How do countersunk washers provide better protection against vibrations than flat washers?

When installed, these countersunk washers push against the object for resisting vibrations. They essentially act as springs. Driving a threaded fastener through the centre will force the washer's sides to collapse, thus pushing against the object.

What are finishing countersunk washers?

Finishing countersunk washers are also known as dress washers. These washers are machined to be sturdier and provide a better appearance than standard countersunk washers. Oval and flat head screws sit flush within these countersunk washers.

What are countersunk external-tooth lock washers?

These washers feature teeth that firmly grip heads of 82-degree flat head countersunk screws, preventing joints from loosening due to vibration.

What is the significance of countersunk tight-grip external-tooth lock washers?

The teeth on these washers bite deeper into the screw head & joint than normal external-tooth lock washers. They provide a solid hold, preventing 90-degree countersunk screws from loosening due to vibrations.

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Countersunk Washers

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Countersunk washers are used with oval and flat head screws to provide a bearing surface and sealing functionality. Raptor Supplies offers a wide range of countersunk washers from brands...Read more

APPROVED VENDOR -

Plain Grade 18-8 Stainless Steel Countersunk Washers

Style	Model	For Screw Size	Overall Height	Outside Dia.	Countersink Angle	Height Tolerance	Hardness	Color	Tensile Strength	Price	Pkg. Qty.
A	U51350.013.0001	#6	0.078"	29/64"	82°	+0.043"	Rockwell B70	Silver	-	€10.96	100
B	U51350.016.0001	#8	0.094"	33/64"	82°	+0.038"	Rockwell B70	Silver	-	€10.89	100
C	Z9931SS	#8	1/8"	1"	82°	-0.01" to +0.01"	Rockwell B85-B95	-	90000 psi	€19.44	1
D	Z9930SS	#8	1/8"	3/4"	82°	-0.01" to +0.01"	Rockwell B85-B95	-	90000 psi	€14.13	1
E	Z9933SS	#10	0.14"	1 1/8"	82°	-0.01" to +0.01"	Rockwell B85-B95	-	90000 psi	€37.00	1
F	Z9932SS	#10	0.14"	13/16"	82°	-0.01" to +0.01"	Rockwell B85-B95	-	90000 psi	€22.44	1
G	Z9934SS	#10	0.14"	1 1/4"	82°	-0.01" to +0.01"	Rockwell B85-B95	-	90000 psi	€30.76	1
H	U51350.019.0001	#10	0.109"	19/32"	82°	+0.05"	Rockwell B70	Silver	-	€14.13	100
I	U51350.021.0001	#12	0.265"	11/16"	82°	-0.139"	Rockwell B70	Silver	-	€18.55	100
J	Z9939SS	1/4"	0.281"	2"	82°	-0.01" to +0.01"	Rockwell B85-B95	-	90000 psi	€113.07	1
K	U51350.025.0001	1/4"	0.156"	25/32"	82°	-0.005" to +0.014"	Rockwell B70	Silver	-	€23.01	100
L	Z9935SS	1/4"	0.281"	1 1/4"	82°	-0.01" to +0.01"	Rockwell B85-B95	-	90000 psi	€35.53	1
M	Z9936SS	1/4"	0.281"	1 3/8"	82°	-0.01" to +0.01"	Rockwell B85-B95	-	90000 psi	€50.39	1
N	Z9937SS	1/4"	0.281"	1 1/2"	82°	-0.01" to +0.01"	Rockwell B85-B95	-	90000 psi	€49.17	1
O	Z9938SS	1/4"	0.281"	1 3/4"	82°	-0.01" to +0.01"	Rockwell B85-B95	-	90000 psi	€71.52	1
P	FINWX00300-010P1	M3	1.8 mm	10 mm	90°	-	-	-	-	€16.34	10
P	FINWX00400-010P1	M4	2.3 mm	14 mm	90°	-	-	-	-	€21.25	10
P	FINWX00500-005P1	M5	2.8 mm	16 mm	90°	-	-	-	-	€31.37	5
P	FINWX00600-005P1	M6	3.3 mm	18 mm	90°	-	-	-	-	€14.84	5

