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ختم ملصق

ختم ملصق
تصنيف: أجزاء مُشكَّلة
Applications: قطع غيار ومكونات صناعية
Best Ring Industrial Corporation
Best Ring Industrial Corporation
بلد: تايوان
هاتف: 886-3-928-7999
فاكس: 886-3-928-0377
الشخص الذي يمكن الاتصال به: خدمة عملاء تشينتسي
الاستفسار الآن

Bonded Seal (Dowty Seal)

A Bonded Seal is a hybrid sealing component combining a metal washer with an elastomeric sealing ring bonded to its inner diameter. Originally developed by the Dowty Group, they are widely recognized as Dowty Seals or Bonded Washers.

Structure & Sealing Principle

01

Metal Outer Ring

Provides mechanical strength. Prevents deformation under high torque and limits over-compression.

02

Elastomer Inner Ring

The primary gasket. Compresses against mating surfaces to create a hermetic seal upon tightening.

03

Bonded Interface

Vulcanized directly onto the metal, ensuring adhesion and preventing shifting during high-pressure cycles.

Key Advantages

High-Pressure Reliability Effective in both low and extreme high-pressure environments.
Simple Installation No special grooves or machined housings required.
Material Versatility Various metal/elastomer combos for different temperatures & fluids.
Vibration Resistance Absorbs vibrations, preventing bolt loosening and leakage.
Self-Centering Ensures perfect alignment during installation.

Common Materials

Component Typical Materials
Metal Ring Carbon Steel (Zinc Plated), Stainless Steel (304/316)
Elastomer Ring NBR FKM EPDM

Original Range - British Imperial

Original Range Diagram
THREAD DIA M SIZE REFERENCE D
+0.13 / -0.00		 d
±0.13		 d₁
±0.13		 S R
±0.13		 P RADIAL GAP G +0.07
INCH BSP *** Ref INCH BSP
6BA   001 1 6.35 3.05 4.09 / 4.16 1.22 0.54 0.2 / 0.38 0.13  
4BA   002 2 7.26 4.12 5.26 1.22 0.57 0.2 / 0.38 0.26  
2BA   003 3 8.38 5.21 6.35 1.22 0.57 0.2 / 0.38 0.26  
1/4   004 4 13.21 6.86 8.00 1.22 0.57 0.2 / 0.38 0.26  
1/4   005 5 13.34 6.99 9.53 1.22 0.57 0.2 / 0.38 0.32  
5/16   006 6 13.34 8.31 9.53 1.22 0.56 0.2 / 0.38 0.19  
5/16   007 7 14.22 8.64 10.04 1.22 0.70 0.2 / 0.38 0.35  
3/8 1/8 020 A 15.88 10.37 11.84 2.00 0.57 0.25 / 0.51 0.26  
-40   008 8 18.36 11.26 12.45 2.00 0.60 0.25 / 0.51 0.55  
7/16   009 9 19.05 11.69 13.08 2.00 0.70 0.25 / 0.51 0.29  
1/2 1/4 021 B 20.57 13.74 15.21 2.00 0.73 0.25 / 0.51 0.52 0.29
9/16   010 10 22.23 14.86 16.39 2.00 0.76 0.25 / 0.51 0.29  
-60   022 BB 22.23 15.83 17.30 2.00 0.73 0.25 / 0.51 0.30  
5/8   011 11 25.40 16.51 18.75 2.00 1.12 0.25 / 0.51 0.32  
  3/8 023 C 23.80 17.28 18.75 2.00 0.73 0.25 / 0.51   0.31
11/16   012 12 25.40 18.16 19.69 2.34 0.76 0.25 / 0.51 0.35  
3/4   024 CC 26.92 19.69 21.21 2.34 0.76 0.25 / 0.51 0.32  
13/16 1/2 025 D 28.58 21.54 23.01 2.34 0.73 0.25 / 0.51 0.45 0.29
7/8 5/8 026 E 31.75 23.49 24.97 2.34 0.74 0.25 / 0.51 0.63 0.29
15/16   013 13 33.27 24.26 26.04 2.34 0.89 0.25 / 0.51 0.23  
1 3/4 027 F 34.93 27.05 28.53 2.34 0.74 0.25 / 0.51 0.82 0.30
1-1/16   028 FF 38.61 27.82 30.61 2.34 1.40 0.25 / 0.51 0.41  
1-1/8   014 14 36.58 29.33 30.86 2.34 0.76 0.25 / 0.51 0.38  
1-3/16 7/8 029 G 38.10 30.81 32.39 2.34 0.74 0.25 / 0.51 0.33 0.30
1-1/4   015 15 41.40 32.64 35.69 3.25 1.52 0.25 / 0.51 0.45  
1-5/16 1 030 H 42.80 33.89 36.88 3.25 1.50 0.25 / 0.51 0.28 0.40
1-5/16 1 031 HH 42.80 33.89 36.88 2.34 1.50 0.25 / 0.51 0.28 0.40
1-3/8   016 16 44.45 35.94 38.99 3.25 1.52 0.25 / 0.51 0.51  
1-1/2   017 17 47.75 38.96 42.04 3.25 1.54 0.25 / 0.51 0.43  
1-5/8 1-1/4 032 J 52.38 42.93 45.93 3.25 1.50 0.25 / 0.51 0.82 0.51
1-3/4   018 18 57.15 45.34 48.39 3.25 1.52 0.25 / 0.51 0.45  
1-7/8 1-1/2 033 K 58.60 48.44 51.39 3.25 1.47 0.25 / 0.51 0.40 0.32
2   019 19 63.50 51.69 54.74 3.25 1.52 0.25 / 0.51 0.45  
2-1/8 1-3/4 034 L 69.85 54.89 58.30 3.25 1.70 0.25 / 0.51 0.45 0.57
2-1/4   035 LL 70.36 58.04 61.09 3.25 1.52 0.25 / 0.51 0.45  
  2 036 M 73.03 60.58 63.63 3.25 1.52 0.25 / 0.51   0.48
2-1/2   037 MM 77.72 64.39 67.44 3.25 1.52 0.25 / 0.51 0.45  
  2-1/4 038 N 79.50 66.68 69.98 3.25 1.65 0.25 / 0.51   0.59
  2-1/2 039 P 90.17 76.08 79.38 3.25 1.65 0.25 / 0.51   0.45

