ASTM A194 GR 8 Heavy Hex Nuts

zhao77jie — Mon, 08 Sep 2025 02:00:00 +0000

In March of this year, we quoted some stud bolts and nuts for customer from France. This client ordered several items in May and in July, they ordered ASTM A194 GR 8 Heavy Hex Nuts below as supplement. 1 week later, goods are ready to be picked up. Based on former experience, we packed the nuts every 50 pcs and shared photos to client. After confirming the shipping mark, the nuts are picked successfully.

Inspection Photos

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ASTM A194 Gr.8 Stainless Steel Heavy Hex Nuts, SS 304

Element	ASTM A194 Grade 8
Carbon	0.08 max
Manganese	2.00 Max
Phosphorus, max	0.05%
Sulfur, max	0.03%
Silicon	1.00% max
Chromium	18.0-20.0%
Nickel	8.0-11.0%
Molybdenum	–

ASTM A194 Standards

This specification covers a variety of carbon, alloy, and martensitic stainless steel nuts in the size range 1⁄4 through 4 in. and metric M6 through M100 nominal. It also covers austenitic stainless steel nuts in the size range 1⁄4 in. and M6 nominal and above. These nuts are intended for high-pressure or hightemperature service, or both. Grade substitutions without the purchaser’s permission are not allowed.

Bars from which the nuts are made shall be hot-wrought. The material may be further processed by centerless grinding or by cold drawing. Austenitic stainless steel may be solution annealed or annealed and strain-hardened. When annealed and strain hardened austenitic stainless steel is ordered in accordance with Supplementary Requirement S1, the purchaser should take special care to ensure that 8.2.2, Supplementary Requirement S1, and Appendix X1 are thoroughly understood.

Stainless Steel ASTM A194 8/8M/8T Equivalent Grade

Grade	Country	304	304 L	310	316	316 L
ASTM	America	ASTM A 193 Gr B8	ASTM A 320 Ge B8	ASTM A 479	ASTM A 193 Gr B8T	ASTM A 320 Ge B8T
UNS	North America	S30400	S30403	S31000	S31600	S31603
EN	European	1.4301	1.4306	1.4841	1.4401	1.4404
BS	British	BS 970	BS 970	BS 970	BS 970	BS 970
DIN	German	X 5CrNi1810	X 2CrNi1911	X 12 CrNi 25 21	X 5 CrNiMo 17 13 2	X 2 CrNiMo 17 13 2

ASTM A194 Grade 8 Nuts Manufacturer and Exporter

ZIZI is a professional manufacturer and exporter of ASTM A194 Grade 8 heavy-duty hex nuts, dedicated to providing global customers with high-quality, high-strength fastener products. The company strictly adheres to ASTM A194 standards in production, with each nut undergoing precise inspection to ensure stable and reliable performance under high-temperature, high-pressure, and demanding conditions. Our products are widely used in petroleum, natural gas, chemical, and power industries, meeting customized requirements for diverse projects. We deliver to global markets safely and efficiently through international logistics.

ASTM A194 Grade 8 Nuts Proof Load Using Threaded Mandrel (Inch Series)

Nominal Size, in.	Threads per Inch	Stress Area in. 2	Proof Load, lbf A
			All Types of Grade 8
			Heavy HexH	HexI
1/4	20	0.0316	2 540	2 380
1/3	18	0.0524	4 190	3 930
3/8	16	0.0774	6 200	5 810
7/16	14	0.1063	8 500	7 970
1/2	13	0.1419	11 350	10 640
5/9	12	0.182	14 560	13 650
5/8	11	0.226	18 080	16 950
3/4	10	0.334	26 720	25 050
7/8	9	0.462	36 960	34 650
1/	8	0.606	48 480	45 450
1 1/8	8	0.79	63 200	59 250
1 1/4	8	1	80 000	75 000
1 3/8	8	1.233	98 640	92 450
1 1/2	8	1.492	119 360	111 900

ASTM A194 Grade 8 Nuts Proof Load Using Threaded Mandrel (Metric)

Nominal Size, mm	Threads Pitch	Stress Area mm 2	Proof Load, kNA
			All Types of Grade 8
			Heavy Hex H	Hex I
M6	1	20.1	11.1	10.4
M8	1.25	36.6	20.1	18.8
M10	1.5	58	31.9	29.9
M12	1.75	84.3	46.4	43.4
M14	2	115	63.3	59.2
M16	2	157	86.4	80.9
M20	2.5	245	134.8	126.2
M22	2.5	303	166.7	156
M24	3	353	194.2	181.8
M27	3	459	252.5	236.4
M30	3.5	561	308.6	288.9
M36	4	817	449.4	420.8

