Hex Head Screw Weight Table: Complete Guide

Hex head screws are divided into two types: outer hex head screws and inner hex head screws.

Depending on how they connect and withstand force, there are common types and those designed for hinged holes. Bolts for pivot holes must match the size of the hole and are used when subjected to lateral forces.

According to the shape of the head, there are hexagonal, round, square and countersunk heads, among others. Countersunk heads are generally used in places where a smooth surface without protrusions is required after connection, as they can be screwed into parts. Round heads can also be screwed into parts. Square heads may be tighter, but their size is quite large. Hexagonal heads are the most commonly used.

In addition, to meet the need for locking after installation, there are screws with holes in the head or shank. These holes prevent the screw from loosening when subjected to vibration.

Hex head screw material

Currently, the market mainly consists of hex screws made from three types of materials: carbon steel, stainless steel and copper.

(1) Carbon Steel.

We classify this into low carbon steel, medium carbon steel, high carbon steel and alloy steel based on the carbon content of the material.

1. Low carbon steel with C% ≤0.25% is commonly referred to as A3 steel in China. It is essentially known as 1008, 1015, 1018, 1022, etc., abroad. It is mainly used for products without hardness requirements, such as grade 4.8 screws, grade 4 nuts and small screws. (Note: Tail nail drilling mainly uses 1022 material).
2. Medium carbon steel contains 0.25%-0.45% carbon. It is currently not widely used on the market.
3. Alloy Steel: This is common carbon steel with alloying elements added, improving some unique properties of the steel, such as 35, 40 chromium molybdenum, SCM435, 10B38. Fangsheng screws mainly use SCM435 chromium molybdenum alloy steel, which contains C, Si, Mn, P, S, Cr, Mo.

(2) Stainless steel.

Performance grade: 45, 50, 60, 70, 80. The primary division is into austenitic (18%Cr, 8%Ni), which has good heat resistance, corrosion resistance and weldability.

A1, A2, A4 Martensite, 13% Cr, has lower corrosion resistance, high strength and good wear resistance. C1, C2, C4 Ferritic stainless steel, 18% Cr, has better forgeability and greater corrosion resistance than martensite.

The current import materials on the market are mainly Japanese products. The main division by series is SUS302, SUS304, SUS316.

(3) Copper.

The commonly used material is zinc-copper brass alloy. The market mainly uses H62, H65, H68 copper for standard parts.

Carbon steel products use the following metal sheets: serial number, type and optional material. 1. Grade 4.8 Hex Bolts 1008K 1010 1015K 2. Grade 6.8 Hex Bolts.

Hex Head Bolt Weight Table

Specifications (Diameter × Length)	Weight of a thousand screws (kg)
	Nut-free	With nuts
M10×30	29	40
M10×40	35	46
M10×50	41	52
M10×60	47	58
M12×30	41	57
M12×40	49	65
M12×50	58	74
M12×60	67	83
M12×70	76	92
M12×80	85	101
M14×40	69	94
M14×50	81	106
M14×60	93	118
M14×70	105	130
M14×80	117	142
M14×90	129	154
M16×40	92	126
M16×50	106	140
M16×60	122	156
M16×70	138	172
M16×80	154	188
M16×90	170	204
M16×100	185	219
M20×50	183	245
M20×60	205	267
M20×70	230	292
M20×80	255	317
M20×90	279	341
M20×100	304	366
M20×110	329	391
M20×120	354	416
M20×130	378	440
M22×60	250	326
M22×70	280	356
M22×80	310	386
M22×90	339	415
M22×100	369	445
M22×110	399	475
M22×120	429	505
M22×130	459	535
M22×140	489	565
M22×150	519	595
M22×160	548	624
M24×80	388	500
M24×90	424	536
M24×100	459	571
M24×110	495	607
M24×120	531	643
M24×130	566	678
M24×140	602	714
M24×150	637	749
M24×160	673	785
M27×80	519	687
M27×90	564	732
M27×100	609	777
M27×110	654	822
M27×120	699	867
M27×130	744	912
M27×140	789	957
M27×150	834	1002
M27×160	879	1047
M27×170	924	1092
M27×180	969	1137
M30×100	765	999
M30×110	820	1054
M30×120	875	1109
M30×130	931	1165
M30×140	986	1220
M30×150	1042	1276
M30×160	1098	1332
M30×170	1154	1388
M30×180	1210	1444
M30×190	1266	1500
M30×200	1322	1556
M30×210	1378	1612
M30×220	1434	1868
M36×110	1246	1617
M36×120	1326	1697
M36×130	1406	1777
M36×140	1486	1857
M36×150	1566	1937
M36×160	1646	2017
M36×170	1726	2097
M36×180	1806	2177
M36×190	1886	2257
M36×200	1966	2337
M36×210	2046	2417
M36×220	2126	2497
M36×230	2206	2577
M36×240	2286	2657
M42×150	2223	2822
M42×160	2332	2931
M42×170	2441	3040
M42×180	2550	3149
M42×190	2659	3258
M42×200	2768	3367
M42×210	2877	3476
M42×220	2986	3585
M42×230	3095	3694
M42×240	3204	3803
M42×250	3313	3912
M48×150	3005	3962
M48×160	3147	4104
M48×170	3289	4246
M48×180	3431	4388
M48×190	3573	4530
M48×200	3715	4672
M48×210	3857	4814
M48×220	3999	4956
M48×230	4141	5098
M48×240	4283	5240
M48×250	4432	5389
M48×260	4574	5531
M48×280	4858	5815
M48×300	5142	6099

Hex nut specification and weight table

d	s		H			D	Approximate Weight of 1000 Steel Nuts (kg)
	Nominal size	Tolerance	Nominal Dimension	Tolerance
				Raw Manufacturing	Semi-precision manufacturing
6	10	-0.36	5	±0.48	±0.38	11.5	2,317
8	14	-0.43	6			16.2	5,674
10	17	-0.52	8	±0.58	±0.45	19.6	10.99
12	19		10			21.9	4:32 p.m.
-14	22		11	±0.70	±0.55	25.4	25.28
16	24		13			27.7	34.12
-18	27		14			31.2	44.19
20	30		16			34.6	61.91
-22	32	-1	18			36.9	75.94
24	36		19	±1.00	±0.65	41.6	111.9
-27	41		22			47.3	168
30	46		24			53.1	234.2
36	55	-1.2	28			63.5	370.9
42	65		32	±1.50	±0.80	75.5	598.6
48	75		38			86.5	957.3

Observation:

1. If possible, do not use dimensions in parentheses.
2. GB41-66 produces coarse thread (Type A); GB45-66 produces coarse and fine threads (Type A and B).