(a) High grades can replace low grades;
(b) Fine tooth products can replace coarse tooth products;
(c) The assembly may replace a single piece;
(d) The inner plum blossom can replace the cross recess;
(e) PT teeth can replace self-tapping (plastic);
(f) The flange face can replace the hex head.
Combine fastenings with similar or identical fasteners by combinatorial optimization
(1) Minimize the type of fasteners used in the same conditions as the fastener strength grade, surface treatment, thread specifications, etc.;
(2) By combining optimization, the fastening functions are similar or the same fasteners are combined, and the larger amount of fasteners is used as the selected model.
Common fastener design changes
Four-door outer water cut, bottom guard, bumper, etc. exposed to the atmosphere and susceptible to corrosion, the fastener needs to meet 480h no red rust, the surface treatment method is black/gray non-electrolytic zinc-aluminum coating, commonly known as "da "Cro handle", the fasteners of this zinc-aluminum coating surface treatment method have good corrosion resistance and no risk of hydrogen embrittlement.
Hinged back door lock, hatchback side buffer block, fuel filler door retaining limit, seat and other fasteners exposed, generally treated with black galvanized or black non-electrolytic zinc-aluminum coating; appearance color is black fastening The piece has a small visual impact with the peripheral parts and is more versatile.
When the hood is decorated with a common nut, the stud is exposed, and there is a risk of scratching when the hood is opened. It is recommended to use a cap nut to improve workability.