Next: Countersunk Seal Screws with Under Head Seal 
Prev: Pan Head Seal Screws with Under Head Seal 
Raised Countersunk Seal Screws with Under Head Seal are typically used in place of traditional gaskets – designed with a highly durable seal to prevent the leakage of fluids and gases when under pressure.
The green seal is permanently fused to the bearing surface of the head which compresses when fastened. This fills the gap between the underside of the head and counter sink for a secure gasket-type seal.
These components offer high reusability as the under head element does not shrink or dry out. In addition to providing excellent resistance to a wide range of chemicals and automotive fluids – including alcohol, gasoline, kerosene, oil, diesel fuel and hydraulic fluids – they also prevent galvanic corrosion between dissimilar materials.
Raised Countersunk Head Seal Screws with Under Head Seal are a cost-effective sealing solution that can be supplied with a much shorter lead time compared to standard o-ring seal screws.
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- Cross Recess Raised Countersunk Under Head Seals Screws typically conform to DIN 966 Type H standard / DIN 966 Type Z standard / ISO 7047 / ASME B18.6.3
- Slotted Raised Countersunk Under Head Seal Screws typically conform to DIN 964 standard / ISO 2010 / ASME B18.6.3
- 6 Lobe Torx (TX) Raised Countersunk Under Head Seal Screws typically conform to DIN 966 standard / ISO 14584
The seal can be applied to all of our standard materials, including Steel and Stainless Steel, with non-standard materials and finishes available on request. Special seal colours can also be supplied.
Non-standard sizes, materials and finishes are available to order as specials, including small volume manufacture, modifications and bespoke parts made to drawings. Minimum order quantities apply.
Flat Countersunk Under Head Seal Screws are also available at Fastenright, as well as a wide range of Sealing Fasteners.
| M2 to M10 Technical Data & Availability | |||||||||||||||
| Thread Diameter (d) |
M2 | M2.5 | M3 | M4 | M5 | M6 | M8 | M10 | |||||||
| dk max. (mm) | 3.8 | 4.7 | 5.6 | 7.5 | 9.2 | 11 | 14.5 | 18 | |||||||
| k max. (mm) | 1.2 | 1.5 | 1.65 | 2.2 | 2.5 | 3 | 4 | 5 | |||||||
| Available Lengths (L) |
M2 | M2.5 | M3 | M4 | M5 | M6 | M8 | M10 | |||||||
| 3mm |   |
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| 4mm | |
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| 5mm | |
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| 6mm | |
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| 8mm | |
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| 10mm | |
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| 12mm | |
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| 14mm | |
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| 16mm | |
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| 18mm | |
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| 20mm | |
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| 22mm | |
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| 25mm | |
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| 28mm | |
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| 30mm | |
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| 35mm | |
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| 40mm | |
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| 45mm | |
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| 50mm | |
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| 55mm | |
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| 60mm | |
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| 65mm | |
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| 70mm | |
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| 75mm | |
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| 80mm | |
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| 85mm | |
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| 90mm | |
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| 95mm | |
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| 100mm | |
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| = A2 / 304 Stainless Steel // = A4 / 316 Stainless Steel Dimensions shown are for DIN 966 only. Size not listed? Please contact us – we may be able to provide it. |
| 3/16″ | |
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| 1/4″ | |
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| 5/16″ | |
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| 3/8″ | |
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| 7/16″ | |
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| 1/2″ | |
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| 5/8″ | |
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| 3/4″ | |
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| 7/8″ | |
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| 1″ | |
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| 1 1/4″ | |
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| 1 1/2″ | |
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| 1 3/4″ | |
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| 2″ | |
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| 2 1/4″ | |||||||||
| 2 1/2″ | |
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| 2 3/4″ | |||||||||
| 3″ | |
| = A2 / 304 Stainless Steel // = A4 / 316 Stainless Steel Size not listed? Please contact us – we may be able to provide it. |
