Part # AER31B256, Countersunk Head Threaded Insert - Closed End Keyless - Unified On Aero-Space Fasteners and Electronics, Inc.

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All Categories > ATLAS® Brand Rivet Nuts > Atlas MaxTite® Rivet Nuts > Countersunk Head > Countersunk Head Threaded Insert - Closed End Keyless - Unified > Part # AER31B256

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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

Specifications

Thread Size	N/A 5/16-18
Grip Range	N/A .181 - .256 in
Identification Mark	N/A 1 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
J Ref.	N/A .935 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 29.7 lb
Fastening	N/A Installed
Thread Specification	N/A 3B per ASME B1.1
Standard Material	N/A Alloy No. 260 Brass
Standard Finish	N/A None - bright as machined
CAD Supplier	N/A PennEngineering® (Atlas®)