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AN365 Nylock Hex Nut (MS20365)

These are Military specification versions of what is commonly referred to as a "Nylock" or nylon locking nut. These cad-plated steel nuts are rated at 125,000 psi tensile strength and for operating temperatures of up to 250° F. The AN365 series is the standard, full height lock nut. The AN365 specification is equivalent to the MS20365 and newer MS21044 specification (except AN365-7*). Sold individually.

AN365 Lock Nut Specifications
UNF Thread Size	Wrench Size	Thickness (Max)	Part No.
10-32	3/8"	0.250"	AN365-3
1/4-28	7/16"	0.328"	AN365-4
5/16-24	1/2"	0.350"	AN365-5
3/8-24	9/16"	0.469"	AN365-6
7/16-20	5/8"	0.469"	AN365-7*
1/2-20	3/4"	0.610"	AN365-8
9/16-18	7/8"	0.705"	AN365-9
5/8-18	15/16"	0.766"	AN365-10
3/4-16	1 1/16"	0.821"	AN365-12
* The MS21044-7 spec calls out a larger 11/16" hex. The 5/8" hex on these AN365-7 nuts matches the hex size of AN316-7 non-locking jam nuts, AN310-7 castle nuts, and AN7 bolt heads.

Reusing Nylon Locking Nuts
The FAA has issued guidelines on the reuse of nylon locking nuts. Specific recommendations have been published for larger sizes (7/16-20 and up), but the general rule is that you should not be able to turn the nut by hand once the locking insert engages the male threads. If you can turn the nut with your fingers, it must be replaced. When in doubt, replace!

Note: AN and MS specs do not cover the color of the nylon locking insert. We cannot control or otherwise guarantee the colors used from lot to lot.

Enter desired order quantities below, then click the "Add selected quantities to cart" button.

Order Qty

Part No.

Desc.

Price

Status

AN365-3
Condition: New
SKU: 31136

10-32 Nylock Hex Nut, AN365

1 to 11: $0.27 12 to 149: $0.25 150 & up: $0.23

In Stock

AN365-4
Condition: New
SKU: 31137

1/4-28 Nylock Hex Nut, AN365

1 to 11: $0.47 12 to 149: $0.42 150 & up: $0.36

In Stock

AN365-5
Condition: New
SKU: 31138

5/16-24 Nylock Hex Nut, AN365

1 to 11: $0.89 12 to 149: $0.79 150 & up: $0.68

In Stock

AN365-6
Condition: New
SKU: 31139

3/8-24 Nylock Hex Nut, AN365

1 to 11: $0.99 12 to 149: $0.88 150 & up: $0.77

In Stock

AN365-7
Condition: New
SKU: 31140

7/16-20 Nylock Hex Nut, AN365

1 to 9: $1.49 10 to 99: $1.32 100 & up: $1.15

In Stock

AN365-8
Condition: New
SKU: 31141

1/2-20 Nylock Hex Nut, AN365

1 to 9: $1.99 10 to 99: $1.80 100 & up: $1.60

In Stock

AN365-9
Condition: New
SKU: 41055

9/16-18 Nylock Hex Nut, AN365

1 to 9: $2.39 10 & up: $2.13

In Stock

AN365-10
Condition: New
SKU: 31142

5/8-18 Nylock Hex Nut, AN365

1 to 9: $2.49 10 to 99: $2.24 100 & up: $1.98

In Stock

AN365-12
Condition: New
SKU: 31143

3/4-16 Nylock Hex Nut, AN365

1 to 7: $5.69 8 to 59: $5.21 60 & up: $4.72

In Stock

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AN365 Nylock Hex Nut (MS20365)

Order Qty

Part No.

Desc.

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Status

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Related Product Groups

Airframe (AN) & Mil-Spec (MS) Nuts

AN and MS Nuts, AN and MS Washers, and AN Bolts