Self Tapping Screw
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One of the most common machine screw types, Pan Head Screws have a wide head style with chamfered / curved sides and a recessed Phillips drive.
Self-drilling screws eliminate the need for a pilot hole but can tap as well. Self-tapping screws tap their own threads but cannot drill through metal and require a pilot hole. These screws are not interchangeable, and mixing up the two can cause many headaches or possible failures in the field.
As a rough guide, a pilot hole should be between the minor diameter and major diameter of the screw thread. For example: a #6 screw (major diameter of threads ~3.5mm, minor diameter ~2.5mm) would typically need a pilot hole of 2.7-3mm depending on the hardness / toughness / density / lubricity of the material.
In general, the pilot hole size for wood screws should be approximately the same diameter as the screw's shank minus the threads. Woodworkers often make the pilot hole too small, believing a tighter space will make the screw hold better. However, a screw only pulls two pieces of wood together.
| Head type | Pan head | |||
| Drive type | Philips | |||
| Finish | Plain | |||
Material | Stainless steel, carbon steel | |||
| Application | for fixing timber, furniture, particle board, and sub-flooring application | |||
Measurement system | Metric | |||
Brand name | Zhuocheng | |||
Standard | DIN | |||
Grade | 4.8,6.8,8.8,10.9,12.9, Grade2, Grade5 | |||
Size | M3-M6 | |||
Certificate | ISO9001-2008 | |||
Sample | Provided | |||
Service | Provided | |||
Single packaging size | 25*25*16CM | |||
Singe gross weight | 25kg | |||
Package type | (1)Small box packging | |||
(2)25-30kgs/ctn in bulk, 36-48cartons/pallet | ||||
(3)Assortment in poly bag or plastic box | ||||
Delivery time | Quantity | Delivery time | ||
1-1000pcs | 3 days | |||
1001-5000pcs | 7 days | |||
5001-10000pcs | 9 days | |||
＞10000pcs | To be negotiated | |||
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They are now widely exporting to 200 countries.
Wuxi Zhuocheng Mechanical Components Co., Ltd. is established in 1990, and one group of manufacturing and selling professional fastener
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