System of Measurement
Thread Direction
Height
Height
1/16"
3/32"
7/64"
1/8"
9/64"
5/32"
11/64"
3/16"
13/64"
7/32"
15/64"
1/4"
17/64"
9/32"
19/64"
5/16"
21/64"
11/32"
23/64"
3/8"
25/64"
13/32"
27/64"
7/16"
29/64"
15/32"
31/64"
1/2"
33/64"
17/32"
35/64"
9/16"
37/64"
19/32"
39/64"
5/8"
41/64"
21/32"
11/16"
45/64"
23/32"
47/64"
3/4"
49/64"
25/32"
51/64"
13/16"
53/64"
27/32"
55/64"
7/8"
57/64"
29/32"
59/64"
15/16"
31/32"
63/64"
1"
1 1/64"
1 1/32"
1 3/64"
1 1/16"
1 3/32"
1 7/64"
1 1/8"
1 9/64"
1 11/64"
1 3/16"
1 13/64"
1 1/4"
1 17/64"
1 9/32"
1 5/16"
1 25/64"
1 13/32"
1 15/32"
1 1/2"
1 37/64"
1 39/64"
1 41/64"
1 43/64"
1 11/16"
1 23/32"
1 3/4"
1 51/64"
1 59/64"
1 15/16"
2 1/32"
2 3/16"
2 5/16"
2 13/32"
2 41/64"
2 13/16"
2.8 mm
3 mm
3.2 mm
3.3 mm
3.5 mm
3.7 mm
3.8 mm
3.9 mm
4 mm
4.1 mm
4.2 mm
4.5 mm
4.6 mm
4.8 mm
5 mm
5.1 mm
5.2 mm
5.3 mm
5.5 mm
6 mm
6.2 mm
6.3 mm
6.4 mm
6.5 mm
6.6 mm
6.8 mm
7.2 mm
7.3 mm
7.5 mm
7.8 mm
8 mm
8.5 mm
8.6 mm
8.8 mm
9.2 mm
9.5 mm
9.7 mm
10 mm
10.3 mm
10.4 mm
10.7 mm
11 mm
11.4 mm
11.5 mm
11.7 mm
12 mm
12.5 mm
13 mm
13.8 mm
14 mm
14.6 mm
14.9 mm
15 mm
15.6 mm
16 mm
17.8 mm
18 mm
18.2 mm
18.5 mm
19 mm
20 mm
20.8 mm
21 mm
21.5 mm
22 mm
22.23 mm
23.4 mm
24 mm
24.4 mm
25 mm
26 mm
27 mm
28 mm
28.6 mm
30 mm
31.2 mm
33 mm
36 mm
38 mm
39 mm
42 mm
45 mm
46 mm
48 mm
50 mm
57 mm
Specifications Met
DIN 935
DIN 980, ISO 7042
DIN 980V
DIN 982
DIN 982, ISO 7040
DIN 985
DIN 985, ISO 10511
ISO 10511
ISO 10511, DIN 985
MS17830-010C, NASM17830
MS17830-02C, MS21044C02, NASM17830, NASM21044
MS17830-4C, NASM17830
MS17830-5C, NASM17830
MS17830-6C, NASM17830
MS17830-6F, MS21044C6, NASM17830, NASM21044
MS17830-7F, MS21044C7, NASM17830, NASM21044
MS21044-N04
MS21044-N06
MS21044-N08
MS21044-N10
MS21044-N3
MS21044-N4
MS21044-N5
MS21044-N6
MS21044-N8
MS21044C04, NASM21044
MS21044C06, NASM21044
MS21044C08, NASM21044
MS21044C3, NASM21044
MS21044C4, NASM21044
MS21045-04
MS21045-06
MS21045-08
MS21045-10
MS21045-12
MS21045-3
MS21045-4
MS21045-5
MS21045-6
MS21045-7
MS21045-8
MS21045-9
MS21046C04, NASM21046
MS21046C06, NASM21046
MS21046C08, NASM21046
MS21046C3, NASM21046
MS21046C4, NASM21046
MS21046C6, NASM21046
MS21083C02, NASM21083
MS21083C04, NASM21083
MS21083C06, NASM21083
MS21083C08, NASM21083
MS21083C10, NASM21083
MS21083C3, NASM21083
MS21083C4, NASM21083
MS21083C5, NASM21083
MS21083C6, NASM21083
MS21083C7, NASM21083
MS21083C8, NASM21083
MS21083N04, NASM21083
MS21083N06, NASM21083
MS21083N08, NASM21083
MS21083N3, NASM21083
MS21083N4, NASM21083
MS21083N8, NASM21083
Drive Style
Product Categories Nuts / Locknuts

