GSR Threaded Tool Quality Control Procedure

As a factory specialising in the manufacture of threading tools, we carry out quality control on our products in the following areas:

Quality control of raw materials and heat-treated products (internal quality)

Material Test Report: Provides third-party material test reports for each batch of steel (specifying the content of elements such as C, W, Mn, Cr, Mo, Co etc.) and compares these against the relevant standards

Metallographic Examination: Microscopic photographs illustrating grain size, carbide distribution and decarburisation depth. Guarantee: “We can ensure that hardness variation following heat treatment is ≤1.5 HRC.”

Hardness Testing

Dimension Inspection: During production, the first item must undergo an initial inspection to ensure that the dimensions are correct; thereafter, a re-inspection must be carried out every ten items, and this process must be repeated

Critical dimensions and thread accuracy (final function)

Projector/video measuring: Displaying actual measurement data for thread profile half-angle, cumulative pitch error, and major, mean and minor diameters

Runout and concentricity: For long taps, this demonstrates the inspection of concentricity between the shank and the threaded section (using a runout gauge and a dial gauge); this is key to preventing stripped threads during tapping.

Scanning electron microscope (SEM) or high-magnification microscope images: showing that the cutting edge is free from chipping, microcracks and grinding burn marks

Standardised service life test video: Using an automatic tapping machine, continuous tapping is performed on materials commonly used by customers (such as 45 steel and 304 stainless steel) until the tool fails, with the number of holes recorded.

GSR has always been committed to providing threading tools of consistent quality, helping our customers to establish a stable sales network and increasing their turnover.

For more information, please contact us at sales@gsrthreads.com