Hex Flange Nuts - GRADE 8
Earnest Machine Products line of hex flange nuts are made to the dimensional requirements of the Industrial Fastener Institute standard IFI-145 for Hex Flange Nuts. This free spinning nut incorporates a large bearing face to eliminate the need for a washer.
The material and physical properties are per the requirements of SAE J995 for Grade 8 Hex Flange Nuts
Chemical Composition Requirements
| Carbon (C) |
Manganese (Mn) |
Phosphorus (P) |
Sulfur (S) |
| Max |
Min |
Max |
Max |
| 0.55 |
0.30 |
0.04 |
0.05 |
Hardness
| Nominal Nut Size |
Rockwell Hardness |
| 1/4 thru 5/8 |
Rc 24 – 32 |
| Over 5/8 thru 1 |
Rc 26 – 34 |
| Over 1” |
Rc 26 – 36 |
Proof Load Strength: 150,000 psi min
| Size |
Width Across Flats |
Width Across Corners |
Flange Diameter |
Nut
Thickness |
Wrench Height |
Flange Thick |
Runout |
| F |
G |
B |
H |
J |
K |
J |
| Max |
Min |
Max |
Min |
Max |
Min |
Max |
Min |
Min |
Min |
Max |
| 1/4 (.250) |
.438 |
.428 |
.505 |
.488 |
.594 |
.574 |
.236 |
.222 |
.14 |
.04 |
.020 |
| 5/16 (.312) |
.500 |
.489 |
.577 |
.557 |
.680 |
.660 |
.283 |
.268 |
.17 |
.04 |
.023 |
| 3/8 (.375) |
.562 |
.551 |
.650 |
.628 |
.750 |
.728 |
.347 |
.330 |
.23 |
.04 |
.025 |
| 7/16 |
.688 |
.675 |
.794 |
.768 |
.937 |
.910 |
.395 |
.375 |
.26 |
.04 |
.032 |
| 1/2 (.500) |
.750 |
.736 |
.866 |
.840 |
1.031 |
1.000 |
.458 |
.437 |
.31 |
.05 |
.035 |
| 9/16 (.562) |
.875 |
.861 |
1.010 |
.982 |
1.188 |
1.155 |
.506 |
.483 |
.35 |
.05 |
.040 |
| 5/8 (.625) |
.938 |
.922 |
1.083 |
1.051 |
1.281 |
1.248 |
.569 |
.545 |
.40 |
.05 |
.044 |
| 3/4 (.750) |
1.125 |
1.088 |
1.299 |
1.240 |
1.500 |
1.460 |
.675 |
.627 |
.46 |
.06 |
.051 |