Locknuts

1610 Products

Nylon-Insert Locknuts

High-Strength Steel Nylon-Insert Locknuts—Grade 8
Includes inch thread sizes. These Grade 8 steel locknuts are 25% stronger than our medium-strength steel nylon-insert locknuts.
Metric High-Strength SteelNylon-Insert Locknuts—Class 10
A nylon insert keeps metric bolt threads from coming loose due to vibration, wear, and temperature swings. About 25% stronger than medium-strength steel locknuts, these nuts are made of high-strength, Class 10 steel.
Metric Fine-Thread High-StrengthSteel Nylon-Insert Locknuts—Class 10
Closely spaced metric threads prevent loosening from vibration. These Class 10 steel locknuts are 25% stronger than our medium-strength steel nylon-insert locknuts.
Medium-Strength Steel Nylon-Insert Locknuts—Grade 5
Made from Grade 5 steel, these locknuts are suitable for fastening most machinery and equipment.
Metric Medium-Strength SteelNylon-Insert Locknuts—Class 8
Made from medium-strength steel with a nylon insert, these Class 8 metric locknuts are strong enough to use on most machinery and equipment that’s prone to vibration and temperature changes.
Metric Fine-Thread Medium-StrengthSteel Nylon-Insert Locknuts—Class 8
Get a grip on metric bolts exposed to vibration, wear, and changes in temperature. These metric locknuts have a nylon insert that holds onto bolts without damaging their threads.
Low-Strength Steel Nylon-Insert Locknuts
Made from low-strength steel, these locknuts should be used for light duty fastening applications, such as securing.access panels.
Mil. Spec. Low-Strength Steel Nylon-Insert Locknuts
Choose these locknuts for their adherence to strict military standards for material and construction. They’re low-strength steel, so they should be used for fastening panels and other light duty fastening applications.
18-8 Stainless Steel Nylon-Insert Locknuts
These locknuts have good chemical resistance.
Metric 18-8 Stainless Steel Nylon-Insert Locknuts
These metric locknuts have good chemical resistance.
Mil. Spec. 18-8 Stainless Steel Nylon-Insert Locknuts
Choose these locknuts for their adherence to strict military standards for material and construction.
Super-Corrosion-Resistant 316Stainless Steel Nylon-Insert Locknuts
More corrosion resistant than 18-8 stainless steel locknuts, these locknuts have excellent resistance to chemicals and salt water.
Metric Super-Corrosion-Resistant 316Stainless Steel Nylon-Insert Locknuts
More corrosion resistant than 18-8 stainless steel locknuts, these metric locknuts have excellent resistance to chemicals and salt water.
Aluminum Nylon-Insert Locknuts
One-third the weight of steel, aluminum locknuts resist corrosion in wet environments.
Brass Nylon-Insert Locknuts
Brass locknuts are corrosion resistant in wet environments and electrically conductive.
Titanium Nylon-Insert Locknuts
Titanium locknuts have a high strength-to-weight ratio and are resistant to acids and salt water.

