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MR57 — DIAPHRAGM,VALVE,FLAT

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

MR57: DIAPHRAGM,VALVE,FLAT.

The DIAPHRAGM,VALVE,FLAT is a the manufacturer industrial component. Key specifications include material: RUBBER SYNTHETIC, hole_diameter: 0.203 INCHES NOMINAL IN, outside_diameter: 4.844 INCHES NOMINAL IN, special_features: ONE HOLE 0.203 IN. DIA LOCATED 1.062 IN.

FROM CENTER LINE; ADDITIONAL MATERIAL: FIBER IN, style_designator: FLAT, material_thickness: 0.025 INCHES NOMINAL IN. This part is cataloged in the U.S. Government catalog under NSN 4820-00-678-0261, 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
MR57
NSN: 4820-00-678-0261
FSC: 4820 — Valves, Nonpowered
CAGE: 76376 — MECHANICAL RUBBER PRODUCTS COMPANY, INC. DBA MECHANICAL RUBBER PRDTS CO INC DIV MECHANICAL RUBBER PRODUCTS CO., INC. (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC
hole_diameter0.203 INCHES NOMINAL IN
outside_diameter4.844 INCHES NOMINAL IN
special_featuresONE HOLE 0.203 IN. DIA LOCATED 1.062 IN. FROM CENTER LINE; ADDITIONAL MATERIAL: FIBER IN
style_designatorFLAT
bolt_hole_quantity1
material_thickness0.025 INCHES NOMINAL IN
bolt_circle_diameter4.344 INCHES NOMINAL IN
center_hole_diameter0.203 INCHES NOMINAL IN
NSN4820-00-678-0261
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: MR57 · OEM ⚠ VERIFY BEFORE ORDERING Gate valves = FULL OPEN or FULL CLOSE only — never throttle. Partial opening causes seat erosion and vibration. ✓ BROKER TIP Rising stem shows valve position visually — easier maintenance. Non-rising stem saves headroom. PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
OUTSIDE DIAMETER: 4.844 INCHES NOMINAL IN
•
STYLE DESIGNATOR: FLAT
•
MATERIAL THICKNESS: 0.025 INCHES NOMINAL IN
•
BOLT HOLE QUANTITY: 1
•
BOLT CIRCLE DIAMETER: 4.344 INCHES NOMINAL IN
•
CENTER HOLE DIAMETER: 0.203 INCHES NOMINAL IN
•
MATERIAL: RUBBER SYNTHETIC
TECHNICAL CHARACTERISTICS
OUTSIDE DIAMETER4.844 INCHES NOMINAL IN
STYLE DESIGNATORFLAT
MATERIAL THICKNESS0.025 INCHES NOMINAL IN
BOLT HOLE QUANTITY1
BOLT CIRCLE DIAMETER4.344 INCHES NOMINAL IN
SPECIAL FEATURESONE HOLE 0.203 IN. DIA LOCATED 1.062 IN. FROM CENTER LINE; ADDITIONAL MATERIAL: FIBER IN
CENTER HOLE DIAMETER0.203 INCHES NOMINAL IN
MATERIALRUBBER SYNTHETIC
HOLE DIAMETER0.203 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 1
1791-25Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 MR57?
MR57 is a DIAPHRAGM,VALVE,FLAT.
What parts can replace MR57?
There is 1 known substitute for MR57: 1791-25. Substitute compatibility should be verified for your specific system.
What is the NSN for MR57?
MR57 is cataloged in the U.S. Government catalog under NSN 4820-00-678-0261. 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.