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Non-standard Flange
SDFL
The 304 hexagonal threaded non-standard flange is a custom-machined pipe connection with a hexagonal body and a female threaded bore. The hex body provides a wrenching surface during installation, while the threaded bore connects to threaded pipe or equipment without welding. Because this is a non-standard product, each unit is produced to the customer's drawing or sample rather than to a fixed standard series.
Hex wrenching body for easy on-site installation without special tools
Threaded connection, weld-free, fast assembly and disassembly for maintenance
Fully customized to drawing, compatible with all common thread standards
The hexagonal body is machined to the across-flats dimension specified by the purchaser. The internal thread can be produced to NPT, BSPP (G), BSPT, or metric thread standards, and is verified with the corresponding thread gauge before shipment.
The flange disk dimensions, including outer diameter, thickness, bolt-hole pattern, and sealing face, follow the customer drawing. Raised-face, flat-face, and weld-in configurations can be produced, and the disk can be shaped for tank or vessel welding where the design requires it.
The threaded connection removes the need for on-site welding at the connection point, which reduces installation time on equipment where welding access is limited. The hex body holds the part while the threaded pipe or fitting is tightened, and the same connection can be disassembled for maintenance or replacement.
Standard Material: ASTM A182 Grade F304 (UNS S30400, EN 1.4301) forged bar
Optional Material: ASTM A182 F304L, F316, F316L and other custom grades
An EN 10204 3.1 material test report is supplied with each batch. Thread inspection records, dimensional reports, and PMI results are available on request.
Production dimensions are taken from the customer drawing, as no fixed dimension series applies to this non-standard product. The general capability table and the ANSI B16.5 Class 300 flange dimension table shown on the page are reproduced below for reference.
Table 1. General Flange Capability Table (reproduced from the reference image)
Category | Details |
FLANGE TYPE | Standard: Hexagonal Threaded Flange; other flange types available upon request |
SIZE RANGE | Standard: DN15 – DN600;Custom sizes available per customer drawing |
PRESSURE RATING | Class 150 – 2500, PN0.6 – PN400, 5K – 40K |
SEALING FACE | RF, FF, RTJ, Tongue & Groove, customizable |
STANDARDS | ASME B16.5, EN 1092-1, DIN, JIS B2220, GOST 12821, GB/T 9124.1-2019, custom standards |
MATCHED PIPE SCHEDULE | SCH5S – SCH160 |
MATERIAL | Standard: ASTM A182 F304 / F304L Optional: F304/F304L, F316/F316L, F321, F347, duplex steel, nickel alloys, carbon steel |
SURFACE TREATMENT | Pickling & Passivation, As-machined, Mechanical Polishing, Electropolishing (EP) |
Applications | Petrochemical, pharmaceutical, power plants, shipbuilding, water treatment, general industrial piping |
Table 2. ANSI B16.5 Class 300 Flange Dimensions (reproduced from the reference image; all values in inches)
