BS 10 Table D Flanges
Designed for low-pressure cooling water, municipal utilities, and light-duty steam systems. Rated for 100 psi (approx. 7 bar) at temperatures from -18°C to 230°C, with hydraulic test pressure at 150 psi.
BS 10Certified 1962 Spec
British Standard Specification 
Engineering Standard for BS 10 Pipe Flanges & Bolting
British Standard 10 (BS 10:1962) defines dimensions, bolt circles, nominal thickness, and pressure-temperature boundaries for flanges used in industrial piping, valves, pumps, and containment systems. Classified by lettered tables (Table D, Table E, Table F, Table H, Table J, Table K, Table R, Table S, Table T), the standard establishes reliable duty ratings from low-pressure utility lines up to 2800 psi severe hydraulic service.
Fully Certified for Export
All BS 10 flanges are supplied with EN 10204 3.1 inspection certification, full chemical and mechanical mill analysis, ultrasonic testing, and heat-number traceability stamped directly on the flange rim.
- Full Table Coverage: Table D, Table E, Table F, Table H, Table J, and Table K
- Configurations: Slip-On (SORF/SOFF), Weld Neck, Blind (BLRF/BLFF), Screwed/Threaded, and Plate
- Forged in Carbon Steel (ASTM A105), Stainless Steel (304L/316L), Duplex 2205, Super Duplex 2507, Cu-Ni 90/10 & 70/30, and Nickel Alloys
- Precision CNC machining complying with ASME B16.5 and BS 10 allowable tolerances
ISO 9001:2015 IBR Approved EIL Approved EN 10204 3.1 MTC
Technical Reference
BS 10 Flange Table Comparison: D, E, F, H, J, and K
Understanding the dimensional differences, bolt counts, and working pressures among the primary BS 10 tables allows project engineers and procurement managers to ensure joint integrity across utility and process piping.
BS 10 Table E Flanges
The most widely installed British Standard flange for process plants and commercial piping. Rated up to 200 psi (14 bar) at working temperatures up to 230°C, offering thicker profiles than Table D.
BS 10 Table F Flanges
Heavy-duty flanges for medium-pressure steam, oil pipelines, and boiler lines. Rated for 300 psi (21 bar) working pressure up to 230°C, and hydraulic test pressure proofed to 450 psi.
BS 10 Table H & J Flanges
Engineered for high-pressure industrial service and power generation. Table H delivers 500 psi (35 bar) rating with 750 psi test, while Table J operates at 700 psi (48 bar) with a 1050 psi proof load.
Manufacturing Scope
Standard Manufacturing Specification of BS 10 Flanges
Complete metallurgical and dimensional compliance for procurement engineers, EPC contractors, and global distribution partners.
| Parameter | Manufacturing Specification & Global Compliance Scope |
|---|---|
| Standard Specification | British Standard BS 10:1962 (Flanges and Bolting for Pipes, Valves, and Fittings) |
| Available Tables | Table A, Table D, Table E, Table F, Table H, Table J, Table K, Table R, Table S, Table T |
| Size Range | 1/2 inch (DN15) through 24 inch (DN600); larger diameters up to 48 inch manufactured to drawing |
| Flange Facings | Flat Face (FF), Raised Face (RF: 1/16″ or 1/4″), Ring Type Joint (RTJ), Tongue & Groove (T/G) |
| Facing Surface Finish | Stock Finish (Ra 3.2 to 6.3 μm / 125 to 250 μin), Smooth Finish (Ra 1.6 to 3.2 μm), Concentric / Spiral Serrated |
| Flange Types | Slip-On (SORF / SOFF), Weld Neck (WNRF), Blind (BLRF / BLFF), Screwed/Threaded (NPT/BSPT), Lap Joint, Plate Flanges |
| Carbon Steel Grades | ASTM A105, A105N, ASTM A350 LF2 (Low Temp), BS 1503-161, BS 1501-151, P235GH, P250GH |
| Stainless Steel Grades | ASTM A182 F304, F304L, F316, F316L, F321, F347, F310S, 904L, 1.4301, 1.4404 |
| Duplex & Alloy Grades | ASTM A182 F51 (UNS S31803 / 2205), F53 (UNS S32750 / 2507), F11, F22, F91, Monel 400, Inconel 625, Hastelloy C276 |
| Marking Format | Manufacturer's Brand, BS 10 Table designation, Nominal Size, Material Grade, Heat Number stamped on rim |
| Quality Certification | EN 10204 3.1 Mill Test Certificate, NDT (UT/MT/PT), PMI Spectroscopy, Hydrostatic Test Reports |
Dimensional Data
BS 10 Table D Flange Dimensions Chart (mm)
Nominal sizes from 1/2 inch to 24 inch. All dimensions comply with standard BS 10 Table D tolerance protocols.
