L43 grade specification of ASTM A320 includes fasteners perfect for lower temperatures. These are composed of stainless or alloy steel, and cover hardened, rolled, forged bars, studs, bolts, and screws.
Below we have mentioned the grades that fall under A320
A320 Grade L43
| L43 |
AISI 4340 Quenched and tempered |
Mechanical properties
| Grade |
Size |
Tensile ksi, min |
Yield ksi, min |
Elong %, min |
RA % min |
HBW |
Rockwell |
| L43 |
Up to 4 |
125 |
105 |
16 |
50 |
321 Max |
35 max |
Chemical properties
| Element |
L43 (AISI 4340) |
| Carbon |
0.38 - 0.48% |
| Manganese |
0.75 - 1.00% |
| Phosphorus, max |
0.035% |
| Sulfur, max |
0.040% |
| Silicon |
0.15 - 0.35% |
| Chromium |
0.70 - 1.10% |
| Nickel |
1.65 - 2.00% |
| Molybdenum |
0.20 - 0.30% |
Related hardware
| Bolt Grade |
Nut |
Washers |
| L43 |
A194 Grade 4 or 7 |
F436 |