Thin Nylon-Insert Locknuts

Low-Strength Steel Thin Nylon-Insert Locknuts
These locknuts are about half the height of standard nylon-insert locknuts. Use them in light duty low clearance applications or jam one against a hex nut to hold it in place.
Metric Low-Strength Steel Thin Nylon-Insert Locknuts
With a shorter hex height than standard DIN 985 locknuts, these nylon-insert locknuts meet international ISO 10511 dimensional standards and are easy to install in tight spaces.
Mil. Spec. Low-Strength Steel Thin Nylon-Insert Locknuts
Choose these locknuts for their adherence to strict military standards for material and construction.
High-Strength Steel Thin Nylon-Insert Locknuts
These Grade 8 locknuts are about 25% stronger than medium-strength steel thin locknuts.
Medium-Strength Steel Thin Nylon-Insert Locknuts
Grade 5 locknuts are suitable for fastening most machinery and equipment when used in conjunction with a standard hex nut.
18-8 Stainless Steel Thin Nylon-Insert Locknuts
These locknuts have good chemical resistance and may be mildly magnetic.
Mil. Spec. 18-8 Stainless Steel Thin Nylon-Insert Locknuts
Choose these locknuts for their adherence to strict military standards for material and construction.
Super-Corrosion-Resistant 316 StainlessSteel Thin Nylon-Insert Locknuts
More corrosion resistant than 18-8 stainless steel locknuts, these have excellent resistance to chemicals and salt water.

Thin Heavy Nylon-Insert Locknuts

High-Strength Steel Thin Heavy Nylon-Insert Locknuts
Comparable in strength to Grade 8 bolts, these locknuts are about three times stronger than the same locknut made with low-strength steel.
Low-Strength Steel Thin Heavy Nylon-Insert Locknuts
Use these locknuts for light duty fastening applications, such as securing access panels.
18-8 Stainless Steel Thin Heavy Nylon-Insert Locknuts
These locknuts have good chemical resistance.
Super-Corrosion-Resistant 316 StainlessSteel Thin Heavy Nylon-Insert Locknuts
More corrosion resistant than 18-8 stainless steel locknuts, these have excellent resistance to chemicals and salt water.

Heavy Nylon-Insert Locknuts

18-8 Stainless Steel Heavy Nylon-Insert Locknuts
These locknuts have good chemical resistance.
Super-Corrosion-Resistant 316 StainlessSteel Heavy Nylon-Insert Locknuts
More corrosion resistant than 18-8 stainless steel locknuts, these have excellent resistance to chemicals and salt water.
Steel Heavy Nylon-Insert Locknuts
Known for their strength, these locknuts are zinc-plated to resist corrosion in wet environments.
High-Strength Steel HeavyNylon-Insert Locknuts—Grade 8
Made from Grade 8 steel, these locknuts are about 25% stronger than the same locknut made with medium-strength steel.

Locknuts with Washer

Steel Locknuts with External-Tooth Lock Washer
Also known as Keps and K Lock nuts, these locknuts have a free-spinning tooth lock washer that grips the material surface instead of threads for easy installation and mild vibration resistance.
Metric Steel Locknuts with External-Tooth Lock Washer
These metric locknuts have a free-spinning tooth lock washer that grips the material surface instead of threads for easy installation and mild vibration resistance.
Stainless Steel Locknuts withExternal-Tooth Lock Washer
These stainless steel locknuts have good chemical resistance and may be mildly magnetic.
Metric Stainless Steel Locknutswith External-Tooth Lock Washer
These metric stainless steel locknuts have good chemical resistance and may be mildly magnetic.
Metric Steel Nonmarring Locknutswith Spring-Lock Washer
A conical washer acts as a spring to add tension between the nut and the material surface for easy installation and mild vibration resistance. These metric locknuts have a smooth rim to resist scratching materials when tightened.
Steel Nonmarring Locknuts with Spring-Lock Washer
These locknuts have a curved washer that acts as a spring for easy installation and mild vibration resistance. The smooth rim makes them less likely to scratch materials when tightened than locknuts with a tooth lock washer.
Steel Narrow Locknuts with External-Tooth Lock Washer
Since they’re about 20% narrower, these locknuts work in tight spaces where standard locknuts won’t fit. Also known as Keps and K-Lock nuts, they have a free-spinning tooth lock washer that grips the material surface instead of threads for easy installation and mild vibration resistance.

