System of Measurement
Hex Nut Profile
Thread Direction
Flange Diameter
0.167"
11/64"
13/64"
0.206"
15/64"
0.244"
9/32"
0.29"
0.33"
11/32"
3/8"
25/64"
13/32"
0.42"
27/64"
0.422"
7/16"
15/32"
0.469"
0.49"
0.5"
1/2"
0.52"
17/32"
0.54"
0.56"
9/16"
37/64"
19/32"
0.594"
0.62"
5/8"
41/64"
43/64"
0.675"
0.68"
11/16"
45/64"
0.708"
47/64"
0.75"
3/4"
0.784"
0.81"
13/16"
0.814"
53/64"
7/8"
59/64"
0.93"
15/16"
31/32"
1"
1 1/64"
1.016"
1.031"
1 1/32"
1 1/16"
1.07"
1 1/8"
1 3/16"
1 13/64"
1 1/4"
1 9/32"
1 21/64"
1.33"
1 3/8"
1 15/32"
1 1/2"
1 37/64"
1.585"
1 5/8"
1 11/16"
1 3/4"
2"
2 1/16"
2 1/4"
2 1/2"
8 mm
10 mm
10.2 mm
10.5 mm
11 mm
11.2 mm
11.8 mm
12 mm
13.6 mm
14 mm
14.2 mm
14.25 mm
15 mm
15.6 mm
15.9 mm
16 mm
17.5 mm
17.8 mm
17.9 mm
18 mm
18.2 mm
18.25 mm
19 mm
19.1 mm
20.7 mm
20.9 mm
21 mm
21.8 mm
22 mm
22.2 mm
23.5 mm
25 mm
26 mm
27 mm
28 mm
28.6 mm
29.9 mm
31 mm
33 mm
34 mm
34.5 mm
34.9 mm
37 mm
40 mm
42.8 mm
44.5 mm
45 mm
49 mm
50.8 mm
51 mm
58 mm
68 mm
Product Categories Nuts / Flange Nuts

Flange Nuts

776 Products

Serrated Flange Locknuts

Medium-Strength Steel SerratedFlange Locknuts—Grade 5
These flange locknuts have serrations that grip the material surface instead of the threads for easy installation and mild vibration resistance.
Metric Medium-Strength SteelSerrated Flange Locknuts—Class 8
Strong enough for use in most machinery and equipment, these medium-strength metric nuts have serrations on the underside of the flange. The serrations prevent the nuts from loosening in applications with mild vibration.
High-Strength Steel Serrated Flange Locknuts—Grade 8
These nuts are about 25% stronger than medium-strength steel flange locknuts.
Metric High-Strength Steel SerratedFlange Locknuts—Class 10
They're about 25% stronger than medium-strength steel flange locknuts and comparable in strength to Class 10.9 bolts.
Low-Strength Steel Serrated Flange Locknuts
About half the strength of medium-strength steel flange locknuts, these are for light duty fastening applications, such as securing access panels.
18-8 Stainless Steel Serrated Flange Locknuts
Made from 18-8 stainless steel, these flange locknuts have good chemical resistance and may be mildly magnetic
Metric 18-8 Stainless Steel Serrated Flange Locknuts
Metric 18-8 stainless steel is also known as A2 stainless steel. These flange locknuts have good chemical resistance and may be mildly magnetic.
Super-Corrosion-Resistant 316 StainlessSteel Serrated Flange Locknuts
These flange locknuts have excellent resistance to chemicals and salt water.
Metric Super-Corrosion-Resistant 316Stainless Steel Serrated Flange Locknuts
Metric 316 stainless steel is also known as A4 stainless steel. These flange locknuts have excellent resistance to chemicals and salt water.
Brass Serrated Flange Locknuts
Made from brass, these flange locknuts are corrosion resistant in wet environments, electrically conductive, and nonmagnetic. They’re easy to install and resist mild vibration since serrations grip the material surface instead of the threads

Nylon-Insert Flange Locknuts

Medium-Strength Steel Nylon-InsertFlange Locknuts—Grade F
Grade F nuts are comparable in strength to Grade 5 bolts.
Metric Medium-Strength SteelNylon-Insert Flange Locknuts—Class 8
Metric High-Strength Steel Nylon-InsertFlange Locknuts—Class 10
High-Strength Steel Nylon-InsertFlange Locknuts—Grade G
Grade G nuts are comparable in strength to Grade 8 bolts.
Stainless Steel Nylon-Insert Flange Locknuts
Metric Stainless Steel Nylon-Insert Flange Locknuts

