Linde Polymer Tec Co.,Ltd. is one of the most experienced manufacturers and suppliers of bonded seal for fitting bolt head in China, also supports customized service. Please feel free to buy high quality bonded seal for fitting bolt head for sale here from our factory.
Products Description

A bonded seal for fitting bolt head, that is, a bonded seal for bolt head, is a gasket used to provide a seal around the bolt head. It usually consists of a metal washer and an elastomeric ring bonded to the inside of the diameter.
advantages
- Reliable low and high-pressure seals: Able to provide reliable seals at different pressures.
- Excellent high and low-temperature performance: Suitable for a wide temperature range.
- Reduced bolt torque: Reduces bolt torque without reducing the tightening load.
- Self-positioning feature: Some designs come with additional rubber flaps to center the gasket in the hole, these are called self-positioning glue-in gaskets.
Material and size specifications
Rubber Material
NBR: good oil resistance, suitable for media such as mineral oil, vegetable oil, and fatty hydrocarbon oil, the operating temperature range is generally -30℃~100℃.
FKM: excellent high-temperature resistance and chemical corrosion resistance, can be used in the temperature range of -15℃~200℃, suitable for sealing harsh media such as strong acid, strong alkali, and organic solvents.
EPDM: good weather resistance and ozone resistance, suitable for water, steam, air, and other media, with a wide temperature range.
HNBR: excellent comprehensive performance, with good oil resistance, heat resistance, wear resistance, and ozone resistance, suitable for some sealing occasions with higher requirements.
| Example: HNBR 90 | ||||
| Property | Unit | Test Method | Test Parameter | Value |
| Hardness | Shore A | ASTM D 2240 | 90±5 | |
| Specific Gravity | g/cm3 | ASTM D 297 | 1.29 | |
| Tensile Strength | MPa | ASTM D 412 | 26.1 | |
| Modulus at 100% | MPa | ASTM D 412 | 19.2 | |
| Ultimate Elongation | % | ASTM D 412 | 145 | |
| Tear Resistance | N/mm | ISO 34-1 | 9.2 | |
| Compression Set | % | ASTM D 395 B/1 | 168h / 100°C | 19 |
| Compression Set | % | ASTM D 395 B/1 | 24h / 150°C | 11 |
| Compression Set | % | ASTM D 395 B/1 | 70h / 125°C | 18.6 |
| Compression Set | % | ASTM D 395 B/1 | 70h / 150°C | 30 |
| Low temp. TR10 | °C | ISO 2921 | TR10 | -17 |
| Low temp. DSC glass transition | °C | DSC glass trans | -21 | |
| Low temp. brittle point | °C | ASTM D 2137 A | brittle point | -35 |
Dimensions
Standard sizes: Available in Metric, Imperial, BSP, and other sizes.
Custom sizes: Custom sizes and material combinations can be customized to meet specific application requirements.
| Size (BSP) | Inside Diameter (ID) | Outside Diameter (OD) | Metal Thickness |
| 1/8" | 10.37 mm | 15.88 mm | 2.00 mm |
| 1/4" | 13.74 mm | 20.57 mm | 2.00 mm |
| 1/2" | 21.54 mm | 28.58 mm | 2.50 mm |
| 1" | 33.89 mm | 42.80 mm | 3.20 mm |
| M10 | 10.50 mm | 16.00 mm | 2.00 mm |
| M20 | 20.50 mm | 28.00 mm | 2.00 mm |
Applications Of Bonded Seal For Fitting Bolt Head
1. Hydraulic system: widely used for bolt sealing in hydraulic equipment.
2. Pipeline connection: used to seal hydraulic joints, pipe joints, or bolt heads.
3. Mechanical and pneumatic systems: suitable for high-pressure applications in various mechanical and pneumatic systems.
about Us
Linde Polymer Tec Co., Ltd. mainly produces a variety of rubber compounds and rubber seals and currently has more than 3,000 material formulas and more than 2,000 product specifications. Products are suitable for automotive, aviation, machinery, petrochemical, medical, food, electronics, military, industrial, and other fields. Since the establishment of the factory, the company has completed the process consistency operation, and the product yield rate has reached 97.1%.

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