Nom. Pipe Size | O | T | R | X | No./Dia. of Holes | Bolt Circle Dia | L2 | H | B2 | L | B | r | L3 | B3 | D | C | Thr |
1/2 | 3.75 | 0.56 | 1.38 | 1.5 | 4-0.62 | 2.62 | 2.06 | 0.84 | 0.62 | 0.88 | 0.88 | 0.12 | 0.88 | 0.90 | 0.38 | 0.93 | 0.62 |
3/4 | 4.62 | 0.62 | 1.69 | 1.88 | 4-0.75 | 3.25 | 2.25 | 1.05 | 0.82 | 1.00 | 1.09 | 0.12 | 1.00 | 1.11 | 0.44 | 1.14 | 0.62 |
1 | 4.88 | 0.69 | 2.00 | 2.12 | 4-0.75 | 3.50 | 2.44 | 1.32 | 1.05 | 1.06 | 1.36 | 0.12 | 1.06 | 1.38 | 0.50 | 1.41 | 0.69 |
1-1/4 | 5.25 | 0.75 | 2.50 | 2.50 | 4-0.75 | 3.88 | 2.56 | 1.66 | 1.38 | 1.06 | 1.70 | 0.19 | 1.06 | 1.72 | 0.56 | 1.75 | 0.81 |
1-1/2 | 6.12 | 0.81 | 2.88 | 2.75 | 4-0.88 | 4.50 | 2.69 | 1.90 | 1.61 | 1.19 | 1.95 | 0.25 | 1.19 | 1.97 | 0.62 | 1.99 | 0.88 |
2 | 6.50 | 0.88 | 3.62 | 3.31 | 8-0.75 | 5.00 | 2.75 | 2.38 | 2.07 | 1.31 | 2.44 | 0.31 | 1.31 | 2.46 | 0.69 | 2.50 | 1.12 |
2-1/2 | 7.50 | 1.00 | 4.12 | 3.94 | 8-0.88 | 5.88 | 3.00 | 2.88 | 2.47 | 1.50 | 2.94 | 0.31 | 1.50 | 2.97 | 0.75 | 3.00 | 1.25 |
3 | 8.25 | 1.12 | 5.00 | 4.62 | 8-0.88 | 6.62 | 3.12 | 3.50 | 3.07 | 1.69 | 3.57 | 0.38 | 1.69 | 3.60 | 0.81 | 3.63 | 1.25 |
3-1/2 | 9.00 | 1.19 | 5.50 | 5.25 | 8-0.88 | 7.25 | 3.19 | 4.00 | 3.55 | 1.75 | 4.07 | 0.38 | 1.75 | 4.10 | / | 4.13 | 1.44 |
4 | 10.00 | 1.25 | 6.19 | 5.75 | 8-0.88 | 7.88 | 3.38 | 4.50 | 4.03 | 1.88 | 4.57 | 0.44 | 1.88 | 4.60 | / | 4.63 | 1.44 |
5 | 11.00 | 1.38 | 7.31 | 7.00 | 8-0.88 | 9.25 | 3.88 | 5.56 | 5.05 | 2.00 | 5.66 | 0.44 | 2.00 | 5.69 | / | 5.69 | 1.69 |
6 | 12.50 | 1.44 | 8.50 | 8.12 | 12-0.88 | 10.62 | 3.88 | 6.63 | 6.07 | 2.06 | 6.72 | 0.50 | 2.06 | 6.75 | / | 6.75 | 1.81 |
8 | 15.00 | 1.62 | 10.62 | 10.25 | 12-1.00 | 13.00 | 4.38 | 8.63 | 7.98 | 2.44 | 8.72 | 0.50 | 2.44 | 8.75 | / | 8.75 | 2.00 |
10 | 17.50 | 1.88 | 12.75 | 12.62 | 16-1.12 | 15.25 | 4.62 | 10.75 | 10.02 | 2.62 | 10.88 | 0.50 | 3.75 | 10.92 | / | 10.88 | 2.19 |
12 | 20.50 | 2.00 | 15.00 | 14.75 | 16-1.25 | 17.75 | 5.12 | 12.75 | 12.00 | 2.88 | 12.88 | 0.50 | 4.00 | 12.92 | / | 12.94 | 2.38 |
14 | 23.00 | 2.12 | 16.25 | 16.75 | 20-1.25 | 20.25 | 5.62 | 14.00 | 13.25 | 3.00 | 14.14 | 0.50 | 4.38 | 14.18 | / | 14.19 | 2.50 |
16 | 25.50 | 2.25 | 18.50 | 19.00 | 20-1.38 | 22.50 | 5.75 | 16.00 | 15.25 | 3.25 | 16.16 | 0.50 | 4.75 | 16.19 | / | 16.19 | 2.69 |
18 | 28.00 | 2.38 | 21.00 | 21.00 | 24-1.38 | 24.75 | 6.25 | 18.00 | 17.25 | 3.50 | 18.18 | 0.50 | 5.12 | 18.20 | / | 18.19 | 2.75 |
20 | 30.50 | 2.50 | 23.00 | 23.12 | 24-1.38 | 27.00 | 6.38 | 20.00 | 19.25 | 3.75 | 20.20 | 0.50 | 5.50 | 20.25 | / | 20.19 | 2.88 |
22 | 33.00 | 2.63 | 25.25 | 25.25 | 24-1.63 | 29.25 | 6.50 | 22.00 | 21.25 | 4.00 | 22.22 | 0.50 | 5.75 | 22.25 | / | 22.19 | 3.13 |
24 | 36.00 | 2.75 | 27.25 | 27.62 | 24-1.62 | 32.00 | 6.62 | 24.00 | 23.25 | 4.19 | 24.25 | 0.50 | 6.00 | 24.25 | / | 24.19 | 3.25 |
Parts are forged or cut from bar, then CNC-machined, threaded, and finished by pickling and passivation or supplied with an as-machined surface. Thread gauging, dimensional inspection, and visual surface checks are performed before packing and shipment. Each part can be marked with the material grade, heat number, and thread size for traceability, and export packaging is arranged for FCL and LCL shipments.
