
SA 194 Gr 7 Heavy Hex Nuts and Washer manufacturer in India
ASTM A194 Grade 7 Nuts belong to a specification for chromium molybdenum alloy steel that are heat treated and internally threaded. Viha Steel & Forging is a leading manufacturer and supplier of the different grades of the ASME SA 194 Gr 7 Hex Nut and others. The hex nuts are very common in this grade as they are much suitable for high torque tightening. There are different grades in the A194 specification such as AISI 4140, 4142, 4245 and 4145H. The ASTM A194 Gr 7 Heavy Hex Nuts are produced with hot forging, cold forging and machining from heat treated bar stock.
The material is made up of carbon, manganese, phosphorus, sulfur, silicon, chromium and molybdenum. The different fasteners such as the ASTM A194 Grade 7 Washer and others are quenched and tempered at 595 degrees Celsius and the Brinell hardness increases up to 248 to 327BHN. The fasteners sizes range from ¼ inches to 1 ½ inches with threads ranging from 8 threads per inch to 20 threads per inches.
The SA 194 Grade 7 Nuts range from M6 to M100 with tensile strength ranging from 150ksi to 175ksi. The application of these fasteners is seen in the oil and gas, petroleum, chemical, pharmaceutical and power generation industries. The astm a194 grade 7l nuts can also be applied in coolers, heaters, heat exchangers, condensers and in boiler grade applications. As a leading manufacturer of the different types of these fasteners, we can supply any of your order requirements. Please feel free to contact us for the different fasteners such as the SA194 Grade 7 Flat Washer and the prices.
ASTM A194 Grade 7 Nuts |
Price |
Factory price astm a194 grade 7 heavy hex nut |
US$ 0.20-US$ 20.00 / Piece |
Stock ASTM A194 GR 7 Heavy Hex Bolt |
US$ 0.01-US$ 1.00 / Piece |
astm a194 gr 7 heavy double hex nut m74 |
US$ 0.971-US$ 1.44 / Kilogram |
Grade & Type | Brinell Hardness | Rockwell Hardness | |
---|---|---|---|
C Scale | B Scale | ||
7 | 248-327 | 24 - 35 | - |
While A194 Grade 4 and A194 Grade 7 nuts are precisely indistinguishable and have similar planned applications, the lone contrast is the compound qualities (also known as steel used to produce). Evaluation 4 was made to be an ease choice to Grade 7 by utilizing a cheaper crude material. Tragically, this didn't work out. The thought was that the material used to make Grade 4 was less expensive, and subsequently the nuts would be less expensive. Practically speaking that was not the situation. Since the steel used to fabricate Grade 7 nuts is mass created and the material used to make Grade 4 was not, Grade 7 nuts stayed less expensive, consequently crushing the whole purpose behind Grade 4 to exist
Chemical Composition Difference
Nuts Grade | Carbon % | Manganese % | Chromium % | Molybdenum % |
4 | .40-.50 | .70-.90 | … | .20-.30 |
7 | .37-.49 | .65-1.10 | .75-1.20 | .15-.25 |
