What is the difference between flat washers and lock washers?

Flat washers are ideal for increasing surface area and distributing the applied force when tightening a fastener. They can be used on the fastener's bolt & nut sides, or used as spacers when using a bolt may not be appropriate. Lock washers produce tension during tightening to control the loosening of nuts. They are commonly used on the fastener's nut side for applications involving vibrations.

How to install a flat washer?

Place the flat washer between the threaded fastener (like a nut) and the screw / bolt head. Make sure that the washer presses against the fastener & other adjacent surfaces to form a tight connection. Press the fastener down to lock the grooves of a serrated washer with the grooves of the nut. Use a wrench or ratchet to tighten the nut / threaded fastener. Ensure that the teeth of a serrated washer are covered completely by the nut / fastener head, or that a split washer is slightly out of alignment. This indicates tension on the threaded fastener. Users may loosen the nut / threaded fastener to adjust the washer if it is not operating correctly.

How to remove a flat washer?

Simply remove the nut / threaded fastener that is holding the washer in place using a vice-grip or pipe wrench.Use a flat screwdriver to pry a lock washer off. When removing a split washer, the screwdriver head should be placed inside the split or beneath the washer and pushed. When removing a washer having teeth, the screwdriver head should be placed under a tooth and pushed up, repeating the procedure with more teeth if required. For other flat washer types, the screwdriver head can be placed below the washer and pushed up. The washer may break during removal, depending on the amount of pressure being applied.If the flat washer does not budge, use penetrating oil and repeat the previous step.Some flat washers can be used multiple times easily. Other washers (split lock) can be used only 1 or 2 times. Users should not reuse a split flat washer or other damaged washers. Do not use old washers in high-stress joint applications.

Flat Washers

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Flat washers are used with threaded fasteners for distributing the load uniformly and reducing frictional losses during screw tightening. These units are used for providing spacing and...Read more

GRAINGER -

18-8 Stainless Steel Fender Washer

Style	Model	Fits Bolt Sizes	Grade	Inside Dia.	Outside Dia.	Thickness	Price (ex. VAT)
A	U55530.019.0002	#10	316	3/16"	11/16"	0.047"	€46.26
B	U55530.050.0300	1/2"	316	1/2"	3"	0.065"	€55.41
C	U51530.050.0125	1/2"	18-8	1/2"	1.25"	0.065"	€6.83
D	U55530.050.0250	1/2"	316	1/2"	2.5"	0.065"	€42.31
E	U55530.050.0175	1/2"	316	1/2"	1.75"	0.065"	€22.16
F	U55530.050.0125	1/2"	316	1/2"	1.25"	0.065"	€11.07
G	U51530.050.0300	1/2"	18-8	1/2"	3"	0.065"	€34.80
H	U51530.050.0250	1/2"	18-8	1/2"	2.5"	0.065"	€40.70
I	U51530.050.0175	1/2"	18-8	1/2"	1.75"	0.065"	€17.05
J	U55530.025.0300	1/4"	316	1/4"	3"	0.065"	€112.70
K	U51530.025.0250	1/4"	18-8	9/32"	2.5"	0.065"	€49.24
L	U55530.025.0250	1/4"	316	1/4"	2.5"	0.065"	€101.07
M	U51530.025.0175	1/4"	18-8	9/32"	1 49/64"	0.065"	€42.38
N	U55530.025.0175	1/4"	316	1/4"	1.75"	0.065"	€42.60
O	U51530.025.0300	1/4"	18-8	9/32"	3"	0.065"	€80.61
P	U55530.012.0062	1/8"	316	1/8"	5/8"	0.065"	€19.31
Q	U51530.012.0062	1/8"	18-8	5/32"	5/8"	0.065"	€35.00
R	U55530.012.0075	1/8"	316	5/32"	3/4"	0.065"	€9.24
S	U55530.037.0300	3/8"	316	3/8"	3"	0.065"	€141.52
T	U55530.037.0175	3/8"	316	3/8"	1.75"	0.065"	€47.41
U	U51530.037.0175	3/8"	18-8	3/8"	1.75"	0.065"	€48.22
V	U51530.037.0300	3/8"	18-8	3/8"	3"	0.065"	€105.30
W	U55530.018.0100	3/16"	316	3/16"	1"	0.065"	€12.44
X	U55530.018.0150	3/16"	316	3/16"	1.5"	0.065"	€41.20
Y	U51530.018.0050	3/16"	18-8	3/16"	1/2"	0.065"	€2.61

