What do the strength grades / classes denote?

The grade or class of a washer denotes its strength & compatibility with the respective nut / threaded rod / screw / bolt. The higher the grade, the higher the strength of the fastener. SAE grades are used for Imperial washers. Washers having the same SAE strength grade as other fasteners should be used together. ISO classes are used for Metric washers. Washers having the same first digit as a fastener are meant to be used together. ASTM grades are based on factors like strength, pressure & temperature.

How to install a tension / load indicator structural washer?

A tension / load indicator structural washer can be installed on a bolt assembly while taking care that the washer does not come in contact with the rotating surface of the attached nut or bolt head. Coming in contact with a rotating part would cause premature compression & wear on the ridges of the washer and render it useless.

Structural Washers

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Structural washers are used with structural screws, bolts, studs & nuts for ensuring the structural integrity of an engineered joint. Raptor Supplies offers structural washers from...Read more

APPROVED VENDOR -

Zinc Plated Steel Structural Washers

Style	Model	Fits Bolt Sizes	Inside Dia.	Thickness Tolerance	Grade	Material	Finish	Price (inc. VAT)	Pkg. Qty.
A	SBW5008000-010P1	M8	9 mm	-1 mm to +1 mm	Non Graded	Steel	Zinc Plated	£14.77	10
A	SBW5010000-010P1	M10	11 mm	-1 mm to +1 mm	Non Graded	Steel	Zinc Plated	£14.95	10
A	SBW5012000-010P1	M12	14 mm	-1.2 mm to +1.2 mm	Non Graded	Steel	Zinc Plated	£15.87	10
A	SBW5016000-010P1	M16	18 mm	-1.2 mm to +1.2 mm	Non Graded	Steel	Zinc Plated	£21.14	10
A	SBW5020000-005P1	M20	22 mm	-1.2 mm to +1.2 mm	Non Graded	Steel	Zinc Plated	£17.19	5
A	SBW5022000-005P1	M22	24 mm	-1.2 mm to +1.2 mm	Non Graded	Steel	Zinc Plated	£28.99	5

APPROVED VENDOR -

Hot Dipped Galvanized Steel Structural Washers

Style	Model	Fits Bolt Sizes	Grade	Inside Dia.	Outside Dia.	Thickness Tolerance	Hardness	Material	Finish	Price (inc. VAT)	Pkg. Qty.
A	FWI5100GUSA-010BX	1"	Non Graded	1 1/16"	2"	0.136" to 0.178"	Rockwell C26-C45	Steel	Hot Dip Galvanized	£9.17	10
A	FWI5050GUSA-050BX	1/2"	Non Graded	17/32"	1 1/16"	0.097" to 0.177"	Rockwell C26-C45	Steel	Hot Dip Galvanized	£12.15	50
A	FWI5075GUSA-025BX	3/4"	Non Graded	13/16"	1 15/32"	0.122" to 0.177"	Rockwell C26-C45	Steel	Hot Dip Galvanized	£11.16	25
A	FWI5062GUSA-050BX	5/8"	Non Graded	0.172"	1 5/16"	0.122" to 0.177"	Rockwell C26-C45	Steel	Hot Dip Galvanized	£19.50	50
B	M04237.120.0001	M12	Grade 2	13 mm	24 mm	-	-	Steel	Hot Dip Galvanized	£121.33	400
B	M04237.160.0001	M16	Grade 2	17 mm	30 mm	-	-	Steel	Hot Dip Galvanized	£124.59	200
B	M04237.200.0001	M20	Grade 2	21 mm	37 mm	-	-	Steel	Hot Dip Galvanized	£168.38	200
B	M04237.220.0001	M22	Grade 2	23 mm	39 mm	-	-	Steel	Hot Dip Galvanized	£235.79	200
B	M04237.240.0001	M24	Grade 2	25 mm	44 mm	-	-	Steel	Hot Dip Galvanized	£395.33	200
B	M04237.270.0001	M27	Grade 2	28 mm	50 mm	-	-	Steel	Hot Dip Galvanized	£191.94	100
B	M04237.300.0001	M30	Grade 2	31 mm	56 mm	-	-	Steel	Hot Dip Galvanized	£394.73	100
B	M04237.360.0001	M36	Grade 2	37 mm	66 mm	-	-	Steel	Hot Dip Galvanized	£420.77	50

GRAINGER -

Black Oxide Steel Structural Washers

Style	Model	Fits Bolt Sizes	Inside Dia.	Outside Dia.	Grade	Material	Finish	Price (inc. VAT)	Pkg. Qty.
A	M04035.120.0001	M12	13 mm	24 mm	Grade 2	Steel	Black Oxide	£599.31	400
A	M04035.160.0001	M16	17 mm	30 mm	Grade 2	Steel	Black Oxide	£117.42	200
A	M04035.200.0001	M20	21 mm	37 mm	Grade 2	Steel	Black Oxide	£184.30	200
A	M04035.220.0001	M22	23 mm	39 mm	Grade 2	Steel	Black Oxide	£298.98	200
A	M04035.240.0001	M24	25 mm	44 mm	Grade 2	Steel	Black Oxide	£257.92	200
A	M04035.270.0001	M27	28 mm	50 mm	Grade 2	Steel	Black Oxide	£229.77	100

GRAINGER -

Structural Flat Washer, Std, 1 1/4 In Fits Bolt Size, 1 3/8 In I.D., Not Gr.

Model	Item	Price (inc. VAT)	Pkg. Qty.
FWI5125GUSA-010BX	CQ7EWH	£13.83	10

GRAINGER -

Structural Flat Washer, Std, 7/8 In Fits Bolt Size, 15/16 In I.D., Not Gr.

Model	Item	Price (inc. VAT)	Pkg. Qty.
FWI5087GUSA-025BX	CQ7EWJ	£16.30	25

GRAINGER -

Square Beveled Washer, For Leveling, 1/2 In Fits Bolt Size, 1/2 In I.D.

Model	Item	Price (inc. VAT)	Pkg. Qty.
076534-4	CR3GJX	£100.90	300

GRAINGER -

Structural Flat Washer, Std, 1 1/8 In Fits Bolt Size, 1 3/16 In I.D., Not Gr.

Model	Item	Price (inc. VAT)	Pkg. Qty.
FWI5112GUSA-010BX	CQ7EWG	£11.65	10