Tanged CoilThread® Inserts
Tanged 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 finished surface (8-16 micro-inches) is
exceedingly smooth, virtually eliminating friction-induced thread erosion.
The stainless steel used resists corrosion under normal environmental conditions. Galvanic action within
the thread assembly is reduced, further adding to the life of the fastening assembly. KATO Inserts are used
with temperatures from -320°F to +800°F (-195.6°C to +426.7°C).
Why tanged inserts from KATO?
Lower pricing than competitive inserts.
Complete range of locking and free-running sizes, bulk or strip-feed, including metric.
Full line of taps, gages, and tools available.. interchangeable with and
will install all major brands of inserts.
Meet or exceed all applicable military, aerospace, and commercial standards. Full Traceability.
Design and Application Assistance: over 30 years of manufacturing and engineering experience.
Try the new Product Wizard or view a list of
part numbers at the links below.
Precision engineering, exacting manufacturing standards, and stringent quality control procedures assure
a high quality product that meets or exceeds all applicable military and aerospace standards.
Tanged inserts install into the BS4377 tapped holes to accept ISO metric threads conforming to Tanged Inserts
BS364: Part 1: 1981 and BS364: Part 2: 1981. Metric Tanged CoilThread inserts conform to National Bureau of
Standards Handbook H-28/21, M Profile, Tolerance Classes 4H5H or 5H, as well as ISO standards 68, 261, R724 and 965/I.
The resilient characteristics of each coil in a CoilThread Insert allows it to adjust independently to secure
the maximum surface contact with individual threads in the parent material. As a result, loads are distributed more evenly.
Stress and fatigue concentrations are reduced to maximize thread strength and increase the reliability and life of the
CoilThread Inserts provide design and manufacturing flexibility. Design opportunities are afforded by the structure
of these inserts. Because of the continuous helically-coiled design, they need no thick wall structure to support the
internal and external threads; the diamond-shaped coil is the thread!
The inserts can be installed in reduced-sized bosses or flanges and within constricted areas, thus saving space and
weight while providing high strength. A boss radius equal to the nominal bolt diameter is usually sufficient.
Kato CoilThread Inserts are precision-engineered and have been put through rigorous torque, tension, and vibration
tests as well as comprehensive dimensional inspections and metallurgical analysis in attaining their MIL-Spec qualifications.
CoilThread Inserts have been thoroughly tested by an independent testing laboratory and are certified to conform to NASM8846.