Since May 1, 2013, Luyang China has extended the warranty period for LED UV lamps from the current one year to three years, and accordingly implemented a three-year warranty policy on a global scale. As a leader in the industry, Luyang of the United States has implemented it on a global scale, giving customers peace of mind and peace of mind.
Object product | LUYOR-3110, LUYOR-3130, LUYOR-365 |
Starting period | From May 1, 2013 [about 3 year warranty] Within 3 years after purchasing the product from May 2013 or purchasing the product at the designated dealer. Warranty certificate (with warranty card for the product) is required for repair. The warranty card cannot be provided within 42 months of manufacture according to the product. |
Warranty | If there is a problem with the product itself during the warranty period, we will provide free repair of the product. The following parts and conditions are not covered by the free warranty: â— Rechargeable battery and charger. â— Damage caused by broken or water inflow and human settlement. â— No warranty card, but also tear the product number. â— Change the product number of the product. â— Modified products for other purposes. |
Although there are many types of tapping screws, they all have the following similarities:
(1) are generally made of carbonized carbon steel (accounting for 99% of total production). It can also be made of stainless steel or non-ferrous metals.
(2) The product must be heat treated. Carbon steel tapping screws must be carbonized and stainless steel tapping screws must be solution hardened. In order to make tapping screws to meet the requirements of the standard of mechanical properties and performance.
(3) The product surface hardness is high, the core toughness is good. That is, "soft inside strong outside". This is a major feature of tapping Screw performance requirements. If the surface hardness is low, it can not be screwed into the matrix; If the core toughness is poor, a twist will break, can not be used. So "inside soft outside steel" is self-tapping screw to meet the use of performance, very important requirements.
(4) The surface of the product needs surface protection treatment, generally electroplating treatment. Some product surface must be treated by phosphate (photostatting), such as wall panel self - tapping screws for photostatting.
(5) Production by cold heading process. It is recommended to use high-speed cold heading machine and high-speed wire rolling machine or high-speed planetary wire rolling machine. High speed is emphasized here to ensure product quality. Only the head of tapping screw produced by high-speed machine is well formed and the thread quality is high.
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