ASTM A194 Grades
ASTM A194 Grade 8C Specification
ASTM A194 standard is the specification of Carbon, Alloy Steel Nuts and martensitic and austenitic stainless steel nuts that will be used with bolts in either high-pressure or high-temperature service or both. This standard is broadly applied, with ranges of 4 inches, 1/4 inch, or metric sizes of M6 to M100 nominal, specifically to carbon, alloy and martensitic stainless steel nuts, and austenitic stainless steel nuts are included in the 1/4 inch and M6 nominal size ranges and larger.
ASME SA 194 Gr 8C Nut, ASTM A194 Grade 8C Washer, ASME SA194 Gr 8C Heavy Hex Nuts, ASTM A194 Gr. 8C Hex Nuts, ASTM A194 Gr. 8C Nylock Nuts, ASTM A194 Gr. 8C Flex lock Nuts, ASTM A194 Gr. 8C Square Nut Manufacturer & Supplier in India
ASTM A194 Grade 8C nuts are high-strength alloy steel components that are produced by the ASTM standards. They are made out of a combination of chromium and carbon steel, thereby making them highly durable, corrosion-resistant, and with a higher tensile strength than the normal Grade 8 bolts. This composition renders them to be the best in demanding applications in high temperatures or pressures.
ASTM A194 Grade 8C nuts are popular in the securing of structural elements of a critical nature such as oil refineries, chemical reactors, petrochemical plants, and power plants and in construction (bridges and ships) due to their strong qualities. They are also resistant to corrosion and can be used in sanitary conditions that are exposed to chemicals or corrosive liquids. They are part of a group of fasteners of specialty that contains such types as ASTM A193 B8 CL2 and ASTM A193 B8M fasteners.
Quick Section Links
- ASTM A194 Grade 8C Nuts Specifications
- SA194 Grade 8C Nuts Chemical Composition
- Mechanical Properties of ASTM A194 Grade 8C Nuts
- ASTM A194 Grade 8C Proof Load (Inch Series)
- ASTM A194 Grade 8C Marking
- SA194 Grade 8C Nuts Equivalent Grades
- ASTM A194 8C Nut Size Chart
- ASTM A194 Grade 8C Hex Nuts Dimensions
- ASTM A194 GR 8C Nuts Weight Chart
- ASTM A194 GR. 8C Nuts Inventory
- Available Stock of ASTM A194 GR. 8C Nuts
- Applications of ASTM A194 GR. 8C Nuts
- ASTM A194 Grade 8C Nuts Price
What is the difference between A194 Grade 8C Fasteners and 8M?
The main difference is the composition of the materials and tensile strength. Grade 8C fasteners of A194 have medium carbon alloy steel content and have a significantly high minimum tensile strength of 150 ksi. Conversely, A194 Grade 8M fasteners are fasteners constructed of high-strength stainless steel (Austenitic, the same as 316 grade) and have a tensile strength of a minimum of 125 ksi.
Is Grade 8C Fasteners high tensile?
Yes, Grade 8C fasteners are high-tension products. They are built of carbon steel that has been alloyed to provide strength, which makes them have very high tensile strength that can even be 200 ksi and above. In addition to great strength, these fasteners are also extremely ductile and weldable, which makes them highly appropriate in demanding services, especially in low-temperature services and medium-pressure systems. The natural toughness of Grade 8C enables them to be sure of much pressure without rupturing and causing permanent damage.
