ASTM A193/A193M B7 Combination Studs Step Down Studs
Alloy steel bolting for pressure vessels, valves, flanges, and fittings for high temperature or high pressure service, or other special purpose applications.
Standard: According to drawing
Inch Size: 1/4”-4” with various lengths
Metric Size: M6-M100 with various lengths
Other Available Grade:
ASTM A193/A193M B7, B7M, B16 B8 Class 1 & 2, B8M Class 1 & 2,
ASTM A320/A320M L7, L7M, L43, B8 Class 1 & 2, B8M Class 1 & 2, and so on.
Finish: Plain, Black Oxide, Zinc Plated, Zinc Nickel Plated, Cadmium Plated, 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 A193
Scope
Originally approved in 1936, this specification is heavily utilized in petroleum and chemical construction applications. The ASTM standard covers alloy steel and stainless steel bolting materials for high temperature service. This specification includes fasteners intended for use in pressure vessels, valves, flanges, and fittings. Although, this material is often available in national coarse (UNC) thread pitches, if being used in traditional applications, threads are specified 8 threads per inch (tpi) for diameters above one inch.
Below is a basic summary of a few of the common grades. ASTM A193 covers a number of other standard specifications not covered in this description including B5, B6, and B16.
Grades
| B7 | Alloy steel, AISI 4140/4142 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 |
Mechanical Properties
| Grade | Size | Tensile ksi, min | Yield, ksi, min | Elong, %, min | RA % min |
| B7 | Up to 2-1/2 | 125 | 105 | 16 | 50 |
| 2-5/8 - 4 | 115 | 95 | 16 | 50 | |
| 4-1/8 - 7 | 100 | 75 | 18 | 50 | |
| B8 Class 1 | All | 75 | 30 | 30 | 50 |
| B8M Class 1 | All | 75 | 30 | 30 | 50 |
| B8 Class 2 | Up to 3/4 | 125 | 100 | 12 | 35 |
| 7/8 - 1 | 115 | 80 | 15 | 35 | |
| 1-1/8 - 1-1/4 | 105 | 65 | 20 | 35 | |
| 1-3/8 - 1-1/2 | 100 | 50 | 28 | 45 | |
| B8M Class 2 | Up to 3/4 | 110 | 95 | 15 | 45 |
| 7/8 - 1 | 100 | 80 | 20 | 45 | |
| 1-1/8 - 1-1/4 | 95 | 65 | 25 | 45 | |
| 1-3/8 - 1-1/2 | 90 | 50 | 30 | 45 |
Recommended Nuts and Washers
| Bolt Grade | Nuts | Washers |
| B7 | A194 Grade 2H | F436 |
| B8 Class 1 | A194 Grade 8 | SS304 |
| B8M Class 1 | A194 Grade 8M | SS316 |
| B8 Class 2 | A194 Grade 8 | SS304 |
| B8M Class 2 | A194 Grade 8M | SS316 |
Strain hardened nuts available as a supplementary requirement
Learn How to Build Your Own Tower Clock. Its simple and easy and will look great in your Home! More information go to:
https://clockparts.com/
Want to Talk to an Expert: 888-827-2387
Building Your Own Tower Clock is a Great Do It Yourself Project! We offer you all the parts so that you can enjoy and benefit from a Large Wall Clock in your home.
Building your tower clock starts with marking the positions of the “numbers” or “indicators” you are going to use on the wall before you start installing our Mounting Cup Kit.
An 11” by 17 inch paper number template is included to assist you. Just tape it to the wall where you want the Clock Movement installed.
Typically, I use a 3 foot yard stick with a pencil to then mark the actual “number” or “indicator” positions on the wall. I also use a nail with a string attached to make a “circle” in pencil on the wall. It’s usually easy to erase later. Mark your “number” positions before continuing.
Mount the 4 inch vinyl Arabic or Roman numbers you have to your smooth, clean wall. Just remove the paper backing, then press the numbers on, smoothing out as you go, from bottom to top. Be patient, this is the slowest part of the assembly process.
The Wall Mounting Bracket is attached directly to your wall using the larger coarse screws through the 2 oblong screws slots. Drywall anchors are included for modern drywall or Sheet Rock walls. You can view the wall mounting bracket by visiting https://www.clockparts.com/plastic-mounting-cups/
Just align properly and pre-drill a slightly smaller hole in the drywall. Then gently tap the plastic anchor into your wall.
If you are mounting to a plaster wall, then pre-drill a small hold into the plaster. Be sure to hit the wood lathe in the plaster for a good fit.
The back of the Wall Mounting Bracket is flat, so you could also use a good double faced tape to mount the bracket to your wall without screws. Adhesives are another possibility.
Once the wall Mounting Bracket is installed, it’s time to install your Clock Movement into the Movement Holder. Place the rubber washer over the hand shaft and insert through the hole in the center of the movement holder.
Slide the brass washer over the hand shaft and thread on the brass hex nut. Do not over tighten. Hand tight plus a ¼ of a turn works very well. That’s it for the clock movement. Now install the clock hands as indicated with your movement choice. Install a fresh alkaline battery.
Time to install the Movement Holder to the Wall Mounting Bracket. Align the two small round holes in the Wall Mounting Bracket with those on the Movement Holder. Press together and install the small screws through the mounting holes in the Movement Holder and Wall Mounting Bracket.
You’re almost done. Let’s get the hands properly set. Move both the minute and hour hands to the 12:00 position. It’s OK to “pinch” them together so that they are properly aligned at 12:00. Touching just the tip of the minute hand, turn to the present time.
Now you’re done. Call us at 888-827-2387 with any questions, we will be glad to assist.
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