Precision Machine Screws Supplier & Factory

Thread rolling is a cold-forming process that displaces rather than removes parent material. This process continuous the raw material's metallurgical grain lines through the root and crest of the thread, increasing fatigue resistance by up to 20-30% compared to machine-cut threads. Rolled threads also feature burnished root radii that eliminate stress concentration notches, reducing the risk of fatigue failures under dynamic cyclic loading.

The Phillips drive was engineered to cam out intentionally when a torque limit was reached, preventing overtightening in softer materials. In automated assembly lines, this cam-out action introduces tool slippage, driver wear, damaged recesses, and metallic debris. In contrast, the 15-degree drive angle of a Torx (hexalobular) recess provides direct radial contact, eliminating cam-out force, reducing required axial pressure, and extending bit service life by up to tenfold.

When high-strength carbon steel fasteners are acid-pickled and electroplated, atomic hydrogen can diffuse into the interstitial crystal lattice, creating internal stress concentrations that can lead to delayed brittle failure under service preload. To prevent this, YH Fastener subjects high-tensile components (≥1000 MPa tensile strength or ≥31 HRC hardness) to immediate post-plate thermal de-embrittlement baking at 200°C–220°C for 4 to 8 hours within 4 hours of plating, in full accordance with ISO 4042 and ASTM F1940 standards.

Yes. We run micro-cold-heading multi-station machines capable of forming precision micro machine screws down to M0.8 and M1.0 sizes. These are commonly used in micro-stepper motors, wearables, smart glass chassis, and medical endoscope modules. Optical sorting equipment with high-magnification telecentric lenses is used to verify pitch, thread profile, and concentricity across high-volume production runs.

We offer three main factory-applied thread locking methods: 1. Polyamide (Nylon) Patches: A 90° to 360° spray or fusion patch that creates prevailing torque through interference fitting, reusable up to 5 times. 2. Microencapsulated Chemical Adhesives (e.g., DIN 267-27): Anaerobic micro-capsules that rupture upon thread engagement to cure into a rigid locking compound. 3. Mechanical Sems Combinations: Captive free-spinning helical spring or conical (Belleville) washers mounted prior to thread rolling to maintain pre-load tension under cyclic joint contraction.