Assembly

In addition to Norris Precisions manufacturing capabilities, we offer a full range of value added assembly options. From installing Helicoils, Slimserts, Keenserts, Lee Plugs, Lee Restrictors and Rosan Fittings to a variety of studs, pins and bushings, we can supply your lower level components to you machined and assembled complete. Norris Precision can also provide upper level assemblies incorporating those components to reduce part counts and overhead costs related to the procurement and assembly of individual components.

The Lee Plug is a cylindrical plug with a tapered hole part way through its center and numerous small grooves on its outside diameter. It is slipped into a reamed counter bore in the product. A tapered pin is then driven into the plug until the ends of the pin and the plug are flush with each other. Controlled expansion causes the lands and grooves of the plug to "bite" into the surrounding material forming independent seals and retaining rings. Result: a positive, reliable, leak and trouble-proof seal for both liquids and gases.

Keensert Key-Locking Inserts provide high strength and reliability and are designed to provide high resistance to rotation and pull-out loads. After installation into the tapped hole, the locking keys on each Keensert are driven down through the threads of the parent material, locking the insert firmly and permanently in place.

Lee Restrictors are miniature inserts available in metered Lohm rates from 1000-10,000 Lohms, and are screened to protect the orifice. Flow through the orifice creates pressure drop across the ball which moves it completely away from the seat. This unique design eliminates silting problems which occur whenever a restrictor is used in series with a check valve. Lee Restrictor Cheks maintain large minimum passageways for reliable performance.

Ring Locked (Rosan) Fittings Fluid boss adapters are lightweight and provide a fluid passage from tube ends to parent material boss. They are available in Beam, Flared and Flareless seal configurations. Each fitting has two sealing surfaces, an anti-rotation captive lock ring that secures the adapter to the boss, and prevents loosening or backing-off under severe vibration, temperature cycling or B-nut installation and removal. Slimsert® Inserts are one piece, thin walled locked-in threaded inserts that provide high strength bolted joints in weaker materials.

Slimsert® inserts are a logical choice when space limitations result in minimum boss dimensions, but you require a maximum degree of thread protection and fastening integrity. Free running and thread locking internal threads are available. Slimsert® inserts are manufactured in strict conformance to MIL-I-45932/1C and MIL-I-45932/3B. Slimsert® inserts are easy to install. No special taps or gages are required for parent hole preparation. Swaging the knurl securely locks the insert in place providing high resistance to torque-out.

Heli-Coil When installed into Heli-Coil STI tapped holes, inserts provide permanent conventional 60° internal screw threads that accommodate any standard bolt or screw. Heli-Coil threaded inserts boast a high wearing tensile strength, low thread friction with tight tolerances, and a high surface quality as well as corrosive- and heat-resistant properties. With Heli-Coil threads, tapped holes are strengthened and thread life is dramatically increased even after repeated assembly and disassembly. Tapped holes are easily incorporated into existing designs.