MICRO PLASTICS -

Plain Grade 6/6 Nylon Countersunk Washers

Style	Model	For Screw Size	Overall Height	Outside Dia.	Color	Countersink Angle	Height Tolerance	Temp. Range	Price	Pkg. Qty.
A	11SFW0006B	#6	0.1"	7/16"	Black	82°	-0.005" to +0.005"	-40°F	€9.50	20
B	11SFW0008B	#8	0.115"	33/64"	Black	82°	-0.005" to +0.005"	-40°F	€25.35	20
C	11SFW0008	#8	0.115"	33/64"	Off White	82°	-0.005" to +0.005"	-40°F	€8.55	20
D	11SFW0010	#10	0.152"	37/64"	Off White	82°	-0.005" to +0.005"	-40°F	€10.06	20
E	11SFW0012	#12	4/25"	39/64"	Off White	82°	-0.005" to +0.005"	-40°F	€26.30	20

APPROVED VENDOR -

Black Oxide Steel Countersunk Washers

Style	Model	For Screw Size	Overall Height	Outside Dia.	Countersink Angle	Height Tolerance	Hardness	Color	Price	Pkg. Qty.
A	Z9931	#8	1/8"	1"	82°	-0.01" to +0.01"	Rockwell C40	Black	€41.88	5
A	Z9930	#8	1/8"	3/4"	82°	-0.01" to +0.01"	Rockwell C40	Black	€33.66	5
A	Z9933	#10	0.14"	1 1/8"	82°	-0.01" to +0.01"	Rockwell C40	Black	€12.74	1
A	Z9932	#10	0.14"	13/16"	82°	-0.01" to +0.01"	Rockwell C40	Black	€48.88	5
A	Z9934	#10	0.14"	1 1/4"	82°	-0.01" to +0.01"	Rockwell C40	Black	€14.13	1
A	Z9938	1/4"	0.281"	1 3/4"	82°	-0.01" to +0.01"	Rockwell C40	Black	€22.27	1
A	Z9937	1/4"	0.281"	1 1/2"	82°	-0.01" to +0.01"	Rockwell C40	Black	€16.84	1
A	Z9936	1/4"	0.281"	1 3/8"	82°	-0.01" to +0.01"	Rockwell C40	Black	€16.40	1
A	Z9935	1/4"	0.281"	1 1/4"	82°	-0.01" to +0.01"	Rockwell C40	Black	€15.05	1
A	Z9939	1/4"	0.281"	2"	82°	-0.01" to +0.01"	Rockwell C40	Black	€46.17	1
A	Z9921	M4	3 mm	20 mm	90°	-0.3 mm to +0.3 mm	Rockwell C40	Black	€31.61	5
A	Z9920	M4	3 mm	16 mm	90°	-0.3 mm to +0.3 mm	Rockwell C40	Black	€30.96	5
A	Z9924	M5	3.5 mm	28 mm	90°	-0.3 mm to +0.3 mm	Rockwell C40	Black	€11.09	1
A	Z9923	M5	3.5 mm	25 mm	90°	-0.3 mm to +0.3 mm	Rockwell C40	Black	€58.27	5
A	Z9922	M5	3.5 mm	22 mm	90°	-0.3 mm to +0.3 mm	Rockwell C40	Black	€43.12	5
A	Z9927	M6	5 mm	40 mm	90°	-0.3 mm to +0.3 mm	Rockwell C40	Black	€20.63	1
A	Z9928	M6	6 mm	45 mm	90°	-0.3 mm to +0.3 mm	Rockwell C40	Black	€24.16	1
A	Z9929	M6	6 mm	52 mm	90°	-0.3 mm to +0.3 mm	Rockwell C40	Black	€35.71	1
A	Z9926	M6	4 mm	36 mm	90°	-0.3 mm to +0.3 mm	Rockwell C40	Black	€18.16	1
A	Z9925	M6	4 mm	32 mm	90°	-0.3 mm to +0.3 mm	Rockwell C40	Black	€17.41	1

GRAINGER -

Plain Grade 316 Stainless Steel Countersunk Washers

Style	Model	For Screw Size	Outside Dia.	Overall Height	Countersink Angle	Height Tolerance	Hardness	Color	Tensile Strength	Price
A	ZPYR#10625-316	#10	5/8"	1/8"	82°	-0.01" to +0.01"	Rockwell B85-B95	Silver	75000 psi	€14.13
B	ZPYR14750-316	1/4"	3/4"	1/8"	82°	-0.01" to +0.01"	Rockwell B85-B95	Silver	75000 psi	€15.05

APPROVED VENDOR -

Countersunk Washer, 8 For Screw Size, Steel, 17/32 In O.D., 0.109 In Overall Ht.

Model	Item	Price (ex. VAT)
FINWIS0-85-100P	AB9HNJ	€7.10

RIDGID -

Washer, Counter Sunk

Model	Item	Price (ex. VAT)
47073	BL9DQJ	€14.81	RFQ