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Technical Data Sheet
PartsTable / COMPONENT / 975-7128
975-7128 ✓ 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

The TRANSFORMER,AUDIO FREQUENCY is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, overall_height: 0.250 INCHES NOMINAL IN, flange_diameter: 0.434 INCHES MINIMUM AND 0.436 INCHES MAXIMUM IN, hardness_rating: 58.0 ROCKWELL C MINIMUM AND 60.0 ROCKWELL C MAXIMUM OVERALL, style_designator: PLAIN, seat_angle_in_deg: 90.000 NOMINAL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-975-7128, 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
975-7128
NSN: 4820-00-975-7128
FSC: 4820
CAGE: 59155 — MARINE DIESEL, INC. DBA MARINE DIESEL (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
overall_height0.250 INCHES NOMINAL IN
flange_diameter0.434 INCHES MINIMUM AND 0.436 INCHES MAXIMUM IN
hardness_rating58.0 ROCKWELL C MINIMUM AND 60.0 ROCKWELL C MAXIMUM OVERALL
style_designatorPLAIN
seat_angle_in_deg90.000 NOMINAL
surface_treatmentPASSIVATE OVERALL
under_flange_height0.145 INCHES MINIMUM AND 0.155 INCHES MAXIMUM IN
body_outside_diameter0.248 INCHES MINIMUM AND 0.252 INCHES MAXIMUM IN
seating_surface_shapeANGULAR
body_stepped_inside_diameter0.250 INCHES NOMINAL SECOND STEP IN
flange_seat_to_disk_end_height0.095 INCHES MINIMUM AND 0.105 INCHES MAXIMUM IN
NSN4820-00-975-7128
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 975-7128 · 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
•
SEATING SURFACE SHAPE: ANGULAR
•
SEAT ANGLE IN DEG: 90.000 NOMINAL
•
FLANGE DIAMETER: 0.434 INCHES MINIMUM AND 0.436 INCHES MAXIMUM IN
•
BODY OUTSIDE DIAMETER: 0.248 INCHES MINIMUM AND 0.252 INCHES MAXIMUM IN
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
UNDER FLANGE HEIGHT: 0.145 INCHES MINIMUM AND 0.155 INCHES MAXIMUM IN
•
BODY STEPPED INSIDE DIAMETER: 0.124 INCHES MINIMUM AND 0.126 INCHES MAXIMUM FIRST STEP IN
•
HARDNESS RATING: 58.0 ROCKWELL C MINIMUM AND 60.0 ROCKWELL C MAXIMUM OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
SEATING SURFACE SHAPEANGULAR
SEAT ANGLE IN DEG90.000 NOMINAL
FLANGE DIAMETER0.434 INCHES MINIMUM AND 0.436 INCHES MAXIMUM IN
BODY OUTSIDE DIAMETER0.248 INCHES MINIMUM AND 0.252 INCHES MAXIMUM IN
SURFACE TREATMENTPASSIVATE OVERALL
UNDER FLANGE HEIGHT0.145 INCHES MINIMUM AND 0.155 INCHES MAXIMUM IN
BODY STEPPED INSIDE DIAMETER0.124 INCHES MINIMUM AND 0.126 INCHES MAXIMUM FIRST STEP IN
HARDNESS RATING58.0 ROCKWELL C MINIMUM AND 60.0 ROCKWELL C MAXIMUM OVERALL
BODY STEPPED INSIDE DIAMETER0.250 INCHES NOMINAL SECOND STEP IN
MATERIALSTEEL CORROSION RESISTING OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
42576Interchangeable
interchangeable cross-reference
interchangeable
48894Interchangeable
interchangeable cross-reference
interchangeable
57548M1Interchangeable
interchangeable cross-reference
interchangeable
AT-598Interchangeable
interchangeable cross-reference
interchangeable
3190084Interchangeable
interchangeable cross-reference
interchangeable
369760Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 975-7128?
975-7128 is a TRANSFORMER,AUDIO FREQUENCY.
What parts can replace 975-7128?
There are 7 known substitutes for 975-7128: 42576, 48894, 57548M1 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 975-7128?
975-7128 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-975-7128. 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