EuroWire September 2020

Products

▲ (From left) Thin wall insert, CoilThread insert and solid insert. All three samples have the same internal thread, but CoilThread inserts require the smallest boss diameter

Tangless and tanged CoilThread inserts

have been thoroughly tested by an independent testing laboratory and are certi ed to conform to NASM8846. When installed into STI tapped holes (per NASM33537 for uni ed and MA1567 for metric), CoilThread inserts provide a nish thread meeting the requirement of FED-STD-H28. Assembled CoilThread inserts will also accommodate UNJ (MIL-S-7742 and AS8879) male threaded fasteners. The tangless CoilThread inserts are identical, in form, t and function, to the conventional tanged inserts (CoilThread, Helicoil and Recoil). The only way they di er is in their method of installation and removal. Kato CoilThread inserts are used in aircraft applications such as engines, gearboxes, fuel systems, radar, avionics, ight controls, lighting and HVAC systems. They are also used by the military and in other electronic, mechanical and commercial applications. The tangless, FOD-free design is the preferred standard for optimum thread assemblies in new fastening system designs. Kato Fastening Systems, Inc www.katofastening.com

For the same nominal thread size, the parent material thickness requirement is less when compared with thin wall or solid inserts. The resilient design characteristics of CoilThread inserts allow each coil to adjust independently for maximum surface contact with the parent material. As a result, loads are distributed more evenly, and stress and fatigue concentrations are reduced to maximise thread strength, increasing the reliability and life of the fastening system. CoilThread inserts are designed to be installed in reduced-sized bosses or anges, saving space and weight while providing high strength. A boss radius equal to the nominal bolt diameter is usually su cient. and stringent quality control procedures during the manufacturing process ensure quality that meets or exceeds applicable military and aerospace requirements. Kato CoilThread inserts have undergone rigorous torque, tension and vibration tests as well as comprehensive dimensional inspections and metallurgical analysis in attaining their mil-spec quali cations. The inserts Precision engineering, exacting manufacturing standards

Kato tangless and tanged CoilThread inserts are helically coiled fastening devices that provide permanent, wear-resistant threads, exceeding the strength of most parent materials. CoilThread inserts are made of cold-rolled 304 stainless steel wire (AS7245), work-hardened to a tensile strength above 200,000 psi and a hardness of Rc 43-50. The nished surface (32 microinches) is very smooth, virtually eliminating friction-induced thread erosion. Tangless and tanged CoilThread inserts are available in Uni ed Coarse (UNC), Uni ed Fine (UNF) and metric thread sizes. In addition to 304 stainless steel, the inserts can be manufactured using Nitronic 60®, Nimonic 90®, phosphor bronze and other materials. The tangless and tanged CoilThread inserts provide design and manufacturing exibility, and are based on a continuous helically coiled open pitch design using a diamond-shaped wire. The diamond-shaped wire design allows the inserts to engage the threads in the parent material and at the same time accept a male fastener, so they do not need a thick wall structure to support the internal and external threads.

Graphics bigstockphoto.com/Artistnd 3000

EF 5/53

www.read-eurofasteners.com

September 2020