Distorted-Thread Locknuts

High-Strength Steel Top-Lock Distorted-Thread Locknuts
Comparable in strength to Grade 8 bolts, these locknuts are about 25% stronger than medium-strength steel locknuts.
Metric Medium-Strength Steel Top-LockDistorted-Thread Locknuts—Class 8
These metric locknuts have an irregularly shaped thread at the top of the nut that grips the bolt for a stronger hold than nylon-insert locknuts.
Medium-Strength Steel Top-LockDistorted-Thread Locknuts—Grade 5
These locknuts have an irregularly shaped thread at the top of the nut that grips the bolt for a stronger hold than nylon-insert locknuts.
Low-Strength Steel Top-Lock Distorted-Thread Locknuts
About half the strength of medium-strength steel locknuts, these are for light duty fastening applications, such as securing access panels.
Extreme-Strength Steel Top-LockDistorted-Thread Locknuts
These Grade 9 locknuts are about 20% stronger than high-strength steel locknuts and are often used in heavy machinery, such as earth-moving equipment.
18-8 Stainless Steel Top-Lock Distorted-Thread Locknuts
These locknuts have good chemical resistance.
Super-Corrosion-Resistant 316 StainlessSteel Top-Lock Distorted-Thread Locknuts
More corrosion resistant than 18-8 stainless steel locknuts, these have excellent resistance to chemicals and salt water.
High-Strength Steel Center-LockDistorted-Thread Locknuts—Grade 8
These Grade 8 locknuts are about three times stronger than low-strength steel distorted-thread locknuts.
Left-Hand Threaded High-Strength SteelCenter-Lock Distorted-Thread Locknuts—Grade 8
These locknuts tighten when turned to the left.
Metric Medium-Strength Steel Center-LockDistorted-Thread Locknuts—Class 8
Strong enough for use with most machinery and equipment, these Class 8 metric locknuts have an irregularly shaped thread in the middle of the nut that grips bolts tighter than nylon-insert locknuts.
Low-Strength Steel Center-LockDistorted-Thread Locknuts
Use these locknuts for light duty fastening applications, such as securing access panels.
18-8 Stainless Steel Center-LockDistorted-Thread Locknuts
These locknuts have good chemical resistance.
Super-Corrosion-Resistant 316 StainlessSteel Center-Lock Distorted-Thread Locknuts
More corrosion resistant than 18-8 stainless steel locknuts, these have excellent resistance to chemicals and salt water.

Flex-Top Locknuts for Heavy Vibration

Steel Flex-Top Locknuts for Heavy Vibration
Threads at the top of these locknuts expand to grip the bolt on all sides for a stronger hold than distorted thread locknuts.
Metric Steel Flex-Top Locknuts for Heavy Vibration
Threads at the top of these metric locknuts expand to grip the bolt on all sides for a stronger hold than distorted-thread locknuts.
Mil. Spec. Steel Flex-Top Locknuts for Heavy Vibration
Choose these locknuts for their adherence to strict military standards for material and construction.
Stainless Steel Flex-Top Locknuts for Heavy Vibration
Made from 18-8 stainless steel, these flex top locknuts have good chemical resistance and may be mildly magnetic.
Metric Stainless Steel Flex-TopLocknuts for Heavy Vibration
Made from stainless steel, these metric flex-top locknuts resist chemicals and may be mildly magnetic.
Mil. Spec. Stainless Steel Flex-TopLocknuts for Heavy Vibration
Choose these locknuts for their adherence to strict military standards for material and construction.
Steel Thin Flex-Top Locknuts for Heavy Vibration
Known for their strength, these steel locknuts are cadmium plated to resist corrosion in wet environments.
Stainless Steel Thin Flex-TopLocknuts for Heavy Vibration
Stainless steel locknuts have excellent corrosion resistance in most environments.
Steel Heavy Flex-Top Locknuts for Heavy Vibration
Known for their strength, these steel locknuts are cadmium plated to resist corrosion in wet environments.
Stainless Steel Heavy Flex-TopLocknuts for Heavy Vibration
Stainless steel locknuts have excellent corrosion resistance in most environments.
Thin Heavy Flex-Top Locknuts for Heavy Vibration
About half the height and 10% wider than standard flex-top locknuts, these locknuts are often referred to as thin heavy locknuts. Use them in low-clearance applications or jam one against a heavy hex nut to hold it in place.

