UNF stands for 'Unified Fine', which is also a popular thread in the United States. UNF fixings are often used in the automotive and aerospace industries industry because of the requirement for tight, fine threads. UNF fasteners are typically made from steel or stainless steel fasteners.
Flat Head Screws, also called Countersunk Screws, are conical with a flat outer face and a tapering inner face. An advantage to this type of screw is that very little of the head protrudes beyond the surface, allowing it to sink into the material. These screws are commonly made out of stainless steel or zinc coating.
Iron or aluminium alloy is the most common material in automotive projects. Typically the most durable and reusable material, most bolts are covered in zinc for rust protection and durability.
| Item | M4-M8 flat head with hole sucker non-standard step profile screw | |
| Application | automotive | |
| Finish | Plain, Black Oxide, Gray, Paint, Ruspert, Nickel | |
| System of measurement | Metric or inch | |
| Material | Brass, Stainless steel, Steel, Aluminium | |
| Standard | DIN | |
| Size | 2.9x10mm--6.3x200mm | |
| Certificate | ISO9001-2008 | |
| Customization | Provided | |
| Single packaging size | 25*25*16cm | |
| Singe gross weight | 25kg | |
| Sample | Free | |
| Packing | Carton+plastic bags | |
| (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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