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System of Measurement System of Measurement |
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Head Type Head Type |
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Threading Threading |
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 | Fully Threaded |
 | Partially Threaded |
Color Color |
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 | White |
Maximum Temperature Maximum Temperature |
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Drive Style Drive Style |
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Thread Direction Thread Direction |
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Tensile Strength Tensile Strength |
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Hardness Hardness |
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Minimum Temperature Minimum Temperature |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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About Hex Head Screws and Bolts
More
Stainless Steel Hex Screw and Nut Kits for Pipe Flanges
Use these kits to connect standard-size stainless steel pipe flanges for ANSI Class 150 or 300. They meet ASTM specifications for material quality, and the dimensions meet ASME specifications. Length of screws is measured from under the head.
316 stainless steel kits are more corrosion resistant than 18-8 stainless steel and have excellent resistance to chemicals and salt water. They may be mildly magnetic. Some kits have blue PTFE-coated nuts. This coating is slippery, chemical-resistant, and prevents galling. It also helps nuts thread smoothly.
For technical drawings and 3-D models, click on a part number.
Screw | Nut | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For Pipe Size | Lg. | Min. Thread Lg. | Head Wd. | Head Ht. | Tensile Strength, psi | Specifications Met | Wd. | Ht. | Specifications Met | For Max. Pressure | Each | |
316 Stainless Steel with Blue-PTFE-Coated Nuts for Class 150 Stainless Steel Flanges | ||||||||||||
5/8"-11 | ||||||||||||
| 3 | 3" | 1 1/2" | 15/16" | 13/32" | 80,000 | ASME B18.2.1, ASTM F593 | 15/16" | 35/64" | ASME B18.2.2, ASTM F594 | 270 psi @ 72° F | 000000000 | 000000 |
| 4 | 3" | 1 1/2" | 15/16" | 13/32" | 80,000 | ASME B18.2.1, ASTM F593 | 15/16" | 35/64" | ASME B18.2.2, ASTM F594 | 270 psi @ 72° F | 000000000 | 00000 |
3/4"-10 | ||||||||||||
| 6 | 3 1/4" | 1 3/4" | 1 1/8" | 15/32" | 80,000 | ASME B18.2.1, ASTM F593 | 1 1/8" | 41/64" | ASME B18.2.2, ASTM F594 | 270 psi @ 72° F | 000000000 | 00000 |
| 8 | 3 1/2" | 1 3/4" | 1 1/8" | 15/32" | 80,000 | ASME B18.2.1, ASTM F593 | 1 1/8" | 41/64" | ASME B18.2.2, ASTM F594 | 270 psi @ 72° F | 000000000 | 00000 |
7/8"-9 | ||||||||||||
| 12 | 4" | 2" | 1 5/16" | 35/64" | 80,000 | ASME B18.2.1, ASTM F593 | 1 5/16" | 3/4" | ASME B18.2.2, ASTM F594 | 270 psi @ 72° F | 000000000 | 000000 |
Plastic Hex Head Screws
Plastic screws are chemical and oil resistant, nonconductive, and lightweight. Not recommended for high-strength fastening. Length is measured from under the head.
PTFE are our most corrosion-resistant plastic screws. They withstand salt water and acids, won't absorb moisture, and perform better than other plastic screws in extreme temperatures.
Match the thread spacing of mating components. Coarse threads are the industry standard; choose these screws if you don’t know the pitch or threads per inch. Fine threads are closely spaced to prevent loosening from vibration.
For technical drawings and 3-D models, click on a part number.
