Our Product
MS Blind Flange (BLRF)
Product Overview
MS Blind Flange (BLRF)
Overview
Durable MS Blind Flanges (BLRF) perfect for sealing pipe ends and valve openings. Manufactured to ASTM A105 and ASME B16.5 standards to provide a secure, leak-proof barrier in industrial piping networks.
- Manufactured from premium-quality mild steel
- Precision-machined for accurate installation
- Leak-proof sealing performance
- High strength and pressure resistance
- Excellent durability and long service life
- Easy installation and maintenance
- Suitable for pressure testing and pipeline isolation
Dimension Details
| Pcd (mm) | Size Nb | No Of Holes | Thickness (mm) | Od Of Flange (mm) | Diam.meter Of Bolt (mm) | Diam.meter Of Bore (mm) |
|---|---|---|---|---|---|---|
| 60.3 | 15NB | 4 | 11.1 | 88.9 | 12.7 | 22.40 |
| 69.9 | 20NB | 4 | 12.7 | 98.4 | 12.7 | 27.70 |
| 79.4 | 25NB | 4 | 14.3 | 108.0 | 12.7 | 34.50 |
| 88.9 | 32NB | 4 | 15.9 | 117.5 | 12.7 | 43.20 |
| 98.4 | 40NB | 4 | 17.5 | 127.0 | 12.7 | 49.50 |
| 120.7 | 50NB | 4 | 19.1 | 152.4 | 15.9 | 62 |
| 139.7 | 65NB | 4 | 22.2 | 177.8 | 15.9 | 74.70 |
| 152.4 | 80NB | 4 | 23.8 | 190.5 | 15.9 | 90.70 |
| 190.5 | 100NB | 8 | 23.8 | 228.6 | 15.9 | 116.10 |
| 215.9 | 125NB | 8 | 23.8 | 254.0 | 19.1 | 143.80 |
| 241.3 | 150NB | 8 | 25.4 | 279.4 | 19.1 | 170.70 |
| 298.5 | 200NB | 8 | 28.6 | 342.9 | 19.1 | 221.50 |
| 362.0 | 250NB | 12 | 30.2 | 406.4 | 22.2 | 276.40 |
| 431.8 | 300NB | 12 | 31.8 | 482.6 | 22.2 | 327.20 |
| 476.3 | 350NB | 12 | 34.9 | 533.4 | 25.4 | 349.20 |
| 539.8 | 400NB | 16 | 36.5 | 596.9 | 25.4 | 410.50 |
| 577.9 | 450NB | 16 | 39.7 | 635.0 | 28.6 | 461.80 |
| 635.0 | 500NB | 20 | 42.9 | 698.5 | 28.6 | 513.10 |
All Dimensions in MM
Technical Dimensions
| B | D | C | G | J | A | E | F | A | E | F | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nominal Pipe Size |
Socket Bore dia. B (Note [1]) |
Bore Diameter of Fittings, D [Note (1)] |
Socket Wall Thickness, C | Body Wall | Min Depth of Socket |
Center to Bottom of Socket, A | Laying Lengths |
Tolerances ± | End Wall Thickness Kmin |
||||||||||||||||||||
| Class Designation | Class Designation | Class Designation | 90 deg Elbows, Tees and Crosses |
45 deg Elbows | Class Designation | ||||||||||||||||||||||||
| 3000 | 6000 | 9000 | 3000 | 6000 | 9000 | 3000 | 6000 | 9000 | Class Designation | Coupl- ings, E |
Half Coupl- ings, F |
A | E | F | 3000 | 6000 | 9000 | ||||||||||||
| (mm) | (Inch) | 3000 | 6000 | 9000 | Agv. | Min. | Agv. | Min. | Agv. | Min. | Min. | Min. | Min. | J | 3000 | 6000 | 9000 | 3000 | 6000 | 9000 | |||||||||
| 6 | 1/8 | 11.2 10.8 |
7.6 6.1 |
4.8 3.2 |
..... | 3.18 | 3.18 | 3.96 | 3.43 | ..... | ..... | 2.41 | 3.15 | ..... | 9.5 | 11.0 | 11.0 | ..... | 8.0 | 8.0 | ..... | 6.5 | 16.0 | 1.0 | 1.5 | 1.0 | 4.8 | 6.4 | ..... |
| 8 | 1/4 | 14.6 14.2 |
10.0 8.5 |
7.1 5.6 |
..... | 3.78 | 3.30 | 4.60 | 4.01 | ..... | ..... | 3.02 | 3.68 | ..... | 9.5 | 11.0 | 13.5 | ..... | 8.0 | 8.0 | ..... | 6.5 | 16.0 | 1.0 | 1.5 | 1.0 | 4.8 | 6.4 | ..... |
| 10 | 3/8 | 18.0 17.6 |
13.3 11.8 |
9.9 8.4 |
..... | 4.01 | 3.50 | 5.03 | 4.37 | ..... | ..... | 3.20 | 4.01 | ..... | 9.5 | 13.5 | 15.5 | ..... | 8.0 | 11.0 | ..... | 6.5 | 17.5 | 1.5 | 3.0 | 1.5 | 4.8 | 6.4 | ..... |
| 15 | 1/2 | 22.2 21.8 |
16.6 15.0 |
12.5 11.0 |
7.2 5.6 |
4.67 | 4.09 | 5.97 | 5.18 | 9.35 | 8.18 | 3.73 | 4.78 | 7.47 | 9.5 | 15.5 | 19.0 | 25.5 | 11.0 | 12.5 | 15.5 | 9.5 | 22.5 | 1.5 | 3.0 | 1.5 | 6.4 | 7.9 | 11.2 |
