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Part number reflects steel, open-end, non-keyed, with cadmium yellow plating only.

Please refer to the part numbering system above for further configurations.

All dimensions below are in inches.
Unit of Measure

NAS Part Number

 N/A NAS1330S4E-391

Thread Size

 N/A 1/4-20 UNC-3B

Grip Range
(Min. - Max.)

 N/A .331 - .391

Identifying Mark

 N/A 4 RAD

A
± .015

 N/A 0.937

M
REF

 N/A 0.435

L
± .015 (Closed End Keyless)

 N/A 1.250

J
NOM (Closed End Keyless)

 N/A 0.750

K
NOM (Closed End Keyless)

 N/A 0.435

L
± .015 (Closed End Keyed)

 N/A 1.250

J
NOM (Closed End Keyed)

 N/A 0.750

K
NOM (Closed End Keyed)

 N/A 0.435

ØB
± .015

N/A 0.529

C
NOM

N/A 0.089

ØD
+.000/-.004

 N/A 0.332

Install Drill Size
REF

 N/A Q

Install Hole Size
Min. - Max.

 N/A .332 - .338

E
MAX

N/A 0.382

F
+.005/-.000

 N/A 0.054

P
+.003/-.000

 N/A 0.062

H

 N/A .056 - .058

Pull Up Factor

 N/A .095