ASTM A574
A574 is a ASTM International specification for steel socket head cap screws. A574 covers quenched and tempered alloy steel hexagon socket-head cap screws, 0.060 through 4" in diameter where high strength is required.
ASTM A574
A574 is a ASTM International specification for steel socket head cap screws.
A574 covers quenched and tempered alloy steel hexagon socket-head cap screws, 0.060 through 4" in diameter where high strength is required.
A574 MECHANICAL PROPERTIES: FULL SIZE SCREWS |
||
|---|---|---|
| Property | Less than, or equal to, 0.500" dia. | Greater than 0.500" dia. |
| Tensile or Wedge tensile strength, ksi min | 180 | 170 |
| Proof Load (stress), ksi | 140 | 135 |
| Rockwell (HRC) | 39 - 45 | 37 - 45 |
A574 MECHANICAL PROPERTIES: MACHINED TEST SPECIMEN |
||
|---|---|---|
| Property | Less than, or equal to, 0.500" dia. | Greater than 0.500" dia. |
| Yield strength at 0.2% offset, ksi min | 153 | 153 |
| Tensile Strength, ksi min | 180 | 170 |
| Elongation in 5D, min | 10% | 10% |
| Reduction of Area, min | 35% | 35% |
A574 - CHEMICAL PROPERTIES |
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|---|---|---|
| Element | Heat Analysis | Product Analysis |
| Carbon, min | 0.33% | |
| Phosphorous, max | 0.035% | 0.040% |
| Sulfur, max | 0.040% | 0.045% |
NOTE:
One or more of the following alloying elements: chromium, nickel, molybdenum, or vanadium shall be present in sufficient quantity to ensure that the specified strength properties are met after oil quenching and tempering. As a guide for selecting material, an alloy steel should be capable of meeting the specified requirements if the "as oil quenched" core hardness one diameter from the point is equal to or exceeds 25 HRC + (55 x carbon content).