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SK1156 ✓ Verified by PartsTable
— · GATE VALVE
WHAT YOU NEED TO KNOW
Full open or full close only — never throttle Rising stem shows position visually
Throttling a gate valve erodes seats
PRODUCT OVERVIEW

CYLINDER ASSEMBLY,AIR AND HYDRAU. Key specifications include material: PLASTIC POLYETHYLENE TEREPHTHALATE (PET)(POLYESTER) FLOW CONTROL DEVICE, bonnet_type: INSIDE SCREW, surface_treatment: ANODIZE LOCATION NOT OTHERWISE SPECIFIED, disk_loading_method: SPRING, flow_control_device: BALL, valve_operation_method: AUTOMATIC. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-446-8381, 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
SK1156
NSN: 4820-00-446-8381
FSC: 4820
CAGE: 22501 — HOWELL LABORATORIES INC DBA HOWELL LABORATORIES INC (USA)
SPECIFICATIONS
materialPLASTIC POLYETHYLENE TEREPHTHALATE (PET)(POLYESTER) FLOW CONTROL DEVICE
bonnet_typeINSIDE SCREW
surface_treatmentANODIZE LOCATION NOT OTHERWISE SPECIFIED
disk_loading_methodSPRING
flow_control_deviceBALL
valve_operation_methodAUTOMATIC
bonnet_attachment_methodINTEGRAL
surface_treatment_document_and_classificationMIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE LOCATION NOT OTHERWISE SPECIFIED
NSN4820-00-446-8381
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: SK1156 · 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
•
DISK LOADING METHOD: SPRING
•
BONNET TYPE: INSIDE SCREW
•
SURFACE TREATMENT: ANODIZE LOCATION NOT OTHERWISE SPECIFIED
•
MATERIAL: PLASTIC POLYETHYLENE TEREPHTHALATE (PET)(POLYESTER) FLOW CONTROL DEVICE
•
FLOW CONTROL DEVICE: BALL
•
BONNET ATTACHMENT METHOD: INTEGRAL
•
VALVE OPERATION METHOD: AUTOMATIC
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE LOCATION NOT OTHERWISE SPECIFIED
TECHNICAL CHARACTERISTICS (FLIS)
DISK LOADING METHODSPRING
BONNET TYPEINSIDE SCREW
SURFACE TREATMENTANODIZE LOCATION NOT OTHERWISE SPECIFIED
MATERIALPLASTIC POLYETHYLENE TEREPHTHALATE (PET)(POLYESTER) FLOW CONTROL DEVICE
FLOW CONTROL DEVICEBALL
BONNET ATTACHMENT METHODINTEGRAL
VALVE OPERATION METHODAUTOMATIC
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE LOCATION NOT OTHERWISE SPECIFIED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
221-8-2Interchangeable
interchangeable cross-reference
interchangeable
9219365Interchangeable
interchangeable cross-reference
interchangeable
561309Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is SK1156?
SK1156 is a CYLINDER ASSEMBLY,AIR AND HYDRAU.
What parts can replace SK1156?
There are 3 known substitutes for SK1156: 221-8-2, 9219365, 561309. Substitute compatibility should be verified for your specific system.
What is the NSN for SK1156?
SK1156 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-446-8381. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026