Locknuts for use with Cotter Pins

Medium-Strength Steel Locknutsfor use with Cotter Pins—Grade 5
Also known as castle nuts, secure these nuts by inserting a cotter pin or safety wire through the slots and a drilled hole in your bolt for mild loosening resistance.
Metric Medium-Strength Steel Locknutsfor use with Cotter Pins—Class 8
Secure these metric nuts by inserting a cotter pin or safety wire through the slots and a drilled hole in your bolt for mild loosening resistance. Often referred to as castle nuts.
Low-Strength Steel Locknuts for use with Cotter Pins
About half the strength of medium-strength steel locknuts, these are for light duty fastening applications, such as securing access panels.
Stainless Steel Locknuts for use with Cotter Pins
Stainless steel locknuts have excellent corrosion resistance in most environments.

Steel-Insert Locknuts for Extreme Vibration

Metric Steel-Insert Locknutsfor Extreme Vibration—Class 8
The metric steel insert grips the threads and lifts away from the nut body when installed, isolating the insert from the nut's load to resist spinoff caused by vibration.
Steel-Insert Locknuts for Extreme Vibration—Grade 5
When installed, the steel insert grips the threads and lifts away from the nut body, isolating the insert from the nut's load to resist spinoff caused by vibration.
High-Strength Steel Heavy Steel-InsertLocknuts for Extreme Vibration—Grade 8
High-strength steel locknuts are about 25% stronger than medium-strength steel locknuts.
Medium-Strength Steel Heavy Steel-InsertLocknuts for Extreme Vibration—Grade 5
These locknuts are suitable for fastening most machinery and equipment.
Thin Steel-Insert Locknuts for Extreme Vibration
About two-thirds the height of standard steel-insert locknuts, use these locknuts in low-clearance applications or jam one against a hex nut to hold it in place.

Spring-Stop Locknuts

Metric Low-Strength Steel Spring-Stop Locknuts—Class 6
These locknuts, also known as Fuji locknuts, maintain their holding power with reuse longer than nylon-insert locknuts. They have a spring ring that creates tension as you tighten the nut, keeping them in place.
Metric Stainless Steel Spring-Stop Locknuts
For a secure hold where chemicals are a concern, these stainless steel locknuts have a spring that creates tension when tightened. Also known as Fuji locknuts.

Serrated Locknuts

Serrated Locknuts
These locknuts have serrations that grip the material surface instead of the threads for easy installation and mild vibration resistance.

Two-Piece Thread-Clamping Locknuts for Extreme Vibration

Two-Piece Thread-ClampingLocknuts for Extreme Vibration
These locknuts include a two-piece clamp that expands to grip the bolt on all sides and a concave jam nut that clamps the threads onto the bolt for added vibration resistance. They're also known as drake-style nuts.

Locknut Assortments

Nylon-Insert Locknut Assortments
A nylon insert grips threads to resist loosening.
Assortments of Locknuts withExternal-Tooth Lock Washer
Teeth bite into surfaces for easy installation and mild vibration resistance.
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