OSI-Bolt®

Traditionally, blind fasteners have been used in secondary airframe structure where joint loads are less severe than in primary structure. Solid shank fasteners are normally used in these highly stressed areas because of their ability to carry high shear and tensile loads.

The OSI-Bolt® is a unique new fastening system specifically designed as a direct replacement for solid shank pin-and-collar systems; its shear, tensile, and preload properties meet or exceed that of its pin-and-collar counterparts. Moreover, unlike two-piece fastening systems, where two operators are required to work together on opposing sides of a structure to complete an installation, the entire OSI-Bolt® installation is facilitated from one side of the structure, eliminating the need for a second operator.

Other OSI-Bolt® design features include its demonstrated ability to be installed in high interference fit conditions (.006” in aluminum and .003” in steel) without losing sheet take-up and preload capabilities. Its large blind-side footprint coupled with the industry’s highest preload make the OSI-Bolt® suitable for both composite and metallic airframes. The OSI-Bolt® is available in fractional diameters 5/32” through 1/2” and standard (1/64” & 1/32”) repair oversizes in Titanium, A286 CRES and Inconel-718 materials to satisfy 95 KSI and 112 KSI shear strength requirements.

The OSI-Bolt® is directly interchangeable with standard and oversize pin-and-collar systems, can be installed with standard NAS1675 type tooling and, because the OSI-Bolt® always breaks flush, there is no secondary shaving required. OSI series fasteners are tested to NAS1675 vibration endurance requirements and are highly resistant to vibration. Providing a full 1/16” (.0625) grip accommodation with +/- .015” capability, the OSI-Bolt® is also 7° backside slope and interference fit capable and is internally self-sealing to 100 PSI air.

A-286 Stainless
A-286 stainless steel is an age-hardenable, iron-nickel-chromium superalloy. It’s appropriate for applications that demand oxidation resistance and corrosion resistance in combination with high tensile strength. A-286 has high strength and corrosion resistance for temperatures up to 1300°F (704°C) and oxidation resistance up to 1800°F (982°C). Additionally, A-286 alloy is an austenitic stainless steel, making it ideal for fastener applications, manifold components in the oil and gas industry, as well as superchargers, jet engines, and turbine components.

Inconel 718
A nickel-based superalloy, Inconel 718 is well-suited for applications requiring high strength in a wide range of temperatures, from subzero up to 1400°F. Inconel 718 also displays excellent tensile and impact strength.

Titanium
Titanium can deliver an incredibly high strength-to-weight ratio, which can result in up to 40% weight savings when compared to fasteners made with traditional alloys.