Grade Type | Hot Forged or Cold Punched Nuts | Nuts Machined from Bar Stock |
---|---|---|
7 | 7 | 7B |
Grade Identification Marking5 | Specification | Material | Nominal Size, In. | Tempering Temp. °F | Proof Load Stress, ksi | Hardness Rockwell | See Note | |
---|---|---|---|---|---|---|---|---|
Min | Max | |||||||
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ASTM A194 Grade 7 Nuts | Medium Carbon Alloy Steel, Quenched and Tempered | 1/4 - 4 | 1100 | 175 | C24 | C38 | 1,2 |
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ASTM A194 Grade 7M Nuts | Medium Carbon Alloy Steel, Quenched and Tempered | 1/4 - 4 | 1150 | 150 | 159 | 237 | 1,2,3 |





**All measurements in millimeters**
Nominal Size or Basic Major Thread Diameter |
F |
G |
H |
||||||
Width Across Flats |
Width Across Corners |
Thickness |
|||||||
Basic |
Max |
Min |
Max |
Min |
Basic |
Max |
Min |
||
1/4 |
.2500 |
7/16 |
.438 |
.428 |
.505 |
.488 |
7/32 |
.226 |
.212 |
5/16 |
.3125 |
1/2 |
.500 |
.489 |
.577 |
.557 |
17/64 |
.273 |
.258 |
3/8 |
.3750 |
9/16 |
.562 |
.551 |
.650 |
.628 |
21/64 |
.337 |
.479 |
7/16 |
.4375 |
11/16 |
.688 |
.675 |
.794 |
.768 |
3/8 |
.385 |
.365 |
1/2 |
.5000 |
3/4 |
.750 |
.736 |
.866 |
.840 |
7/16 |
.448 |
.427 |
9/16 |
.5625 |
7/8 |
.875 |
.861 |
1.010 |
.982 |
31/64 |
.496 |
.473 |
5/8 |
.6250 |
15/16 |
.938 |
.922 |
1.083 |
1.051 |
35/64 |
.559 |
.535 |
3/4 |
.7500 |
1-1/8 |
1.125 |
1.088 |
1.299 |
1.240 |
41/64 |
.665 |
.617 |
7/8 |
.8750 |
1-5/16 |
1.312 |
1.269 |
1.516 |
1.447 |
3/4 |
.776 |
.724 |
1 |
1.0000 |
1-1/2 |
1.500 |
1.450 |
1.732 |
1.653 |
55/64 |
.887 |
.831 |
1-1/8 |
1.1250 |
1-11/16 |
1.688 |
1.631 |
1.949 |
1.859 |
31/32 |
.999 |
.939 |
1-3/8 |
1.3750 |
2-1/16 |
2.062 |
1.994 |
2.382 |
2.273 |
1-11/64 |
1.206 |
1.138 |
1-1/2 |
1.500 |
2-1/4 |
2.250 |
2.175 |
2.598 |
2.480 |
1-9/32 |
1.ASTM A194 GR. 8 |
1.245 |
1-5/8 |
1.6250 |
2-7/16 |
2.438 |
2.356 |
2.815 |
2.686 |
1-25/64 |
1.429 |
1.353 |
1-3/4 |
1.7500 |
2-5/8 |
2.625 |
2.538 |
3.031 |
2.893 |
1-1/2 |
1.540 |
1.460 |
2 |
2.0000 |
3 |
3.000 |
2.900 |
3.464 |
3.306 |
1-23/32 |
1.763 |
1.675 |
2-1/4 |
2.2500 |
3-3/8 |
3.375 |
3.263 |
3.897 |
3.719 |
1-15/16 |
1.986 |
1.890 |
2-1/2 |
2.5000 |
3-3/4 |
3.750 |
3.625 |
4.330 |
4.133 |
2-5/32 |
2.209 |
2.105 |
2-3/4 |
2.7500 |
4-1/8 |
4.125 |
3.988 |
4.763 |
4.546 |
2-3/8 |
2.431 |
2.319 |
Standards |
Designation |
---|---|
ASTM |
A194 Grade 7: 410 Stainless Steel, Quenched and Tempered.. |
Dimensions |
ASME B18.2.1, B18.3 |
---|---|
Melt Origin |
South America/East Europe/Japan/Korea/ |
Product Origin |
Made in India |
Threads Configuration |
ASME B1.1 2A/3A Inch Unified Threads and B1.13M 6h Metric Coarse Threads |
Certification |
Dual Certified As per ASTM & ASME Codes |
Additional Certifications |
PED 97/23/EC Certified, Merkblatt AD 2000 W2 Certified |
Mandatory Requirements |
Free from Mercury & Radioactive Contamination |
Additional Requirements |