Self-Centring BSP Range

Self-Centring BSP Range Diagram
BSP Thread Size
Diameter M		 Size Reference D d
±0.13		 d1 S P Centralising Lip R
±0.13
1/8 820 15.88 10.37 11.84 2.00 ±0.1 0.25 / 0.51 8.26 0.73
1/4 821 20.57 13.74 15.21 2.00 ±0.1 0.25 / 0.51 11.18 0.73
3/8 823 23.80 17.28 18.75 2.00 ±0.1 0.25 / 0.51 14.67 0.73
1/2 825 28.58 21.54 23.01 2.34 +0.26/-0.0 0.25 / 0.51 18.24 0.73
5/8 826 31.75 23.49 24.97 2.34 +0.26/-0.0 0.25 / 0.51 20.27 0.74
3/4 827 34.93 27.05 28.53 2.34 +0.26/-0.0 0.25 / 0.51 23.83 0.74
7/8 829 38.10 30.81 32.29 2.34 +0.26/-0.0 0.25 / 0.51 27.51 0.74
1 830 42.80 33.89 36.88 3.25 +0.26/-0.0 0.25 / 0.51 29.92 1.5
1-1/4 832 52.38 42.93 45.93 3.25 +0.26/-0.0 0.25 / 0.51 38.45 1.5
1-1/2 833 58.60 48.44 51.39 3.25 +0.26/-0.0 0.25 / 0.51 44.45 1.47
1-3/4 834 69.85 54.89 58.30 3.25 +0.26/-0.0 0.25 / 0.51 50.42 1.7
2 836 73.03 60.58 63.63 3.25 +0.26/-0.0 0.25 / 0.51 56.26 1.52
2-1/4 838 79.50 66.68 69.98 3.25 +0.26/-0.0 0.25 / 0.51 62.36 1.65
2-1/2 839 90.17 76.08 79.38 3.25 +0.26/-0.0 0.25 / 0.51 71.50 1.65