ASTM A194 Grade 8C Nuts Specifications
|
Standards
|
Designation
|
|---|---|
|
ASTM
|
A194 Grade 8C: 347 Stainless Steel Heavy Hex Nuts. |
|
Dimensions
|
ASME B18C.2.1, B18C.3
|
|---|---|
|
Melt Origin
|
East Europe/South America/Korea/Japan
|
|
Product Origin
|
Made in India
|
|
Threads Configuration
|
ASME B1.1 2A/3A Inch Unified Threads and B1.13M 8Ch Metric Coarse Threads
|
|
Certification
|
Dual Certified As per ASTM & ASME Codes
|
|
Additional Certifications
|
PED 98C/23/EC Certified, Merkblatt AD 2000 W2 Certified
|
|
Mandatory Requirements
|
Free from Mercury & Radioactive Contamination
|
|
Additional Requirements
|
NACE MR0103 / MR018C5 / ISO 15158C Compliance
|
SA194 Grade 8C Nuts Chemical Composition
| ASTM | C. | Mn. | Si. | P. | S. | Cr. | Ni. | Mo. |
| A194 Grade 8C | 0.08 % | 2.00 % | 1.00 % | 0.05 %. | 0.03 % | 17.0-19.0 % | 9.0-12.0 | — |
Mechanical Properties of ASTM A194 Grade 8C Nuts
| Tensile Strength/Ultimate Tensile Stress (UTS) – (Mpa) | Yield Strength/Proof Stress(0.2% Offset) (YS) – (Mpa) | Elongation in 4D (El) | Reduction | Hardness – (BHN) |
| 550 | 240 | 30 | 40 | 223 |
ASTM A194 Grade 8C Proof Load (Inch Series)
|
Nominal Size, inch
|
Threads per inch
|
Stress Area inch
|
Proof Load, lbf
|
|
|---|---|---|---|---|
|
All Types of Grade 8
|
||||
|
Heavy Hex
|
Hex
|
|||
|
1/4″
|
20
|
0.0316
|
5570
|
4770
|
|
5/16″
|
18
|
0.0524
|
9170
|
7860
|
|
3/8″
|
16
|
0.0774
|
13560
|
11620
|
|
7/16″
|
14
|
0.1063
|
18600
|
15940
|
|
1/2″
|
13
|
0.1419
|
24830
|
21280
|
|
9/16″
|
12
|
0.1820
|
31850
|
27300
|
|
5/8″
|
11
|
0.2260
|
39550
|
33900
|
|
3/4″
|
10
|
0.3340
|
58450
|
50100
|
|
7/8″
|
9
|
0.4620
|
80850
|
69300
|
|
1″
|
8
|
0.606
|
106000
|
90900
|
|
1 1/8″
|
8
|
0.7900
|
138200
|
118500
|
|
1 1/4″
|
8
|
1.0000
|
175000
|
150000
|
|
1 3/8″
|
8
|
1.2330
|
215800
|
185000
|
|
1 1/2″
|
8
|
1.492
|
261100
|
223800
|
ASTM A194 Grade 8C Marking
| Grade Type | Hot Forged or Cold Punched Nuts | Nuts Machined from Bar Stock |
| 8C | 8C | 8CB |
SA194 Grade 8C Nuts Equivalent Grades
|
Grade
|
Material
|
UNS Number
|
|---|---|---|
|
8C
|
Type 347
|
S34700
|
ASTM A194 8C Nut Size Chart
|
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
|
1.8C
|
4
|
|
4
|
8C
|
3.2
|
2.2
|
5
|
|
5
|
8C
|
4
|
2.8C
|
5
|
|
6
|
10
|
5
|
3.2
|
6
|
|
8C
|
11
|
5.5
|
3.5
|
–
|
|
8C
|
13
|
6.5
|
4
|
8C
|
|
10
|
18C
|
8C
|
5
|
10
|
|
12
|
19
|
10
|
6
|
12
|
|
14
|
22
|
11
|
8C
|
14
|
|
16
|
24
|
13
|
8C
|
16
|
|
18C
|
28C
|
15
|
9
|
18C.5
|
|
20
|
30
|
16
|
10
|
20
|
|
* This is the diameter across the flats. It is also the size of wrench to use.