| Nominal Bore (NPS) | DN (mm) | Flange OD (D) | PCD (K) | Hole Dia (L) | Flange Thk (C) | Raised Face (B) | Neck Dia (A) | No. of Bolts | Bolt Size (in) |
|---|---|---|---|---|---|---|---|---|---|
| 1/2″ | 15 | 95.3 | 66.8 | 14.5 | 4.8 | 22.4 | 21.3 | 4 | 1/2″ |
| 3/4″ | 20 | 101.6 | 73.2 | 14.5 | 4.8 | 27.7 | 26.7 | 4 | 1/2″ |
| 1″ | 25 | 114.3 | 82.6 | 14.5 | 4.8 | 34.6 | 33.5 | 4 | 1/2″ |
| 1-1/4″ | 32 | 120.7 | 87.4 | 14.5 | 6.4 | 43.2 | 42.2 | 4 | 1/2″ |
| 1-1/2″ | 40 | 133.4 | 98.6 | 14.5 | 6.4 | 49.5 | 48.3 | 4 | 1/2″ |
| 2″ | 50 | 152.4 | 114.3 | 17.5 | 7.9 | 62.0 | 60.5 | 4 | 5/8″ |
| 2-1/2″ | 65 | 165.1 | 127.0 | 17.5 | 7.9 | 74.7 | 73.2 | 4 | 5/8″ |
| 3″ | 80 | 184.2 | 146.1 | 17.5 | 9.7 | 90.7 | 88.9 | 4 | 5/8″ |
| 4″ | 100 | 215.9 | 177.8 | 17.5 | 9.7 | 116.1 | 114.3 | 4 | 5/8″ |
| 5″ | 125 | 254.0 | 209.6 | 17.5 | 12.7 | 143.8 | 141.2 | 8 | 5/8″ |
| 6″ | 150 | 279.4 | 235.0 | 17.5 | 12.7 | 171.7 | 168.4 | 8 | 5/8″ |
| 8″ | 200 | 336.6 | 292.1 | 17.5 | 12.7 | 221.5 | 219.2 | 8 | 5/8″ |
| 10″ | 250 | 406.4 | 355.6 | 22.2 | 16.0 | 276.4 | 273.1 | 8 | 3/4″ |
| 12″ | 300 | 457.2 | 406.4 | 22.2 | 19.1 | 325.9 | 323.9 | 12 | 3/4″ |
| 14″ | 350 | 527.1 | 469.9 | 25.4 | 22.2 | 359.2 | 355.6 | 12 | 7/8″ |
| 16″ | 400 | 577.9 | 520.7 | 25.4 | 22.2 | 410.5 | 406.4 | 12 | 7/8″ |
| 18″ | 450 | 641.4 | 584.2 | 25.4 | 25.4 | 461.8 | 457.2 | 12 | 7/8″ |
| 20″ | 500 | 704.9 | 641.4 | 25.4 | 28.6 | 513.1 | 508.0 | 16 | 7/8″ |
| 24″ | 600 | 825.5 | 755.7 | 28.7 | 31.8 | 616.0 | 609.6 | 16 | 1″ |
Standard Industrial Specification
BS 10 Table E Flange Dimensions Chart (mm)
The global benchmark for British Standard piping connections rated up to 200 psi working pressure.