Distorted-Thread Flange Locknuts

High-Strength Steel Distorted-Thread Flange Locknuts
These flange locknuts are comparable in strength to Grade 8 bolts.
Metric High-Strength Steel Distorted-ThreadFlange Locknuts—Class 10
Grip metric bolts more securely than nylon-insert flange locknuts—the irregularly shaped threads on these locknuts hold extra tight. They resist vibration and sudden shocks, even after multiple uses.
Mil. Spec. Low-Strength SteelDistorted-Thread Flange Locknuts
Choose these flange locknuts for their adherence to strict military standards for material and construction.
Medium-Strength Steel Distorted-ThreadFlange Locknuts—Grade 5
For a stronger hold than nylon-insert flange locknuts, these locknuts grip the bolt with an irregularly shaped thread. Made from Grade 5 steel, these locknuts are a good choice for fastening most machinery and equipment.
Metric Medium-Strength SteelDistorted-Thread Flange Locknuts—Class 8
Stainless Steel Distorted-Thread Flange Locknuts
These flange locknuts have excellent resistance to chemicals and salt water. They have an irregularly shaped thread that grips the bolt for a stronger hold than nylon-insert flange locknuts.

Thread-Forming Flange Locknuts

Thread-Forming Flange Locknuts
These nylon flange locknuts form threads as they're tightened to resist vibration.

Flange Nuts

High-Strength Steel Flange Nuts—Grade 8
Made from Grade 8 steel, these nuts are about 25% stronger than medium-strength steel flange nuts.
Metric High-Strength Steel Flange Nuts—Class 10
Also known as collar nuts, these metric nuts have a flange that distributes pressure across the surface, so you don't need a washer. Made of high-strength Class 10 steel, they’re about 25% stronger than medium-strength steel flange nuts.
JIS High-Strength Steel Flange Nuts
These metric nuts meet JIS (Japanese Industrial Standard) B 1190.
Metric Medium-Strength Steel Flange Nuts—Class 8
No need for a washer—these metric medium-strength steel nuts have a flange that distributes pressure across its surface the way a washer does. Made of medium-strength, Class 8 steel, they’re suitable for fastening most machinery and equipment.
Medium-Strength Steel Flange Nuts
These Grade 5 flange nuts are suitable for fastening most machinery and equipment.
JIS Medium-Strength Steel Flange Nuts
Made to Japanese Industrial Standards, these nuts fasten most Japanese machinery and equipment without a washer.
Low-Strength Steel Flange Nuts
About half the strength of medium-strength steel flange nuts, use these nuts in light duty fastening applications, such as securing access panels.
Metric Low-Strength Steel Flange Nuts
About half the strength of medium-strength steel flange nuts, use these metric nuts in light duty fastening applications, such as securing access panels.
18-8 Stainless Steel Flange Nuts
Made from 18-8 stainless steel, these flange nuts have good chemical resistance.
Metric 18-8 Stainless Steel Flange Nuts
Skip the washer—these metric stainless steel nuts have a flange that does the same job, spreading pressure across its surface for a strong hold.
Super-Corrosion-Resistant 316Stainless Steel Flange Nuts
More corrosion resistant than 18-8 stainless steel flange nuts, these nuts have excellent resistance to chemicals and salt water.
Fiberglass Flange Nuts
Fiberglass flange nuts are chemical resistant, nonconductive, and lightweight.

High-Torque 12-Point Flange Nuts

Steel High-Torque 12-Point Flange Nuts
These flange nuts have a black-oxide finish for mild corrosion resistance in dry environments.
Stainless Steel High-Torque 12-Point Flange Nuts
Stainless steel nuts have excellent corrosion resistance in most environments.

Rotating Flange Nuts

Rotating Flange Nuts
The nut head rotates while the flange remains stationary to prevent scratching the material surface as you tighten the nut.

Leveling Flange Nuts

Steel Leveling Flange Nuts
These flange nuts have a black-oxide finish for mild corrosion resistance in dry environments.
Stainless Steel Leveling Flange Nuts
Stainless steel nuts have excellent corrosion resistance in most environments.

Thread-Repairing Flange Nuts

Thread-Repairing Flange Nuts
Combine the utility of a thread-cutting die with a flange nut. These nuts repair damaged threads and cut through rust, residue, and weld spatter as you thread them while the flange distributes pressure on the material surface, eliminating the need for a separate washer.
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