ASTM A193 A320 B8M Full Threaded Stud Bolts
Standard: IFI-136, ASME B16.5, DIN976
Inch Size: 1/4”-4” with various lengths
Metric Size: M6-M100 with various lengths
Other Available Grade:
ASTM A193/A193M B8 Class 1 & 2, B8M Class 1 & 2,
ASTM A320/A320M B8 Class 1 & 2, B8M Class 1 & 2
Finish: Plain, PTFE etc.
Packing: Bulk about 25 kgs each carton, 36 cartons each pallet
Advantage: High Quality and Strict Quality Control, Competitive Price,Timely Delivery; Technical Support, Supply Test Reports
Please feel free to contact us for more details.
ASTM A320
Scope Originally approved in 1948, the ASTM A320 specification covers alloy steel and stainless steel bolting materials for low temperature service. This standard covers rolled, forged, or strain hardened bars, bolts, screws, studs, and stud bolts used for pressure vessels, valves, flanges, and fittings. Like the ASTM A193 specification, unless otherwise specified, the 8UN thread series is specified on fastener larger than 1” in diameter. Below is a basic summary of a few of the common grades within the ASTM A320 specification. A number of other less common grades of ASTM A320 exist, but not covered in the description below.| L7 Alloy steel | AISI 4140/4142 Quenched and tempered |
| L43 Alloy steel | AISI 4340 Quenched and tempered |
| B8 Class 1 Stainless steel | AISI 304, carbide solution treated |
| B8M Class 1 Stainless steel | AISI 316, carbide solution treated |
| B8 Class 2 Stainless steel | AISI 304, carbide solution treated, strain hardened |
| B8M Class 2 Stainless steel | AISI 316, carbide solution treated, strain hardened |
| Grade | Size | Tensile, ksi, min | Yield, ksi, min |
Charpy Impact 20-ft-lbf @ temp |
Elong, %, min | RA, %, min |
| L7 | Up to 21/2 | 125 | 105 | -150° F | 16 | 50 |
| L43 | Up to 4 | 125 | 105 | -150° F | 16 | 50 |
|
B8 Class 1 |
All | 75 | 30 | N/A | 30 | 50 |
|
B8M Class 1 |
All | 75 | 30 | N/A | 30 | 50 |
|
B8 Class 2 |
Up to 3/4 | 125 | 100 | N/A | 12 | 35 |
| 7/8 - 1 | 115 | 80 | N/A | 15 | 35 | |
| 11/8 - 11/4 | 105 | 65 | N/A | 20 | 35 | |
| 13/8 - 11/2 | 100 | 50 | N/A | 28 | 45 | |
|
B8M Class 2 |
Up to 3/4 | 110 | 95 | N/A | 15 | 45 |
| 7/8 - 1 | 100 | 80 | N/A | 20 | 45 | |
| 11/8 - 11/4 | 95 | 65 | N/A | 25 | 45 | |
| 13/8 - 11/2 | 90 | 50 | N/A | 30 | 45 |
| Grade | Nuts | Washers |
| L7 | A194 Grade 4 or 7 | F436 |
| L43 | A194 Grade 4 or 7 | F436 |
| B8 Class 1 | A194 Grade 8 | SS304 |
| B8M Class 1 | A194 Grade 8M | SS316 |
| B8 Class 2 | A194 Grade 8, strain hardened | SS304 |
| B8M Class 2 | A194 Grade 8M, strain hardened | SS316 |
Fasteners, like screws, come with a variety of different head drive shapes. The ones that I want you to be able to identify are; straight/flat, Phillips, square, Allen, Torx, and hex head.
Straight or Flat head – Used to be used a lot in wood working way back but now are used mostly in electrical (wire terminals, face plate covers, etc). When using this type of driver head be sure to use the correct size; if not then you will either strip out the head or the driver. A straight head looks like a minus sign.
Phillips head – This is the most common type of driver head you will find and it looks like a plus sign. When using make sure you have the correct size driver (#1, #2, or #3) or you will easily strip the screw
Square drive – Like the name suggests the driver is in the shape of a square. Some times screws have just a recessed square on the top of the head but other times you can use these drives on “Phillips” heads. Certain screws are combining both the Phillips and square drive so that either can be used.
Torx head – This driver looks like a star with six points. This one is being seen more and more frequently because it has more contact points between the screw and driver than a Phillips head screw.
Allen wrench – This head type is most commonly used on set screws. The shape of this driver is a recessed hexagon. A set screw is most commonly used for holding something in place (wheel on an axle or bit in a counter-sink) or as a depth stop. A set screw can be identified as looking like a tiny bolt with the head cut off. In fact the head is actually the same diameter as the screw’s shank.
Hex head – This is most common on bolts and has a hexagon shape inserted and removed with a wrench or socket.
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