DIN 267 part 30 specifies mechanical properties of thread-forming screws property class 10.9. Thread forming screws according to this standard can form a mating thread M2 to M10 in materials with a maximum hardness of HRB 72.

The play-free thread fit in the mating thread ensures that the screws are firmly retained. Additional locking elements are generally not needed.

Swageform screws have 3 sets of forming lobes at the tapered thread end. A reduced contact Area results in a lower drive torque.

TAPTITE 2000: The Taptite 2000 design combines benefits of taptite ii, and Duo-taptite fasteners, with an even lower driving torque. Taptite 2000 fasteners introduced the Radius Profile thread design. The TRILOBULAR® principle is maintained with a dual lobularity in the screw body, while incorporating the Radius Profile™ Thread.

In thin sheet metals an extruded hole will increase the pull-out force.  Under comparable conditions, pull- out tests show always higher values for Taptite screws than for standard screws in tapped holes. The test was conducted with taptite screws; other thread-forming screws will show similar results depending on the amount of work hardening of the internal thread.

Triform screws are characterized by forming lobes at the tapered thread end. As per company brochure it has a low driving torque. There is also another type – it’s called Triform DB which has a more tapered point.

A special thread point offers forming pressure relief, which lowers the driving torque. The tapered point with relief indentations extends all the way up into the body where the circumference of the threads is at their largest diameter (360° round body). The low initial driving torque enable easy engaging, making the fastener ideal for applications where accessibility to the pilot hole is hampered, eliminating cross threading.

The thread of the Taptite screws has the characteristic trilobular cross-section on its entire length. The trilobular cross-section of the thread, facilitates thread forming when the screw is driven in. The tapered end is necessary for starting the tapping process. This geometric shape is called oriform curve. They have the same diameter, irrespective of the direction the diameter is measured.

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Thread-forming screws are extremely reliable and safe They are very cost-efficient and should be used instead of regular screws whenever this is feasible.

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This type of fastener is tightened after they have been driven in. However, typically the final tightening is just snugging up the parts. One does not induce a controlled preload, as this is the case with regular screws.

Taptite screws must be assembled with electric or pneumatic screw drivers. The driving speed should not exceed 1000 RPM.

The maximum length of the taper should be 3 to 4 x the thread pitch. The tapered thread end does not have a load bearing function. Should the thread forming screws get lost in service, they may be replaced through regular screws.

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Low carbon steels with cold heading quality are typically utilized for thread forming screws. The mechanical properties and performance requirement are covered by:

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Taptite screws made of a strain-hardened austenitic steel A2(AISI 304) or A4(AISI 316) are also available. However, they can only be used in soft aluminum alloys.

The Spiralform screw has 4 raised lobes, arranged in a spiral pattern alongside the thread, enabling forming a thread in the mating part. the thread can be formed with a low driving torque This type of thread causes little radial stress, thus is well suited for aluminum key extrusions.

Tests simulating practical situations must show that the selected screw is adequate. The functional performance of the thread-forming screw is tested with the following test. Thread forming screws are driven into metal plates of defined hardness. The sheet thickness and the pilot hole diameters are given for each screw dimension. The screws shall be turned in with a torque measuring instrument till their specific conical thread end has emerged on the reverse side. At this point, the maximum thread-forming torque (Nm) is reached.

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Taptite II: The Taptite II® thread-forming screw is a further development of the original Taptite. The design allows lower driving torques. Taptite II forms threads in Sizes 00/M1 to as large as 1”/M24.

Duo-taptite: Duo-taptite screws have large lobulation, meaning a more trilobular cross section at the screw’s point, for easy entry and low driving torque. In the mid-section it has a reduced lobulation, meaning a more round cross section, thus providing a higher pull-out force and breaking torque. DUO-TAPTITE is superseded by TAPTITE PRO

It is crucial that the minimum breaking torque (torsional strength) of thread-forming screws is high enough for intended application. The tightening torque for thread forming must be well below the minimum breaking torque, to avoid difficulties during assembly.

