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Split Lock Washers

Bolts backing off from vibration? Split lock washers bite in to help hold clamp load so your assemblies stay tight. Match the washer to the job: Grade 5, Grade 8 or Class 10 for strength, zinc or Armor Coat for corrosion, 18-8 or 316 stainless for wet or chemical areas, aluminum to reduce galvanic issues, plus metric options.

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169 results
KM-USA Class 10 Lock Washers
KM-USA Class 10 Lock Washers
KM-USA Class 10 split lock washers made from alloy steel with yellow zinc plating. Designed for metric applications and to pair with 10.9 cap screws, the split design helps resist loosening under vibration and the plated finish provides corrosion protection for general fastening use.
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M6
1.6 mm
50
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M8
2 mm
50
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M10
2.2 mm
50
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M12
2.5 mm
50
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M14
3 mm
25
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M16
3.5 mm
25
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M20
4 mm
25
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M22
4 mm
10
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M24
5 mm
10
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Grade 8 Split Lock Washers - Yellow Zinc Plated
Grade 8 Split Lock Washers - Yellow Zinc Plated
Grade 8 split lock washers made from heat-treated alloy steel with yellow zinc plating. Designed for use with Grade 8 bolts, the split design helps prevent fastener loosening and the zinc yellow finish resists corrosion. Suitable for heavy-duty assemblies.
Bolt Size Width Thickness Material Finish Package Qty Item #
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1/4"
0.109"
0.062"
Alloy Steel
Zinc Yellow Plated
100
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1/4"
0.109"
0.062"
Alloy Steel
Zinc Yellow Plated
200
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1/4"
0.109"
0.062"
Alloy Steel
Zinc Yellow Plated
500
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5/16"
0.125"
0.078"
Alloy Steel
Zinc Yellow Plated
100
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5/16"
0.125"
0.078"
Alloy Steel
Zinc Yellow Plated
200
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5/16"
0.125"
0.078"
Alloy Steel
Zinc Yellow Plated
500
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3/8"
0.141"
0.094"
Alloy Steel
Zinc Yellow Plated
100
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3/8"
0.141"
0.094"
Alloy Steel
Zinc Yellow Plated
200
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7/16"
0.156"
0.109"
Alloy Steel
Zinc Yellow Plated
100
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7/16"
0.156"
0.109"
Alloy Steel
Zinc Yellow Plated
200
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1/2"
0.171"
0.125"
Alloy Steel
Zinc Yellow Plated
100
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1/2"
0.171"
0.125"
Alloy Steel
Zinc Yellow Plated
200
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Grade 8 Split Lock Washers - Plain Finish
Grade 8 Split Lock Washers - Plain Finish
Grade 8 split lock washers made from heat-treated alloy steel with a plain finish. Designed for use with Grade 8 bolts, the split design provides locking action to resist loosening under vibration and helps maintain clamp load. Suited for heavy-duty assembly applications.
Bolt Size Width Thickness Material Finish Package Qty Item #
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1/4"
0.109"
0.062"
Alloy Steel
Plain
100
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5/16"
0.125"
0.078"
Alloy Steel
Plain
100
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3/8"
0.141"
0.094"
Alloy Steel
Plain
100
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7/16"
0.156"
0.109"
Alloy Steel
Plain
100
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1/2"
0.171"
0.125"
Alloy Steel
Plain
100
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9/16"
0.188"
0.141"
Alloy Steel
Plain
50
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5/8"
0.203"
0.156"
Alloy Steel
Plain
25
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3/4"
0.234"
0.188"
Alloy Steel
Plain
25
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7/8"
0.266"
0.219"
Alloy Steel
Plain
25
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1"
0.297"
0.25"
Alloy Steel
Plain
25
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Grade 8 Split Lock Washers - Armor Coat™
Grade 8 Split Lock Washers - Armor Coat™
Grade 8 split lock washers made from heat-treated alloy steel with Armor Coat™ finish. Designed for use with Grade 8 bolts, they provide high tensile strength and enhanced corrosion resistance, while the Armor Coat™ finish helps resist salt spray and extends service life in harsh environments.
Bolt Size Width Thickness Material Finish Package Qty Item #
