Products & Services

Our all new 0-80 inserts are now available and they could well be the smallest in the world!

The new 0-80 unified fine pitch inserts are currently available in free-running 1,1.5 and 2 diameter nominal lengths.

These new inserts will provide the same security as the myriad of applications the larger versions have been successful for in the past. For any enquiries contact us on: 

CoilThread® Tanged Inserts

We manufacture all CoilThread® inserts here at Advanex Europe. We also have a global distribution network. (See distributors)

We have pioneered this technology and are incredibly proud of its success. We also have huge plans for its growth in the future..

Our Approach

Our high quality range of Tanged Inserts is not only produced from the best quality material and at a competitive price but to further support this market leading product we offer:

A Standard Range - The complete range of standard inserts is available in Free Running form in both Metric and Unified sizes, ranging from M2.5 to M12 in Metric, and 2-56 to ½-13 in Unified. All sizes can be supplied in 1D,1.5D and 2D lengths. Longer 2.5D & 3D lengths available upon request.

We also produce special inserts from high temperature materials such as Inconel X750 , and offer an anti-galling product manufactured from material with properties comparable with Nitronic 60.

Additionally we can supply cadmium, silver or dry film lube plating to suit your application. Other plating options available upon request.

Locking Range - For applications in which cyclic vibration or impact can be a concern the entire range can be produced in a Locking form to provide a reliable thread and confidence.

Materials- The standard range is manufactured from diamond shaped cold-rolled Type 304 Stainless Steel wire (AS7245), which is finished to provide a surface which is exceedingly smooth, virtually eliminating friction-induced thread erosion.

Packaging- for more automated or high volume applications they can be supplied on a plastic strip in reel form which we call Strip Feed. The inserts are held securely in the reels of plastic tape and neatly coiled into reels.

Tooling - A full range of gauges, installation and removal tools have been designed and tested to further support the Tanged range and depending on your application and budget can be supplied as Hand Tools, Air Tools and Electric Tools.

Quality - With over 25 years of manufacturing and engineering experience the Tanged range of inserts meet or exceed all applicable military, aerospace, and commercial standards and we provide full traceability for our customer peace of mind.




Technical Overview

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 1400MPa, and a hardness of Rc 43-50. The finished surface (32 microinches) is exceedingly smooth, virtually eliminating friction-induced thread erosion.

Tangless® and tanged CoilThread® inserts are available in Unified Coarse (UNC), Unified Fine (UNF), and Metric thread sizes as well as bespoke sizes. CoilThread® inserts can be manufactured using 304 Stainless Steel as well as Nitronic 60®, Nimonic 90®, Phosphor Bronze, Inconnel X750 and more.

Why use CoilThread® Inserts?

Tangless® and Tanged CoilThread® inserts provide design and manufacturing flexibility.

CoilThread® inserts 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. Thus, they do not need a thick wall structure to support the internal and external threads. 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. Stress and fatigue concentrations are reduced to maximise thread strength, thus, increasing the reliability and life of the fastening system as well as being simple to use.

CoilThread® inserts are designed to be installed in reduced-sized bosses or flanges, thus saving space and weight while providing high strength. A boss radius equal to the nominal bolt diameter is usually sufficient.




Precision engineering, exacting manufacturing standards, and stringent quality control procedures are utilised during entire manufacturing process to ensure a high quality product that meets or exceeds all applicable military and aerospace requirements. CoilThread® inserts 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 and are certified to conform to NASM8846.

When installed into STI tapped holes (per NASM33537 for unified and MA1567 for metric), CoilThread® inserts provide a finish thread. Assembled CoilThread® inserts will also accommodated UNJ (MIL-S-7742 and AS8879) male threaded fasteners. 

The image above depicts weight and space savings provided by utilising CoilThread® inserts. All three samples have the same internal thread, and as you can see CoilThread® inserts require the smallest boss diameter.

Tangless® vs Tanged CoilThread® Inserts

Tangless® CoilThread® inserts are identical, in form, fit, and function to the conventional tanged inserts. In fact, Tangless® CoilThread® inserts are identical to tanged inserts in every way except for their method of installation and removal, and they have the exact same procurement specification (NASM8846 for unified sizes and MA1565 for metric sizes).


