PartsTable
Technical Data Sheet
Download PDF

AF531 — DIAPHRAGM,VALVE,FLAT

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

AF531: DIAPHRAGM,VALVE,FLAT.

The DIAPHRAGM,VALVE,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING, hole_diameter: 0.272 INCHES NOMINAL IN, overall_width: 2.812 INCHES NOMINAL IN, overall_length: 2.812 INCHES NOMINAL IN, special_features: SPECIAL SHAPE CENTER FLUID PASSAGE CUT-OUTS IN THE CENTER OF THE DIAPHRAGM, style_designator: FLAT. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-065-1779, 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
AF531
NSN: 4820-01-065-1779
FSC: 4820 — Valves, Nonpowered
CAGE: 24123 — GAST MFG CORP (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING
hole_diameter0.272 INCHES NOMINAL IN
overall_width2.812 INCHES NOMINAL IN
overall_length2.812 INCHES NOMINAL IN
special_featuresSPECIAL SHAPE CENTER FLUID PASSAGE CUT-OUTS IN THE CENTER OF THE DIAPHRAGM
style_designatorFLAT
bolt_hole_quantity4
material_thickness0.008 INCHES NOMINAL IN
center_to_center_distance_between_bolt_holes_along_width1.875 INCHES NOMINAL IN
center_to_center_distance_between_bolt_holes_along_length1.875 INCHES NOMINAL IN
NSN4820-01-065-1779
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: AF531 · 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
•
STYLE DESIGNATOR: FLAT
•
MATERIAL THICKNESS: 0.008 INCHES NOMINAL IN
•
BOLT HOLE QUANTITY: 4
•
CENTER TO CENTER DISTANCE BETWEEN BOLT HOLES ALONG LENGTH: 1.875 INCHES NOMINAL IN
•
CENTER TO CENTER DISTANCE BETWEEN BOLT HOLES ALONG WIDTH: 1.875 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
STYLE DESIGNATORFLAT
OVERALL LENGTH2.812 INCHES NOMINAL IN
OVERALL WIDTH2.812 INCHES NOMINAL IN
MATERIAL THICKNESS0.008 INCHES NOMINAL IN
BOLT HOLE QUANTITY4
CENTER TO CENTER DISTANCE BETWEEN BOLT HOLES ALONG LENGTH1.875 INCHES NOMINAL IN
SPECIAL FEATURESSPECIAL SHAPE CENTER FLUID PASSAGE CUT-OUTS IN THE CENTER OF THE DIAPHRAGM
CENTER TO CENTER DISTANCE BETWEEN BOLT HOLES ALONG WIDTH1.875 INCHES NOMINAL IN
MATERIALSTEEL CORROSION RESISTING
HOLE DIAMETER0.272 INCHES NOMINAL IN
OTHER ITEMS IN FSC 4820 — Valves, Nonpowered
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4820-00-000-0097 4820-00-001-0010 4820-00-001-0020 4820-00-001-0021 4820-00-001-0032 4820-00-001-0037 4820-00-001-0042 4820-00-001-1230
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
Ready to buy AF531?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is AF531?
AF531 is a DIAPHRAGM,VALVE,FLAT.
What is the NSN for AF531?
AF531 is cataloged in the U.S. Government catalog under NSN 4820-01-065-1779. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — AF531

✓ 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.