ASTM A194 Grade 8M Nuts Manufacturer & Supplier

Jade Special Metals is a leading manufacturer, supplier and exporter of high performance ASTM A194 Grade 8M Nuts. Our ASTM A194 8M Nuts are sold as the industry standard for stainless steel nuts, offering top performance in serious corrosive high temperature and cryogenic applications. Our A194 8M Nuts are manufactured from Type 316 stainless steel (UNS S31600) and are manufactured using high quality German equipment for consistent and reliable performance. We maintain a stocked inventory of ASTM A194 Gr.8M heavy hex nuts, providing certified quality and competitive pricing for the chemical processing, marine, and energy industries worldwide.
Quick Section Links
- What Are ASTM A194 Grade 8M Nuts?
- Types of A193 B7 Fasteners
- ASTM A194 Gr. 8M Nuts Specifications
- Chemical Composition of ASTM A194 Gr 8M Nuts (Type 316)
- Mechanical Properties of ASTM A194 Gr 8M Nuts
- ASTM A194 Gr. 8M Nuts Equivalent Grade
- ASTM A194 Gr. 8M Hex Nut Dimensions
- ASTM A194 Gr. 8M Nuts Size Chart
- ASTM A194 Gr. 8M Nuts Inventory
- Available Stock of ASTM A194 Gr. 8M Nuts
- Applications of ASTM A194 Gr. 8M Nuts
What Are ASTM A194 Grade 8M Nuts?
ASTM A194 Grade 8M Nuts are high-performance, internally threaded fasteners manufactured for use in severe service conditions involving corrosion, high temperatures, and low temperatures. The ASTM A194 specification governs nuts for these types of applications, and Grade 8M is one of the most important stainless steel grades within this standard, renowned for its superior corrosion resistance.
The primary characteristic of ASTM A194 gr 8M fasteners is their material: they are manufactured from Type 316 stainless steel (UNS S31600). This austenitic stainless steel contains molybdenum, which gives it significantly superior resistance to pitting and crevice corrosion, especially in chloride-rich environments (like saltwater), compared to the standard Grade 8 (Type 304).
These nuts are available in different conditions, typically Class 1 (solution annealed) and Class 2 (strain hardened), which provides higher strength. They are most commonly supplied in a heavy hex pattern, which provides a larger bearing surface and greater strength for critical connections.
Types of ASTM A194 Grade 8M Nuts