Thread-forming screws are usually available in the diameters ranging from 2-8 mm ( 2-56 to 5/16”). They are used in metals and plastics. Consequently, their specific threads are different.

Fastening of the screws is different to that of regular screws. The forming of threads produces a certain resistance therefore they need to be installed with a power screwdriver.

Thread-forming displaces material; thus, a small bulge is produced at the hole’s entrance. This may prevent parts from being tightly fastened. A 90º chamfer, with a depth of 0.5 to 1 x the thread pitch, will avert that. A shallow relief bore will do the same.

Taptite Pro : Taptite Pro has a Parabolic thread Profile (slight curved convex section). This thread form, when combined with the TRILOBULAR® cross section, provides low driving torque, high resistance to vibrational loosening along with high pull-out force. Taptite Pro is the latest taptite design.

Blind hole assembly in aluminum, penetration depth 8 mm: Taptite M4 has a high pull-out resistance. The machine screw M5, property class 4.8 broke at a lower tensile load.

The breaking or stripping torque, whichever is lower, minus the driving torque value. For through holes, the difference is divided by 2, the result is added to the driving torque value. For blind holes the difference is divided by 3.

The screws have a slightly tapered end point for easy insertion. The points length should not exceed 4x the thread pitch P.

The Tap/R thread-forming screw consists of a distinctive thread arrangement that starts out as an intermittent, tapered thread and increases to a complete 360° thread form. The mating thread is formed gradually with minimal driving torque. The tapered point of these thread forming fasteners easily locates the pilot hole and eliminates cross-threading.

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To choose the best possible thread-forming screw, the decision should be based on the intended application. Application testing should be performed.  One should work with an application engineer that is familiar with thread forming screw applications, one that gives advice based on the product features that are most suitable for the application.

“Taptites” have been around for more than 40 years. Over the years different styles emerged. It may be difficult to see the difference. Most of them are designed for unique applications. In most cases the original taptite will do just fine. If a specific type is necessary, it ought to be based on the intended application. One should perform application testing to determine which one is most suitable.

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Dear Reader: In the last Link issue, we focused on tapping screws; in this article we continue with the thread-forming screws that form regular threads. There are quite a few different styles to cover. It is not always easy to find the advantages of one over the other.

Due to the oriform cross section, the thread can be rolled with normal thread rollers. If this were not possible, the screws could not be manufactured cost-efficiently.

Rolok screw has 3 raised lobes, like Spiralform, they are arranged in a spiral pattern alongside the thread, allowing the forming of a thread in the mating piece. Rolok offer excellent drive-to-strip performance in many applications.

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The play-free thread engagement of Taptite screws and their friction, secure assembled screws against spontaneous loosening. Thus, locking elements such as lock washers are not necessary when using Taptite screws.

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There are also oriform curves with 5 and more “corners.” The circle is ultimately an oriform curve with an infinite number of “corners.” The torque for thread forming is very low in such screws.

During thread forming the compressive strains are concentrated on the 3(4) “edge areas”. The mating material is more easily deformed this way. The friction between screw thread and mating material is limited to the 3(4) “edges”.

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MAThread and MATpoint uses a thread shape that prevents threaded fasteners from cross threading and/or jamming. Due to its thread design, misaligned MAThread fasteners routinely become aligned with their mating parts during assembly. MAThread is widely used for cars, trucks, motorcycles, snowmobiles, all-terrain vehicles.

The screw is clamped in a mating split collet with at least 1 full thread protruding above the collet. The screw is tightened with a calibrated torque measuring instrument until it breaks. The minimum required breaking torque must be achieved. The measured breaking torque has no relation to intended assembly. It only confirms that the specified minimum breaking torque is met.

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ISO 7085 standard specifies case-hardened steel. In the final heat treatment, they get a hardness of min. 450-550 HV (HRC 45-52) on the surface. The core is softer, with a hardness of 240-350 HV (HRC 20-35), (thus is tougher).The hard surface is necessary for forming the thread in the mating part.

There are no chips produced during the thread-forming process. Instead, the material is displaced in the mating part, it strengthens the material of the host part.