| 20 | 3/4 | 27.6 27.2 |
21.7 20.2 |
16.3 14.8 |
11.8 10.3 |
4.90 | 4.27 | 6.96 | 6.04 | 9.78 | 8.56 | 3.91 | 5.56 | 7.82 | 12.5 | 19.0 | 22.5 | 28.5 | 13.0 | 14.0 | 19.0 | 9.5 | 24.0 | 1.5 | 3.0 | 1.5 | 6.4 | 7.9 | 12.7 |
| 25 | 1 | 34.3 33.9 |
27.4 25.9 |
21.5 19.9 |
16.0 14.4 |
5.69 | 4.89 | 7.92 | 6.93 | 11.38 | 9.96 | 4.55 | 6.35 | 9.09 | 12.5 | 22.5 | 27.0 | 32.0 | 14.0 | 17.5 | 20.5 | 12.5 | 28.5 | 2.0 | 4.0 | 2.0 | 9.6 | 11.2 | 14.7 |
| 32 | 1.1/4 | 43.1 42.7 |
35.8 34.3 |
30.2 28.7 |
23.5 22.0 |
6.07 | 5.28 | 7.92 | 6.93 | 12.14 | 10.96 | 4.85 | 6.35 | 9.70 | 12.5 | 27.0 | 32.0 | 35.0 | 17.5 | 20.5 | 22.5 | 12.5 | 30.0 | 2.0 | 4.0 | 2.0 | 9.6 | 11.2 | 14.2 |
| 40 | 1.1/2 | 49.2 48.8 |
41.6 40.1 |
34.7 33.2 |
28.7 27.2 |
6.35 | 5.54 | 8.92 | 7.80 | 12.70 | 11.12 | 5.08 | 7.14 | 10.15 | 12.5 | 32.0 | 38.0 | 38.0 | 20.5 | 25.5 | 25.5 | 12.5 | 32.0 | 2.0 | 4.0 | 2.0 | 11.2 | 12.7 | 15.7 |
| 50 | 2 | 61.7 61.2 |
53.3 51.7 |
43.6 42.1 |
38.9 37.4 |
6.93 | 6.04 | 10.92 | 9.50 | 13.84 | 12.12 | 5.54 | 8.74 | 11.07 | 16.0 | 38.0 | 41.0 | 54.0 | 25.5 | 28.5 | 28.5 | 19.0 | 41.0 | 2.0 | 4.0 | 2.0 | 12.7 | 15.7 | 19.0 |
| 65 | 2.12 | 74.4 73.9 |
64.2 61.2 |
..... | ..... | 8.76 | 7.67 | ..... | ..... | ..... | ..... | 7.01 | ..... | ..... | 16.0 | 41.0 | ..... | ..... | 28.5 | ..... | ..... | 19.0 | 43.0 | 2.5 | 5.0 | 2.5 | 15.7 | 19.0 | ..... |
| 80 | 3 | 90.3 89.8 |
79.4 76.4 |
..... | ..... | 9.52 | 8.30 | ..... | ..... | ..... | ..... | 7.62 | ..... | ..... | 16.0 | 57.0 | ..... | ..... | 32.0 | ..... | ..... | 19.0 | 44.5 | 2.5 | 5.0 | 2.5 | 19.0 | 22.4 | ..... |
| 100 | 4 | 115.7 115.2 |
103.8 100.7 |
..... | ..... | 10.69 | 9.35 | ..... | ..... | ..... | ..... | 8.56 | ..... | ..... | 19.0 | 66.5 | ..... | ..... | 41.0 | ..... | ..... | 19.0 | 48.0 | 2.5 | 5.0 | 2.5 | 22.4 | 28.4 | ..... |
WHY OUR MS BLIND FLANGE (BLRF) MATTERS
Engineered For Secure Pipe Closure, Leak-Proof Sealing & Reliable Industrial Performance
Our MS Blind Flange (BLRF) is manufactured from premium-quality mild steel to provide a secure and leak-proof closure for piping systems. Designed for high strength and dimensional accuracy, it is ideal for sealing pipe ends, pressure testing, maintenance operations, and future pipeline expansion across demanding industrial applications.
Leak-Proof Pipe Closure
Provides a strong and reliable seal to safely close the end of piping systems.
Heavy-Duty Construction
Manufactured from premium-quality mild steel for maximum strength and durability.
Precision Machined Finish
Ensures accurate fitment, dependable sealing, and long service life.
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FREQUENTLY ASKED QUESTIONS
Frequently Asked Questions About Our MS Blind Flange (BLRF)
Find answers to the most common questions about our MS Blind Flange (BLRF), including materials, standards, applications, pressure performance, and installation.
“Our MS Blind Flange (BLRF) delivers secure sealing, dependable strength, and long-lasting performance for industrial piping systems.”
Our MS Blind Flanges are manufactured from premium-quality mild steel, ensuring excellent strength, durability, and reliable sealing performance.
A Blind Flange is used to seal the end of a piping system, allowing safe isolation for maintenance, pressure testing, and future pipeline expansion.
They are widely used in oil & gas, petrochemical, chemical processing, water treatment, power plants, and general industrial piping systems.
