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Technical Data Sheet
PartsTable / COMPONENT / 300-6IN
300-6IN ✓ Verified by PartsTable
— · HOSE FITTING
WHAT YOU NEED TO KNOW
PTFE tape on tapered threads (NPT/BSPT) JIC/AN flare connections seal metal-to-metal — no tape
NPT != BSPT — look identical, NOT interchangeable
PRODUCT OVERVIEW

The FLANGE,PIPE is a the manufacturer industrial component. Key specifications include material: STEEL, thickness: 1.375 INCHES NOMINAL IN, neck_height: 2.438 INCHES NOMINAL IN, flange_diameter: 12.500 INCHES NOMINAL IN, style_designator: ROUND, ONE BOLT HOLE CIRCLE, bolt_hole_diameter: 0.875 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-256-8511, 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
300-6IN
NSN: 4730-00-256-8511
FSC: 4730
CAGE: 63686 — THE WALWORTH COMPANY (USA)
SPECIFICATIONS
materialSTEEL
thickness1.375 INCHES NOMINAL IN
neck_height2.438 INCHES NOMINAL IN
flange_diameter12.500 INCHES NOMINAL IN
style_designatorROUND, ONE BOLT HOLE CIRCLE
bolt_hole_diameter0.875 INCHES NOMINAL IN
bolt_hole_quantity12
raised_face_height0.062 INCHES NOMINAL IN
bolt_circle_diameter10.625 INCHES NOMINAL IN
flange_section_styleRAISED FACE, WELDING NECK
raised_face_diameter8.500 INCHES NOMINAL IN
specification/standard_data80204-ASA B16.5,TABLES 16 AND 17 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
NSN4730-00-256-8511
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 300-6IN · OEM ⚠ VERIFY BEFORE ORDERING NPT ≠ BSPT — tapered threads look identical but are NOT interchangeable. Wrong thread = leak. JIC (37°) ≠ AN (37°) ≠ SAE 45° — flare angles must match exactly. Measure thread pitch with gauge — visual identification is unreliable ✓ BROKER TIP Always use thread sealant (PTFE tape or pipe compound) on tapered threads (NPT/BSPT). JIC/AN flare fittings seal metal-to-metal — never use tape on flare connections PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A105,GRADES 1 AND 2 AND A181,GRADES 1 AND 2 ASSN STD SINGLE MATERIAL RESPONSE
•
OPERATING PRESSURE AND TYPE: 300.0 POUNDS PER SQUARE INCH (PSI) GAS MAXIMUM REQUIRED AND 300.0 POUNDS PER SQUARE INCH (PSI) OIL MAXIMUM REQUIRED AND 300.0 POUNDS PER SQUARE INCH (PSI) WATER MAXIMUM REQUIRED LOCATION NOT OTHERWISE SPECIFIED LBS
•
STYLE DESIGNATOR: ROUND, ONE BOLT HOLE CIRCLE
•
SPECIFICATION/STANDARD DATA: 80204-ASA B16.5,TABLES 16 AND 17 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
•
BOLT HOLE QUANTITY: 12
•
FACE SEATING SURFACE CONDITION: MACHINED
•
RAISED FACE HEIGHT: 0.062 INCHES NOMINAL IN
•
THICKNESS: 1.375 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A105,GRADES 1 AND 2 AND A181,GRADES 1 AND 2 ASSN STD SINGLE MATERIAL RESPONSE
OPERATING PRESSURE AND TYPE300.0 POUNDS PER SQUARE INCH (PSI) GAS MAXIMUM REQUIRED AND 300.0 POUNDS PER SQUARE INCH (PSI) OIL MAXIMUM REQUIRED AND 300.0 POUNDS PER SQUARE INCH (PSI) WATER MAXIMUM REQUIRED LOCATION NOT OTHERWISE SPECIFIED LBS
STYLE DESIGNATORROUND, ONE BOLT HOLE CIRCLE
SPECIFICATION/STANDARD DATA80204-ASA B16.5,TABLES 16 AND 17 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
BOLT HOLE QUANTITY12
FACE SEATING SURFACE CONDITIONMACHINED
RAISED FACE HEIGHT0.062 INCHES NOMINAL IN
THICKNESS1.375 INCHES NOMINAL IN
BOLT CIRCLE DIAMETER10.625 INCHES NOMINAL IN
FLANGE DIAMETER12.500 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
B16-5-1961Interchangeable
interchangeable cross-reference
interchangeable
B16-5-2017Interchangeable
interchangeable cross-reference
interchangeable
31Interchangeable
interchangeable cross-reference
interchangeable
MIL-F-18180CInterchangeable
interchangeable cross-reference
interchangeable
M18180/1-027A01AInterchangeable
interchangeable cross-reference
interchangeable
B16-15Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 300-6IN?
300-6IN is a FLANGE,PIPE.
What parts can replace 300-6IN?
There are 12 known substitutes for 300-6IN: B16-5-1961, B16-5-2017, 31 and 9 more. Substitute compatibility should be verified for your specific system.
Is 300-6IN still available?
300-6IN is currently cancelled.
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PartsTable Design LLC · partstable.com
Last verified: July 2026