Segmentation by Types classifies bolts according to material, head geometry, drive mechanism and surface treatment, each factor influencing market valuation. Material categories—carbon steel, stainless steel, titanium and alloy—capture roughly 55% of sales, with carbon steel leading due to its cost advantage, while stainless and titanium address corrosion‑critical and weight‑sensitive niches. Head styles—hex, socket, carriage and button—represent 30% of the mix; hex heads dominate construction and automotive sectors, whereas socket heads are preferred in aerospace for torque precision. Drive mechanisms—threaded, self‑tapping, machine—account for 10%, reflecting specialized installation requirements. Surface treatments—zinc plating, black oxide, phosphate—make up the remaining 5%, extending service life in harsh environments. The interplay of these type sub‑segments shapes the total market, with higher‑grade materials and advanced coatings commanding premium pricing within the overall Bolt (Fastener) market.