GRAINGER -

Steel Fender Washer

Style	Model	Fits Bolt Sizes	Inside Dia.	Outside Dia.	Thickness	Price (ex. VAT)
A	U38160.013.0002	#6	5/32"	9/16"	0.047"	€4.03
B	U38160.019.0002	#10	3/16"	11/16"	0.047"	€6.41
C	U38160.025.0002	1/4"	9/32"	9/16"	0.047"	€3.71
D	U38210.018.0050	3/16"	3/16"	1/2"	0.065"	€1.69
E	U38160.031.0001	5/16"	11/32"	5/8"	0.047"	€2.47
F	U38160.087.0002	7/8"	15/16"	3.25"	0.125"	€22.09

GRAINGER -

18-8 Stainless Steel Flat Washer

Style	Model	Fits Bolt Sizes	Grade	Inside Dia.	Item	Outside Dia.	Package Weight	System of Measurement	Thickness	Price (ex. VAT)
A	U55410.062.0001	5/8"	316	21/32"	Flat Washer	1 5/16"	-	Inch	0.063"	€14.35
B	U55410.031.0001	5/16"	316	11/32"	Flat Washer	11/16"	-	Inch	0.047"	€5.29
C	M51532.060.0001	M6	A2	6.40mm	Plain Washer	17mm	0.882 Lbs.	Metric	3mm	€5.35
D	M55420.070.0001	M7	A4	7.40mm	Plain Washer	14mm	0.153 Lbs.	Metric	1.6mm	€2.53
E	M51532.080.0001	M8	A2	8.40mm	Plain Washer	21mm	1.764 Lbs.	Metric	4mm	€26.81
F	M51532.100.0001	M10	A2	10.50mm	Plain Washer	25 mm	2.426 Lbs.	Metric	4mm	€43.63
G	M51532.120.0001	M12	A2	13.00mm	Plain Washer	30mm	2.646 Lbs.	Metric	6mm	€41.05

GRAINGER -

Steel Flat Washer

Style	Model	Finish	Fits Bolt Sizes	Inside Dia.	Item	Outside Dia.	Package Weight	System of Measurement	Thickness	Price (ex. VAT)
A	B38100.075.0001	Plain	3/4"	13/16"	Flat Washer	2"	14.68 Lbs.	Inch	0.148"	€198.65
B	B38100.087.0001	Plain	7/8"	15/16"	Flat Washer	2.25"	22.00 Lbs.	Inch	0.165"	€118.84
C	B38100.100.0001	Plain	1"	1-1/16"	Flat Washer	2.5"	21.21 Lbs.	Inch	0.165"	€119.24
D	B38100.062.0001	Plain	5/8"	11/16"	Flat Washer	1.75"	20.48 Lbs.	Inch	0.134"	€125.46
E	B38100.050.0001	Plain	1/2"	9/16"	Flat Washer	1.375"	21.34 Lbs.	Inch	0.109"	€118.57
F	M38430.180.0001	Zinc-Plated	M18	19.00mm	Plain Washer	44mm	17.067 Lbs.	Metric	8mm	€231.51
G	M38430.080.0001	Zinc-Plated	M8	8.40mm	Plain Washer	21mm	1.764 Lbs.	Metric	4mm	€9.48
H	M38430.100.0001	Zinc-Plated	M10	10.50mm	Plain Washer	25 mm	2.426 Lbs.	Metric	4mm	€11.05
I	M38430.120.0001	Zinc-Plated	M12	13.00mm	Plain Washer	30mm	5.292 Lbs.	Metric	6mm	€17.84
J	M38430.160.0001	Zinc-Plated	M16	17.00mm	Plain Washer	40mm	9.923 Lbs.	Metric	6mm	€79.38
K	M38430.240.0001	Zinc-Plated	M24	25.00mm	Plain Washer	50mm	11.246 Lbs.	Metric	10mm	€58.55
L	M38430.200.0001	Zinc-Plated	M20	21.00mm	Plain Washer	44mm	14.641 Lbs.	Metric	8mm	€65.24
M	M38430.220.0001	Zinc-Plated	M22	23.00mm	Plain Washer	50mm	10.705 Lbs.	Metric	8mm	€146.93
N	M38430.050.0001	Zinc-Plated	M5	5.30mm	Plain Washer	15mm	0.485 Lbs.	Metric	2mm	€5.71
O	M38430.270.0001	Zinc-Plated	M27	28.00mm	Plain Washer	60mm	9.592 Lbs.	Metric	10mm	€99.13
P	M38430.300.0001	Zinc-Plated	M30	31.00mm	Plain Washer	68mm	11.246 Lbs.	Metric	10mm	€149.59
Q	M38430.060.0001	Zinc-Plated	M6	6.40mm	Plain Washer	17mm	0.882 Lbs.	Metric	3mm	€4.87
R	U38400.008.0002	Zinc-Plated	#2	3/32"	Flat Washer	1/4"	-	Inch	0.031"	€3.13
S	U38400.011.0005	Zinc-Plated	#4	1/8"	Flat Washer	7/16"	-	Inch	0.047"	€2.21
T	M38250.050.0001	Zinc-Plated	M5	5.30mm	Plain Washer	9mm	0.064 Lbs.	Metric	1 mm	€3.01
U	M38250.026.0001	Zinc-Plated	M2.6	2.70mm	Plain Washer	5.5"	0.013 Lbs.	Metric	0.5 mm	€2.79
V	U38400.037.0002	Zinc-Plated	3/8"	13/32"	Flat Washer	1"	-	Inch	0.063"	€5.67
W	U38400.037.0003	Zinc-Plated	3/8"	13/32"	Flat Washer	1.25"	-	Inch	0.109"	€20.12
X	M38250.020.0001	Zinc-Plated	M2	2.20mm	Plain Washer	4.5"	0.007 Lbs.	Metric	0.3mm	€3.01
Y	M38250.030.0001	Zinc-Plated	M3	3.20mm	Plain Washer	6mm	0.015 Lbs.	Metric	0.5 mm	€1.97

