12 POINT FLANGE SCREWS
Earnest’s line of Twelve Point Flange Screws are made to the dimensional requirements of the Industrial Fastener Institutes standard IFI-115 (equivalent to SAE standard J58).
The material and physical properties are per ASTM A574:
Material: Alloy Steel
Tensile Strength: 170,000 psi min
Proof Load Strength: 140,000 psi min
Rockwell Hardness: Rc 37/45
The flange diameter and head thickness of the 12 Point Flange Screw are equivalent to the head dimensions of a socket head cap screw. This permits the 12 Point Flange Screw to be a replacement for any application currently using a socket head cap screw. The 12 point design permits this style screw to be tightened down with a 12 point socket wrench which permits higher torques to be applied as compared to a standard internal hex drive socket head cap screw.
The higher strength and larger bearing area under the head of this design provides additional benefits for assemblies over standard hex head cap screws
| Diameter |
Wrench
Size |
Flange Dia. |
Flange
Thickness |
Head
Thickness |
Thread
Length |
| F |
C |
K |
H |
Lt |
| Nom |
Max |
Min |
Max |
Min |
| 1/4 |
1/4 |
.375 |
.058 |
.260 |
1.000 |
| 5/16 |
5/16 |
.469 |
.074 |
.312 |
1.125 |
| 3/8 |
3/8 |
.562 |
.095 |
.375 |
1.250 |
| 7/16 |
7/16 |
.656 |
.109 |
.438 |
1.375 |
| 1/2 |
1/2 |
.750 |
.129 |
.500 |
1.500 |
| 5/8 |
5/8 |
.938 |
.166 |
.625 |
1.750 |
| 3/4 |
3/4 |
1.125 |
.200 |
.750 |
2.000 |
| 7/8 |
7/8 |
1.312 |
.234 |
.875 |
2.250 |
| 1 |
1" |
1.500 |
.268 |
1.000 |
2.500 |