ASTM A194 Grade 2h Heavy Hex Nuts

Product Description

2H Heavy Hex Nut

ASTM A194 Grade 2H heavy hex nuts are intended for use in flange bolting applications, as well as structural applications and with other high strength bolting. ASTM A194 covers carbon steel, alloy steel, and stainless steel nuts for bolts in high pressure or high temperature service. Grade markings consists of both the grade symbol "2H" and the manufacturer's identification mark. They are a common high strength nut used with many different bolting grades, including A193 Grade B7, F3125 Grades A325 and A490, as well as with F1554 Grade 105 anchor bolts and studs. Dimensional specifications are governed by ASME B18.2.2. Heavy hex nuts provide increased bearing surface area over finished nuts such as J995 Grade 5 nuts.

 

ASTM A194 Grade 2H Hardness Requirement

Diameter mm	Brinell Hardness	Rockwell C (HRC)	Rockwell B (HRB)
1-1/2 in. or M36, incl	248 to 327	24 to 35	...
over 1-1/2 in. or M36	212 to 327	35 max	95 min

What is 2H material?

ASTM A194 Grade 2H is a standard material specification for high tensile nuts and other internally threaded fasteners, made from carbon steel. Grade 2H nuts can be produced by means of hot forging, cold forging or machining from heat treatment.


ASTM A194 Grade 2H Chemical Composition

Elements	Range
Carbon, min	0.40 %
Manganese, max	1.00 %
Phosphorus, max	0.040 %
Sulfur, max	0.040 %
Silicon, max	0.40 %

 

Proof Load Requirement for ASTM A194 Grade 2H Nuts (Inch/Imperial)

Nominal Size, Inch	Threads per Inch	Stress Area Inch²	Heavy Hex Nuts (lbf)	Hex Nuts (lbf)
1/4	20	0.0316	5 570	4 470
5/16	18	0.0524	9 170	7 860
3/8	16	0.0774	13 560	11 620
7/16	14	0.1063	18 600	15 940
1/2	13	0.1419	24 830	21 280
9/16	12	0.182	31 850	27 300
5/8	11	0.226	39 550	33 900
3/4	10	0.334	58 450	50 100
7/8	9	0.462	80 850	69 300
1	8	0.606	106 000	90 900
1 1/8	8	0.790	138 200	118 500
1 1/4	8	1.000	175 000	150 000
1 3/8	8	1.233	215 800	185 000
1 1/2	8	1.492	261 100	223 800

Applications

• ASTM A194 Grade 2H: These nuts are primarily utilized in the oil, gas, and petrochemical industries, where the fasteners are exposed to high temperatures and pressures. They are compatible with other high-temperature bolting materials, making them ideal for flanges, valves, and pressure vessels.

• ASTM A563 Grade DH: Grade DH nuts are predominantly found in construction and structural applications, securing steel frames, bridges, and other critical structural elements. They are chosen for their high strength, ensuring the safety and integrity of the structural connections.

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ABOUT US

SECON FASTENER, was founded in 2008 and is located in Lianyungang Economic Development Zone with a superior geographical location. With a total investment of 3 million US dollars, Our factory covers an area of more than 50,000 square meters . It is a key fastener enterprise in Jiangsu Province and we are a member of the National Fastener Standardization Technical Committee.

Our factory has strong technical force and complete quality testing equipment, and has passed ISO9001 quality management system certification. The company has multi-station cold heading machines and various fastener manufacturing equipment, raw material annealing furnaces,  heat treatment furnaces, electro-galvanizing production lines and blackening production lines, and multi-functional storage house.

With continuous expand of business, we moved into new factory at the end of 2019. Based on relocation and development as an opportunity to expand production, our company actively explores the market, expands scale and output. We have newly step by step purchased advanced 60 sets of cold heading machines and threading machines, 2 galvanizing production lines, 2 heat treatment production lines, and fully automatic conveyor belts. A total of nearly 3 million has been spent on the purchase of environmental protection facilities. These investments have laid the foundation for the company's long-term development.


 

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