Din933 Hex Bolt Description
DIN933 hexagon bolts are similar to GB5783 hexagon bolts, and they are divided into A and B grades, as well as full thread and half thread. The half-thread hexagon bolts are further divided into coarse-thread and fine-thread types.
Hexagon bolts are the most frequently used type of bolt, and their external threads are matched with nuts to connect two components. The commonly used hexagon bolts in the market are mostly full-threaded.
DIN933 Grade A hexagon bolts are used for bolts with a diameter of 1.6-2.4mm and a length of up to 10d or 150mm, while DIN933 Grade B hexagon bolts are used for bolts with a diameter greater than 24mm or a length greater than 10d or 150mm
Available Surface Treatment
Whitening
Hot Dip Galvanized
Darcromet
Black
Blue White Zinc
Colored Zinc
DIN933 Hexagon Full Thread Bolt Standard
DIN933 hexagon full-thread bolts are based on the German standard DIN933-1987, which specifies full thread hexagon bolts with thread sizes ranging from M1.6 to M52, and product grades of A and B.
The drawing of DIN933 hexagon full thread bolt is shown below:
DIN933 Hexagon Full Thread Bolt Specification:
| Diameter | Pitch | e | k | s | Length | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Grade A | Grade B | nominal diameter | Grade A | Grade B | max | Grade A | Grade B | |||||
| min | max | min | max | min | min | |||||||
| M1.6 | 0.35 | 3.41 | / | 1.1 | 1.22 | 0.98 | / | / | 3.2 | 3.02 | / | 2-12 |
| M2 | 0.4 | 4.32 | / | 1.4 | 1.52 | 1.28 | / | / | 4 | 3.82 | / | 3-16 |
| M2.5 | 0.45 | 5.45 | / | 1.7 | 1.82 | 1.58 | / | / | 5 | 4.82 | / | 3-25 |
| M3 | 0.5 | 6.01 | / | 2 | 2.12 | 1.88 | / | / | 5.5 | 5.32 | / | 4-30 |
| (M3.5) | 0.6 | 6.58 | / | 2.4 | 2.52 | 2.28 | / | / | 6 | 5.82 | / | 5-35 |
| M4 | 0.7 | 7.66 | 7.55 | 2.8 | 2.92 | 2.68 | 3 | 2.6 | 7 | 6.78 | 6.64 | 5-70 |
| M5 | 0.8 | 8.79 | 8.63 | 3.5 | 3.65 | 3.35 | 3.74 | 3.26 | 8 | 7.78 | 7.64 | 6-80 |
| M6 | 1 | 11.05 | 10.89 | 4 | 4.15 | 3.85 | 4.24 | 3.76 | 10 | 9.78 | 9.64 | 6-80 |
| (M7) | 1 | 12.12 | 11.94 | 4.8 | 4.95 | 4.65 | 5.04 | 4.56 | 11 | 10.73 | 10.57 | 7-100 |
| M8 | 1.25 | 14.38 | 14.2 | 5.3 | 5.45 | 5.15 | 5.54 | 5.06 | 13 | 12.73 | 12.57 | 8-110 |
| M10 | 1.5 | 18.9 | 18.72 | 6.4 | 6.56 | 6.22 | 6.69 | 6.11 | 17 | 16.73 | 16.57 | 8-150 |
| M12 | 1.75 | 21.1 | 20.88 | 7.5 | 7.68 | 7.32 | 7.79 | 7.21 | 19 | 18.67 | 18.48 | 10-150 |
| (M14) | 2 | 24.49 | 23.91 | 8.8 | 8.98 | 8.62 | 9.09 | 8.51 | 22 | 21.67 | 21.16 | 10-150 |
| M16 | 2 | 26.75 | 26.17 | 10 | 10.18 | 9.82 | 10.29 | 9.71 | 24 | 23.67 | 23.16 | 12-150 |
| (M18) | 2.5 | 30.14 | 29.56 | 11.5 | 11.72 | 11.28 | 11.85 | 11.15 | 27 | 26.67 | 26.16 | 16-200 |
| M20 | 2.5 | 33.53 | 32.95 | 12.5 | 12.72 | 12.28 | 12.85 | 12.15 | 30 | 29.67 | 29.16 | 16-200 |
| (M22) | 2.5 | 35.72 | 35.02 | 14 | 14.22 | 13.78 | 14.35 | 13.65 | 32 | 31.61 | 31 | 16-200 |
| M24 | 3 | 39.98 | 39.55 | 15 | 15.22 | 14.78 | 15.35 | 14.65 | 36 | 35.38 | 35 | 16-200 |
| (M27) | 3 | / | 45.2 | 17 | / | / | 17.35 | 16.65 | 41 | / | 40 | 22-200 |
| M30 | 3.5 | / | 50.85 | 18.7 | / | / | 19.12 | 18.28 | 46 | / | 45 | 35-200 |
