Part # AES31KB331, Countersunk Head Threaded Insert - Closed End Keyed - Unified On Aero-Space Fasteners and Electronics, Inc.

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Designed for high load applications. Countersunk feature allow fastener to be installed flush with sheet surface.
Both UNC and UNF threads available in No. 10 and larger thread sizes. Check for availability of other grip ranges and designs.

Unit of Measure

Thread Size	N/A 5/16-18
Grip Range	N/A .256 - .331 in
Identification Mark	N/A 2 Rad.
B Ref.	N/A .656 in
C Max.	N/A .104 in
øD + .000 - .004	N/A .413 in
E Max.	N/A .505 in
F + .005 -.000	N/A .120 in
L ± .015¹	N/A 1.406 in
K Ref.	N/A .550 in
P - Keyway Width + .003 -.000	N/A .128 in
H - Keyway Height	N/A .097 - .102 in
Install Drill Size Ref.	N/A Z
Install Hole Size Min.	N/A .413 in
Install Hole Size Max.	N/A .423 in
Pull Up Factor	N/A .120 in
Weight per 1000	N/A 30.5 lb
Fastening	N/A Uninstalled
Thread Specification	N/A 3B per ASME B1.1
Standard Material	N/A Low Carbon Steel
Standard Finish	N/A Cadmium Plate - .0003” minimum thickness per SAE AMS-QQ-P-416 Class 2, Type II
CAD Supplier	N/A PennEngineering® (Atlas®)

¹ The “L” dimension is the height of the installed stud at max grip. The height of the stud will increase if it is installed into thinner material. To calculate “actual L” use this formula: max grip - actual grip + L = “actual L”

Thread Size