NACE MR0103 / MR0175 / ISO 15156 Compliance |
We Keep Bulk Stock of astm a194 grade 7l nuts at our stockyard, contact us to request a quote
Nut Size (mm) |
Diameter* (mm) |
Height (mm) |
||
---|---|---|---|---|
Hex Nut |
Jam Nut |
Nylock Nut |
||
2 |
4 |
1.6 |
1.2 |
- |
2.5 |
5 |
2 |
1.6 |
- |
3 |
5.5 |
2.4 |
1.8 |
4 |
4 |
7 |
3.2 |
2.2 |
5 |
5 |
8 |
4 |
2.7 |
5 |
6 |
10 |
5 |
3.2 |
6 |
7 |
11 |
5.5 |
3.5 |
- |
8 |
13 |
6.5 |
4 |
8 |
10 |
17 |
8 |
5 |
10 |
12 |
19 |
10 |
6 |
12 |
14 |
22 |
11 |
7 |
14 |
16 |
24 |
13 |
8 |
16 |
18 |
27 |
15 |
9 |
18.5 |
20 |
30 |
16 |
10 |
20 |
* This is the diameter across the flats. It is also the size of wrench to use. |
Best Price & Fast Delivery of A194 Grade 7 Material, check SA 194 Grade 7 Nuts dimensions
ASTM A194 Gr 7 Nylock Insert Nuts |
ASTM A194 Gr 7 Nuts |
ASTM A 194 Coupling Nuts |
ASTM A194 Square Nuts |
ASTM A194 Gr 7 Flange Nuts |
A194 Gr 7 Hex Nuts |
SS Gr.7 Lock Nuts |
SS Gr.7 Heavy Hex Nuts |
Stainless Steel Gr.7 T Nuts |
ASTM A 194 Gr.7 Dome Nuts |
ISO Approved ASTM A194 Eye Nuts |
ASTM A 194 Gr.7 Nuts |
ASTM A 194 Hex Nuts |
A194 Gr 7 T But |
ASTM A194 Gr 7 temperature |
Gr.7 Stainless Steel Washer |
SA194 Nuts |
Stainless Steel Gr.7 Panel Nuts |
ASTM A 194 Gr.7 Heavy Hex Nuts |
ASTM A194 Locking Nuts |
Stainless Steel Gr.7 Wing Nuts |
ASTM A194 Gr 7 Panel Nuts |
ASTM A 194 Gr.7 Lock Nuts |
Gr.7 Panel Nuts |

Nominal Size or Basic Major Thread Diameter |
F |
G |
H |
||||||
Width Across Flats |
Width Across Corners |
Thickness |
|||||||
Basic |
Max |
Min |
Max |
Min |
Basic |
Max |
Min |
||
1/4 |
.2500 |
1/2 |
.500 |
.488 |
.577 |
.556 |
15/64 |
.250 |
.218 |
5/16 |
.3125 |
9/16 |
.562 |
.546 |
.650 |
.622 |
19/64 |
.314 |
.280 |
3/8 |
.3750 |
11/16 |
.688 |
.669 |
.794 |
.763 |
23/64 |
.377 |
.341 |
7/16 |
.4375 |
3/4 |
.750 |
.728 |
.866 |
.830 |
27/64 |
.441 |
.403 |
1/2 |
.5000 |
7/8 |
.875 |
.850 |
1.010 |
.969 |
31/64 |
.504 |
.464 |
9/16 |
.5625 |
15/16 |
.938 |
.909 |
1.083 |
1.037 |
35/64 |
.568 |
.526 |
5/8 |
.6250 |
1-1/16 |
1.062 |
1.031 |
1.227 |
1.175 |
39/64 |
.631 |
.587 |
3/4 |
.7500 |
1-1/4 |
1.250 |
1.212 |
1.443 |
1.382 |
47/64 |
.758 |
.710 |
7/8 |
.8750 |
1-7/16 |
1.438 |
1.394 |
1.660 |
1.589 |
55/64 |
.885 |
.833 |
1 |
1.0000 |
1-5/8 |
1.325 |
1.575 |
1.876 |
1.796 |
63/64 |
1.012 |
.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 |
1.460 |
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 |
2.0000 |
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 |
3.0000 |
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 |
3.670 |
3.616 |
4 |
4.0000 |
6-1/8 |
6.125 |
5.925 |
7.073 |
6.755 |
3-15/16 |
4.014 |
3.862 |
Buy High-Grade Quality from ASTM A194 Gr 7M Nuts Suppliers, view Grade 7 Nuts Specification
Nominal Size, In. | Temperature °F | Proof Load Stress, ksi | Hardness Rockwell | Material |
1/4 - 4 | 1100 | 80 | C38 | Medium Carbon Alloy Steel, Quenched and Tempered |