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1/4"
0.109"
0.062"
Alloy Steel
Armor Coat
100
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5/16"
0.125"
0.078"
Alloy Steel
Armor Coat
100
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3/8"
0.141"
0.094"
Alloy Steel
Armor Coat
100
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7/16"
0.156"
0.109"
Alloy Steel
Armor Coat
100
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1/2"
0.171"
0.125"
Alloy Steel
Armor Coat
100
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5/8"
0.203"
0.156"
Alloy Steel
Armor Coat
25
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3/4"
0.234"
0.188"
Alloy Steel
Armor Coat
25
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Grade 5 Split Lock Washers - Zinc Plated
Grade 5 Split Lock Washers - Zinc Plated
Grade 5 split lock washers made from carbon steel with a zinc-plated finish. Designed for use with Grade 5 bolts, the split design helps resist loosening under vibration and provides secure clamping for assemblies. Available across common SAE diameters for general fastening.
Bolt Size Width Thickness Material Finish Package Qty Item #
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#4
0.038"
0.025"
Carbon Steel
Zinc Plated
100
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#6
0.047"
0.031"
Carbon Steel
Zinc Plated
100
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#8
0.055"
0.04"
Carbon Steel
Zinc Plated
100
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#10
0.062"
0.047"
Carbon Steel
Zinc Plated
100
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#10
0.062"
0.047"
Carbon Steel
Zinc Plated
200
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#12
0.07"
0.056"
Carbon Steel
Zinc Plated
100
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#12
0.07"
0.056"
Carbon Steel
Zinc Plated
200
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1/4"
0.109"
0.062"
Carbon Steel
Zinc Plated
100
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1/4"
0.109"
0.062"
Carbon Steel
Zinc Plated
200
Log in to view price
1/4"
0.109"
0.062"
Carbon Steel
Zinc Plated
500
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5/16"
0.125"
0.078"
Carbon Steel
Zinc Plated
100
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5/16"
0.125"
0.078"
Carbon Steel
Zinc Plated
200
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Grade 5 Split Lock Washers - Plain Finish
Grade 5 Split Lock Washers - Plain Finish
Grade 5 split lock washers made from carbon steel with a plain finish. Split design provides axial locking to resist loosening under vibration and is sized for Grade 5 bolts. Suitable for general mechanical assemblies where secure fastener retention is required.
Bolt Size Width Thickness Material Finish Package Qty Item #
Price
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1/4"
0.109"
0.062"
Carbon Steel
Plain
100
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5/16"
0.125"
0.078"
Carbon Steel
Plain
100
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3/8"
0.141"
0.094"
Carbon Steel
Plain
100
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7/16"
0.156"
0.109"
Carbon Steel
Plain
100
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1/2"
0.171"
0.125"
Carbon Steel
Plain
100
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9/16"
0.188"
0.141"
Carbon Steel
Plain
50
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5/8"
0.203"
0.156"
Carbon Steel
Plain
50
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3/4"
0.234"
0.188"
Carbon Steel
Plain
50
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7/8"
0.266"
0.219"
Carbon Steel
Plain
50
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1"
0.297"
0.25"
Carbon Steel
Plain
50
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Metric Alloy Steel Lock Washers
Metric Alloy Steel Lock Washers
Metric M18 split lock washer made from high alloy 4037 steel with a zinc plated finish. Heat-treated to RC 38 - 46 hardness for Class 10 performance, it resists bowing and distortion under high clamping loads and provides consistent locking force for heavy-duty metric fastenings.
Bolt Size Inside Diameter Outside Diameter Thickness Finish Material Package Qty Item #
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M18
18.2 mm
29.4 mm
3.5 mm
Zinc Plated
Alloy Steel
25
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Metric Zinc Plated Lock Washers
Metric Zinc Plated Lock Washers
Metric zinc plated split lock washers made from spring steel. Class 8 strength and zinc finish resist corrosion while the split design provides axial tension to help prevent fastener loosening. Suited for metric bolt applications where reliable locking performance is required.
Bolt Size Inside Diameter Outside Diameter Thickness Material Finish Package Qty Item #
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M4
4.1 mm
7.6 mm
0.9 mm
Spring Steel
Zinc Plated
50
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M5
5.1 mm
9.2 mm
1.2 mm
Spring Steel
Zinc Plated
50
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M6