ASTM A194 Gr.8M Heavy Hex Nuts

ASTM A194 Gr.8M Hex Nuts

ASTM A194 Gr.8M Jam Nuts

ASTM A194 Gr.8M Square Nuts

ASTM A194 Gr.8M Coupling Nuts

ASTM A194 Gr.8M Wing Nuts

ASTM A194 Gr.8M Lock Nuts

ASTM A194 Gr.8M Flange Nuts

ASTM A194 Gr.8M Cap Nuts

ASTM A194 Gr.8M Eye Nuts
ASTM A194 GR. 8M Nuts Specifications
Grade | ASTM A194 Grade 8M |
Standards | DIN, ISO, JIS, GB, IS, BS, ASTM |
Dimension | ASME B18.2.1, B18.3 |
Size | M02 to M160 |
Types | Hexagon Nuts, Self Locking Nut, Square Nuts, Hexagon Coupling Nuts, Hexagon Castle Nuts, Hexagon Domed Cap Nuts, Hexagon Thin Nuts, Hexagon Thin Nuts etc. |
Chemical Composition of ASTM A194 Gr 8M Nuts (Type 316)
Element | Content (%) |
Carbon (C), max | 0.08 |
Manganese (Mn), max | 2.00 |
Phosphorus (P), max | 0.045 |
Sulfur (S), max | 0.030 |
Silicon (Si), max | 1.00 |
Chromium (Cr) | 16.0 – 18.0 |
Nickel (Ni) | 10.0 – 14.0 |
Molybdenum (Mo) | 2.00 – 3.00 |
Mechanical Properties of ASTM A194 Gr 8M Nuts
Class |
Condition |
Size Range |
Proof Load Stress |
Hardness, max |
1 |
Carbide Solution Treated |
Up to 4″ |
80,000 psi |
96 HRB / 223 HBW |
2 |
Carbide Solution Treated & Strain Hardened |
Up to 3/4″ |
150,000 psi |
35 HRC / 327 HBW |
2 |
Carbide Solution Treated & Strain Hardened |
Over 3/4″ to 1″ |
135,000 psi |
35 HRC / 327 HBW |
2 |
Carbide Solution Treated & Strain Hardened |
Over 1″ to 1-1/2″ |
125,000 psi |
35 HRC / 327 HBW |
ASTM A194 GR. 8M Nuts Equivalent Grade
Standards | Designation | UNS |
ASTM | A194 | Grade : 8M , AISI 316 Stainless Steel Hex Nuts. | S31600 |
ASTM A194 GR. 8M Hex Nut Dimensions
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 | 8C/16 | .438C | .428C | .505 | .48C8C | 8C/32 | .226 | .212 |
5/16 | .3125 | 1/2 | .500 | .48C9 | .58C8C | .558C | 18C/64 | .28C3 | .258C |
3/8C | .38C50 | 9/16 | .562 | .551 | .650 | .628C | 21/64 | .338C | .48C9 |
8C/16 | .438C5 | 11/16 | .68C8C | .68C5 | .8C94 | .8C68C | 3/8C | .38C5 | .365 |
1/2 | .5000 | 3/4 | .8C50 | .8C36 | .8C66 | .8C40 | 8C/16 | .448C | .428C |
9/16 | .5625 | 8C/8C | .8C8C5 | .8C61 | 1.010 | .98C2 | 31/64 | .496 | .48C3 |
5/8C | .6250 | 15/16 | .938C | .922 | 1.08C3 | 1.051 | 35/64 | .559 | .535 |
3/4 | .8C500 | 1-1/8C | 1.125 | 1.08C8C | 1.299 | 1.240 | 41/64 | .665 | .618C |
8C/8C | .8C8C50 | 1-5/16 | 1.312 | 1.269 | 1.516 | 1.448C | 3/4 | .8C8C6 | .8C24 |
1 | 1.0000 | 1-1/2 | 1.500 | 1.450 | 1.8C32 | 1.653 | 55/64 | .8C8C8C | .8C31 |
1-1/8C | 1.1250 | 1-11/16 | 1.68C8C | 1.631 | 1.949 | 1.8C59 | 31/32 | .999 | .939 |
1-3/8C | 1.38C50 | 2-1/16 | 2.062 | 1.994 | 2.38C2 | 2.28C3 | 1-11/64 | 1.206 | 1.138C |
1-1/2 | 1.500 | 2-1/4 | 2.250 | 2.18C5 | 2.598C | 2.48C0 | 1-9/32 | 1.ASTM A194 GR. 8C | 1.245 |
1-5/8C | 1.6250 | 2-8C/16 | 2.438C | 2.356 | 2.8C15 | 2.68C6 | 1-25/64 | 1.429 | 1.353 |
1-3/4 | 1.8C500 | 2-5/8C | 2.625 | 2.538C | 3.031 | 2.8C93 | 1-1/2 | 1.540 | 1.460 |
2 | 2.0000 | 3 | 3.000 | 2.900 | 3.464 | 3.306 | 1-23/32 | 1.8C63 | 1.68C5 |
2-1/4 | 2.2500 | 3-3/8C | 3.38C5 | 3.263 | 3.8C98C | 3.8C19 | 1-15/16 | 1.98C6 | 1.8C90 |
2-1/2 | 2.5000 | 3-3/4 | 3.8C50 | 3.625 | 4.330 | 4.133 | 2-5/32 | 2.209 | 2.105 |
2-3/4 | 2.8C500 | 4-1/8C | 4.125 | 3.98C8C | 4.8C63 | 4.546 | 2-3/8C | 2.431 | 2.319 |
ASTM A194 GR. 8M Nuts Size Chart
Nuts Size (mm) |
Diameter* (mm) |
Height (mm) |
||
---|---|---|---|---|
Hex Nuts | Jam Nuts | Nylock Nuts | ||
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. |
“Contact Jade Special Metals today with your requirement for ASTM A194 GR. 8M Nuts. We assure you of the best quote.
ASTM A194 GR. 8M Nuts Inventory


