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Technical Data Sheet
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INS1258 — Technical Data Sheet

✓ Government record, cited
— · 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

The VALVE ASSEMBLY is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, bonnet_type: INSIDE SCREW, connection_type: THREADED INTERNAL PIPE ALL ENDS, connection_style: PLAIN,OPTIONAL END(PIPE) ALL ENDS, style_designator: STRAIGHT THRU, thread_direction: RIGHT-HAND ALL ENDS. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-873-7545, 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
INS1258
NSN: 4820-00-873-7545
NIINs: 008737545, 011717589
FSC: 4820 — Valves, Nonpowered
CAGE: 62073 — DYNATECH FRONTIER CORP SUB OF DYNATECH CORP (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
bonnet_typeINSIDE SCREW
connection_typeTHREADED INTERNAL PIPE ALL ENDS
connection_stylePLAIN,OPTIONAL END(PIPE) ALL ENDS
style_designatorSTRAIGHT THRU
thread_directionRIGHT-HAND ALL ENDS
features_providedBONNET PACKING
operating_pressure3500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
flow_control_deviceNEEDLE
nominal_thread_size0.125 INCHES ALL ENDS IN
valve_operation_methodMANUAL
bonnet_attachment_methodTHREADED
NSN4820-00-873-7545
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: INS1258 · 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
SUBSTITUTES & CROSS-REFERENCES 2
1N5125BPossible match (shared part number)
Possible match (shared part number)
Possible match (shared part number)
INS125BPossible match (shared part number)
Possible match (shared part number)
Possible match (shared part number)
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is INS1258?
INS1258 is a VALVE ASSEMBLY.
What parts can replace INS1258?
There are 2 known substitutes for INS1258: 1N5125B, INS125B. Substitute compatibility should be verified for your specific system.
Is INS1258 still available?
INS1258 is currently Unknown.
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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.