|
||||
ASTM A194 Grade 8C Hex Nuts 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 8C Nuts Weight Chart
| Size | Finished Hex | Heavy Hex | Finished Jam | Heavy Hex Jam | Square | Heavy Square |
| 1/2″ | 3.75 | 6.54 | 2.62 | 4.00 | 5.78 | 7.87 |
| 5/8″ | 7.33 | 11.9 | 4.93 | 6.96 | 10.8 | 14.3 |
| 3/4″ | 11.9 | 19.3 | 7.70 | 11.0 | 15.4 | 23.5 |
| 7/8″ | 19.0 | 29.7 | 12.0 | 16.7 | 24.5 | 36.2 |
| 1″ | 28.3 | 42.5 | 17.6 | 23.5 | 36.3 | 51.5 |
| 11/8″ | 40.3 | 59.2 | 24.7 | 32.4 | 52.5 | 72.4 |
| 11/4″ | 54.3 | 78.6 | 36.1 | 45.8 | 70.6 | 95.5 |
| 13/8″ | 73.0 | 102 | 47.9 | 59.3 | 94.5 | 125.0 |
| 11/2″ | 94.3 | 131 | 60.9 | 74.8 | 122 | 161 |
| 15/8″ | 162 | 91.6 | ||||
| 13/4″ | 151 | 204 | 100 | 114 | ||
| 17/8″ | 241 | 134 | ||||
| 2″ | 224 | 299 | 140 | 165 | ||
| 21/4″ | 419 | 227 | ||||
| 21/2″ | 564 | 332 | ||||
| 23/4″ | 738 | 429 | ||||
| 3″ | 950 | 545 | ||||
| 31/4″ | 1194 | 651 | ||||
| 31/2″ | 1526 | 851 | ||||
| 33/4″ | 1812 | 1005 | ||||
| 4″ | 2180 | 1200 |
ASTM A194 GR. 8C Nuts Inventory
ASTM A194 GR. 8C Hex Nuts
ASTM A194 GR. 8C Lock Nuts
ASTM A194 GR. 8C Wing Nuts
Available Stock of ASTM A194 GR. 8C Nuts
- ASTM A194 GR. 8C Panel Nut
- ASTM A194 8C UNS S34700 Dome Nuts
- ASTM A194 GR. 8C Serrated Flange Nut
- ASTM A194 GR. 8C Hex Nut
- ASTM A194 GR. 8C Nut
- ASTM A194 8C UNS S34700 Serrated Flange Nuts
- ASTM A194 GR. 8C Wing Nut
- ASTM A194 GR. 8C Self Locking Nuts
- ASTM A194 GR. 8C | ASME B18C.2.1 High Nuts
- ASTM A194 GR. 8C Spring T Nuts
- ASTM A194 GR. 8C Hexagone Nuts
- ASME B18C.2.1 ASTM A194 8C Nuts
- ASTM A194 GR. 8C Structural Nuts
- ASTM A194 GR. 8C 2 Way Lock Nut
- ASTM A194 GR. 8C Flex Lock Nut
- ASME SA194 Gr. 8C B18C.3 Nylon Insert Nut
- ASTM A194 GR. 8C Hex Nuts
- ASTM A194 8C UNS S34700 Coupler Nuts
- ASTM A194 8C UNS S34700 Slotted Nut
- ASTM A194 GR. 8C Heavy Hex Nuts
- ASTM A194 GR. 8C Hexagon Nuts
- ASTM A194 8C UNS S34700 Hex Nuts
- ASTM A194 GR. 8C 2 Way Lock Nuts
- ASTM A194 GR. 8C Square Nuts
Applications of ASTM A194 GR. 8C Nuts
- Pipeline Engineering
- Marine Industry
- Chemical Industry
- Oil & gas industry
- Mechanical Engineering
- Plant Engineering
- Petrochemical Industry
- Power Industry
- Aerospace
- Food Processing Industry
ASTM A194 8C Nuts Grades
| Grade | Tensile Class | Raw Material |
|---|---|---|
| B5 | 4-6% Chromium Ferritic Steel | |
| B6 | 13% Chromium Ferritic Steel | |
| B6X | 13% Chromium Ferritic Steel | |
| B7 | Chromium Molybdenum Alloy Steel, Quenched & Tempered | |
| B7M | Chromium Molybdenum Alloy Steel, Quenched & Tempered | |
| B16 | Chromium-molybdenum-vanadium Alloy Steel, Quenched & Tempered | |
| B8 | Class 1 | AISI 304 Stainless Steel, Carbide Solution Treated |
| B8 | Class 2 | AISI 304 Stainless Steel, Carbide Solution Treated and Strain Hardened |
| B8A | AISI 304 Stainless Steel, Carbide solution treated in tde finished condition | |
| B8C | Class 1 | AISI 347 Stainless Steel, Carbide Solution Treated |
| B8C | Class 2 | AISI 347 Stainless Steel, Carbide Solution Treated and Strained Hardened |
