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A51L21066-29 — CLAMP,BLOCK,SECTION

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

A51L21066-29: CLAMP,BLOCK,SECTION.

The CLAMP,BLOCK,SECTION is a the manufacturer industrial component. Key specifications include material: PLASTIC OR PLASTIC PHENOLIC, block_height: 0.375 INCHES NOMINAL0.375 INCHES NOMINAL IN, overall_width: 0.380 INCHES NOMINAL0.380 INCHES NOMINAL IN, overall_length: 4.000 INCHES NOMINAL4.000 INCHES NOMINAL IN, style_designator: RECTANGULAR, mounting_facility: UNTHREADED HOLE(S)UNTHREADED HOLE(S). This part is cataloged in the U.S.

Government catalog under NSN 5340-01-309-4371, 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
A51L21066-29
NSN: 5340-01-309-4371
FSC: 5340 — Hardware, Commercial
CAGE: 79RG9 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialPLASTIC OR PLASTIC PHENOLIC
block_height0.375 INCHES NOMINAL0.375 INCHES NOMINAL IN
overall_width0.380 INCHES NOMINAL0.380 INCHES NOMINAL IN
overall_length4.000 INCHES NOMINAL4.000 INCHES NOMINAL IN
style_designatorRECTANGULAR
mounting_facilityUNTHREADED HOLE(S)UNTHREADED HOLE(S)
clamping_hole_diameter0.500 INCHES MINIMUM AND 0.504 INCHES MAXIMUM ALL HOLES IN
clamping_hole_quantity44
mounting_hole_diameter0.190 INCHES MINIMUM AND 0.190 INCHES MINIMUM AND 0.196 INCHES MAXIMUM0.196 INCHES MAXIMUM IN
mounting_hole_quantity33
material_document_and_classificationMIL-P-15035,TYPE FBM MIL SPEC 2ND MATERIAL RESPONSE
distance_from_end_to_first_clamping_hole_center0.742 INCHES NOMINAL IN
NSN5340-01-309-4371
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: A51L21066-29 MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
MOUNTING HOLE QUANTITY: 33
•
CLAMPING HOLE QUANTITY: 44
•
CENTER TO CENTER DISTANCE BETWEEN FIRST AND FOURTH CLAMPING HOLES: 2.508 INCHES NOMINAL IN
•
DISTANCE FROM END TO FIRST CLAMPING HOLE CENTER: 0.742 INCHES NOMINAL IN
•
BLOCK HEIGHT: 0.375 INCHES NOMINAL0.375 INCHES NOMINAL IN
•
STYLE DESIGNATOR: RECTANGULAR
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-P-15035,TYPE FBM MIL SPEC 2ND MATERIAL RESPONSE
•
MOUNTING HOLE DIAMETER: 0.190 INCHES MINIMUM AND 0.190 INCHES MINIMUM AND 0.196 INCHES MAXIMUM0.196 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
MOUNTING HOLE QUANTITY33
CLAMPING HOLE QUANTITY44
CENTER TO CENTER DISTANCE BETWEEN FIRST AND FOURTH CLAMPING HOLES2.508 INCHES NOMINAL IN
DISTANCE FROM END TO FIRST CLAMPING HOLE CENTER0.742 INCHES NOMINAL IN
BLOCK HEIGHT0.375 INCHES NOMINAL0.375 INCHES NOMINAL IN
STYLE DESIGNATORRECTANGULAR
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-P-15035,TYPE FBM MIL SPEC 2ND MATERIAL RESPONSE
MOUNTING HOLE DIAMETER0.190 INCHES MINIMUM AND 0.190 INCHES MINIMUM AND 0.196 INCHES MAXIMUM0.196 INCHES MAXIMUM IN
OVERALL LENGTH4.000 INCHES NOMINAL4.000 INCHES NOMINAL IN
CENTER TO CENTER DISTANCE BETWEEN FIRST AND THIRD MOUNTING HOLES3.500 INCHES NOMINAL3.500 INCHES NOMINAL IN
OTHER ITEMS IN FSC 5340 — Hardware, Commercial
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5340-00-000-0068 5340-00-000-0132 5340-00-000-8150 5340-00-001-1251 5340-00-001-1264 5340-00-001-1265 5340-00-001-1266 5340-00-001-1275
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

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 A51L21066-29?
A51L21066-29 is a CLAMP,BLOCK,SECTION.
What is the NSN for A51L21066-29?
A51L21066-29 is cataloged in the U.S. Government catalog under NSN 5340-01-309-4371. 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.