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Technical Data Sheet
PartsTable / COMPONENT / 620-608
620-608 ✓ Verified by PartsTable
Kosmos · 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

CAP ASSEMBLY,PROTECTIVE,MUFFLER-. Key specifications include end_item_identification: 1980 GMC ASTRO TRACTOR, pipe_outside_diameter_accommodated: 4.000 INCHES IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-063-8911, 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
620-608
NSN: 4820-00-063-8911
FSC: 4820
CAGE: 9E328 — STEWARD MACHINE CO INC (USA)
SPECIFICATIONS
end_item_identification1980 GMC ASTRO TRACTOR
pipe_outside_diameter_accommodated4.000 INCHES IN
NSN4820-00-063-8911
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 620-608 · Kosmos ⚠ 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
•
UNDER FLANGE HEIGHT: 0.188 INCHES NOMINAL IN
•
SEAT ANGLE IN DEG: 30.000 NOMINAL
•
MATERIAL: COBALT ALLOY FACE
•
SEATING SURFACE SHAPE: ANGULAR
•
BODY INSIDE DIAMETER: 1.290 INCHES MINIMUM AND 1.292 INCHES MAXIMUM IN
•
HARDNESS RATING: 202.0 BRINELL STANDARD NOMINAL BODY
•
STYLE DESIGNATOR: PLAIN FLANGED
TECHNICAL CHARACTERISTICS (FLIS)
UNDER FLANGE HEIGHT0.188 INCHES NOMINAL IN
SEAT ANGLE IN DEG30.000 NOMINAL
MATERIALCOBALT ALLOY FACE
SEATING SURFACE SHAPEANGULAR
BODY INSIDE DIAMETER1.290 INCHES MINIMUM AND 1.292 INCHES MAXIMUM IN
HARDNESS RATING202.0 BRINELL STANDARD NOMINAL BODY
MATERIALSTEEL COMP 410 BODY
STYLE DESIGNATORPLAIN FLANGED
HARDNESS RATING202.0 BRINELL STANDARD NOMINAL FACE
BODY OUTSIDE DIAMETER2.315 INCHES MINIMUM AND 2.320 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
62060-8Interchangeable
interchangeable cross-reference
interchangeable
62060Interchangeable
interchangeable cross-reference
interchangeable
60-620PC608Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 620-608?
620-608 is a CAP ASSEMBLY,PROTECTIVE,MUFFLER- manufactured by Kosmos.
What parts can replace 620-608?
There are 3 known substitutes for 620-608: 62060-8, 62060, 60-620PC608. Substitute compatibility should be verified for your specific system.
What is the NSN for 620-608?
620-608 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-063-8911. 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