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Hex Nuts and Heavy Hex Nuts

Nuts play a very important part in every bolt and nut connection and depending on their application and the load applied on them are manufactured with different sizes and standards. Choosing the right nut can avoid connection failure and is just as important as choosing the right bolt as opposed to what many technicians believes.

In heavy industries, nuts are used to assemble hex bolts, Socket cap screws and stud bolts. Hex nut standard DIN 934 is the most common nut used along with hex bolts DIN 933 fully threaded, hex bolt DIN 931 partially threaded and socket cap screws DIN 912.

The nuts that are used for heavier duties and the ones used with stud bolts are heavier and thicker and usually are manufactured based on ASTM A194 standard.

The coating and material of nuts usually follow the ones of the bolt. These mean hot deep galvanized nuts are used with hot deep galvanized bolts, and so is correct about plain and Dacromet finishing. The class or grade of the nut also, should be the same as the bolt or even one step above as opposed to what many engineers assume. Therefore, to be attached to hex bolt class 8.8, nut class of 8 or above should be used.

Metric Nuts DIN934

Ajax Bolt Co. manufactures Metric Nuts DIN 934 with different sizes varying from 5 to 36 mm. these nuts are manufactures to be used with hex bolts fully or partially threaded following standards DIN 933 and 931. Depending on your required strength, the nuts are manufactured with different classes 5.6, 8.8, 10.9 and 12.9 as defined internationally. These products are also delivered with different finishing plain, cold-galvanized, hot-deep-galvanized, Dacromet, …

The standard weight and size of Metric Nuts are mentioned in the table below.

ابعاد مهره متریک
Weight 1000 PCs - kg H max G min F max Pitch mm Size mm
1.23 4.00 8.79 8.0 0.8 M5
2.5 5.00 11.5 10.0 1.0 M6
5.2 6.50 14.38 13.0 1.25 M8
11.6 8.00 18.9 17.0 1.5 M10
17.3 10.0 21.10 19.0 1.75 M12
25.0 11.0 24.49 22.0 2.0 M14
33.3 13.0 26.75 24.0 2.0 M16
49.4 15.0 29.56 27.0 2.5 M18
64.4 16.0 32.95 30.0 2.5 M20
79.0 18.0 35.03 32.0 2.5 M22
110.0 19.0 39.95 36.0 3.0 M24
223.0 24.0 50.85 46.0 3.5 M30
393.0 29.0 60.79 55.0 4.0 M36

Nuts Standard ASTM A194

ASTM A194 covers steel, Alloy steel and stainless steel heavy hex nuts for high duties and under higher pressure and temperature. There are different grades of A194 nuts available however Grade 2h is the most common one. Below we have described the material and heating process for these grades.

Hex nut material and heating process ASTM A194 Nut Grade
Heavy Carbon steel Nut2
Quenched and tempered Heavy Carbon steel Nut2H
100% hardness tested, Quenched and tempered Heavy Carbon steel Nut 2HM
Quenched and tempered carbon molybdenum heavy hex nuts4
Quenched and tempered alloy steel heavy hex nuts7
100% hardness tested, Quenched and tempered Heavy alloy steel Nut7M
Charpy impact tested, Quenched and tempered alloy steel heavy hex nuts7L
Stainless steel hex nut Grade 3048
Stainless steel hex nut Grade 3168M

ASTM A194 Heavy hex nuts

Ajax bolt co. manufactures heavy duty hex nuts suitable for high temperature and high pressure according to standard ASTM A194 to be assembled with stud bolts and structure bolts. these nuts are manufactured in different grades 2h, 2hm, 8, 8m.

ASTM A194 Heavy hex nuts
bolt and nut
Metric Nut DIN934

Metric Nut DIN934

Ajax Bolt Co. manufactures metric hex bolts based on standard DIN 934 and in different sizes vary from 5 to 36 mm. also the nuts are manufactured with different materials, low carbon steel, high carbon steel, alloy steel and stainless steel

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