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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 1/4-20
Grip Range	N/A .331 - .391 in
Identification Mark	N/A 4 Rad.
B Ref.	N/A .529 in
C Max.	N/A .089 in
øD + .000 - .004	N/A .332 in
E Max.	N/A .382 in
F + .005 -.000	N/A .054 in
L ± .015¹	N/A 1.25 in
K Ref.	N/A .435 in
P - Keyway Width + .003 -.000	N/A .062 in
H - Keyway Height	N/A .056 - .058 in
Install Drill Size Ref.	N/A Q
Install Hole Size Min.	N/A .332 in
Install Hole Size Max.	N/A .338 in
Pull Up Factor	N/A .095 in
Weight per 1000	N/A 17.5 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®)
Inventory	N/A {0}

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”

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