Gr8 A194 Heavy Hex Nuts 304 Stainless Dimension

Heavy Hex Nuts:Dimensions(ANS/ASME B18.2.2)
Nominal or Basic Major Diameter of Thread Click on the size to search products		Width Across Flats(F)			Width Across Corners(G)		Thickness of Hex Nuts(H)
		Basic	Max	Min	Max	Min	Basic	Max	Min
1/4	0.2500	1/2	.500	488	.577	.556	15/64	0.250	0.218
5/16	0.3125	9/16	562	546	650	622	19/64	0.314	0.280
3/8	0.3750	11/16	688	669	.794	.763	23/64	0.377	0.341
7/16	0.4375	3/4	.750	.728	.866	830	27/64	0.441	0.403
1/2	0.5000	7/8	875	850	1.010	969	31/64	0.504	0.464
9/16	0.5625	15/16	.938	909	1.083	1.037	35/64	0.568	0.526
5/8	0.6250	1-1/16	1.062	1.031	1.227	1.175	39/64	0.631	0.587
3/4	0.7500	1-1/4	1.250	1.212	1.443	1.382	47/64	0.758	0.710
7/8	0.8750	1-7/16	1.438	1.394	1.660	1.589	55/64	0.885	0.833
1	1.0000	1-5/8	1.625	1.575	1.876	1.796	63/64	1.012	0.956
1-1/8	1.1250	1-13/16	1.812	1.756	2.093	2.002	1-7/64	1.139	1.079
1-1/4	1.2500	2	2.000	1.938	2.309	2.209	1-7/32	1.251	1.187
1-3/8	1.3750	2-3/16	2.188	2.119	2.526	2.416	1-11/32	1.378	1.310
1-1/2	1.5000	2-3/8	2.375	2.300	2.742	2.622	1-15/32	1.505	1.433
1-5/8	1.6250	2-9/16	2.562	2.481	2.959	2.828	1-19/32	1.632	1.556
1-3/4	1.7500	2-3/4	2.750	2.662	3.175	3.035	1-23/32	1.759	1.679
2	2.000	3-1/8	3.125	3.025	3.608	3.449	1-31/32	2.013	1.925
2-1/4	2.2500	3-1/2	3.500	3.388	4.041	3.862	2-13/64	2.251	2.155
2-1/2	2.5000	3-7/8	3.875	3.750	4.474	4.275	2-29/64	2.505	2.401
2-3/4	2.7500	4-1/4	4.250	4.112	4.907	4.688	2-45/64	2.759	2.647
3	3.000	4-5/8	4.625	4.475	5.340	5.102	2-61/64	3.013	2.893
3-1/4	3.2500	5	5.000	4.838	5.774	5.515	3-3/16	3.252	3.124
3-1/2	3.5000	5-3/8	5.375	5.200	6.207	5.928	3-7/16	3.506	3.370
3-3/4	3.7500	5-3/4	5.750	5.562	6.640	6.341	3-11/16	3.760	3.616
4	4.0000	6-1/8	6.125	5.925	7.073	6.755	3-15/16	4.014	3.862

ASTM A194 2H vs Grade 8 – What’s the Diffference

ASTM A194 2H and Grade 8 are both heavy-duty hex nuts primarily used for fastening applications in high-temperature, high-pressure, and demanding conditions. 2H nuts are typically made of alloy steel and undergo heat treatment, offering excellent tensile strength and high-temperature resistance. They are suitable for industries such as petroleum, chemical, and power generation. Grade 8 nuts offer slightly superior mechanical properties, with enhanced tensile strength and yield strength, enabling them to withstand greater load pressures.

Additionally, both differ in applicable standards and dimensions. 2H nuts are commonly used with bolts conforming to the ASTM A194 standard, while Grade 8 nuts are widely employed in SAE standard bolt systems. Selection should be based on the specific working environment, load requirements, and standard specifications to determine the most suitable nut grade.

Applications

Oil and gas piping systems

Pressure vessels and boilers

Power and energy industries

Chemical and petrochemical equipment

High-temperature and high-pressure flange connections

Advantages

High strength – Suitable for high-load applications.

High-temperature resistance – Maintains stable performance under high-temperature conditions.

Corrosion resistance – Alloying elements enhance corrosion resistance.

Various specifications – Customizable according to international standards and customer requirements.

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