| Nominal Bore (NPS) | DN (mm) | Flange OD (D) | PCD (K) | Hole Dia (L) | Flange Thk (C) | Raised Face (B) | Neck Dia (A) | No. of Bolts | Bolt Size (in) |
|---|---|---|---|---|---|---|---|---|---|
| 1/2″ | 15 | 95.3 | 66.8 | 14.5 | 6.4 | 22.4 | 21.3 | 4 | 1/2″ |
| 3/4″ | 20 | 101.6 | 73.2 | 14.5 | 6.4 | 27.7 | 26.7 | 4 | 1/2″ |
| 1″ | 25 | 114.3 | 82.6 | 14.5 | 7.2 | 34.6 | 33.5 | 4 | 1/2″ |
| 1-1/4″ | 32 | 120.7 | 87.4 | 14.5 | 7.9 | 43.2 | 42.2 | 4 | 1/2″ |
| 1-1/2″ | 40 | 133.4 | 98.6 | 14.5 | 8.7 | 49.5 | 48.3 | 4 | 1/2″ |
| 2″ | 50 | 152.4 | 114.3 | 17.5 | 9.5 | 62.0 | 60.5 | 4 | 5/8″ |
| 2-1/2″ | 65 | 165.1 | 127.0 | 17.5 | 10.3 | 74.7 | 73.2 | 4 | 5/8″ |
| 3″ | 80 | 184.2 | 146.1 | 17.5 | 11.1 | 90.7 | 88.9 | 4 | 5/8″ |
| 4″ | 100 | 215.9 | 177.8 | 17.5 | 12.7 | 116.1 | 114.3 | 8 | 5/8″ |
| 5″ | 125 | 254.0 | 209.6 | 17.5 | 14.3 | 143.8 | 141.2 | 8 | 5/8″ |
| 6″ | 150 | 279.4 | 235.0 | 17.5 | 17.5 | 171.7 | 168.4 | 8 | 5/8″ |
| 8″ | 200 | 336.6 | 292.1 | 17.5 | 19.1 | 221.5 | 219.2 | 8 | 5/8″ |
| 10″ | 250 | 406.4 | 355.6 | 22.2 | 22.2 | 276.4 | 273.1 | 8 | 3/4″ |
| 12″ | 300 | 457.2 | 406.4 | 22.2 | 25.4 | 325.9 | 323.9 | 12 | 3/4″ |
| 14″ | 350 | 527.1 | 469.9 | 25.4 | 28.6 | 359.2 | 355.6 | 12 | 7/8″ |
| 16″ | 400 | 577.9 | 520.7 | 25.4 | 31.8 | 410.5 | 406.4 | 12 | 7/8″ |
| 18″ | 450 | 641.4 | 584.2 | 25.4 | 34.9 | 461.8 | 457.2 | 12 | 7/8″ |
| 20″ | 500 | 704.9 | 641.4 | 25.4 | 38.1 | 513.1 | 508.0 | 16 | 7/8″ |
| 24″ | 600 | 825.5 | 755.7 | 28.7 | 47.6 | 616.0 | 609.6 | 16 | 1″ |
Engineering Duty Matrix
BS 10 Pressure-Temperature Ratings (psi / bar)
Maximum allowable working pressure versus operational fluid temperature for carbon steel and stainless steel BS 10 flanges.