Insert Materials

304 Stainless Steel (Standard)
This is the most pop ... MORE ular insert material, and it will satisfy most application requirements for strength, corrosion resistance and temperature capability. The inserts can be used in applications with a temperature range from -320° F to 800° F. Cold rolling the stainless steel wire to a diamond shape work-hardens it to a tensile strength above 200,000 PSI, a hardness of Rc 43-50 and a smooth 8-16 micro-inch finish. The inserts become slightly magnetic from the work-hardening that occurs during the manufacturing process (approx. 2-10 G/O). The insert material is covered by specifications AS7245, NASM8846 and alloy number UNS S30400.
Inconel X-750
Inserts are supplied ... MORE in this material for higher temperature capability and reliability applications. Inconel X-750 inserts have approximately the same strength and hardness characteristics of 304 stainless steel inserts, but can be used in environments up to 1,000° F. The material is a nickel-chromium alloy, made precipitation hardenable by the additions of aluminum and titanium. It has good rupture resistance at higher temperatures, good corrosion and oxidation resistance and a lower magnetic permeability than 304 stainless steel inserts (< 1.0 G/O). Typical applications include gas turbines, rocket engines, nuclear reactors, pressure vessels, and various aircraft components operating in higher temperature environments. The insert material is covered by specification AS7246.
Phosphor Bronze
Inserts made from th ... MORE is material are ideal for salt water applications and have superior corrosion resistance over 304 Stainless Steel and Inconel X-750, although it is not as strong as either material. It has a tensile strength of approximately 140,000 PSI and a hardness of HRB 95. Phosphor Bronze inserts are also used in applications requiring very low magnetic permeability (< 1.0 G/O), low electrical connectivity and conductivity, and they can be used in environments up to 572℉. Typical applications Include Naval vessels, aircraft instrumentation paper and textile manufacturing, automotive systems, mining and drilling equipment, pumps and valves, and electrical connectors. The insert material is covered by specification AMS7247.
Nitronic 60®
Inserts made from Ni ... MORE tronic 60 are specifically engineered to eliminate galling and fretting when used with stainless steel screws. The surface friction between the mating screw and the Nitronic 60 insert is superior to 304 Stainless Steel inserts due to the additions of silicon and manganese to the alloy which reduces wear and galling, thus particulate matter is eliminated completely or minimized. The inserts require no additional coatings or platings, making them ideal for use in a vacuum as there is no out gassing, and they are not limited by the lower temperature capabilities of some platings and coatings, e.g. cadmium and dry film lubricant. The inserts are non-magnetic (< 1.0 G/O), have good corrosion resistance, a tensile strength of approximately 200,000 PSI, a hardness of Rc 43-50 and can be used in temperatures up to 500° F. Typical applications include semiconductor, aerospace industries, or when requirements indicate the use of 300 series Stainless Steel male fasteners. The material is metal alloy number UNS S21800.
Nimonic 90®
Inserts made from Ni ... MORE monic 90 are used in high temperature environments where pressure and heat are extreme. It is a nickel-chromium-cobalt alloy that is precipitation hardenable and having high stress-rupture strength at elevated temperatures. Nimonic 90 is an ideal material for applications in aircraft parts and gas turbine components, such as jet engine exhaust nozzles. Typically free running inserts are used in environments with temperatures up to 1200° F and locking inserts up to 900° F. The chemical composition of Nimonic 90 is Ni 54%, Cr 18-21%, Co 15-21%, Ti 2-3%, and Al 1-2%. The material is covered by British Standard BS HR 503.
Inserts made from Ti ... MORE tanium have a superior strength to weight ratio over 304 Stainless Steel inserts. They also provide very good corrosion resistance and are non-magnetic. Titanium inserts are slightly lower in tensile strength (150,000 to 220,000 PSI) and hardness (Rc 35-43), but are approximately 45% lighter in weight than 304 Stainless Steel inserts, making them ideal where weight reduction is critical. Titanium is very stable and its low coefficient of thermal expansion makes it an excellent choice for use in aerospace applications, such as satellites that must survive temperature fluctuations from sub-zero to 600° F (maximum temperature for insert applications). Titanium is used in biomedical applications; as it is compatible with the human body it is used extensively for applications that involve biological implants. Titanium inserts are covered by material specifications AMS 4957 and AMS 4958A.
Please Note:
Nitronic 60® is a registered trademark of AK Steel.
Nimonic 90® is a registered trademark of Special Metals Corporation.

