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Self-sealing fasteners have an elastomeric insert or captive o-ring that provides simultaneous locking and sealing. They offer positive sealing under vacuum pressures and are often reusable, providing high-integrity seals even after many applications. There are two basic types of products: threaded fasteners and rivets. Both types of devices are made of aluminum, alloy steel, brass, bronze, carbon steel, molybdenum, stainless steel, plastic, or polytetrafluoroethylene (PTFE). Products made from proprietary materials such as Hastelloy® and Inconel®, registered trademarks of Haynes International, Inc., are also available. Many self-sealing fasteners are treated with coatings or finishes that enhance corrosion resistance or provide other desirable characteristics. For example, aluminum fasteners are often anodized or finished with chrome. Copper fasteners are plated with silver or zinc. Black oxide, bright nickel, dull nickel, cadmium plating, chromium plating, and zinc plating are other common surface treatments. Passivation, the process of removing iron compounds from the surface of stainless steel, is used to form a thin, protective oxide layer that resists corrosion.

There are three types of threaded, self-sealing fasteners: screws, nuts, and bolts. Products differ in terms of head style, drive type, English size, and metric size. Self-sealing fasteners with hexagonal heads have six flat, vertical sides. Fillister heads are similar to machine screw pan heads, but do not have rounded top corners. Flat heads lay flush with the surface of the fastened material. Products with socket cap, oversized, and tamper-proof heads are also available. There are four basic drive styles for threaded, self-sealing fasteners: slotted, Phillips, Allen, and six-lobe. Screws with English sizes are numbered or measured in fractions of an inch. Numbered screw sizes include 2, 3, 4, 5, 6, 8, 10, and 12. Fractional screw sizes include 1/4 in, 5/16 in, 3/8 in, 7/16 in, 1/2 in, 9/16 in, 5/8 in, 3/4 in, and 7/8 in. Metric sizes for nuts and screws include M2, M2.5, M3, M3.5, M4, M5, M6, M8, M10, M12, M14, M16, M18, M20, M22, M24, M27, and M30. 


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Engineering Web: Self-sealing Fasteners
Pages: 1 - 5 of 11216
Self-Sealing Fasteners
Self-Sealing Fasteners Nyseal, a preapplied, self-sealing coating, creates a gasketlike seal on fasteners at pressures to 500 psi. The coating covers 360° of the fastener head's bearing surface and ...
Self-Sealing Screws, Nuts, Bolts, Washers and Fasteners | FAQ APM Hexseal Self-...
A special silicone formulation is used that is resistant to salt water weather, dirt, dust, sunlight, ozone and most acids, prolonging frequency and life of these special self-sealing fasteners. They ...
See APM Hexseal Corp. Profile & Catalog
ZaGO Self-Sealing Fasteners
USE ZAGO SELF-SEALING SCREWS. NO LEAKS!. NO WONDER. MORE AND MORE. PEOPLE ARE CHOOSING. ZAGO SELF-SEALING. FASTENERS. ...... THE FEATURES:. ZaGO'S. SELF-SEALING FASTENERS ARE: AIRTIGHT. PROVIDING A ...
See ZaGO Manufacturing Company, Inc. Information
Machine Design -
Self-Sealing Fasteners Fasteners also prevent gases and liquids from leaking. When large areas or mating surfaces must be sealed, a gasket or caulking compound is used. In this case, the fastener ...
Self-Sealing Fasteners - Design Shortlist of UK manufacturing and engineering ...
... Fasteners, Self-Sealing Fasteners - Design Shortlist of suppliers and products ...
See more product announcements for Self-sealing Fasteners
Reusable, High-Pressure Self-Sealing Fasteners

Reusable, High-Pressure Self-Sealing Fasteners
APM Hexseal Corp.


Self-Tapping, Self-Sealing Fasteners

Self-Tapping, Self-Sealing Fasteners
APM Hexseal Corp.


Self-Sealing Fasteners for Sheet Metal Assembly

Self-Sealing Fasteners for Sheet Metal Assembly
APM Hexseal Corp.


11 See more product announcements for Self-sealing Fasteners

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