German Metric Range

German Metric Range Diagram
Thread Size
DIA M		 Size Reference D
+0.13 / -0.00		 d
±0.10		 d1
±0.10		 S R
±0.10		 P
+0.25 / -0.00		 Radial Gap G
±0.05
3.5 201 7.2 4.1 5.2 1.0 ±0.1 0.55 0.3 0.30
4 202 7 4.5 5.4 1.0 ±0.1 0.45 0.3 0.25
5 203 9 5.7 6.8 1.0 ±0.1 0.65 0.3 0.35
6 206 10 6.7 8 1.0 ±0.1 0.65 0.3 0.35
6 207 11 6.7 8.2 1.0 ±0.1 0.75 0.3 0.35
5.5 205 9.2 6.2 7.2 1.0 ±0.1 0.50 0.3 0.35
6.5 209 12 7.1 8.8 1.0 ±0.1 0.85 0.3 0.30
6.7 210 10.2 7.3 8.6 1.0 ±0.1 0.65 0.3 0.30
8 211 13.4 8.5 9.4 1.0 ±0.1 0.45 0.3 0.25
8 212 13 8.7 10 1.0 ±0.1 0.65 0.3 0.35
8 213 14 8.7 10.4 1.0 ±0.1 0.85 0.3 0.35
8 214 16 8.7 10.4 1.0 ±0.1 0.85 0.3 0.35
8.5 215 13.3 9.3 10.5 1.0 ±0.1 0.6 0.3 0.40
10 216 16 10.35 12 2.0 ±0.1 0.82 0.4 0.17
10 217 16 10.7 12.4 2.0 ±0.1 0.85 0.4 0.35
10 218 18 10.7 12.4 2.0 ±0.1 0.85 0.4 0.35
11 219 16.3 11.4 12.7 1.5 ±0.1 0.65 0.4 0.20
11 220 18.5 11.8 13.7 1.5 ±0.1 0.95 0.4 0.40
11 221 19.1 11.8 13.5 1.5 ±0.1 0.85 0.4 0.40
12 222 18 12.7 14.4 1.5 ±0.1 0.85 0.4 0.35
12 223 20 12.7 14.4 1.5 ±0.1 0.85 0.4 0.35
13 224 20 13.7 15.4 1.5 ±0.1 0.85 0.4 0.35
13 225 22 13.7 15.4 1.5 ±0.1 0.85 0.4 0.35
13.5 226 18.7 14 15.7 1.5 ±0.1 0.85 0.4 0.25
14 227 22 14.7 16.4 1.5 ±0.1 0.85 0.4 0.35
15 228 22.7 16 17.78 1.5 ±0.1 0.89 0.4 0.50
16 229 24 16.7 18.4 1.5 ±0.1 0.85 0.4 0.35
17 230 24 17.4 19.2 1.5 ±0.1 0.9 0.4 0.20
17.5 231 24.7 18 20.1 1.5 ±0.1 1.05 0.4 0.25
18 232 26 18.7 20.4 1.5 ±0.1 0.85 0.4 0.35
20 233 28 20.7 22.5 1.5 ±0.1 0.9 0.4 0.35
21 234 28.7 21.5 23.3 2.5 ±0.15 0.9 0.4 0.25
22 235 28 22.5 24.2 1.5 ±0.1 0.85 0.4 0.35
22 236 30 22.7 24.4 2.0 ±0.1 0.85 0.4 0.35
22 237 30 22.7 24.4 3.0 ±0.1 0.85 0.4 0.35
24 238 32 24.7 26.4 2.0 ±0.1 0.85 0.4 0.35
27 240 36 27.2 29 2.0 ±0.1 0.9 0.4 0.10
30 242 39 31 33 2.0 ±0.1 1 0.4 0.50
33 243 42 33.7 35.8 2.0 ±0.1 1.05 0.4 0.35
33 244 43 34.3 36.4 2.0 ±0.1 1.05 0.4 0.65
36 245 46 36.7 38.8 2.0 ±0.1 1.05 0.4 0.35
39 246 51 40 41.9 2.5 ±0.1 0.95 0.4 0.50
42 247 53 42.7 44.4 2.5 ±0.1 0.85 0.4 0.35
48 248 59 48.7 50.8 2.5 ±0.1 1.05 0.4 0.35
51 249 60 52 54.1 3.0 ±0.15 0.95 0.4 0.50
52 250 64.5 53.3 56.4 3.0 ±0.15 0.95 0.4 0.50
60 251 73 60.7 63 3.0 ±0.15 1.15 0.4 0.35
68 252 79.5 68.6 72.1 3.5 ±0.15 1.75 0.4 0.30
75 253 90.3 76.08 79.1 3.38 ±0.15 1.51 0.4 0.54
88 254 101.48 89.09 92.1 3.25 ±0.15 1.5 0.4 0.54
125 255 143.67 127 132.7 5.0 ±0.15 1 0.4 0.50