6.1 mm
11.8 mm
1.6 mm
Spring Steel
Zinc Plated
50
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M7
7.1 mm
12.8 mm
1.6 mm
Spring Steel
Zinc Plated
50
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M8
8.1 mm
14.8 mm
2 mm
Spring Steel
Zinc Plated
50
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M10
10.2 mm
18.1 mm
2.2 mm
Spring Steel
Zinc Plated
50
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M12
12.2 mm
21.1 mm
2.5 mm
Spring Steel
Zinc Plated
50
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M14
14.2 mm
24.1 mm
3 mm
Spring Steel
Zinc Plated
25
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M16
16.2 mm
27.4 mm
3.5 mm
Spring Steel
Zinc Plated
25
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M18
18.2 mm
29.4 mm
3.5 mm
Spring Steel
Zinc Plated
25
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M20
20.2 mm
33.6 mm
4 mm
Spring Steel
Zinc Plated
25
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M22
22.5 mm
35.9 mm
4 mm
Spring Steel
Zinc Plated
10
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18-8 Stainless Steel Medium Split Lock Washers
18-8 Stainless Steel Medium Split Lock Washers
Medium split lock washers made from 18-8 stainless steel. Corrosion-resistant construction and split-ring design provide reliable locking action to help resist loosening under vibration. Suitable for general fastening and assembly applications where corrosion resistance is needed.
Bolt Size Width Thickness Material Package Qty Item #
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#2
0.035"
0.02"
18-8 Stainless Steel
100
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#4
0.04"
0.03"
18-8 Stainless Steel
100
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#6
0.047"
0.035"
18-8 Stainless Steel
100
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#8
0.055"
0.04"
18-8 Stainless Steel
100
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#10
0.062"
0.05"
18-8 Stainless Steel
100
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#12
0.07"
0.05"
18-8 Stainless Steel
100
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1/4"
0.109"
0.062"
18-8 Stainless Steel
100
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5/16"
0.125"
0.078"
18-8 Stainless Steel
100
Log in to view price
3/8"
0.141"
0.094"
18-8 Stainless Steel
50
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7/16"
0.156"
0.109"
18-8 Stainless Steel
50
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1/2"
0.171"
0.125"
18-8 Stainless Steel
50
Log in to view price
9/16"
0.188"
0.141"
18-8 Stainless Steel
25
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18-8 Stainless Steel Lock Washers
18-8 Stainless Steel Lock Washers
A set of split lock washers manufactured from 18-8 stainless steel, offering corrosion resistance and a spring-like split design that helps prevent fastener loosening. Metric sizes cover small to large bolt diameters for general industrial and maintenance applications.
Bolt Size Inside Diameter Outside Diameter Thickness Material Package Qty Item #
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M2
2.1 mm
4.4 mm
0.5 mm
18-8 Stainless Steel
100
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M3
3.1 mm
6.2 mm
0.8 mm
18-8 Stainless Steel
100
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M4
4.1 mm
7.6 mm
0.9 mm
18-8 Stainless Steel
100
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M5
5.1 mm
9.2 mm
1.2 mm
18-8 Stainless Steel
100
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M6
6.1 mm
11.8 mm
1.6 mm
18-8 Stainless Steel
50
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M8
8.1 mm
14.8 mm
2 mm
18-8 Stainless Steel
50
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M10
10.2 mm
18.1 mm
2.2 mm
18-8 Stainless Steel
25
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M12
12.2 mm
21.1 mm
2.5 mm
18-8 Stainless Steel
25
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M14
14.2 mm
24.1 mm
3 mm
18-8 Stainless Steel
10
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M16
16.2 mm
27.4 mm
3.5 mm
18-8 Stainless Steel
10
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M20
20.5 mm
33.6 mm
4 mm
18-8 Stainless Steel
10
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M24
24.5 mm
40 mm
5 mm
18-8 Stainless Steel
10
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316 Stainless Steel Split Lock Washers
316 Stainless Steel Split Lock Washers
316 stainless steel split lock washers designed for corrosion resistance and stamped with grade marking. Made from 316 stainless steel with a helical split that provides predictable locking force and helps resist corrosion in marine or outdoor fastenings.
Bolt Size Width Thickness Material Package Qty Item #
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#6
0.047"
0.031"
316 Stainless Steel
100
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#8
0.055"
0.04"
316 Stainless Steel
100
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#10
0.062"
0.047"
316 Stainless Steel
100
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1/4"
0.109"
0.062"
