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MIL-T-81556 — STRUCTURAL SECTION,SPECIAL SHAPE

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

MIL-T-81556: STRUCTURAL SECTION,SPECIAL SHAPE.

STRUCTURAL SECTION,SPECIAL SHAPE. Key specifications include length: 12.000 FEET NOMINAL FT, material: TITANIUM ALLOY, leg_thickness: 0.135 INCHES NOMINAL IN, overall_width: 1.900 INCHES NOMINAL IN, heat_treatment: ANNEALED, overall_height: 1.810 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 9540-01-251-0815, 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
MIL-T-81556
NSN: 9540-01-251-0815
NIINs: 012510815, 013331470, 013633402, 014268410, 014282770, 014282771, 014285985, 014289036, 014289509, 014289512, 014289515, 014289516, 014293011, 014293014, 014293015, 014301809, 014302779, 014302808, 014308895, 014348672, 014348675, 014354800, 014355244, 014355245, 014355246, 014355247, 014355248, 014355249, 014355250, 014355251, 014355252, 014355253, 014355255, 014355256, 014355258, 014355694, 014356428, 014357783, 014357787, 014358303, 014358305, 014358306, 014358307, 014358308, 014358310, 014358736, 014359130, 014359131, 014359133, 014359135, 014359136, 014359662, 014359664, 014359665, 014359669, 014363204, 014372654, 014372656, 014372659, 014374993, 014374995, 014374998, 014387984, 014387991, 014388703, 014388837, 014388884, 014388909, 014388915, 014388918, 014406242, 014406526, 014440791, 014440822, 014443319, 014444375, 014444473, 014455716, 014457866, 014457873, 014457878, 014521099, 014522630, 014522636, 014527025, 014531853, 014566379, 014595965, 014630409, 014630422, 014630425, 014630438, 014630446, 014630453, 014630460, 014630631, 014630634, 014630641
FSC: 9540 — Structural Shapes, Nonferrous Base Metal
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
length12.000 FEET NOMINAL FT
materialTITANIUM ALLOY
leg_thickness0.135 INCHES NOMINAL IN
overall_width1.900 INCHES NOMINAL IN
heat_treatmentANNEALED
overall_height1.810 INCHES NOMINAL IN
first_tip_styleSQUARE END
third_tip_styleSQUARE END
first_tip_radius0.062 INCHES NOMINAL IN
second_tip_styleUPPER RADIUS
special_featuresRADIUS WHERE LEFT FLANGE JOINS BASE FLANGE 0.250"
top_flange_width4.650 INCHES NOMINAL IN
NSN9540-01-251-0815
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available STRUCTURAL SECTION,SPECIAL SHAPE TITLE COMPONENT PN MIL-T-81556 MFR STRUCTURAL SECTION,SPE
KEY FEATURES
•
FIRST TIP INNER RADIUS: 0.090 INCHES NOMINAL IN
•
RIGHT SIDE TOP FLANGE THICKNESS: 0.350 INCHES NOMINAL IN
•
LENGTH: 10.000 FEET MINIMUM AND 12.000 FEET MAXIMUM FT
•
LEFT SIDE TOP FLANGE DISTANCE TO CENTER OF BOTH FLANGES: 0.975 INCHES NOMINAL IN
•
RIGHT TOP INSIDE ANGLE: 90.0 DEGREES NOMINAL
•
LEFT TOP INSIDE ANGLE: 90.0 DEGREES NOMINAL
•
HEAT TREATMENT: ANNEALED
TECHNICAL CHARACTERISTICS
FIRST TIP INNER RADIUS0.090 INCHES NOMINAL IN
OVERALL HEIGHT2.300 INCHES NOMINAL IN
RIGHT SIDE TOP FLANGE THICKNESS0.350 INCHES NOMINAL IN
LENGTH10.000 FEET MINIMUM AND 12.000 FEET MAXIMUM FT
LEFT SIDE TOP FLANGE DISTANCE TO CENTER OF BOTH FLANGES0.975 INCHES NOMINAL IN
RIGHT TOP INSIDE ANGLE90.0 DEGREES NOMINAL
LEFT TOP INSIDE ANGLE90.0 DEGREES NOMINAL
HEAT TREATMENTANNEALED
FILLET RADIUS WHERE TOP RIGHT FLANGE JOINS WEB FLANGE/LEG0.250 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-T-81556,TYPE 3,COMP A MIL SPEC SINGLE MATERIAL RESPONSE
OTHER ITEMS IN FSC 9540 — Structural Shapes, Nonferrous Base Metal
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
9540-00-001-5119 9540-00-001-5122 9540-00-001-5123 9540-00-001-5135 9540-00-001-6756 9540-00-003-9517 9540-00-003-9539 9540-00-004-5243
SUBSTITUTES & CROSS-REFERENCES 1
1MT360A01-10011Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — no further procurement; issued until stock is exhaustedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is MIL-T-81556?
MIL-T-81556 is a STRUCTURAL SECTION,SPECIAL SHAPE.
What parts can replace MIL-T-81556?
There is 1 known substitute for MIL-T-81556: 1MT360A01-10011. Substitute compatibility should be verified for your specific system.
What is the NSN for MIL-T-81556?
MIL-T-81556 is cataloged in the U.S. Government catalog under NSN 9540-01-251-0815. 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.