| BS 10 Table | -18°C to 230°C (0°F to 450°F) | 260°C (500°F) | 315°C (600°F) | 370°C (700°F) | 425°C (800°F) | 450°C (850°F) | Max Hydraulic Test (psi) |
|---|---|---|---|---|---|---|---|
| Table D | 100 psi (6.9 bar) | 95 psi | 80 psi | 65 psi | 50 psi | – | 150 psi (10.3 bar) |
| Table E | 200 psi (13.8 bar) | 185 psi | 155 psi | 130 psi | 100 psi | – | 300 psi (20.7 bar) |
| Table F | 300 psi (20.7 bar) | 280 psi | 235 psi | 195 psi | 150 psi | – | 450 psi (31.0 bar) |
| Table H | 500 psi (34.5 bar) | 465 psi | 395 psi | 320 psi | 250 psi | 180 psi | 750 psi (51.7 bar) |
| Table J | 700 psi (48.3 bar) | 650 psi | 550 psi | 450 psi | 350 psi | 255 psi | 1,050 psi (72.4 bar) |
| Table K | 900 psi (62.1 bar) | 835 psi | 705 psi | 580 psi | 450 psi | 325 psi | 1,350 psi (93.1 bar) |
| Table R | 1,200 psi (82.7 bar) | 1,115 psi | 945 psi | 770 psi | 600 psi | 435 psi | 1,800 psi (124 bar) |
| Table S | 1,800 psi (124 bar) | 1,670 psi | 1,415 psi | 1,155 psi | 900 psi | 655 psi | 2,700 psi (186 bar) |
| Table T | 2,800 psi (193 bar) | 2,600 psi | 2,200 psi | 1,800 psi | 1,400 psi | 1,025 psi | 4,200 psi (290 bar) |
Quality Assurance & Tolerances
Precision Tolerances & Material Inspection Protocols
Every BS 10 flange machined at our Mumbai forging facility conforms to rigorous dimensional tolerances and non-destructive examination standards.
Dimensional Tolerances (BS 10 & ASME B16.5)
Outside Diameter (OD): ±1.6 mm up to 24″, ±3.2 mm for >24″.
Flange Thickness (C): +3.2 mm / -0.0 mm up to 18″, +4.8 mm / -0.0 mm for >18″.
Bolt Circle Diameter (PCD): ±1.6 mm. Bolt Hole Spacing: ±0.8 mm.
Bore Diameter (Slip-On): +0.8 mm / -0.0 mm.
Inspection & Non-Destructive Testing
100% Dimensional verification and visual surface check.
Positive Material Identification (PMI) with portable XRF analyzer.
Ultrasonic Examination (UT) for internal defect detection on forgings.
Hydrostatic pressure testing witnessed by TPI agencies upon request.
Procurement FAQ
Frequently Asked Questions on BS 10 Flanges
What is the BS 10 flange specification?
BS 10:1962 is the British Standard specification for flanges and bolting for pipes, valves, and fittings. It uses lettered tables (Table D, E, F, H, J, K, etc.) to establish flange outer diameters, thickness, bolt patterns, and pressure ratings for steam, water, and industrial processing systems.
Can BS 10 Table D and Table E flanges mate together?
In pipe sizes from 1/2 inch to 4 inches, BS 10 Table D and Table E have identical bolt circles (PCD) and bolt counts (4 holes), allowing them to physically bolt together. However, starting at 4 inches and above, bolt quantities differ (e.g., 4-inch Table D has 4 bolts, while Table E has 8 bolts), so they cannot be mated directly without transition adapters.
How does BS 10 compare to ASME B16.5 and EN 1092-1?
BS 10 is an imperial-based standard originally developed in the United Kingdom. While ASME B16.5 uses Class ratings (Class 150, 300, etc.) and EN 1092-1 utilizes metric PN designations (PN10, PN16, PN40), BS 10 uses letter tables. Because bolt circle dimensions and thicknesses differ, BS 10 flanges will generally not mate with ASME or EN flanges unless customized adapter flanges are manufactured.
Which material grades do you forge for BS 10 flanges?
We produce BS 10 flanges in ASTM A105 forged carbon steel, ASTM A350 LF2 for low-temperature applications, ASTM A182 austenitic stainless steel (F304/304L, F316/316L, 321), Duplex 2205, Super Duplex 2507, Cu-Ni alloys (90/10, 70/30), Inconel 625, and Hastelloy C276.
What quality test certificates accompany BS 10 shipments?
Every order is dispatched with complete EN 10204 Type 3.1 Mill Test Certificates verifying ladle chemistry, mechanical tensile and yield test results, elongation, impact values (where applicable), and hardness, with full heat number traceability back to the mother ingot.
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