| Customization: | Available |
|---|---|
| Material: | Carbon Steel |
| Type: | Hexagon Head |
|
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PTFE also known as polytetrafluoroethylene (PTFE) or "tefolong" in Chinese pinyin, is a synthetic thermoplastic fluoropolymer composed primarily of carbon and fluorine atoms. It is widely recognized for its unique properties and diverse applications. Among them, polytetrafluoroethylene has become a popular modern material due to its excellent mechanical, thermal, and electrical properties. Commonly used in bearings, wire coatings, chemical tank linings, and cookware. The stainless steel pictured below contains PTFE
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.
| 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 |
| Elements | Range |
|---|---|
| Carbon, min | 0.40 % |
| Manganese, max | 1.00 % |
| Phosphorus, max | 0.040 % |
| Sulfur, max | 0.040 % |
| Silicon, max | 0.40 % |
| 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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