Part # AESS31B275, Flathead Threaded Insert - Closed End Keyless - Unified On Aero-Space Fasteners and Electronics, Inc.

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Designed for high load applications. Available with rib, key or full hex features for high torque applications.
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 .200 - .275 in
Identification Mark	N/A 2 Rad.
B ± .015	N/A .665 in Loading zoom
C Nom.	N/A .062 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 1.343 in
K Ref.	N/A .560 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 21.1 lb
Fastening	N/A Uninstalled
Thread Specification	N/A 3B per ASME B1.1
Standard Material	N/A 430 Series Stainless Steel
Standard Finish	N/A Passivated and/or tested per ASTM A380
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