Grade | Material | UNS Number |
C, % | Mn, % | Ph, % | S, % | Si, % | Cr, % | Ni, % | Mo, % | Ti, % | Cb & Ta, % | N, % | Other Elements, % |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
7 | Type 4140, 4142, 4145, 4140H, 4142H, 4145H | 0.37-0.49 | 0.65-1.10 | 0.035 | 0.040 | 0.15-0.35 | 0.75-1.2 | - | 0.15-0.25 | - | - | - | - |
STANDARD | Type |
Grade 7 and 7M Nuts | Quenched & tempered carbon-molybdenum |
|
|
Specific size are available in SA194 Grade 7M Flat Washer at dealer price in India
Philippines, Indonesia, Dammam -KSA, Belgium | Stainless Steel ASTM A194 Grade 7 Heavy Hex Nuts PTFE / Xylan Nuts |
Europe, France, Qatar, Thailand | ASTM A194 Zinc Plated Carbon Steel Grade 7 Hex Nuts |
Germany, Thailand, Malaysia, Czechia | ASTM A194 Grade 7 Nuts with Washer |
Bangladesh, USA, Malaysia, Finland | A194 Grade 7m Heavy Hex Nuts |
Kuwait, Saudi Arabia (KSA), South Africa, Brazil | Heavy Hex Nuts ASTM A194 Grade 7 Plain Finish |
Singapore, South Africa, Bahrain | ASTM A194 Grade 7l Hot DIP Galvanized Heavy Hexagon Nuts |
UK, Australia, Philippines, Nigeria | Green PTFE Coated A194 Grade 7 Heavy Hex Structural Nuts |
Hong Kong, Malaysia, Oman, UAE | ANSI B18.2.2 A194 Grade 7 Nuts |
Iran, Italy, Chile, Singapore | Heavy Hex Nuts ASTM A194 Grade 7 Mechanical Galvanized |
Norway, Turkey, United Arab Emirates (UAE), Malaysia | A194 7 ANSI 8.8 10.9 Grade Black Oxid and HDG Hex Nuts |
Russia, Malaysia, Netherlands, Dubai | ASTM A194 Grade 7m Heavy Hex Nuts with Black Surface |
Mexico, Spain, Egypt, UK | DIN934, ASTM A194 Carbon Steel Grade 7 Metric A4-80 Heavy Hex Nuts |
Nominal Size, inch | Threads per inch | Stress Area inch | Proof Load, lbf | |
---|---|---|---|---|
Grade 2H, 4, 7, 16 | ||||
Heavy Hex | Hex | |||
1/4" | 20 | 0.0316 | 4770 | 4300 |
5/16" | 18 | 0.0524 | 7860 | 7070 |
3/8" | 16 | 0.0774 | 11620 | 10460 |
7/16" | 14 | 0.1063 | 15940 | 14350 |
1/2" | 13 | 0.1419 | 21280 | 19160 |
9/16" | 12 | 0.1820 | 27300 | 24570 |
5/8" | 11 | 0.2260 | 33900 | 30510 |
3/4" | 10 | 0.3340 | 50100 | 45090 |
7/8" | 9 | 0.4620 | 69300 | 62370 |
1" | 8 | 0.606 | 90900 | 81810 |
1 1/8" | 8 | 0.7900 | 118500 | 106700 |
1 1/4" | 8 | 1.0000 | 150000 | 135000 |
1 3/8" | 8 | 1.2330 | 185000 | 166500 |
1 1/2" | 8 | 1.492 | 223800 | 201400 |
- Positive Material Identification – PMI Testing
- Chemical Analysis – Spectro Analysis
- Pitting Resistance Test
- Intergranular Corrosion (IGC) Test
- Mechanical Testing Such as Tensile, Elongation, Reduction of Area
- Dye Penetrant Test (DP Test)
- Sulfide Stress Corrosion Cracking (SSC), NACE TM 0177
- Hydrogen-Induced Cracking (HIC) Test, NACE TM0284
- Heat Exchangers
- Pharmaceuticals
- Aircraft Exhaust Manifolds
- Petrochemicals
- Spiral Welded tube for burner pipes and flues
- Pharmaceutical Equipment
- Gas Processing
- Off-Shore Oil Drilling Companies
- Specialty Chemicals
- Sea Water Equipment
- Power Generation