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Technical Data Sheet
PartsTable / COMPONENT / 20521-100
20521-100 ✓ 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

CAPACITOR,FIXED,CERAMIC DIELECTR. Key specifications include material: STEEL BODY, bonnet_type: INSIDE SCREW, thread_class: 2A ALL ENDS A, connection_type: THREADED EXTERNAL TUBE ALL ENDS, connection_style: PLAIN (TUBE) ALL ENDS, style_designator: STRAIGHT THRU. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-590-9162, 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
20521-100
NSN: 4820-00-590-9162
FSC: 4820
CAGE: 26505 — GROVE VALVE OPERATIONS (USA)
SPECIFICATIONS
materialSTEEL BODY
bonnet_typeINSIDE SCREW
thread_class2A ALL ENDS A
connection_typeTHREADED EXTERNAL TUBE ALL ENDS
connection_stylePLAIN (TUBE) ALL ENDS
style_designatorSTRAIGHT THRU
thread_directionRIGHT-HAND ALL ENDS
flow_control_deviceDISK
nominal_thread_size0.250 INCHES ALL ENDS IN
valve_operation_methodMANUAL
bonnet_attachment_methodBOLTED
thread_series_designatorUNF ALL ENDS
NSN4820-00-590-9162
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 20521-100 · 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
•
NOMINAL THREAD SIZE: 0.250 INCHES ALL ENDS IN
•
STYLE DESIGNATOR: STRAIGHT THRU
•
BONNET TYPE: INSIDE SCREW
•
THREAD SERIES DESIGNATOR: UNF ALL ENDS
•
FLOW CONTROL DEVICE: DISK
•
CONNECTION STYLE: PLAIN (TUBE) ALL ENDS
•
VALVE OPERATION METHOD: MANUAL
•
THREAD CLASS: 2A ALL ENDS A
TYPICAL APPLICATIONS
  • RAID cache protection during power loss events
  • Write-back cache enablement for storage controllers
  • Enterprise server data integrity assurance
  • Hot-swap battery/capacitor replacement in production
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL THREAD SIZE0.250 INCHES ALL ENDS IN
STYLE DESIGNATORSTRAIGHT THRU
BONNET TYPEINSIDE SCREW
THREAD SERIES DESIGNATORUNF ALL ENDS
FLOW CONTROL DEVICEDISK
CONNECTION STYLEPLAIN (TUBE) ALL ENDS
VALVE OPERATION METHODMANUAL
THREAD CLASS2A ALL ENDS A
BONNET ATTACHMENT METHODBOLTED
CONNECTION TYPETHREADED EXTERNAL TUBE ALL ENDS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
30501Interchangeable
interchangeable cross-reference
interchangeable
1C1694-11Interchangeable
interchangeable cross-reference
interchangeable
10043943Interchangeable
interchangeable cross-reference
interchangeable
205-211Interchangeable
interchangeable cross-reference
interchangeable
5205211000Interchangeable
interchangeable cross-reference
interchangeable
CQ108Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 20521-100?
20521-100 is a CAPACITOR,FIXED,CERAMIC DIELECTR.
What parts can replace 20521-100?
There are 13 known substitutes for 20521-100: 30501, 1C1694-11, 10043943 and 10 more. Substitute compatibility should be verified for your specific system.
Is 20521-100 still available?
20521-100 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026