HELICOIL® Plus Imperial thread inserts
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Thread technology for high-strength fastenings – imperial threads UNC, UNF, BSW, BSF, BSP/G, BA

The HELICOIL® system System modules – the fastener A close look at the advantages Modular system Design guidelines Technical data and item numbers System modules – the tool All taps at a glance Thread tolerances for imperial threads Manual taps Machine taps Internal thread gauges Installation Installation mandrels Installation tools Battery installation tools Electrical installation tools Pneumatic installation tools Mechanical installation tools Automatic installation Manual installation tools Tang break-off and extraction tools Large picture (left): Application example

HELICOIL® thread inserts Can you imagine a world without screws? Even today, the screw is the most widely used fastening element for detachable joints. Optimised tightening methods and high-strength screws allow constant improvement. Considerably higher forces can be transmitted so that the dimension or total number of required screws can be reduced. However, only highly sustainable nut threads permit high-strength screw joints. This is where our HELICOIL® thread technology is used. Your advantages – an overview: n High thread loading n Increased quality and value n Wear-resistant, low and...

HELICOIL® thread inserts Structural component – thread reinforcement and repair HELICOIL® is thread reinforcement and repair. Threads are reinforced whenever low-strength materials (e.g. aluminium, aluminium-magnesium alloys and fibrereinforced plastics) are used. The nut thread is wear-resistant even in cases of frequent use. HELICOIL® allows miniaturisation and lightweight construction for the development of production parts. The HELICOIL® thread insert has been tried and tested for more than 60 years and has become a widely used structural component. Worldwide, HELICOIL® thread inserts...

HELICOIL® thread technology HELICOIL® Plus Free Running* Every thread of the thread insert with precision-formed, rhombic profile is free running. The result is an internal thread true to gauge that can be used from both ends. The dimensional stability of the thread formed by HELICOIL® Plus meets the demands on international standard specifications. The advantages of the HELICOIL® Plus system are particularly apparent with respect to processing and tools and result in shorter cycle times. HELICOIL® Plus Screwlock* This thread insert has an additional screw-locking area. One or several...

HELICOIL® Tangfree Free Running* You do not need a tang to install these thread inserts. Therefore, tang break and removal are not required. Combined with the matching installation tools, the current innovation status in the HELICOIL® technology is a perfect addition to the HELICOIL® product family. Simply order the separate catalogue No 0150. HELICOIL® Tangfree Screwlock* HELICOIL® Tangfree Screwlock has the same advantages as HELICOIL® Tangfree. In addition, there is a screw-locking area. The screw is locked by one or several polygonal-shaped threads clamping the flanks of the screwed in...

HELICOIL® thread inserts – a close look at the advantages Wear resistance HELICOIL® Plus thread inserts are made of austenitic chrome-nickel steel (minimum tensile strength 1,400 N/mm²). The high surface quality of the rolled thread ensures a high-strength, wear-resistant thread with an extremely small and constant thread friction torque. Therefore, a higher, constant preload-force is achieved for repeated cycles at the same tightening torque. The utilisation of the yield point of high-strength screws is improved. Torsion stress is considerably reduced. Compared to tapped threads, the...

Tight fit When not installed, the outside diameter of the HELICOIL® Plus exceeds the receiving thread by a defined amount. In combination with the high spring force of the material, this difference in dimension results in radial expansion and therefore in the tight and clearance-free fit in the nut thread. Additional locking elements or adhesive – as are common for fixed bushes — are therefore obsolete. If you use impact wrenches, please contact us. We will be happy to help you. Screw locking Thread technology and the polygonal-shaped thread of the HELICOIL® Plus Screwlock lead to a high...

HELICOIL® modular system Metric coarse thread DIN ISO 13 1 Metric fine thread DIN ISO 13 (T02–T11) HELICOIL® Plus Free Running Stainless steel A2 material No 1.4301 Thread types The HELICOIL® has been tried and tested for more than 60 years and has become a renowned structural component. There is a solution to almost every task related to this thread technology. Stainless steel A4 material No 1.4571 HELICOIL® Plus Screwlock HELICOIL® Tangfree HELICOIL® Tangfree The tangfree coil thread insert for a high-strength thread Catalogue No 0150 The tangfree coil thread insert for a high-strength...

Cadmium plated HELICOIL® Classic Free Running HELICOIL® Classic Screwlock HELICOIL® Tangfree Screwlock Thread types Silver plated Hard coated Coloured: red, green, blue, yellow HELICOIL® Plus Repairing of damaged threads Catalogue No 0180 http://www.boellhoff.de/ en/thread-repair THE BLUE BOOK Aerospace Buyer’s Directory to HELICOIL® Wire Thread Inserts Catalogue No 0130 THE BLUE BOOK Aerospace Buyer’s Directory To HELICOIL® Wire Thread Inserts HELICOIL® Plus repairing of damaged threads http://www.boellhoff.de/ the-blue-book

HELICOIL® Plus thread technology Materials The overview table shows the most common materials with specifications. Temperature resistance Minimum tensile strength at room temperature Stainless steel A 2 X5 CrNi 18 10 material No 1.4301 low temperature –196°C short-term 425°C long-term 315°C Stainless steel A 4 X6 CrNiMoTi 17 12 2 √ material No 1.4571 low temperature –196°C short-term 425°C long-term 315°C Examples of use n Standard applications for all property classes and materials ¬ n General lightweight construction e.g. of aluminium, magnesium or aluminium alloys ¡ n Increased corrosion...