| (M33) | 3.5 | / | 55.37 | 21 | / | / | 21.42 | 20.5 | 50 | / | 49 | 35-200 |
| M36 | 4 | / | 60.79 | 22.5 | / | / | 22.92 | 22.08 | 55 | / | 53.8 | 35-200 |
| (M39) | 4 | / | 66.44 | 25 | / | / | 25.42 | 24.58 | 60 | / | 58.8 | 35-200 |
| M42 | 4.5 | / | 71.3 | 26 | / | / | 26.42 | 25.58 | 65 | / | 63.1 | 40-200 |
| (M45) | 4.5 | / | 76.95 | 28 | / | / | 26.42 | 27.58 | 70 | / | 68.1 | 40-200 |
| M48 | 5 | / | 82.6 | 30 | / | / | 30.42 | 29.5 | 75 | / | 73.1 | 40-200 |
| (M52) | 5 | / | 88.25 | 33 | / | / | 33.5 | 32.5 | 80 | / | 78.1 | 50-200 |
Material of DIN933 Hexagon Bolt
DIN933 hexagon bolts are divided into carbon steel hexagon bolts and stainless steel hexagon bolts according to their materials. The material grades for carbon steel hexagon bolts are as follows: 3mm ≤ d ≤ 39mm: 5.6, 8.8, 10.9, and 3mm ≤ d ≤ 16mm: 9.8.
The selection of materials for carbon steel hexagon bolts is based on heat treatment, as shown in the following table:
DIN933 Stainless Steel Chemical Composition
| Strength Level | Materials and Heat Treatment | Chemical composition (mass fraction)/% | Tempering temperature/℃ | ||||
|---|---|---|---|---|---|---|---|
| C | P | s | B | ||||
| min | max | max | max | max | min | ||
| 4.8 | Carbon steel | - | 0.55 | 0.05 | 0.06 | 0.003 | — |
| 5.6 | 0.13 | 0.55 | 0.05 | 0.06 | 0.003 | — | |
| 8.8 | Low carbon alloy steel (such as boron, manganese or chromium), quenched and tempered or medium carbon steel, quenched and tempered | 0.15 | 0.04 | 0.035 | 0.035 | 0.003 | 425 |
| 0.25 | 0.55 | 0.035 | 0.035 | ||||
| 9.8 | Low carbon alloy steel (such as boron, manganese or chromium), quenched and tempered or medium carbon steel, quenched and tempered | 0.15 | 0.35 | 0.035 | 0.035 | 0.003 | 425 |
| 0.25 | 0.55 | 0.035 | 0.035 | ||||
| 10.9 | Low carbon alloy steel (such as boron, manganese or chromium), quenched and tempered | 0.15 | 0.35 | 0.035 | 0.035 | 0.003 | 340 |
| 10.9 | Medium carbon steel, hardened and tempered or low and medium carbon alloy steel (such as boron, manganese or chromium), hardened and tempered or alloy steel quenched and tempered | 0.25 | 0.55 | 0.035 | 0.035 | 0.003 | 425 |
| 0.2 | 0.55 | 0.035 | 0.035 | ||||
| 0.2 | 0.55 | 0.035 | 0.035 | 0.003 | |||
| 12.9 | Alloy steel, quenched and tempered | 0.28 | 0.5 | 0.035 | 0.035 | 0.003 | 380 |
| Type | group | chemical composition/% | Note | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| C | Si | Mn | P | S | Cr | Mo | Ni | Cu | |||
| Austenitic | A2 | 0.1 | 1 | 2 | 0.05 | 0.03 | 15~20 | — | 8~19 | 4 | ①、② |
| A4 | 0.08 | 1 | 2 | 0.045 | 0.03 | 16~18.5 | 2~3 | 10~15 | 1 | ②、③ | |
- If the chromium content is less than 17%, the minimum nickel content should be 12%.
- For austenitic stainless steel with a maximum carbon content of 0.03%, the maximum nitrogen content can reach 0.22%.
- For products with larger diameters, in order to achieve the specified mechanical properties, there may be a higher carbon content in the manufacturer’s instructions, but for austenitic steels, it should not exceed 0.12%.
