ASTM A320 L7 A193 B7 Dual Certified Heavy Hex Bolts
Standard: ASME/ANSI B18.2.1, ASME/ANSI B18.2.3.7M Various types of head are also available
Inch Size: 1/2”-2.3/4” with various lengths
Metric Size: 1/2-M72 with various lengths
Grade: ASTM A320 L7, ASTM A193 B7
Finish: Black Oxide, Zinc Plated, Zinc Nickel 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 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 |
Nuts + Bolts Season 1 Episode 1 Watch Nuts + Bolts; 1×1 Full Episode .▻ https://fullepisode-tv.gq/tv/72703-1-1 Watch Nuts + Bolts s1e1 Full Episode .
Watch the full episode: https://www.youtube.com/watch?v=zMd56BJAxUU
Plumbing and heating expert Richard Trethewey installs a new flush valve. (See below for shopping list, tools, and steps.)
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Shopping List for How to Repair a Noisy Toilet:
- Replacement flush valve
Tools List for How to Repair a Noisy Toilet:
- Pliers, for loosening and tightening hex nuts
- Slotted screwdriver and open-end wrench, for removing the tank bolts
- Large sponge or cotton cloth, for sopping up water
Steps for How to Repair a Noisy Toilet:
1. Close the shutoff valve behind the toilet to stop the flow of water.
2. Remove the lid from the toilet tank. Flush the toilet and hold down the flush lever to drain as much water from the tank as possible.
3. Use a large sponge or cotton cloth to sop up the remaining water from inside the tank.
4. Disconnect the water-supply line from the underside of the toilet tank.
5. Use a slotted screwdriver and open-end wrench to remove the two bolts that hold the toilet tank to the bowl.
6. Lift the tank off the bowl and use pliers to remove the large nut on the underside of the tank. Remove the old flush valve from the tank.
7. Install a new flush valve to the tank; securely tighten the mounting nut with pliers.
8. Attach two new brass bolts to the tank.
9. Place the rubber spud gasket onto the bottom of the flush valve, then set the tank onto the toilet bowl.
10. Put washers and hex nuts onto the brass bolts, then alternately tighten the nuts to secure the tank to the bowl. Be careful not to overtighten the nuts or you’ll crack the toilet.
11. Reconnect the water-supply line to the underside of the tank.
12. Adjust the flapper chain to the correct length.
13. Turn the water back on and flush the toilet to ensure it’s operating properly and quietly. Adjust the flapper and overflow tube, if necessary.
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