APPROVED VENDOR -

Thick Fender Washer, Steel

Style	Model	Fits Bolt Sizes	Inside Dia.	Outside Dia.	Thickness	Thickness Tolerance	Price (ex. VAT)
A	Z9679	#10	7/32"	1"	1/4"	+/-0.025"	€15.85
B	Z9678	#10	7/32"	1"	1/8"	+/-0.013"	€11.69
C	Z9697	1"	1-1/16"	3.5"	1/4"	+/-0.025"	€6.87
D	Z9677	1"	1-1/16"	3.5"	3/8"	+/-0.037"	€29.33
E	Z9674	1"	1-1/16"	3.25"	1/4"	+/-0.025"	€9.71
F	Z9696	1"	1-1/16"	3.5"	1/8"	+/-0.013"	€7.51
G	Z9675	1.25"	1.375"	4"	1/2"	+/-0.050"	€33.73
H	Z9670	1/2"	9/16"	3"	1/4"	+/-0.025"	€18.40
I	Z9688	1/2"	17/32"	2"	1/8"	+/-0.013"	€14.20
J	Z9689	1/2"	17/32"	2"	1/4"	+/-0.025"	€16.25
K	Z9680	1/4"	9/32"	1.5"	1/8"	+/-0.013"	€13.25
L	Z9681	1/4"	9/32"	1.5"	1/4"	+/-0.025"	€15.27
M	Z9698	3/4"	13/16"	3"	3/8"	+/-0.037"	€11.18
N	Z9692	3/4"	13/16"	3"	1/8"	+/-0.013"	€16.92
O	Z9693	3/4"	13/16"	3"	1/4"	+/-0.025"	€18.05
P	Z9684	3/8"	13/32"	2"	1/8"	+/-0.013"	€12.88
Q	Z9685	3/8"	13/32"	2"	1/4"	+/-0.025"	€42.88
R	Z9691	5/8"	11/16"	2.5"	1/4"	+/-0.025"	€16.33
S	Z9671	5/8"	11/16"	3"	1/4"	+/-0.025"	€17.63
T	Z9690	5/8"	11/16"	2.5"	1/8"	+/-0.013"	€16.17
U	Z9682	5/16"	11/32"	2"	1/8"	+/-0.013"	€11.04
V	Z9683	5/16"	11/32"	2"	1/4"	+/-0.025"	€36.96
W	Z9673	7/8"	15/16"	3"	1/4"	+/-0.025"	€10.29
X	Z9699	7/8"	15/16"	3.25"	3/8"	+/-0.037"	€9.54
Y	Z9695	7/8"	15/16"	3.25"	1/4"	+/-0.025"	€23.12

