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F436/F436M Washer

F436/F436M Washers, F436/F436M Flat Washers, Hardened Washers & F436/F436M Washer Manufacturer and Supplier in Mumbai, India

Unifit Metal Alloys is a manufacturer, supplier, stockist and exporter of F436/F436M Washers in Mumbai, India, supplying hardened steel washers for structural bolting, heavy-duty fastening and industrial construction applications. These washers are used beneath nuts and bolt heads to distribute the applied load over a larger surface area, helping protect connected materials and supporting the stability of bolted joints.

F436/F436M Washers are manufactured as hardened washers intended for use with high-strength structural fasteners. Their hardened construction enables them to withstand substantial clamping forces without excessive deformation during tightening. The washers are available in different dimensions to accommodate various bolt sizes and structural fastening requirements.

F436/F436M Washers, F436/F436M Flat Washers, Hardened Washers & F436/F436M Washer Bolting Manufacturer and Supplier in Mumbai, India

These washers are widely used in steel structures, bridges, building frameworks, industrial equipment, oil and gas facilities, petrochemical plants, power-generation projects and heavy engineering applications. They are particularly useful in connections where high-strength bolting systems require a durable washer capable of handling concentrated loads and maintaining proper contact between the fastening components.

F436/F436M Washers are available in different sizes, shapes, material options and finishes to suit specific application requirements. They can be supplied for structural assemblies, fabrication work, equipment installation and other heavy-duty fastening applications where hardened washers are required for reliable load distribution and secure joint performance.

Get the Best Quote for F436/F436M Washers. We Stock F436/F436M Washers in Various Diameters, Sizes, Specifications and Surface Finishes. Contact Us Today for a Competitive Quote.

F436/F436M Washer Specification

Material Hardened Steel
Standard ASTM F436 / F436M
Current Edition ASTM F436/F436M-24
Washer Type Type 1 – Carbon Steel / Type 3 – Weathering Steel
Washer Styles Circular, Beveled, Clipped and Extra Thick
Inch Size Range 1/4″ to 4″
Metric Size Range M12 to M100
Manufacturing Process Stamped, Pressed, Machined and Hardened
Heat Treatment Through Hardened or Carburized, depending on size and manufacturing requirements
Hardness 38–45 HRC for through-hardened washers
Finish Plain, Hot-Dip Galvanized, Mechanically Galvanized and Custom Coatings
Corrosion Resistance Type 3 provides enhanced atmospheric corrosion resistance and weathering characteristics
Application Structural Steel Connections, Bridges, Towers, Construction, Heavy Engineering, Bolted Joints, Flanges and General Mechanical Applications
Compatible Fasteners Bolts, Nuts, Studs and Other Internally and Externally Threaded Fasteners

Chemical Composition for F436/F436M Washer

Element ASTM F436/F436M Type 1 (%)
Carbon (C) 0.30 – 0.50
Manganese (Mn) 0.60 – 1.00
Phosphorus (P) 0.040 max.
Sulfur (S) 0.050 max.
Silicon (Si) 0.15 – 0.35
Chromium (Cr) 0.50 – 1.00
Nickel (Ni) 0.25 max.
Molybdenum (Mo) 0.20 – 0.30
Vanadium (V) 0.02 – 0.10
Copper (Cu) 0.20 – 0.40

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Dimensions of F436/F436M Washer

Dimensions
Bolt Size
USS
SAE
OD (in.)
ID (in.)
Thickness
OD (in.)
ID (in.)
Thickness
1/8 (#6)
–
–
–
0.375
0.156
.036/.065
5/32 (#8)
–
–
–
0.438
0.188
.036/.065
3/16 (#10)
0.560
0.250
.036/.065
0.500
0.220
.036/.065
7/32 (#12)
–
–
–
0.562
0.250
.051/.080
1/4 (#14)
0.734
0.312
.051/.080
0.625
0.281
.051/.080
5/16
0.875
0.375
.064/.104
0.688
0.344
.051/.080
3/8
1.000
0.438
.064/.104
0.812
0.406
.051/.080
7/16
1.250
0.500
.064/.104
0.922
0.469
.051/.080
1/2
1.375
0.562
.086/.132
1.062
0.531
.074/.121
9/16
1.469
0.625
.086/.132
1.156
0.594
.074/.121
5/8
1.750
0.688
.108/.160
1.312
0.656
.074/.121
3/4
2.000
0.812
.122/.177
1.469
0.812
.108/.160
7/8
2.250
0.938
.136/.192
1.750
0.938
.108/.160
1
2.500
1.062
.136/.192
2.000
1.062
.108/.160
1 1/8
2.750
1.250
.136/.192
2.250
1.250
.108/.160
1 1/4
3.000
1.375
.136/.192
2.500
1.375
.136/.192
1 3/8
3.250
1.500
.153/.213
2.750
1.500
.136/.213
1 1/2
3.500
1.625
.153/.213
3.000
1.625
.153/.213
1 5/8
3.750
1.750
.153/.213
–
–
–
1 3/4
4.000
1.875
.153/.213
–
–
–
1 7/8
4.250
2.000
.153/.213
–
–
–
2
4.500
2.125
.153/.213
–
–
–
2 1/4
4.750
2.375
.320/.248
–
–
–
2 1/2
5.000
2.625
.210/.280
–
–
–
2 3/4
5.250
2.875
.228/.410S
–
–
–
3
5.500
3.125
.249/.327
–
–
–

Ready Stock of F436/F436M Washer

F436/F436M Hardened Washers
F436/F436M Flat Washers
F436/F436M Structural Washers
F436/F436M Heavy-Duty Washers
F436/F436M Hardened Steel Washers
F436/F436M Type 1 Washers
F436/F436M Type 3 Washers
F436/F436M Structural Flat Washers
F436/F436M Hardened Structural Washers
F436/F436M High-Strength Washers
Carbon Steel F436/F436M Washers
Weathering Steel F436/F436M Washers

F436/F436M Washer Application Industries

Refineries
90%
Oil and Gas Industry
96%
Power Generation
80%
Pharmaceutical Equipment
85%
Pulp & Paper Industry
88%

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