Factory Price Fasteners Custom shoulder Screws
How To Customize Screws
1. Different drive and head style for customized order
2.Standard: DIN, ANSI, JIS, ISO,Customized on demand
3. Size: From M1-M12 or O#-1/2 diameter
4. Various materials can be customized
5. MOQ: 10000pcs
6. Various surface treatments
How To Purchase Step Screws?
1. Select the step screws to be used according to the needs of the use occasion.
2. The step screws shall be selected according to the specifications of the step screws. When selecting, attention shall be paid to the nominal diameter of the step screws and the screw pitch of the screws. Then, the appropriate step screws shall be selected according to the screw thread specifications and industrial standards.
3. Select according to the thread depth of the mounting step screw.
4. When ordering, we should distinguish the names of step screws and choose them according to different use scenarios, such as external hexagonal step screws, stainless steel internal hexagonal step screws, pan head cross step screws, etc., so when buying, we should highlight a significant feature of the screws and purchase them specifically.
What Are The Acceptance Criteria For Step Screws?
1. First of all, step screws are also the evolution of ordinary screws, and specific inspection items should also be determined according to the surface defect standard of ordinary national standard screws. Please refer to the corresponding national standards for details. If the surface coating and plating affect the identification of surface defects, they should be removed before inspection.
2. Secondly, the overall dimensions and materials of the step screws shall be inspected according to the requirements of the design drawings. In this case, attention shall be paid to material inspection I, and the raw material manufacturer shall provide the material certificate report. 2、 High end products must be provided with SGS material certification and sent to relevant laboratories for material composition analysis to confirm whether the composition content meets the drawing material requirements.
3. Nondestructive inspection is required for functions. In case of any quenching cracks on any part, wrinkles on the bearing surface and below, and whether the coating meets RoSH environmental requirements during non-destructive inspection of step screws.
4. Then there is destructive inspection, such as the corresponding hardness impact test for the hardness grade of step screws; Internal hardness, mechanical property, torque test, etc. will damage non-standard screws, but for step screw manufacturers with strong quality concept, these are all necessary testing items.
