PEM® brand miniature fasteners fit into a minimal space and provide strong, reusable threads.
Types FE, FEO and UL are self-locking. Types FE and FEO thread locking torque performance is equivalent to applicable NASM25027 specifications. Ty
Unit of Measure
Specifications
Thread Size
N/A.250-28 (1/4-28)
Thread Type
N/ANon-Locking
Thread Code
N/A0428
A (Shank) Max.
N/A.060 in
Sheet Thickness1
N/A.059 to .070 in
Hole Size in Sheet + .003 - .000
N/A.344 in
C + .000 - .005
N/A.343 in
D Max.
N/A.318 in
E ± .005
N/A.384 in
T + .015 -.000
N/A.120 in
Min. Dist. Hole C/L to Edge
N/A.28 in
Max. Hole in Attached Parts
N/A.270 in
For Use in Sheet Hardness2
N/AHRB 70 / HB 125 or Less
Thread Specification
N/AInternal, ANSI B1.1, 2B
Fastener Material
N/A300 Series Stainless Steel
Standard Finish
N/APassivated and/or tested per ASTM A380
CAD Supplier
N/APennEngineering® (PEM®)
1 In applications between the sheet thicknesses for your thread size, see last paragraph of installation data on page FE-6. Knurled collar may
fracture if fastener is used in sheets thicker than the specified range and the screw is tightened beyond maximum tightening torque.