Stainless Steel Blind Flange
Product Details
Zhejiang Leadtek Fluid Technology Co., Ltd. is one of the most experienced manufacturers and suppliers of stainless steel blind flange in China. Please feel free to buy customized stainless steel blind flange at competitive price from our factory. Also, free sample is available.
Product Overview
Stainless Steel Blind Flange is a solid-center flange used to permanently or temporarily seal the end of a pipe, nozzle, or vessel opening. Unlike other flange types, it has no bore - the face is completely closed, with bolt holes distributed around the circumference to match the mating flange. Available in flat face (FF), raised face (RF), ring type joint (RTJ), and tongue-and-groove configurations, the Stainless Steel Blind Flange provides a pressure-tight, leak-free closure that withstands full line pressure without an internal support structure.
Its solid construction makes it the preferred isolation solution in petrochemical pipelines, water treatment systems, offshore platforms, and industrial maintenance applications where a section needs to be safely closed for inspection, cleaning, or future expansion.
Material Specifications
| Grade | Standard | Typical Application |
|---|---|---|
| SS304 / 304L | ASTM A182 F304/F304L | General industrial, water systems, mild chemicals |
| SS316 / 316L | ASTM A182 F316/F316L | Marine, chemical, food & pharmaceutical |
| SS321 | ASTM A182 F321 | High-temperature oxidation-resistant applications |
| Duplex 2205 | ASTM A182 F51 | Offshore, chloride-rich environments |
All material is accompanied by traceable Mill Test Certificates (MTC 3.1). PMI (Positive Material Identification) testing available on request.
Standards & Pressure Ratings
Leadtek manufactures blind flanges to the following international standards:
ASME B16.5
Class 150 / 300 / 600 / 900 / 1500 / 2500
EN 1092-1
PN 10 / 16 / 25 / 40
JIS B2220
5K / 10K / 16K / 20K
ISO 7005
Upon request
Non-standard pressure classes and custom bore-and-face combinations are available based on customer drawings.
Facing Types
Flat Face (FF)
Raised Face (RF) - most common, 1.6mm or 6.4mm height
Ring Type Joint (RTJ)
Tongue & Groove (T&G)
Concave & Convex (M&F)
ASME B16.5 Class 150 Blind Flange - Dimension Table (mm)
Dimension List of Blind Flange ANSI (mm)
|
Size |
OD |
Bolt Circle |
Bolt Hole |
Sealing Face |
Thickness |
||
|
Inch |
DN |
BC |
B |
R |
RF |
T |
|
|
1/2" |
15 |
88.9 |
60.5 |
15.7 x 4 |
35.1 |
1.6 |
11.2 |
|
3/4" |
20 |
98.6 |
69.9 |
15.7 x 4 |
42.9 |
1.6 |
12.7 |
|
1" |
25 |
108 |
79.3 |
15.7 x 4 |
50.8 |
1.6 |
14.2 |
|
11/4" |
32 |
117.3 |
88.9 |
15.7 x 4 |
63.5 |
1.6 |
15.7 |
|
11/2" |
40 |
127 |
98.6 |
15.7 x 4 |
73.15 |
1.6 |
17.5 |
|
2" |
50 |
152.4 |
120.7 |
19.1 x 4 |
91.9 |
1.6 |
19.1 |
|
21/2" |
65 |
177.8 |
139.7 |
19.1 x 4 |
104.6 |
1.6 |
22.4 |
|
3" |
80 |
190.5 |
152.4 |
19.1 x 4 |
127 |
1.6 |
23.9 |
|
4" |
100 |
228.6 |
190.5 |
19.1 x 8 |
157.2 |
1.6 |
23.9 |
|
5" |
125 |
254 |
215.9 |
22.4 x 8 |
185.7 |
1.6 |
23.9 |
|
6" |
150 |
279.4 |
241.3 |
22.4 x 8 |
215.9 |
1.6 |
25.4 |
|
8" |
200 |
342.9 |
298.5 |
22.4 x 8 |
269.7 |
1.6 |
28.4 |
|
10" |
250 |
406.4 |
362 |
25.4 x 12 |
323.9 |
1.6 |
30.2 |
|
12" |
300 |
482.6 |
431.8 |
25.4 x 12 |
381 |
1.6 |
31.75 |
|
14" |
350 |
533.4 |
476.3 |
28.4 x 12 |
412.8 |
1.6 |
35.1 |
|
18" |
450 |
635 |
577.9 |
31.8 x 16 |
533.4 |
1.6 |
39.6 |
|
20" |
500 |
698.5 |
635 |
31.8 x 20 |
584.2 |
1.6 |
42.9 |
|
24" |
600 |
812.8 |
749.3 |
35.1 x 20 |
692.2 |
1.6 |
47.8 |
Dimensions for Class 300–2500 and EN/JIS standards available upon request.
Applications
Stainless Steel Blind Pipe Flange is used wherever a pipeline end requires a secure, pressure-rated closure:
Petrochemical & Refinery
Isolating process lines during turnaround maintenance
Water & Wastewater Treatment
Capping branch lines in distribution systems
Marine & Offshore
Sealing unused nozzles on vessels and storage tanks
Pharmaceutical & Food Processing
Hygienic dead-end closures in sanitary pipelines
Fire Protection Systems
Terminating sprinkler branch lines
Power Generation
Iisolating boiler feed lines and steam headers
Customization Capabilities
As a manufacturer with over 30 years of precision casting and CNC machining experience, Leadtek accepts custom orders for:
- Non-standard flange OD, thickness, or bolt circle
- Special alloys (Inconel, Hastelloy, titanium) on request
- Custom facing dimensions and surface finishes
- Private label / OEM packaging
- Small MOQ for samples and trials
Engineering drawings (DXF/DWG/PDF) accepted. Technical review within 24 hours.
Why Choose Leadtek
- Manufacturer, not a trader - 37,000 m² factory with 400+ CNC machines and 300+ skilled workers
- Full in-house quality control - precision casting → machining → pickling & passivation → 100% pressure testing
- Certifications - ISO 9001, ISO 14001, CE, KC; 40+ patents
- Global reach - products supplied to 80+ countries including USA, Germany, Italy, South Korea, Saudi Arabia
- Traceable materials - MTC 3.1 reports standard; PMI available on request
- Fast lead time - standard sizes typically ship within 7–15 business days; sample lead time 5–7 days
From Our Knowledge Base
Selecting the right stainless steel fitting starts with three questions: what's the medium, what's the pressure, and what standard does your project follow. Our article How To Select The Right Stainless Steel Fittings: A Professional Engineer's Selection Guide walks through material grade selection (304L vs 316L vs Duplex 2205), pressure class logic, and connection standards - the same decisions that apply when specifying a Stainless Steel Blind Flange for your pipeline system.
FAQ
Q: What is your minimum order quantity?
A: No strict MOQ for standard sizes. Sample orders of 1–5 pcs are welcome. For bulk orders, contact us for volume pricing.
Q: Can you provide material certificates?
A: Yes. MTC 3.1 material reports are provided as standard. PMI testing is available upon request.
Q: What is the lead time?
A: Standard sizes: 7–15 business days. Custom or large-diameter flanges: 15–25 business days. Samples: 5–7 business days.
Q: Do you accept custom drawings?
A: Yes. We accept DXF, DWG, PDF, and STEP files. Technical feedback within 24 hours.
Q: What's the difference between a blind flange and a plate flange?
A: Both are solid-face flanges without a bore, but a plate flange is designed to be welded to a pipe end and paired with another flange in the system, while a blind flange is specifically used to terminate or block a pipe end entirely.
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