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A12987 — CIRCUIT BREAKER SUBASSEMBLY

✓ Government record, cited
— · MRO · MRO_GENERAL
PRODUCT OVERVIEW

A12987: CIRCUIT BREAKER SUBASSEMBLY.

The CIRCUIT BREAKER SUBASSEMBLY is a the manufacturer industrial component. Key specifications include material: WOOL OVERALL, thickness: 0.156 INCHES NOMINAL IN, hole_diameter: 1.344 INCHES NOMINAL IN, overall_diameter: 1.812 INCHES NOMINAL IN, special_features: MAJOR COMPONENTS:CONNECTOR 1,CIRCUIT BREAKER 1,CABLE WIRE 2,METAL SWITCH GUARD 1;, peripheral_shape_style: ROUND. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-501-2987, 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
MRO→ MRO_GENERAL→ A12987
NSN: 5310-00-501-2987
NIINs: 005012987, 013492226
FSC: 5310 — Nuts and Washers
CAGE: 00000
SPECIFICATIONS
materialWOOL OVERALL
thickness0.156 INCHES NOMINAL IN
hole_diameter1.344 INCHES NOMINAL IN
overall_diameter1.812 INCHES NOMINAL IN
special_featuresMAJOR COMPONENTS:CONNECTOR 1,CIRCUIT BREAKER 1,CABLE WIRE 2,METAL SWITCH GUARD 1;
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
NSN5310-00-501-2987
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: A12987 · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
OVERALL DIAMETER: 1.812 INCHES NOMINAL IN
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: WOOL OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
•
HOLE DIAMETER: 1.344 INCHES NOMINAL IN
•
THICKNESS: 0.156 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER1.812 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
SPECIAL FEATURESMILDREW PROOFED IN ACCORD/W MIL-T-2312
PERIPHERAL SHAPE STYLEROUND
MATERIALWOOL OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER1.344 INCHES NOMINAL IN
THICKNESS0.156 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 1
A033-501-2987Reference document
Same NSN cross-reference
Reference document — Informative reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is A12987?
A12987 is a CIRCUIT BREAKER SUBASSEMBLY. It is classified as a MRO (MRO_GENERAL).
What parts can replace A12987?
There is 1 known substitute for A12987: A033-501-2987. Substitute compatibility should be verified for your specific system.
What is the NSN for A12987?
A12987 is cataloged in the U.S. Government catalog under NSN 5310-00-501-2987. 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.