316 Stainless Steel
100
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5/16"
0.125"
0.078"
316 Stainless Steel
100
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3/8"
0.141"
0.094"
316 Stainless Steel
50
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7/16"
0.156"
0.109"
316 Stainless Steel
50
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1/2"
0.171"
0.125"
316 Stainless Steel
50
Log in to view price
5/8"
0.203"
0.156"
316 Stainless Steel
25
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3/4"
0.234"
0.188"
316 Stainless Steel
15
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7/8"
0.266"
0.219"
316 Stainless Steel
15
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1"
0.305"
0.26"
316 Stainless Steel
15
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Metric 316 Stainless Steel Lock Washers
Metric 316 Stainless Steel Lock Washers
Metric split lock washers made from 316 stainless steel. Corrosion-resistant construction provides durability in wet or marine environments and the split design helps resist loosening under vibration.
Bolt Size Inside Diameter Outside Diameter Thickness Material Package Qty Item #
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M6
6.1 mm
11.8 mm
1.6 mm
316 Stainless Steel
50
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M8
8.1 mm
14.8 mm
2 mm
316 Stainless Steel
50
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M10
10.2 mm
18.1 mm
2.2 mm
316 Stainless Steel
25
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M12
12.2 mm
21.1 mm
2.5 mm
316 Stainless Steel
25
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Silicon Bronze Split Lock Washers
Silicon Bronze Split Lock Washers
Silicon bronze split lock washers in alloy 651 designed for fastening assemblies where corrosion resistance and electrical conductivity matter. Non‑magnetic material resists seawater and atmospheric corrosion, helping maintain clamp load in marine, power and industrial applications.
Bolt Size Width Thickness Material Package Qty Item #
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#4
0.038"
0.025"
Silicon Bronze
100
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#6
0.047"
0.031"
Silicon Bronze
100
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#8
0.055"
0.04"
Silicon Bronze
100
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#10
0.062"
0.047"
Silicon Bronze
100
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1/4"
0.109"
0.062"
Silicon Bronze
100
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5/16"
0.125"
0.078"
Silicon Bronze
50
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3/8"
0.141"
0.094"
Silicon Bronze
50
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1/2"
0.171"
0.125"
Silicon Bronze
25
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Split Lock Washers #8
Split Lock Washers #8
Split lock washer for #8 fasteners made from carbon steel with a plain finish and Grade 5 specification. Helical split design provides spring tension to resist loosening under vibration and helps maintain clamp load when used with Grade 5 bolts. Suitable for general mechanical assemblies.
Bolt Size Width Thickness Material Finish Package Qty Item #
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#8
0.055"
0.04"
Carbon Steel
Plain
50
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Aluminum Lock Washers
Aluminum Lock Washers
Aluminum lock washer made from 3003-H14 alloy. USS style for 5/16" bolt size. Lightweight and corrosion-resistant for aluminum assemblies; helps reduce galvanic corrosion when fastening similar metals.
Bolt Size Inside Diameter Outside Diameter Measurement Type Package Qty Item #
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5/16"
21/64"
37/64"
USS
25
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Pkg Qty: 15
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130 of 169 Results

Kimball Midwest offers a premium selection of split lock washers, designed to provide superior vibration resistance and secure fastening in demanding applications. Our alloy steel split lock washers, made from heat-treated prime alloy steel, are engineered for use with Grade 8 bolts, delivering a minimum tensile strength of 150,000 PSI. For added durability, they are available with an optional ARMOR COAT™, which provides 10 times more corrosion resistance than traditional zinc plated washers, surpassing 1,000-hour salt spray tests.

We also offer zinc alloy steel split lock washers, featuring a zinc yellow finish with hexavalent chromate plating for enhanced corrosion protection, making them ideal for high-strength applications. Additionally, our stainless steel split lock washers, made from 18-8 stainless steel, offer excellent corrosion resistance for harsh environments.

Kimball Midwest provides high-quality solutions to meet your fastening requirements. Trust our lock washer options for superior performance and long-lasting reliability.

Contact a local sales representative today to get the split lock washers you need.

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