE IN
NOMINAL THREAD DIAMETER0.216 INCHES IN
HEAD STYLEKNURLED NO. 4
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 121256?
121256 is a MICROCIRCUIT,DIGITAL.
What is the NSN for 121256?
121256 is cataloged in the U.S. Government catalog under NSN 5306-00-483-9743. 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.