F436 Flat Washer, Teflon
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F436 Flat Washer, Teflon

ASTM F436 thru hardened structural flat washers are used under bolt heads or nuts to increase the bearing surface area, or to offer protection so that the nut or bolt can be rotated without distortion of the bearing surface. They are designed for general purpose and structural use with bolts, nuts, studs, and other internally and externally threaded fasteners. Dimensional specifications are governed by ASTM F436. Dimensionally comparable to the low carbon SAE Washer, but manufactured from a higher grade of steel and heat treated. F436 washers are suitable for use with many fastener grades including B7, B16, L7, and A325 and A490 structural bolts. Also used with fasteners covered in A354 and A449. PTFE coating (commonly referred to as Teflon) is formulated with superior characteristics for maximum fastener life. Technical components include a tensile strength of up to 4,000 psi and an operating pressure up to 100,000 psi. The absence of nut locking oxides enable easy and safe removal. PTFE coatings have extreme chemical resistance and are ideal for applications including insulating piping, boiler rooms, water filled piping, water lines and more.

Governing StandardsF436

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.

Mechanical PropertiesF436

Thru Hardened Steel Per ASTM F436/F436M-16
Rockwell Hardness
Plain   Finish Hot Dip Galvanized
38-45 HRC 26-45 HRC

Chemical PropertiesF436

Per ASTM F436/F436M-16
Grade Material Phosphorus Sulfur
% by weight % by weight
F325 Type 1 Carbon Steel 0.040 0.050

Dimensional SpecificationsF436

F436 thru hardened flat washer dimensions
Per ASTM F436/F436M-16
Size Nominal A B C
Inside
Diameter
Outside
Diameter
Thickness Thickness
Min Max
1/2 0.5000 0.5310 1.0630 0.0970 0.1770
5/8 0.6250 0.6880 1.3130 0.1220 0.1770
3/4 0.7500 0.8130 1.4680 0.1220 0.1770
7/8 0.8750 0.9380 1.7500 0.1360 0.1770
1 1.0000 1.0630 2.0000 0.1360 0.1770
1 1/8 1.1250 1.1880 2.2500 0.1360 0.1770
1 1/4 1.2500 1.3750 2.5000 0.1360 0.1770
1 3/8 1.3750 1.5000 2.7500 0.1360 0.1770
1 1/2 1.5000 1.6250 3.0000 0.1360 0.1770
1 5/8 1.6250 1.7700 3.2500 0.1780 0.2800
1 3/4 1.7500 1.8750 3.3750 0.1780 0.2800
1 7/8 1.8750 2.0000 3.5000 0.1780 0.2800
2 2.0000 2.1250 3.7500 0.1780 0.2800
2 1/4 2.2500 2.3750 4.0000 0.2400 0.3400
2 1/2 2.5000 2.6250 4.5000 0.2400 0.3400
2 3/4 2.7500 2.8750 5.0000 0.2400 0.3400
3 3.0000 3.1250 5.5000 0.2400 0.3400
  1. All dimensions are in inches.
F436 Flat Washer, Teflon
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Diameter Inside Diameter Outside Diameter Thickness Item # Availability Price Quantity UOM
1/2 0.5310 1.0630 0.1770 W436050T-I In Stock $0.35431/EA EA
5/8 0.6880 1.3130 0.1770 W436062T-I In Stock $0.50155/EA EA
3/4 0.8130 1.4680 0.1770 W436075T-I In Stock $0.65435/EA EA
7/8 0.9380 1.75 0.1770 W436087T-I In Stock $0.89097/EA EA
1 1.0630 2.0 0.1770 W436100T-I In Stock $1.0906/EA EA
1 1/8 1.1880 2.25 0.1770 W436112T-I In Stock $1.43737/EA EA
1 1/4 1.3750 2.5 0.1770 W436125T-I In Stock $2.62301/EA EA
1 3/8 1.5 2.75 0.1770 W436137T-I In Stock $2.09693/EA EA
1 1/2 1.6250 3.0 0.1770 W436150T-I In Stock $6.38724/EA EA
1 5/8 1.77 3.25 0.28 W436162T-I In Stock $3.41143/EA EA
1 3/4 1.8750 3.3750 0.28 W436175T-I In Stock $3.83296/EA EA
2 2.1250 3.75 0.28 W436200T-I In Stock $5.67026/EA EA