L9 -

Flat Washers

Style	Model	Fits Bolt Sizes	Thickness	Thickness Tolerance	Washer Inside Dia.	Washer O.D.	Price (ex. VAT)
A	448026	1 1/2	0.25"	+/-0.016"	1 9/16"	1"	€274.40	RFQ
A	447026	1 1/2	0.203125"	+/-0.016"	1 41/64"	1"	€698.47	RFQ
A	448024	1 1/4	0.25"	+/-0.016"	1 5/16"	1"	€228.96	RFQ
A	447024	1 1/4	0.182"	+/-0.016"	1 25/64"	1"	€534.55	RFQ
A	447022	1 1/8	0.182"	+/-0.014"	1 17/64"	2 3/4"	€805.38	RFQ
A	448022	1 1/8	0.16"	+/-0.014"	1 3/16"	1"	€326.07	RFQ
A	448020	1"	0.16"	+/-0.014"	1 1/16"	2 1/32"	€223.62	RFQ
A	447020	1"	0.162"	+/-0.014"	1 3/32"	2 1/2"	€292.22	RFQ
A	447010	1/2"	0.140625"	+/-0.011"	17/32"	1 3/8"	€180.85	RFQ
A	448010	1/2"	0.109375"	+/-0.011"	17/32"	1 3/4"	€130.07	RFQ
A	447002	1/4"	0.078125"	+/-0.008"	17/64"	1"	€77.06	RFQ
A	448002	1/4"	0.063"	+/-0.008"	9/32"	5/8"	€66.37	RFQ
A	447016	3/4"	0.162"	+/-0.014"	25/32"	2"	€370.62	RFQ
A	448016	3/4"	0.16"	+/-0.014"	13/16"	1 31/64"	€224.51	RFQ
A	448006	3/8"	0.109375"	+/-0.011"	27/64"	13/16"	€105.13	RFQ
A	447006	3/8"	0.086"	+/-0.011"	13/32"	1"	€135.42	RFQ
A	447014	5/8"	0.162"	+/-0.014"	41/64"	1 3/4"	€354.58	RFQ
A	448014	5/8"	0.16"	+/-0.014"	21/32"	1"	€225.40	RFQ
A	447004	5/16"	0.086"	+/-0.008"	11/32"	7/8"	€105.13	RFQ
A	448004	5/16"	0.063"	+/-0.008"	11/32"	11/16"	€83.75	RFQ
A	447018	7/8"	0.162"	+/-0.014"	15/16"	2 1/4"	€392.00	RFQ
A	448018	7/8"	0.16"	+/-0.014"	15/16"	1 49/64"	€261.04	RFQ
A	448008	7/16"	0.109375"	+/-0.011"	15/32"	59/64"	€65.48	RFQ
A	447008	7/16"	0.109375"	+/-0.011"	15/32"	1 1/8"	€81.07	RFQ
A	448012	9/16"	0.109375"	+/-0.011"	19/32"	1 11/64"	€181.75	RFQ

EARNEST -

Flat Washers

Style	Model	Fits Bolt Sizes	Inside Dia.	Outside Dia.	Package Weight	Size	Price (ex. VAT)
A	510120G	1"	1-1/16"	2"	2	1"	€21.37
A	510124G	1.25"	1.375"	2.5"	2.92	1 1/4 Lbs.	€35.23
A	510122G	1.125"	1.187"	2.25"	2.43	1 1/8"	€16.91
A	510128G	1.375"	1.437"	2.75"	1.53	1 3/8"	€11.79

APPROVED VENDOR -

Flat Washer 18-8 Sst

Style	Model	Fits Bolt Sizes	Inside Dia.	Outside Dia.	Thickness	Type	Price (ex. VAT)
A	U51420.050.0001	1/2"	9/16"	1.375"	0.109"	USS	€10.42
B	U51420.025.0001	1/4"	5/16"	47/64"	0.065"	USS	€3.56
C	U51420.037.0001	3/8"	7/16"	1"	0.083"	USS	€7.96
D	U51420.031.0001	5/16"	3/8"	7/8"	0.083"	USS	€4.39
E	U51410.087.0001	7/8"	29/32"	1.75"	0.156"	Thick	€9.41
F	U51420.043.0001	7/16"	5"	11/4"	0.083"	USS	€9.92