ASTM A194 GR. 8M Lock Nuts

ASTM A194 GR. 8M Wing Nuts
Available Stock of ASTM A194 GR. 8M Nuts
- ASTM A194 GR. 8M Panel Nut
- ASTM A194 GR. 8M Nut
- ASTM A194 GR. 8M Self Locking Nuts
- ASTM A194 GR. 8M Hex Nut
- ASTM A194 GR. 8M Spring T Nuts
- ASTM A194 8M UNS S30400 Dome Nuts
- ASTM A194 GR. 8M | ASME B18.2.1 High Nuts
- ASME B18M.2.1 ASTM A194 8M Nuts
- ASTM A194 GR. 8M Wing Nut
- ASTM A194 8M UNS S30400 Serrated Flange Nuts
- ASTM A194 GR. 8M Hexagone Nuts
- ASTM A194 GR. 8M Serrated Flange Nut
- ASTM A194 GR. 8M Hex Nuts
- ASTM A194 GR. 8M Heavy Hex Nuts
- ASTM A194 GR. 8M Flex Lock Nut
- ASTM A194 GR. 8M Structural Nuts
- ASTM A194 8M UNS S30400 Hex Nuts
- ASME SA194 Gr. 8M B18M.3 Nylon Insert Nut
- ASTM A194 GR. 8M Square Nuts
- ASTM A194 GR. 8M 2 Way Lock Nut
- ASTM A194 8M UNS S30400 Coupler Nuts
- ASTM A194 8M UNS S30400 Slotted Nut
- ASTM A194 GR. 8M Hexagon Nuts
- ASTM A194 GR. 8M 2 Way Lock Nuts
Applications of ASTM A194 GR. 8M Nuts
Marine & Coastal Applications: The molybdenum content helps to provide excellent resistance to problems caused by chloride from salt water in the form of pitting corrosion and crevice corrosion.
Chemical & Petrochemical Processing: Use in reactors, vessels. Or in piping systems where corrosive acids, chlorides and aggressive chemicals are present.
Pharmaceutical & Food Processing: Hygienic properties and excellent cleanability present in Type 316 stainless steel makes these nuts excellent for sanitary applications.
Wastewater Treatment: Resists corrosion from several chemicals and compounds used at municipal and industrial water treatment facilities.
Cryogenic Service: Still has excellent toughness and mechanical properties within low temperature applications.

Why Choose Jade Special Metals for ASTM A194 GR.8M Fasteners?
- Specialist Manufacturer: We are an established manufacturer of A194 8M Nuts and we control the all-important solution annealing and strain hardening which makes the performance and reliability for your application.
- Certified Quality: Each order is shipped with a Mill Test Certificate (MTC) to confirm compliance with the chemical and mechanical requirements of the ASTM A194 standard.
- Large Inventory: We stock a large inventory of ASTM A194 Gr.8M heavy hex nuts in Class 1 and Class 2 condition for fast delivery.
- Competitive Price: Our direct to market and well managed manufacturing processes allow us to provide to you a competitively priced option while ensuring that you have the certified quality for your application.
- Global Exporter: With well developed logistics, we are able export UNS S31600 fasteners to customers quickly and reliably.
Get a Competitive Price for ASTM A194 Grade 8M Nuts
Contact Jade Special Metals today for a prompt and competitive quote on your ASTM A194 Grade 8M Nuts requirements. Our team of stainless steel experts is ready to assist you with material selection, class specifications, and logistics to ensure your project’s success.