Head | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Thread Spacing | Wd. | Ht. | Color | Temperature Range, °F | Tensile Strength | Each | |
PTFE Plastic | |||||||||
6-32 | |||||||||
| 1/4" | Fully Threaded | Coarse | 1/4" | 3/32" | White | -100° to 500° | Not Rated | 000000000 | 00000 |
| 3/8" | Fully Threaded | Coarse | 1/4" | 3/32" | White | -100° to 500° | Not Rated | 000000000 | 0000 |
| 1/2" | Fully Threaded | Coarse | 1/4" | 3/32" | White | -100° to 500° | Not Rated | 000000000 | 0000 |
| 3/4" | Fully Threaded | Coarse | 1/4" | 3/32" | White | -100° to 500° | Not Rated | 000000000 | 0000 |
| 1" | Fully Threaded | Coarse | 1/4" | 3/32" | White | -100° to 500° | Not Rated | 000000000 | 0000 |
8-32 | |||||||||
| 1/4" | Fully Threaded | Coarse | 1/4" | 7/64" | White | -100° to 500° | Not Rated | 000000000 | 0000 |
| 3/8" | Fully Threaded | Coarse | 1/4" | 7/64" | White | -100° to 500° | Not Rated | 000000000 | 0000 |
| 1/2" | Fully Threaded | Coarse | 1/4" | 7/64" | White | -100° to 500° | Not Rated | 000000000 | 0000 |
| 3/4" | Fully Threaded | Coarse | 1/4" | 7/64" | White | -100° to 500° | Not Rated | 000000000 | 0000 |
10-32 | |||||||||
| 1/4" | Fully Threaded | Fine | 5/16" | 1/8" | White | -100° to 500° | Not Rated | 000000000 | 0000 |
| 3/8" | Fully Threaded | Fine | 5/16" | 1/8" | White | -100° to 500° | Not Rated | 000000000 | 0000 |
| 1/2" | Fully Threaded | Fine | 5/16" | 1/8" | White | -100° to 500° | Not Rated | 000000000 | 0000 |
| 3/4" | Fully Threaded | Fine | 5/16" | 1/8" | White | -100° to 500° | Not Rated | 000000000 | 0000 |
| 1" | Fully Threaded | Fine | 5/16" | 1/8" | White | -100° to 500° | Not Rated | 000000000 | 0000 |
1/4"-20 | |||||||||
| 1/2" | Fully Threaded | Coarse | 7/16" | 3/16" | White | -100° to 500° | Not Rated | 000000000 | 0000 |
| 3/4" | Fully Threaded | Coarse | 3/8" | 3/16" | White | -100° to 500° | Not Rated | 000000000 | 0000 |
| 3/4" | Fully Threaded | Coarse | 7/16" | 3/16" | White | -100° to 500° | Not Rated | 000000000 | 0000 |
| 1" | Fully Threaded | Coarse | 3/8" | 3/16" | White | -100° to 500° | Not Rated | 000000000 | 0000 |
| 1" | Fully Threaded | Coarse | 7/16" | 3/16" | White | -100° to 500° | Not Rated | 000000000 | 0000 |
5/16"-18 | |||||||||
| 3/4" | Fully Threaded | Coarse | 1/2" | 15/64" | White | -100° to 500° | Not Rated | 000000000 | 0000 |
| 1" | Fully Threaded | Coarse | 1/2" | 15/64" | White | -100° to 500° | Not Rated | 000000000 | 0000 |
| 1 1/2" | Fully Threaded | Coarse | 1/2" | 15/64" | White | -100° to 500° | Not Rated | 000000000 | 0000 |
3/8"-16 | |||||||||
| 1" | Fully Threaded | Coarse | 9/16" | 17/64" | White | -100° to 500° | Not Rated | 000000000 | 0000 |
| 1 1/2" | Fully Threaded | Coarse | 9/16" | 17/64" | White | -100° to 500° | Not Rated | 000000000 | 0000 |
| 2" | Fully Threaded | Coarse | 9/16" | 17/64" | White | -100° to 500° | Not Rated | 000000000 | 00000 |
| 2 1/2" | Fully Threaded | Coarse | 9/16" | 17/64" | White | -100° to 500° | Not Rated | 000000000 | 00000 |