GRUVLOK -

7013 Seal Rings

Style	Model	Price (ex. VAT)
A	0390081104	€116.29	RFQ
A	0390081106	€135.08	RFQ
A	0390081100	€94.41	RFQ
A	0390081108	€163.11	RFQ
A	0390081102	€99.78	RFQ
A	0390081116	€474.36	RFQ
A	0390081114	€325.46	RFQ
A	0390081110	€186.14	RFQ
A	0390081112	€234.89	RFQ

THOMAS & BETTS -

Piercing Washers

Style	Model	Price (ex. VAT)
A	RJ757	€13.58	RFQ
A	RJ9711	€12.82	RFQ
A	RJ9731	€12.82	RFQ
A	RJ9751	€13.58	RFQ
A	RM9731	€22.17	RFQ

THOMAS & BETTS -

Reducer Washers

Style	Model	Price (ex. VAT)
A	B71UF	€1.53	RFQ
B	RB877U	€2.35	RFQ
A	RJ737NP	€16.31	RFQ
C	RG9751	€9.13	RFQ
C	RG9731	€8.62	RFQ
A	RG9711UF	€11.94	RFQ
C	RG9711	€8.62	RFQ
D	RF10731U	€7.76	RFQ
A	RC363U	€2.16	RFQ
A	RB873U	€1.90	RFQ
E	B75TB	€1.04	RFQ
A	RB873NP	€1.00	RFQ
A	RB1333UNP	€1.67	RFQ
E	C72M	€1.06	RFQ
A	BC79NP	€1.12	RFQ
A	BC72NP	€1.10	RFQ
A	B87NPM	€0.69	RFQ
A	B86NP	€0.43	RFQ
A	RZ83NP	€2.96	RFQ

THOMAS & BETTS -

Compression And Flat Washers

Style	Model	Price (ex. VAT)
A	401	€22.36	RFQ
A	402	€32.99	RFQ
A	408	€198.10	RFQ
A	409	€264.42	RFQ

COOPER B-LINE -

Washer Splice Kits

Style	Model
A	WASHER SPL KIT SS	RFQ
A	WASHER SPL KIT	RFQ
A	WASHER SPL KIT BLE	RFQ

COOPER B-LINE -

B450 Series U Washers

Style	Model
A	B450-1/2GRN	RFQ
A	B450-1/2HDG	RFQ
A	B450-1/2SS4	RFQ
A	B450-1/2ZN	RFQ
A	B450-1/4GRN	RFQ
A	B450-1/4ZN	RFQ
A	B450-3/4GRN	RFQ
A	B450-3/4ZN	RFQ
A	B450-3/8GRN	RFQ
A	B450-3/8HDG	RFQ
A	B450-3/8SS4	RFQ
A	B450-3/8YZN	RFQ
A	B450-3/8ZN	RFQ
A	B450-5/8GRN	RFQ
A	B450-5/8YZN	RFQ
A	B450-5/8ZN	RFQ

COOPER B-LINE -

B3248 Steel Washer Plates

Style	Model
A	B3248-1/2 PLN	RFQ
A	B3248-1/2 ZN	RFQ
A	B3248-1 PLN	RFQ
A	B3248-1 ZN	RFQ
A	B3248-3/4 PLN	RFQ
A	B3248-3/4 ZN	RFQ
A	B3248-3/8 PLN	RFQ
A	B3248-3/8 ZN	RFQ
A	B3248-5/8 PLN	RFQ
A	B3248-5/8 ZN	RFQ
A	B3248-7/8 PLN	RFQ
A	B3248-7/8 ZN	RFQ

COOPER B-LINE -

Flat Fender Washers

Style	Model
A	1/2X2FFWZN	RFQ
A	1/4X11/2FFWZN	RFQ
A	1/4X11/4FFWZN	RFQ
A	3/8X11/2FFWZN	RFQ
A	3/8X1 1/4 FFW YZN	RFQ
A	3/8X11/4FFWZN	RFQ

