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MMD-1687 — PLATE,MOUNTING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

MMD-1687: PLATE,MOUNTING.

The PLATE,MOUNTING is a the manufacturer industrial component. Key specifications include width: 2.500 INCHES NOMINAL2.500 INCHES NOMINAL IN, length: 6.500 INCHES NOMINAL6.500 INCHES NOMINAL IN, material: STEEL COMP 304, thickness: 0.250 INCHES NOMINAL0.250 INCHES NOMINAL IN, special_features: SHAPE:RECTANGLE, mounting_hole_type: UNTHREADED. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-553-6993, 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
MMD-1687
NSN: 5340-01-553-6993
FSC: 5340 — Hardware, Commercial
CAGE: 70433 — APPLETON MARINE INC (USA)
SPECIFICATIONS
width2.500 INCHES NOMINAL2.500 INCHES NOMINAL IN
length6.500 INCHES NOMINAL6.500 INCHES NOMINAL IN
materialSTEEL COMP 304
thickness0.250 INCHES NOMINAL0.250 INCHES NOMINAL IN
special_featuresSHAPE:RECTANGLE
mounting_hole_typeUNTHREADED
mounting_hole_diameter0.690 INCHES NOMINAL ALL HOLES IN
mounting_hole_quantity2
end_item_identificationCRANE ASSY FLDG BOOM FB30-27
part_name_assigned_by_controlling_agency(DRAWING)LOCKPLATE(MMD-1627)
NSN5340-01-553-6993
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MMD-1687 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: 2
•
LENGTH: 6.500 INCHES NOMINAL6.500 INCHES NOMINAL IN
•
MOUNTING HOLE DIAMETER: 0.690 INCHES NOMINAL ALL HOLES IN
•
WIDTH: 2.500 INCHES NOMINAL2.500 INCHES NOMINAL IN
•
MATERIAL: STEEL COMP 304
TECHNICAL CHARACTERISTICS
MOUNTING HOLE QUANTITY2
LENGTH6.500 INCHES NOMINAL6.500 INCHES NOMINAL IN
MOUNTING HOLE DIAMETER0.690 INCHES NOMINAL ALL HOLES IN
SPECIAL FEATURESSHAPE:RECTANGLE
WIDTH2.500 INCHES NOMINAL2.500 INCHES NOMINAL IN
PART NAME ASSIGNED BY CONTROLLING AGENCY(DRAWING)LOCKPLATE(MMD-1627)
END ITEM IDENTIFICATIONCRANE ASSY FLDG BOOM FB30-27
MATERIALSTEEL COMP 304
THICKNESS0.250 INCHES NOMINAL0.250 INCHES NOMINAL IN
MOUNTING HOLE TYPEUNTHREADED
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 1
AMD-1740 ITEM 42Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 MMD-1687?
MMD-1687 is a PLATE,MOUNTING.
What parts can replace MMD-1687?
There is 1 known substitute for MMD-1687: AMD-1740 ITEM 42. Substitute compatibility should be verified for your specific system.
What is the NSN for MMD-1687?
MMD-1687 is cataloged in the U.S. Government catalog under NSN 5340-01-553-6993. 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.