Typical Applications

Bonded seals are the preferred solution for static sealing in demanding industries:

  • Hydraulic & Pneumatic Systems:
    Sealing cylinder ports and hose connections.
  • Fluid Power Assemblies:
    Critical seals for manifolds and pressure gauges.
  • Automotive & Diesel Engines:
    Fuel injection systems and oil drain plugs.
  • Pipe Fittings & Flanges:
    Ensuring leak-free joints in industrial piping.
  • Industrial Machinery:
    High-performance sealing for valves and pumps.
Application 1
Application 2
Application 3
Application 4

Request Technical Specifications

Need help choosing the right metal-to-elastomer combination?
Our technical team can provide detailed dimension charts and material compatibility guides for your specific application.

Contact Our Team ✉️

Bonded Seals (Dowty Seals) FAQ

Technical Guide to Metal-Rubber Sealing Washers

1. What is a bonded seal?

A specialized sealing washer consisting of a metal outer ring bonded to an elastomer inner ring. Known as Dowty® seals, this hybrid design offers high-integrity sealing with structural support.

2. Common Applications

Hydraulic Fittings Banjo Bolts Threaded Ports Pumps & Valves Vibration Environments

3. How does it work?

01
Compression

Elastomer compresses against surfaces, filling irregularities.

02
Structural Limit

Metal ring acts as a "stop," preventing over-compression.

03
Load Distribution

Sealing force is distributed evenly without groove machining.

4. Material Options

Elastomer Elements
  • NBR: Standard for oil/fuel.
  • EPDM: For water, steam, glycol.
  • FKM: High temp & chemicals.
Metal Rings
  • Carbon Steel: General industrial use.
  • Stainless Steel: Corrosive environments.
  • Brass: Plumbing/low-friction.

5. Bonded Seals vs. O-Rings

Feature Bonded Seal O-Ring
Installation ✔ Under bolt head Requires groove
Control ✔ Excellent (Metal Stop) Groove dependent
Pressure ✔ High (Anti-extrusion) Medium - High
6. Are they reusable?

Generally single-use for critical applications due to potential compression set and weakened bonding.

7. Customization Options?

Yes! We offer custom sizing (Metric/BSP), geometries, specialty compounds, and self-centering designs.

8. Compliance Standards

Full compliance with DIN, ISO, SAE dimensional standards, as well as RoHS & REACH environmental regulations.

منتجات ذات صله / Best Ring Industrial Corporation

العنوان O
العنوان O
غسالة مطاطية (Ghasala Matatiyah)
غسالة مطاطية (Ghasala Matatiyah)
حشية (Hashiya)
حشية (Hashiya)
شريط مطاطي
شريط مطاطي
حلقات الحماية المطاطية (Rubber Grommet)
حلقات الحماية المطاطية (Rubber Grommet)
حلقات X (Quad-Rings)
حلقات X (Quad-Rings)
حلقة الدعم
حلقة الدعم
حلقة V
حلقة V
حلقة D
حلقة D
أختام U-Cups
أختام U-Cups

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