Stainless steel flanges – AISI 304 / 304L and 316 / 316L
We supply plate, blind, weld neck and threaded flanges in AISI 304 / 304L and 316 / 316L stainless steel to EN 1092-1 and ASME B16.5. PN 16 stainless plate flanges from DN 15 to DN 300 are in stock in both 304 and 316, with EN 10204 3.1 certificates on request.
Technical summary
- Material
- AISI 304 (1.4301), 304L (1.4307), 316 (1.4401), 316L (1.4404)
- Forged equivalent
- ASTM A182 F304 / F304L / F316 / F316L
- Types
- Plate (Type 01), blind (Type 05), weld neck (Type 11), threaded (Type 13), slip-on
- Standards
- EN 1092-1, ASME B16.5 / B16.47
- Stock
- PN 16 plate flanges DN 15 – DN 300 in 304 and 316; other sizes to order
- Certificate
- EN 10204 3.1 material certificate on request
PN16 stainless steel plate flanges – stock sizes and list prices
EN 1092-1 Type 01 PN 16 stainless plate flanges, AISI 304 and 316, DN 15 – DN 300, kept in stock in Istanbul.
| Size | OD D (mm) | Bolt circle K (mm) | Holes | Thickness (mm) | AISI 304 | AISI 316 |
|---|---|---|---|---|---|---|
| DN15 | 95 | 65 | 4 × Ø14 | 14 | $15.00 | $27.00 |
| DN20 | 105 | 75 | 4 × Ø14 | 16 | $20.00 | $37.00 |
| DN25 | 115 | 85 | 4 × Ø14 | 16 | $21.00 | $41.00 |
| DN32 | 140 | 100 | 4 × Ø18 | 18 | $35.00 | $67.00 |
| DN40 | 150 | 110 | 4 × Ø18 | 18 | $38.00 | $75.00 |
| DN50 | 165 | 125 | 4 × Ø18 | 20 | $45.00 | $90.00 |
| DN65 | 185 | 145 | 8 × Ø18 | 20 | $59.00 | $113.00 |
| DN80 | 200 | 160 | 8 × Ø18 | 20 | $67.00 | $126.00 |
| DN100 | 220 | 180 | 8 × Ø18 | 22 | $81.00 | $159.00 |
| DN125 | 250 | 210 | 8 × Ø18 | 22 | $100.00 | $194.00 |
| DN150 | 285 | 240 | 8 × Ø22 | 24 | $137.00 | $265.00 |
| DN200 | 340 | 295 | 12 × Ø22 | 26 | $182.00 | $357.00 |
| DN250 | 405 | 355 | 12 × Ø26 | 29 | $280.00 | $532.00 |
| DN300 | 460 | 410 | 12 × Ø26 | 32 | $370.00 | $718.00 |
2026 list prices in USD per piece, ex works Istanbul, excluding VAT and freight. Quantity discounts apply; your quotation is given in USD or EUR. Weight is practically the same as the carbon steel flange.
304 or 316L?
- 304 / 304L: drinking and process water, food, dairy, pharmaceutical, general stainless piping
- 316 / 316L: chemicals, seawater, swimming pools and chlorinated water, wastewater treatment, coastal plants
- For welded lines, choose the low-carbon L grades (304L, 316L)
Ordering and installation notes
- State grade (304, 304L, 316, 316L), flange type, DN and PN
- Use stainless bolts on stainless lines: A2 for 304, A4 for 316
- Avoid contact with carbon steel tools – it can leave rust stains on the surface
- Stainless elbows, tees, caps and reducers can be supplied in the same order
Why Yazıcı Endüstri?
We have manufactured flanges and pipe fittings in our own factory in Esenyurt, Istanbul since 1998. Plasma cutting, CNC turning and drilling, welding and inspection are all done under one roof, so we control lead time and quality without middlemen.
Export and shipping
- Quotations in USD or EUR, usually within the working day
- Seaworthy packing on pallets or in wooden crates
- EN 10204 3.1 material certificates and marking on each flange
- Shipments by road, sea and air from Istanbul
What to include in your enquiry
- Standard (EN 1092-1 or ASME B16.5) and pressure class (PN or Class)
- Size (DN or inch) and quantity
- Material grade and face type (RF, FF, RTJ)
- Certificate and coating requirements, if any
Frequently asked questions
What is the difference between 304 and 316 stainless steel flanges?
316 and 316L contain molybdenum, which makes them more resistant than 304 to chlorides, seawater and many chemicals; they cost roughly twice as much. 304 is used for water, food and general piping, 316L for chemical, marine and chlorinated water service.
What does the L in 304L and 316L mean?
L stands for low carbon. It reduces the risk of intergranular corrosion after welding, so 304L and 316L are preferred for welded lines.
Which bolts should be used with stainless steel flanges?
Use stainless bolts: A2 grade for 304 and A4 grade for 316. Carbon steel bolts will rust and can cause galvanic corrosion.
Which stainless flange sizes do you keep in stock?
PN 16 plate flanges in 304 and 316 from DN 15 to DN 300 are kept in stock. Larger sizes, other pressure classes, blind and weld neck stainless flanges and ASME B16.5 sizes are made to order.