Prevent screw stripping – The most common assembly problem
Screw stripping-off occurs when the tension generated during tightening exceeds the nut’s shear strength. When this happens, the screw may turn inside the hole, reducing the torque value. As a result, the joint loses strength, the assembly’s reliability is compromised, and costly, time‑consuming repairs may be required. Several factors can affect stripping torque values, including applied torque, thread engagement, hole diameter, and friction.
Our Engineering Service team specializes in diagnosing and solving stripping problems. Through comprehensive testing and analysis, we pinpoint the root causes and determine the optimal tightening strategy and screw design to best suit your application and assembly requirements.
At CELO, we offer a wide range of specialized screw threads designed to prevent stripping across plastics, metals, and thin sheet materials.
Need help stopping screw stripping?
REMFORM® II HS™
REMFORM® II HS™ is designed for direct assembly into high‑strength and fiber‑reinforced plastics. These screws feature the Unique Radius Flank™ asymmetrical thread form, which provides a larger contact surface with the thread flanks. This results in increased resistance to internal thread stripping and a more secure fastening. The optimized thread geometry also allows the screw to be reused with minimal risk of damage, further reducing the chance of stripping.
The graph below illustrates a comparison of threading curves for REMFORM® II HS™ and a standard screw for plastic, both diameter Ø6,0 mm in a PP + 20% glass fiber part, core hole Ø5,0 and 12 mm engagement length.
When comparing with a conventional screw for plastic, REMFORM® II HS™ screw offers greater safety during assembly (difference between threading torque and failure torque). The higher stripping torque guarantees a more reliable assembly process and an increased stability during installation.
TAPTITE 2000®
TAPTITE 2000® thread rolling screws are ideal for assembling steel and die‑cast parts. The Radius Profile design optimizes material displacement, delivering high pull‑out resistance and superior stripping torque for secure, long‑lasting joints. By forming threads through cold lamination, TAPTITE® screws avoid chip creation and enhance joint strength and reliability.
TAPTITE PRO®
TAPTITE PRO® fasteners provide an improved failure mode: at standard engagement lengths, the screw fractures within its own threads when overtightened, preventing damage to the nut member or casting. This protective feature is effective in both steel and soft metal applications, reducing the risk of costly repairs and downtime.
FASTITE® 2000™
Stripping is a common challenge when assembling thin metal sheets. FASTITE® 2000™ rolling screws are specially designed for use in untapped sheet metal with a thickness of less than one-third of the screw’s diameter, ensuring secure joint compression without the risk of stripping.
The twin‑lead thread design and serrations under the screw head increase resistance to stripping and improve starting stability, enabling a faster, more reliable fastening process.
The following graph compares a DIN 7981 screw with a FASTITE® 2000™ screw in a 1.4 mm‑thick aluminum sheet.
FASTITE® 2000™ screws deliver enhanced assembly security and process reliability thanks to their high assembly torque safety margin—the difference between low threading torque and stripping torque. The twin‑lead thread design and greater engagement length provide higher stripping torque values, ensuring robust joints and minimizing the risk of thread failure during assembly.
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