ASTM F436 Teflon®-Coated Hardened Flat Washers
ASTM F436 Teflon®-coated hardened flat washers are designed for high-strength bolting applications where reduced friction, corrosion resistance, and consistent torque are required. RAM Threading supplies F436 hardened flat washers with PTFE coating to improve installation performance and extend service life in demanding industrial environments.
F436
Per ASTM F436/F436M-16
Per ASTM F436/F436M-16
| Rockwell Hardness | |
|---|---|
| Plain Finish | Hot Dip Galvanized |
| 38–45 HRC | 26–45 HRC |
F436
Per ASTM F436/F436M-16
Per ASTM F436/F436M-16
| Grade | Material | Phosphorus % by weight |
Sulfur % by weight |
|---|---|---|---|
| F325 Type 1 | Carbon Steel | 0.040 | 0.050 |
| ASTM F436/F436M | Covers the chemical, mechanical, and dimensional requirements for hardened steel washers for use with fasteners having nominal thread diameters of 1⁄4 through 4 in. and M12 through M100. |
| Nominal Diameter | UNC | UN8 | F Width Across Flats |
G Width Across Corners |
H Thickness |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Basic | Max | Min | Max | Min | Basic | Max | Min | ||||||
| Fraction | Decimal | ||||||||||||
| 1/4 | 0.250 | 20 | 1/2 | 0.500 | 0.488 | 0.577 | 0.556 | 15/64 | 0.250 | 0.218 | |||
| 5/16 | 0.313 | 18 | 9/16 | 0.562 | 0.546 | 0.650 | 0.220 | 19/64 | 0.314 | 0.280 | |||
| 3/8 | 0.375 | 16 | 11/16 | 0.688 | 0.669 | 0.794 | 0.763 | 23/64 | 0.377 | 0.341 | |||
| 7/16 | 0.438 | 14 | 3/4 | 0.750 | 0.728 | 0.866 | 0.830 | 27/64 | 0.441 | 0.403 | |||
| 1/2 | 0.500 | 13 | 7/8 | 0.875 | 0.850 | 1.010 | 0.990 | 31/64 | 0.504 | 0.464 | |||
| 9/16 | 0.563 | 12 | 15/16 | 0.938 | 0.909 | 1.083 | 1.037 | 35/64 | 0.568 | 0.526 | |||
| 5/8 | 0.625 | 11 | 1 1/16 | 1.062 | 1.031 | 1.227 | 1.175 | 39/64 | 0.631 | 0.587 | |||
| 3/4 | 0.750 | 10 | 1 1/4 | 0.250 | 1.212 | 1.443 | 1.382 | 47/64 | 0.758 | 0.710 | |||
| 7/8 | 0.875 | 9 | 1 7/16 | 1.438 | 1.394 | 1.660 | 1.589 | 55/64 | 0.885 | 0.833 | |||
| 1 | 1.000 | 8 | 1 5/8 | 1.625 | 1.575 | 1.876 | 1.796 | 63/64 | 1.012 | 0.956 | |||
| 1 1/8 | 1.125 | 7 | 8 | 1 13/16 | 1.812 | 1.756 | 2.093 | 2.002 | 1 7/64 | 1.139 | 1.079 | ||
| 1 1/4 | 1.250 | 7 | 8 | 2 | 2.000 | 1.380 | 2.309 | 2.209 | 1 7/32 | 1.251 | 1.187 | ||
| 1 3/8 | 1.375 | 6 | 8 | 2 3/16 | 2.188 | 2.119 | 2.526 | 2.416 | 1 11/32 | 1.378 | 1.310 | ||
| 1 1/2 | 1.500 | 6 | 8 | 2 3/8 | 2.375 | 2.300 | 2.742 | 2.622 | 1 15/32 | 1.505 | 1.433 | ||
| 1 5/8 | 1.625 | 5 1/2 | 8 | 2 9/16 | 2.562 | 2.481 | 2.959 | 2.828 | 1 19/32 | 1.632 | 1.556 | ||
| 1 3/4 | 1.750 | 5 | 8 | 2 3/4 | 2.750 | 2.662 | 3.175 | 3.035 | 1 23/32 | 1.759 | 1.679 | ||
| 1 7/8 | 1.875 | 5 | 8 | 2 15/16 | 2.938 | 2.844 | 3.392 | 3.242 | 1 27/32 | 1.886 | 1.802 | ||
| 2 | 2.000 | 4 1/2 | 8 | 3 1/8 | 3.125 | 3.025 | 3.608 | 3.449 | 1 31/32 | 2.013 | 1.925 | ||
| 2 1/4 | 2.250 | 4 1/2 | 8 | 3 1/2 | 3.500 | 3.388 | 4.041 | 3.862 | 2 13/64 | 2.251 | 2.155 | ||
| 2 1/2 | 2.500 | 4 | 8 | 3 7/8 | 3.875 | 3.750 | 4.474 | 4.275 | 2 29/64 | 2.505 | 2.401 | ||
| 2 3/4 | 2.750 | 4 | 8 | 4 1/4 | 4.250 | 4.112 | 4.907 | 4.688 | 2 45/64 | 2.759 | 2.647 | ||
| 3 | 3.000 | 4 | 8 | 4 5/8 | 4.625 | 4.475 | 5.340 | 5.102 | 2 61/64 | 3.013 | 2.893 | ||
| 3 1/4 | 3.250 | 4 | 8 | 5 | 5.000 | 4.838 | 5.774 | 5.515 | 3 3/16 | 3.252 | 3.124 | ||
| 3 1/2 | 3.500 | 4 | 8 | 5 3/8 | 5.375 | 5.200 | 6.207 | 5.928 | 3 7/16 | 3.506 | 3.370 | ||
| 3 3/4 | 3.750 | 4 | 8 | 5 3/4 | 5.750 | 5.562 | 5.562 | 6.341 | 3 11/16 | 3.670 | 3.616 | ||
| 4 | 4.000 | 4 | 8 | 6 1/8 | 6.125 | 5.925 | 5.925 | 6.755 | 3 15/16 | 4.014 | 3.862 | ||