ASTM A307 Grade A Hex Bolts Hex Cap Screws
Standard: ASME B18.2.1
(Various types of configuration are also available)
Thread Size: 1/4”-4” with various lengths
Grade: ASTM A307 Grade A
Finish: Black Oxide, Zinc Plated, Hot Dip Galvanized, Dacromet, and so on
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 A307
The ASTM A307 specification covers carbon steel bolts and studs ranging from 1/4″ through 4″ diameter. This is your everyday, run of the mill bolt specification often manufactured using A36 round bar. There are three grades A, B, and C* which denote tensile strength, configuration, and application. Refer to the Mechanical Properties Chart for the subtle strength differences within each grade.
| A | Headed bolts, threaded rods and bent bolts intended for general applications. |
|---|---|
| B | Heavy hex bolts and studs intended for flanged joints in piping systems with cast iron flanges. |
| C* | Nonheaded anchor bolts, either bent or straight, intended for structural anchorage purposes. The end of a grade C anchor bolt intended to project from the concrete will be painted green for identification purposes. Permanent marking is a supplemental requirement. *As of August 2007, grade C has been replaced by specification F1554 grade 36. We will continue to supply grade C, if required by the project. |
| Grade | Tensile, ksi | Yield, min, ksi | Elong %, min |
|---|---|---|---|
| A | 60 min | -- | 18 |
| B | 60 - 100 | -- | 18 |
| C* | 58 - 80 | 36 | 23 |
| Element | Grade A | Grade B |
|---|---|---|
| Carbon, max | 0.29% | 0.29% |
| Manganese, max | 1.20% | 1.20% |
| Phosphorus, max | 0.04% | 0.04% |
| Sulfur, max | 0.15% | 0.05% |
| Nuts | Washers | ||
|---|---|---|---|
| A307 Grades A & C* | A307 Grade B | ||
| 1/4 - 1-1/2 | 1-5/8 - 4 | 1/4 - 4 | |
| A563A Hex | A563A Heavy Hex | A563A Heavy Hex | F844 |
This video was originally uploaded to help a customer who had over adjusted his indexing to the point it was no longer working, I thought I would add it to my channel because it may be helpful to other Scorpion owners who are having indexing issues.
This is a quick video to show you how to adjust the magazine on the BSA Scorpion and the very early Mark 1 R-10s that index when the trigger is pulled. If your magazine is not indexing properly after taking a shot and pulling the trigger ALL the way back then your indexing may need adjustment.
Notes:
- make sure the rifle is not loaded and does not have a magazine/pellets in it,
- take the action out of the stock,
- turn the action upside down so that you are looking at the trigger mechanism rather than the scope rail,
- use a small spanner (7mm or an adjustable) to loosen off the lock nut (shiny nut on the black threaded grubscrew that pushes the indexing pin in the mag slot),
- use an Allen key to loosen off the black threaded grub screw half a turn,
- while the Allen key is still in the grubscrew tighten the lock nut back up,
- fit a mag in the rifle and see if it cycles and indexes properly,
- keep adjusting it until it is working the way you like it,
- make sure the locknut is tight so that the grub screw does not move during use,
- fit the action back in the stock,
- go shooting!
Please carry out any repairs and adjustments at your own risk, If you are unsure and do not have the correct tools then it is best to take your rifle to a gunsmith or send it to me.
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Shanghai Jian & Mei Industry and Trade Co., Ltd. is the company which manufacture and export fasteners and metal hardware, founded in 2006, with import-export authority. Now, 80% products export to all over the world and 20% sell in domestic market.