| B8CA | AISI 347 Stainless Steel, Carbide Solution Treated in Finished Condition | |
| B8M | Class 1 | AISI 316 Stainless Steel, Carbide Solution Treated |
| B8M | Class 2 | AISI 316 Stainless Steel, Carbide Solution Treated and Strain Hardened |
| B8MA | AISI 316 Stainless Steel, Carbide Solution Treated in Finished Condition | |
| B8M2 | AISI 316 Stainless Steel, Carbide Solution Treated and Strain Hardened | |
| B8M3 | AISI 316 Stainless Steel, Carbide Solution Treated and Strain Hardened | |
| B8P | Class 1 | AISI 305 Stainless Steel, Carbide Solution Treated |
| B8P | Class 2 | AISI 305 Stainless Steel, Carbide Solution Treated and Strain Hardened |
| B8PA | AISI 305 Stainless Steel, Carbide Solution Treated in Finished Condition | |
| B8N | AISI 304N Stainless Steel, Carbide Solution Treated | |
| B8N | AISI 304N Stainless Steel, Carbide Solution Treated and Strain Hardened | |
| B8MLCuN | AISI 304N Stainless Steel, Carbide Solution Treated | |
| B8MLCuN | UNS S31254 Stainless Steel, Carbide Solution Treated and Strain Hardened | |
| B8MLCuNA | UNS S31254 Stainless Steel, Carbide Solution Treated | |
| B8T | Class 1 | AISI 321 Stainless Steel, Carbide Solution Treated |
| B8T | Class 2 | AISI 321 Stainless Steel, Carbide Solution Treated and Strain Hardened |
| B8TA | AISI 321 Stainless Steel, Carbide Solution Treated in Finished Condition | |
| B8R | Nitronic 50/UNS S20910 Stainless Steel, Carbide Solution Treated | |
| B8RA | Nitronic 50/UNS S20910 Stainless Steel, Carbide Solution Treated in Finished Condition | |
| B8S | Nitronic 60/UNS S21800 Stainless Steel, Carbide Solution Treated | |
| B8SA | Nitronic 60/UNS S21800 Stainless Steel, Carbide Solution Treated | |
| B8LN | AISI 304LN Stainless Steel, Carbide Solution Treated | |
| B8LNA | AISI 304LN Stainless Steel, Carbide Solution Treated in Finished Condition | |
| B8MLN | AISI 316LN Stainless Steel, Carbide Solution Treated | |
| B8MLNA | AISI 316LN Stainless Steel, Carbide Solution Treated in Finished Condition | |
| B8CLN | AISI 347LN Stainless Steel, Carbide Solution Treated | |
| B8CLNA | AISI 347LN Stainless Steel, Carbide Solution Treated in Finished Condition |
ASTM A194 Grade 8C Nuts Price
| Product | Price |
|---|---|
| ASTM A194 Grade 8C Socket Head Cap Screw | $5.59 – $258.50 |
| ASTM A194 Grade 8C Plow Bolt, Plain, 5/8-11×2, Gr 5, PK25 | $30.65 / pkg. of 25 |
| ASTM A194 Grade 8C Structural Bolt, 1/2-13×1 1/2L, PK25 | $13.21 / pkg. of 25 |
| ASTM A194 Grade 8C U bolts, with 5/16 Thread, Zinc Finish | $3.71 – $7.25 |
| ASTM A194 Grade 8C Hex Nut, SS, Gr SS304, 3/8-16, Plain, PK50 | $12.13 / pkg. of 50 |
| ASTM A194 Grade 8C Hex Lag Screw, 3/8×2 1/2 In L, PK50 | $19.79 / pkg. of 50 |
| ASTM A194 Grade 8C Flat Washer | $0.09 – $5.97 |
You can now buy SA194 Gr. 8C Heavy Hex Nuts at best prices in India.
We maintain ready stock of Stainless Steel ASTM A194 GR. 8C Self Locking Nut, ASTM A194 GR. 8C Heavy Hex Nuts, ASTM A194 GR. 8C Self Locking Nut, ASTM A194 GR. 8C Lock Nuts, ASTM A194 GR. 8C Hex Nuts. Get in touch with us with your requirement for quick quote.
