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855017P0257 — VALVE,LINEAR,DIRECTIONAL CONTROL

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

855017P0257: VALVE,LINEAR,DIRECTIONAL CONTROL.

VALVE,LINEAR,DIRECTIONAL CONTROL. Key specifications include connection_type: THREADED INTERNAL TUBE, nominal_thread_size: 1.312 INCHES AND 1.062 INCHES IN, thread_quantity_per_inch: 12, thread_series_designator: UN, valve_discharge_flow_rate: 35.0 GALLONS PER MINUTE, furnished_items_and_quantity: 1 RELIEF VALVE. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-360-4979, 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
855017P0257
NSN: 4820-01-360-4979
FSC: 4820 — Valves, Nonpowered
CAGE: 0CA08 — ATLAS COPCO (USA)
SPECIFICATIONS
connection_typeTHREADED INTERNAL TUBE
nominal_thread_size1.312 INCHES AND 1.062 INCHES IN
thread_quantity_per_inch12
thread_series_designatorUN
valve_discharge_flow_rate35.0 GALLONS PER MINUTE
furnished_items_and_quantity1 RELIEF VALVE
NSN4820-01-360-4979
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 855017P0257 · 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
•
FURNISHED ITEMS AND QUANTITY: 1 RELIEF VALVE
•
CONNECTION TYPE: THREADED INTERNAL TUBE
•
NOMINAL THREAD SIZE: 1.312 INCHES AND 1.062 INCHES IN
•
THREAD QUANTITY PER INCH: 12
•
THREAD SERIES DESIGNATOR: UN
•
VALVE DISCHARGE FLOW RATE: 35.0 GALLONS PER MINUTE
TECHNICAL CHARACTERISTICS
FURNISHED ITEMS AND QUANTITY1 RELIEF VALVE
CONNECTION TYPETHREADED INTERNAL TUBE
NOMINAL THREAD SIZE1.312 INCHES AND 1.062 INCHES IN
THREAD QUANTITY PER INCH12
THREAD SERIES DESIGNATORUN
VALVE DISCHARGE FLOW RATE35.0 GALLONS PER MINUTE
OTHER ITEMS IN FSC 4820 — Valves, Nonpowered
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4820-00-000-0097 4820-00-001-0010 4820-00-001-0020 4820-00-001-0021 4820-00-001-0032 4820-00-001-0037 4820-00-001-0042 4820-00-001-1230
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

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 855017P0257?
855017P0257 is a VALVE,LINEAR,DIRECTIONAL CONTROL.
What is the NSN for 855017P0257?
855017P0257 is cataloged in the U.S. Government catalog under NSN 4820-01-360-4979. 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.