BS 4504 Standard Carbon Steel Stainless Steel Slip on Flange Used for Pipeline System

• Customization: Available
• Standard: ANSI, DIN, GB, JIS, GOST, BSW, GOST Atk 24.200.02.90
• Type: Welding Flange
• Model NO.: BS 4504 SO
• Material: Stainless Steel,Carbon Steel,Alloy Steel
• Structure: Flanges
• Connection: Welding
• Sealing Surface: BS
• Manufacturing Way: Forging
• Technics: Forged
• Product Name: Blind Flange
• Model Number: BS 4504
• Certificate: ISO, CE, PED, BV, Ks
• Usage: Joining Pipe Lines
• Pressure: Pn6 Pn10 Pn16 Pn25 Pn40
• Transport Package: Wooden Box
• Specification: DN10-DN2000
• Trademark: Maitolead
• Origin: Hebei, China
• HS Code: 7307210000
• Production Capacity: 1000000piece/Year
• Package Size: 48.50cm * 32.00cm * 18.00cm
• Package Gross Weight: 100.000kg

Product Description

BS 4504 PN40 Stainless Steel Plate Flange

A Plate Flange is a flat, round flange manufactured directly from steel plate, without a hub or neck. It is mainly used for piping systems where space is limited and pressure requirements are relatively low. Plate flanges are widely applied in water supply, HVAC, fire protection, and general industrial pipelines.

This type of flange is typically welded directly to the pipe, providing a simple structure and easy installation. Compared with welding neck or slip-on flanges, plate flanges offer a cost-effective solution while maintaining reliable sealing performance when used with appropriate gaskets and bolts.

Plate flanges can be produced according to standards such as EN 1092-1, DIN, GOST, BS, and SABS 1123, with various pressure ratings and sizes available. Materials include carbon steel, stainless steel, and alloy steel, making them suitable for different working conditions and media.

Installation Process

To ensure safe and leak-free operation, follow these installation steps:

Verify Specifications
Confirm size, table rating (D/E/F/H), material, and bolt pattern match the mating flange.
Inspect Flange Faces
Ensure sealing surfaces are clean, smooth, and free from scratches or debris.
Select Suitable Gasket
Choose gasket material based on pressure, temperature, and service medium
(rubber, CNAF, PTFE, or spiral wound gasket).
Align Bolt Holes
Position the blank plate flange accurately against the mating flange.
Tighten Bolts Evenly
Use a cross-tightening sequence and apply torque gradually and uniformly.
Leak & Pressure Testing
Conduct hydrostatic or pneumatic testing after installation to confirm sealing integrity.
Note: Always follow recommended torque values and gasket manufacturer guidelines.

Model Number:	BS4504 PLATE 105
Standard:	BS4504 PLATE105 PN6 PN10 PN16 PN25 PN40
Product name:	Plate Flange
Material:	Q235 /A105/ ST37/S235JR/ CT20 /SS400/16MN/SS321/SS304/SS316/S235/P245GH/P250/P91/904L
Pressure:	PN6 PN10 PN16 PN25 PN40
Technics:	Forged
Connection:	Welding
Packing:	Plywood cases\wooden Pallets
Certificate:	ISO, CE, PED, BV, KS
Surface Antirust:	Antirust light oil, Black paint coating,Yellow paint coating or Red paint coating,Galnavized (Hot galvanized or Cold galvanized or Electro Galvanized)
Usage:	Joining Pipe Lines

ABOUT US

The maitolead group's flange and pipe fittings factory was established in 2017, we are a professional manufacturer focusing on flanges, pipe fittings, and elbows.made of different materials (stainlesssteel, carbon steel, alloy steel, etc.. We are a physical manufacturer integrating customization, processing, production, sales and export trade. we have a stock of over 2000 tons and produce and sell over 20 tons of spot goods daily. The company's products are exported to more than 30 countries and regions including Europe, America, and Asia.

we are main production equipment of the company includes forging hammers, ring-rolling machine, lathes, drillers, pushing machine, presses, shot blasting machine etc. Materials available are carbon steel, stainless steel and alloy steel. Products are manufactured in accordance with international standards such as ANSI,DIN, EN1092, JIS, BS, GOST standards or with customers special requirement and design. we owns certificates of CE, PED, ISO, BV, KS. in addition, Maitolead Group gives test certificate, which are compliant to EN 10204 3, 1B and contains physical and chemical testing.