1. Raw Material PMI Spectral Inspection
2. Closed-die Hot Forging (Hydraulic Forming Press)
3. Solution Heat Treatment (Continuous Heat Treatment Line)
4. Precision CNC Machining (5-axis Machining Center, High-precision CNC Lathe)
5. Semi-finishing Dimensional & Surface Inspection
6. Surface Finishing (Pickling & Passivation / Mechanical / Electropolishing)
7. Final Quality Control (Dimensional Test, NDT, Surface Defect Check)
8. Export Standard Packaging
9. Delivery
Typical uses include tank and vessel outlets, pump and valve connections, hydraulic and lubrication units, instrumentation and small-bore piping, water-treatment equipment, and machinery connections where a weld-free threaded joint with a wrenching surface is required.
To provide a quotation, supply the drawing or sample, thread standard and size, across-flats dimension, disk diameter and thickness, material grade, quantity, and finish requirements. Prototype and small-batch orders are supported, and first-article inspection can be arranged before batch production.
 D2000 Certificate |  PED Certificate |  PED Certificate |
 TS Pressure Pipe Element Manufacturing License |  EAC Certificate |  EAC Certificate |
 ISO 9001 Quality Management System |  ISO 14001 Environmental Management System |  ISO 45001 Occupational Health & Safety System |
Material Verification: 100% PMI spectral analysis, chemical composition fully traceable to original mill melt number
Dimensional Control: High-precision dimension inspection, strict tolerance compliance with international standards
Non-destructive Testing: Penetrant test, ultrasonic test, radiographic test available on request
Surface & Cleanliness: Surface defect inspection; sanitary grade electrolytic polishing & cleanliness test
Third-party Inspection: SGS, BV, TUV witnessed inspection supported
16+ Years Professional Manufacturer (Founded in 2010, based in Wenzhou, China)
Full In-house Production Chain: Forging → Heat Treatment → CNC Machining → Testing
Leading Special Alloy Technology: Mature processing of nickel-based, Hastelloy, super austenitic and super duplex steel
Dual Product System: Industrial heavy-duty flanges + Sanitary high-purity flanges
Complete Authoritative Certifications: TS pressure pipe license, ISO 9001/14001/45001, CE-PED, AD2000, EAC
Full Engineering Support: Working condition analysis, material selection, custom solution design
New Energy Layout: Professional piping solutions for data center liquid cooling, hydrogen energy and energy storage
Stable & Reliable Delivery: exported to 30+ countries
A drawing or sample is required, together with the thread standard and size, across-flats dimension, disk dimensions, material grade, quantity, and finish.
NPT, BSPP (G), BSPT, and metric threads can be produced according to the drawing.
Yes. The material can be changed to 304L, 316, 316L, or other specified grades.
Custom parts typically take 8-15 working days after drawing confirmation. The schedule depends on complexity, quantity, and inspection requirements.
Prototype quantities from one piece are supported for non-standard items.
Samples and first-article inspection reports can be arranged for approval before volume production begins.
Parts can be supplied pickled and passivated, with an as-machined finish, or with a polished finish according to the drawing.
If a part does not match the drawing or the agreed inspection report, replacement or return is arranged under the terms of the sales contract.
The hex body provides a flat wrenching surface for easy tightening and removal without special flange tools; it also offers better torque resistance than round bodies, ideal for tight installation spaces.
Yes, we can produce NPT, BSPT, BSPP threads matching SCH40, SCH80 and other standard pipe schedules, fully manufactured to your drawing specifications.