Insert Platings and Coatings

Dry Film Lubricant
The most versatile, ... MORE and most popular, coating applied to KATO® Tangless® and tanged CoilThread® inserts is the Dry Film Lubricant. The Dry Film Lubricant is applied to limit galling between the insert and the fastener. The Dry Film Lubricant is a Molybdenum Disulfide applied in accordance with AS5272 (Type 1). On Locking or Free-Running inserts, the coating will be Dark Gray to Black in color (NASM8846).
In addition, Molybdenum Disulfide has inherent corrosive inhibiting qualities: Galvanic Corrosion Resistance – Independent testing indicates Molybdenum Disulfide may be suitable for certain applications requiring resistance from galvanic corrosion.
The suffix “W” is added to KATO part numbers (ex. 2TLC-02C-0086W) to signify the application of Dry Film Lubricant.
Cadmium plating KATO ... MORE ® Tangless® and tanged CoilThread® inserts significantly increases corrosion protection. Cadmium plating is primarily used to protect against corrosion, but like Molybdenum Disulfide, helps decrease the coefficient of friction between the insert and the bolt to minimize galling.
Cadmium is applied in accordance with AMS-QQ-P-416. The identification colors vary depending on the type of inserts (locking vs. free-running). A supplemental Olive Drab to Dark Brown chromate is required to identify Locking Inserts. Gold to Yellow chromate is required to identify Free-Running Inserts (NASM8846).
Cadmium plating is meant to show no evidence of corrosion when exposed to a continuous salt spray test (96 hour ASTM B 117 test in accordance with NASM1312-1).
Silver-plating KATO ... MORE Tangless® and tanged CoilThread® inserts increases lubricity at higher temperatures. Silver plating is applied in accordance with customer requested AMS specifications. Commonly, AMS2410, AMS2411, or AMS2412. For additional specifications please contact the KATO Tech-Group. Cloudy White is the standard color.
Electroless Nickel
Electroless Nickel p ... MORE lating on KATO® Tangless® and tanged CoilThread® inserts provides wear resistance and corrosion protection. Electroless Nickel is applied in accordance with AMS-C-26074, unless otherwise specified by the customer. Polished Silver is the standard finish.
Although passivation ... MORE is not actually a plating/coating, this supplemental treatment is sometimes required by the application. KATO® passivates inserts in accordance with AMS2700.
KATO does not make it standard practice to passivate active stainless steel CoilThread inserts. This minimizes the possibility of galvanic corrosion occurring when they are installed in aluminum or magnesium parent materials.
Blue and Green Inserts
Color Identifier Gre ... MORE en – Add a “G” suffix to KATO part numbers (ex. 2TLC-02C-0086G) to signify green dye. The green dye is standard printers ink and may be removed with a cleaning solution.
Color Identifier Blue – Add a “B” suffix to KATO part numbers (ex. 2TLC-02C-0086B) to signify blue dye. The blue dye is standard printers ink and may be removed with a cleaning solution.sivation requirement.
Please Note:
All non-plated KATO ... MORE Locking Tangless® and tanged CoilThread® inserts are dyed red for identification in accordance with NAS1130, NA0276, and NASM21209. The red dye is standard printers ink and may be removed with a cleaning solution.
Dry Film Lubricant and the Cadmium plating are called out in NAS1130, NASM122076, NASM124651, NASM21209, NA0276, MA3280, MA2181, MA3330, and MA3331. Any other coatings or platings will deviate from these specifications.
If you have any questions, contact the KATO Tech-Group.

Part Numbers

Type Style Thread Size (Internal Thread) Pitch Material Installed Length

2T= Tangless®

N= Free Running M= Metric Eg: 2.5 Eg: X0.45 C= Stainless Steel Eg: -6.3 = 2.5D
T= Tanged L= Locking C= Coarse Unified     N= Anti Gall Material  
    F= Fine Unified     T= X750   
          P= Phosphor Bronze  

*SF can be added onto the end of Part Numbers to indicate that the inserts need to be delivered on Strip Feed.

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