Available Standards
ANSI / ASME B16.5 (Class 150 / 300 / 600 / 900)
EN 1092-1 (PN6 / PN10 / PN16 / PN25 / PN40)
DIN / BS / JIS / GOST (available upon request)

Flange Types
Weld Neck (WN) / Slip-On (SO) / Blind (BL) / Threaded (TH) / Socket Weld (SW) / Lap Joint (LJ) / Plate Flange (PL)

Surface Treatment
Anti-rust oil / Black paint / Zinc plated / Hot-dip galvanized (optional)

Our products are widely used in petroleum, chemical, machinery, electric power, metallurgy, and coal mine construction, and have earned high praise and trust from customers worldwide.

Customization Support

We provide material customization, size customization, drawing-based non-standard flange fabrication, and packaging customization (carton / pallet / wooden case with OEM labeling).

                   10+

                           years of

manufacturing experience

.                                  50000

           tons of exports per

                        year

              30+

            project partners

PRODUCT INFORMATION

Flange,also called flange disc or flange. The flange is a part connected between the shaft and the shaft, which is used for the connection between the pipe ends; It is also useful in the flange on the import and export of the equipment for the connection between two devices, such as the reducer flange. Flange connection or flange joint refers to a detachable connection which is connected by flanges, gaskets and bolts as a group of combined sealing structures. 

Because the flange has good comprehensive performance, it is widely used in chemical industry, construction, water supply,drainage, petroleum, light and heavy industry, refrigeration, health, water heating, fire, power, aerospace, shipbuilding and other basic projects.

Product Parameter
Standards	ANSI	ANSI B16.5 ASME B16.47 series A/B
	DIN	DIN2635
	EN	EN1092-1:2002
	JIS	JIS B2220-2004, KS D3576, KS B6216 KS B1511-2007 JIS B2261; JIS B8210
	BS	BS4504 BS10 Table D/E
Material	ANSI	SS ANSI 304(L); ANSI 316(L); Duplex Steel ASTM A182; S31803; S32205
	DIN	CS RST37.2;S235JR SS 304/304L,316/316L
	EN	CS RST37.2;S235JR;C22.8SS 304/304L,316/316L
	JIS	SS400,SF440 SS 304/304L, 316/316L
	BS	CSRST37.2;S235JR;C22.8;Q235SS 304/304L,316/316
Pressure	ANSI	Class 150, 300, 600, 900, 1500, 2500lbs
	DIN	PN6,PN10,PN16,PN25,PN40,PN64,PN100
	EN	PN6,PN10,PN16,PN25,PN40,PN64,PN100
	JIS	1K,2K,5K,10K,16K,20K,30K,40K
	BS	PN6,PN10,PN16,PN25,PN40,PN64,PN100
Size	ANSI	1/2″ – 48″
	DIN	DN15-DN1200
	EN	DN15-DN1200
	JIS	15A-1500A
	BS	DN15-DN1200
Packaging	Loose package; Packaged in bundles(2Ton Max); bundled pipes with two slings at the both end for easy loading and discharging; End with Plastic caps; wooden cases.
Test	Chemical Component Analysis, Mechanical Properties, Technical Properties, Exterior Size Inspection, hydraulic testing , X-ray Test.
Application	Light and heavy industry, refrigeration, health, water heating, fire, power, aerospace, shipbuilding and other basic projects.

Main production process

PRODUCTION LINE

Product Inspection

PACKING&SHIPING

FAQ

Q1: What is BS 4504 Code 105?
BS 4504 Code 105 corresponds to PN40 pressure rating, defining flange dimensions and pressure performance.

 
Q2: Can BS 4504 blind flanges be used as permanent closures?
Yes. They are suitable for both permanent sealing and temporary isolation, depending on system design.

 
Q3: Are BS 4504 blind flanges interchangeable with EN 1092-1 flanges?
BS 4504 is the predecessor of EN 1092-1. While many dimensions are similar, interchangeability should be confirmed case by case, especially for PN40 systems.

 
Q4: Which gasket type is recommended for PN40 applications?
Spiral wound or metal-reinforced gaskets are commonly recommended for high-pressure PN40 systems.

 
Q5: Are custom materials, sizes, or markings available?
Yes. Custom sizes, materials, coatings, and project-specific markings can be supplied upon request.