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MS21042 Jetnut, All Metal Locknut

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MS21042 Jetnuts (Kaynuts) are all-metal, self-locking nuts. They are rated at 160,000 psi tensile strength and can withstand temperatures to 450°F. Because of their reduced hex dimension, they are widely used in limited space applications where wrench access is a problem. These are the latest "B-Spec" version, with a thicker flange for better resistance to stripping. Sold individually.

Jetnuts are also lighter than AN365 Nylon Lock Nuts (an average of 63% lighter for -3 through -6 sizes). Replacing all of the AN365 nuts on your racecar with MS21042 jetnuts can result in a measurable weight savings!

MS21042 Specifications
Dash No. SAE Thread Hex Size* Outside
Diameter
Height
(Max)
L04** 4-40 5/32" 0.206" 0.125"
06 6-32 3/16" 0.244" 0.141"
08 8-32 7/32" 0.290" 0.188"
3 10-32 1/4" 0.330" 0.188"
4 1/4-28 5/16" 0.420" 0.219"
5 5/16-24 3/8" 0.520" 0.266"
6 3/8-24 7/16" 0.620" 0.282"
7 7/16-20 1/2" 0.708" 0.328"
8 1/2-20 9/16" 0.814" 0.410"
L10** 5/8-18 3/4" 1.014" 0.550"


* The hex is typically deformed to produce the self-locking action. An unused nut may appear to have one hex dimension smaller than the others before installation.

** The -04 (4-40) and -10 (5/8-18) sizes are currently supplied with a moly lubricant coating on top of the yellow plating to prevent galling. All other sizes are uncoated.

Reusing Locking Nuts
The FAA has issued guidelines on the reuse of 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 portion engages the male threads. If you can turn the nut with your fingers, it must be replaced. When in doubt, replace!

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

Order Qty
Part No.
Desc.
Price
Status

MS21042-04
Condition: New

4-40 Jetnut, All Metal Locknut

1 to 11: $0.79

12 to 149: $0.70

150 & up: $0.60

In Stock

MS21042-06
Condition: New

6-32 Jetnut, All Metal Locknut

1 to 11: $0.35

12 to 149: $0.31

150 & up: $0.26

In Stock

MS21042-08
Condition: New

8-32 Jetnut, All Metal Locknut

1 to 11: $0.35

12 to 149: $0.31

150 to 1999: $0.26

2000 & up: call   

In Stock

MS21042-3
Condition: New

10-32 Jetnut, All Metal Locknut

1 to 11: $0.20

12 to 149: $0.19

150 to 1999: $0.17

2000 & up: call   

In Stock

MS21042-4
Condition: New

1/4-28 Jetnut, All Metal Locknut

1 to 11: $0.64

12 to 149: $0.57

150 to 1999: $0.49

2000 & up: call   

In Stock

MS21042-5
Condition: New

5/16-24 Jetnut, All Metal Locknut

1 to 11: $0.79

12 to 149: $0.70

150 to 1999: $0.60

2000 & up: call   

In Stock

MS21042-6
Condition: New

3/8-24 Jetnut, All Metal Locknut

1 to 11: $0.99

12 to 149: $0.91

150 & up: $0.82

In Stock

MS21042-7
Condition: New

7/16-20 Jetnut, All Metal Locknut

1 to 7: $3.59

8 to 59: $3.22

60 & up: $2.84

In Stock

MS21042-8
Condition: New

1/2-20 Jetnut, All Metal Locknut

1 to 7: $4.99

8 to 59: $4.52

60 to 499: $4.05

500 & up: call   

In Stock

MS21042-10
Condition: New

5/8-18 Jetnut, All Metal Locknut, Moly Coated

1 to 5: $21.79

6 to 35: $19.84

36 & up: $17.89

In Stock