COOPER B-LINE -

Fender Washers

Style	Model
A	WSHR,FENDER 1/4X1 1/4 SS6	RFQ
A	WSHR,FENDER 3/8X1 1/2 SS6	RFQ
A	WSHR,FENDER 3/8X1 1/4 SS4	RFQ
A	WSHR,FENDER 3/8X1 1/4 SS6	RFQ

COOPER B-LINE -

Washers

Style	Model
A	SUPT WASHER SS	RFQ
A	SUPT WASHER BLE	RFQ
B	TOP WASHER	RFQ

COOPER B-LINE -

Flat Washers

Style	Model	Item
A	BFVFW1	Flat Washer	RFQ
B	1/4 FW NYL BOXED	Flat Washer	RFQ
B	5/8 FW YZN BOXED	Flat Washer	RFQ
B	5/16 FW YZN BOXED	Flat Washer	RFQ
B	5/16 FW SB BOXED	Flat Washer	RFQ
B	5/16 FW NYL BOXED	Flat Washer	RFQ
C	3/8FWZN	Flat Washer	RFQ
B	3/8 FW YZN BOXED	Flat Washer	RFQ
B	3/8 FW SB BOXED	Flat Washer	RFQ
B	3/8 FW NYL BOXED	Flat Washer	RFQ
C	1/4FWZN	Flat Washer	RFQ
B	1/4 FW YZN BOXED	Flat Washer	RFQ
C	1/2FWZN	Flat Washer	RFQ
A	BFVFW1/2	Flat Washer	RFQ
B	1/2 FW YZN BOXED	Flat Washer	RFQ
A	BFVFW5/8	Flat Washer	RFQ
A	BFVFW3/8	Flat Washer	RFQ
A	BFVFW3/4	Flat Washer	RFQ
C	5/8FWZN	Flat Washer	RFQ
C	WSHR,FLT 3/8 SS6 48/BAG	Washer	RFQ
C	WSHR,FLT 3/8 SS4	Washer	RFQ
C	WSHR,FLT 1/4 SS6	Washer	RFQ
C	WSHR,FLT 1/4 SS4	Washer	RFQ
C	WSHR,FLT 1/2 SS6	Washer	RFQ
C	WSHR,FLT 1/2 SS4	Washer	RFQ

FOREVERBOLT -

Fender Washers

Style	Model	Fits Bolt Sizes	Grade	Inside Dia.	Package Weight	Rockwell Hardness	Thickness	Thickness Tolerance	Price (ex. VAT)
A	FB3FEWASH122P5	1/2"	316	17/32"	0.25	B80	0.062"	+/-0.010"	€18.70
B	FBFEWASHT122	1/2"	18-8	17/32"	0.1	B70	1/8"	+/-0.015"	€7.87
C	FBFEWASHT382	3/8"	18-8	13/32"	0.1	B70	1/8"	+/-0.015"	€6.28

TE-CO -

Flat Washers

Style	Model	Fits Bolt Sizes	Inside Dia.	Outside Dia.	Size	Thickness	Price (ex. VAT)
A	42674	#8	3/16"	7/16"	-	5/64	€0.18
B	42660	#10	13/64"	1/2"	-	3/32"	€0.25
C	42670	1.125"	1.150"	2.25"	1 1/8"	7/32"	€19.69
D	42667	3/4"	25/32"	1.625"	3/4"	5/32	€1.24
E	426631	3/8"	13/32"	7/8"	3/8"	1/8"	€16.18
B	42666	5/8"	21/32"	1.375"	5/8"	1/8"	€15.85

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Flat Washers

Flat washers are used with threaded fasteners for distributing the load uniformly and reducing frictional losses during screw tightening. These units are used for providing spacing and electrical insulation in control boxes. Raptor Supplies offers a wide array of flat washers from Accurate Mfd Products, Apollo, Armor Coat, C. Sherman Johnson, Dynaform, Earnest, Fabory, Foreverbolt, Grainger, Master Products, Metric Blue, TE-CO and Micro Plastics.

Features

Flat washers are designed to decrease friction, stop leakage, prevent loosening and reduce the distribution of pressure.
They enhance the size of a screw's bearing surface and decrease the surface pressure applied to the fastened object.
These washers secure surfaces by evenly distributing torque when a bolt or screw is tightened.
They eliminate corrosion between a steel screw and an aluminium surface.

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