Mechanical Properties of Carbon Steel DIN933 Hex Bolts
The mechanical properties of carbon steel hex bolts are shown in the table below:
| Mechanical and Physical Properties | Strength Level | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3.6 | 4.6 | 4.8 | 5.6 | 5.8 | 6.8 | 8.8 | 9.8 | 10.9 | 12.9 | |||||
| d≤16 mm | d>16 mm | |||||||||||||
| Nominal tensile strength σb/Mpa | 300 | 400 | 500 | 600 | 800 | 800 | 900 | 1000 | 1200 | |||||
| Minimum tensile strength σbmin/MPa | 330 | 400 | 420 | 500 | 520 | 600 | 800 | 830 | 900 | 1040 | 1220 | |||
| Vickers hardness HV F≥98N | min | 95 | 120 | 130 | 155 | 160 | 190 | 250 | 255 | 290 | 320 | 385 | ||
| max | 220 | 250 | 320 | 335 | 360 | 380 | 435 | |||||||
| Brinell hardness HBS F=30D2 | min | 90 | 114 | 124 | 147 | 152 | 181 | 238 | 242 | 276 | 304 | 366 | ||
| max | 209 | 238 | 304 | 318 | 342 | 361 | 414 | |||||||
| Rockwell hardness HR | min | HRB | 52 | 67 | 71 | 79 | 82 | 89 | — | — | — | — | — | |
| HRC | twenty two | twenty three | 28 | 32 | 39 | |||||||||
| max | HRB | 95 | 99.5 | |||||||||||
| HRC | — | — | 32 | 34 | 37 | 39 | 44 | |||||||
| Surface hardness HV0.3 max | — | ① | ||||||||||||
| Yield point σs/MPa | Nominal | 180 | 240 | 320 | 300 | 400 | 480 | |||||||
| min | 190 | 240 | 340 | 300 | 420 | 480 | ||||||||
| Specified non-proportional elongation stress σp0.2 | Nominal | — | — | 640 | 640 | 720 | 900 | 1000 | ||||||
| min | — | — | 640 | 660 | 720 | 940 | 1100 | |||||||
| guaranteed stress | Sp/σs or Sp/σpO.2 | 0.94 | 0.94 | 0.91 | 0.93 | 0.9 | 0.92 | 0.91 | 0.91 | 0.9 | 0.88 | 0.88 | ||
| Sp/MPa | 180 | 225 | 310 | 280 | 380 | 440 | 580 | 600 | 650 | 830 | 970 | |||
| Breaking torque MB/N·m min | — | According to GB/T 3098.13 | ||||||||||||
| Elongation after break δ/% min | 25 | twenty two | — | 20 | — | — | 12 | 12 | 10 | 9 | 8 | |||
| Reduction of area ψ/% min | — | 52 | 48 | 48 | 44 | |||||||||
| Impact absorption energy Aku/J min | — | 25 | — | 30 | 30 | 25 | 20 | 15 | ||||||
| head firmness | not to break | |||||||||||||
| Minimum height E of the undecarburized layer of the thread | — | 1/2 H1 | 2/3H1 | 3/4H1 | ||||||||||
| The maximum depth of fully decarburized layer G/min | — | 0.015 | ||||||||||||
| Hardness after tempering | — | The average difference of hardness before and after tempering is not more than 20HV | ||||||||||||
| Surface defects | According to GB/T 5779.1 or GB/T 5779.3 | |||||||||||||
Mechanical Properties of DIN933 Stainless Steel Hex Bolts
DIN933 Full Thread Stainless steel hex bolts are one of the most commonly used fasteners in the stainless steel fastener type. They are usually used in conjunction with nuts and are commonly used in places where the product has high corrosion resistance or high surface finish requirements.
The material of the stainless steel hex bolt is stainless steel, which is made by using stainless steel screw wire to forge into an external hexagonal bolt. AGICO supplies 2 types of stainless steel hex bolts: stainless steel 304 (A2) and stainless steel 316(A4). The price varies according to the different stainless steel materials used, with better materials having a higher price.
| Type | group | performance level | thread diameter | Tensile strength σb min/Mpa | Specified non-proportional elongation stress σp0.2 min/MPa | Elongation after breaking δ min/mm |
|---|---|---|---|---|---|---|
| Austenitic | Al、A2、A3、A4、A5 | 50 | ≤M39 | 500 | 210 | 0.6d |
| 70 | ≤M24 | 700 | 450 | 04d | ||
| 80 | ≤M24 | 800 | 600 | 0.3d |
