Hex bolts are a specific type of threaded bolt defined by their head’s six-sided hexagonal shape. Hex bolts are suitable for use in a variety of applications, typically in machinery and construction, and can be fully or partially threaded. Hex bolts or hexagonal bolts are a type of threaded bolt that is distinguished by their six-sided hexagonal-shaped head. Hex bolts are designed to securely fasten two or more components together by threading the shaft into a compatible threaded hole or nut. They can be either fully threaded or partially threaded and are useful in a wide range of applications including automotive, machinery, furniture, and construction. The hexagonal head provides multiple flat surfaces, making it easier to grip and manipulate using a wrench or socket tool during installation or removal.
Hex bolts come in a range of types, sizes, materials, and finishes. It provides the user the freedom and flexibility to choose the bolt best suited for the specific application. Hex bolts are also known as hex head bolts due to their distinctive head shape

The threaded shaft of a hex bolt allows it to create a strong and reliable connection by exerting pressure between the fastened components, preventing them from coming apart under load or vibration. Hex bolts are commonly made from various materials, such as stainless steel, carbon steel, or alloy steel, each offering specific levels of strength, durability, and corrosion resistance. They can also be coated with materials like zinc or other anti-corrosion coatings to enhance their longevity and performance in different environments.

Hex Bolt.

Hex bolts possess a distinct shape that makes them instantly recognizable. The primary parts of hex bolts include

Hexagonal Head:.

The most distinguishing feature of hex bolts is their hexagonal (six-sided) head. This shape provides multiple points of contact, making it easier to grip and manipulate using a wrench or socket

Threaded Shaft.

The shaft of a hex bolt is threaded, which means it has spiral grooves that allow it to screw into a compatible threaded hole. The threading is essential for creating a secure and tight connection between two components.

Unthreaded Shank:

The portion of the bolt between the head and the threaded section is known as the unthreaded shank (Refer to Fig. 1). This section adds structural integrity to the bolt and prevents it from being threaded all the way through a component.

Types of Hex Bolts.

The types of hex bolts vary based on several factors such as size, material, threading, and head style.

Fully Threaded Hex Bolts: These hex bolts have threading that spans the entire length of the shaft. They are used when maximum grip and clamping force are required, and they allow for more flexibility in adjusting the position of the nut along the bolt.

Partially Threaded Hex Bolts: Partially thread hex bolts have threading that covers only a portion of the shaft, leaving an unthreaded shank below the head. These bolts are often used in situations where the unthreaded portion provides structural support or prevents the bolt from threading through a component.

 

Hex Bolt Dimensions (ANSI B18.2.1-2012)– Inch Series
Nominal Size	Basic Product Diameter	Body Diameter E		Width Across Flat (F)			Width Across Corners (G)		Head Height (H)			Radius of Fillet (R)		Thread Length (LT)
		Max	Min	Basic	Max	Min	Max	Min	Basic	Max	Min	Max	Min	Basic (6 in. and shorter)	Basic (Over 6 in.)
1/4	0.2500	0.26	0.237	7/16	0.438	0.425	0.505	0.484	11/64	0.188	0.15	0.03	0.01	0.75	1
5/16	0.3125	0.324	0.298	1/2	0.5	0.484	0.577	0.552	7/32	0.235	0.195	0.03	0.01	0.875	1.125
3/8	0.3750	0.388	0.36	9/16	0.562	0.544	0.65	0.62	1/4	0.268	0.226	0.03	0.01	1	1.25
1/2	0.5	0.515	0.482	3/4	0.75	0.725	0.866	0.826	11/32	0.364	0.302	0.03	0.01	1.25	1.5
5/8	0.625	0.642	0.605	15/16	0.938	0.906	1.083	1.033	27/64	0.444	0.378	0.06	0.02	1.5	1.75
3/4	0.75	0.768	0.729	1. 1/8	1.125	1.088	1.299	1.24	1/2	0.524	0.455	0.06	0.02	1.75	2
7/8	0.875	0.895	0.852	1. 5/16	1.312	1.269	1.516	1.447	37/64	0.604	0.531	0.06	0.02	2	2.25
1	1.0	1.022	0.976	1. 1/2	1.5	1.45	1.732	1.653	43/64	0.7	0.591	0.09	0.03	2.25	2.5
1 1/8	1.125	1.149	1.098	1 11/16	1.688	1.631	1.949	1.859	3/4	0.78	0.658	0.09	0.03	2.5	2.75
1 1/4	1.25	1.277	1.223	1 7/8	1.875	1.812	2.165	2.066	27/32	0.876	0.749	0.09	0.03	2.75	3
1 3/8	1.375	1.404	1.345	2  1/16	2.062	1.994	2.382	2.273	29/32	0.94	0.81	0.09	0.03	3	3.25
1 1/2	1.5	1.531	1.47	2 1/4	2.25	2.175	2.598	2.48	1	1.036	0.902	0.09	0.03	3.25	3.5
1 5/8	1.625	1.658	1.591	2  7/16	2.438	2.356	2.815	2.616	1  3/32	1.116	0.978	0.09	0.03	3.5	3.75
1 3/4	1.75	1.785	1.716	2 5/8	2.625	2.538	3.031	2.893	1  5/32	1.196	1.054	0.12	0.04	3.75	4
1 7/8	1.875	1.912	1.839	2 13/16	2.812	2.719	3.248	3.099	1 1/4	1.276	1.13	0.12	0.04	4	4.25
2	2	2.039	1.964	3	3	2.9	3.464	3.306	1 11/32	1.388	1.175	0.12	0.04	4.25	4.5
2 1/4	2.25	2.305	2.214	3 3/8	3.375	3.262	3.897	3.719	1 1/2	1.548	1.327	0.19	0.06	4.75	5
2 1/2	2.5	2.559	2.461	3 3/4	3.75	3.625	4.33	4.133	1 21/32	1.708	1.479	0.19	0.06	5.25	5.5
2 3/4	2.75	2.827	2.711	4 1/8	4.125	3.988	4.763	4.546	1 13/16	1.869	1.632	0.19	0.06	5.75	6
3	3	3.081	2.961	4 1/2	4.5	4.35	5.196	4.959	2	2.06	1.815	0.19	0.06	6.25	6.5
3 1/4	3.25	3.335	3.21	4 7/8	4.875	4.712	5.629	5.372	2  3/16	2.251	1.936	0.19	0.06	6.75	7
3 1/2	3.5	3.589	3.461	5 1/4	5.25	5.075	6.062	5.786	2  5/16	2.38	2.057	0.19	0.06	7.25	7.5
3 3/4	3.75	3.858	3.726	5 5/8	5.625	5.437	6.495	6.198	2 1/2	2.572	2.241	0.19	0.06	7.75	8
4	4	4.111	3.975	6	6	5.8	6.928	6.612	2 11/16	2.764

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