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  • Available in steel or stainless steel.
  • Meets “operator access area” requirements similar to UL 508.
  • Tool or finger operation.
  • Most sizes available in three screw lengths.
  • Unit of Measure

    Thread Size

    N/A .250-20 (1/4-20)


    N/A PFC2

    Thread Code

    N/A 0420

    Screw Length Code

    N/A 82

    A (Shank) Max.

    N/A .060 in

    Min. Sheet Thickness

    N/A .060 in

    Hole Size in Sheet + 0.003 - 0.000

    N/A .413 in

    C Max.

    N/A .412 in

    E ± .010

    N/A .468 in

    G ± .016

    N/A .500 in

    H ± .005

    N/A .097 in

    P ± .025

    N/A .125 in

    T1 Max.

    N/A .580 in

    T2 Nom.

    N/A .880 in

    Min. Dist. Hole C/L to Edge

    N/A .38 in
    Thread Specification1 N/A ANSI B1.1, 2A
    Material Retainer2 N/A 300 Series Stainless Steel

    Material Screw

    N/A 300 Series Stainless Steel

    Material Spring

    N/A 300 Series Stainless Steel

    Finish Retainer

    N/A Passivated and/or tested per ASTM A380

    Finish Screw

    N/A Passivated and/or tested per ASTM A380

    For Use in Sheet Hardness

    N/A HRB 70 or Less (Hardness Rockwell “B” Scale) / HB 125 or Less (Hardness Brinell)

    CAD View

    N/A Fastened

    CAD Supplier

    N/A PennEngineering® (PEM®)
    • 1 As with all external plated threads, Class 2A/6g, the maximum major and pitch, after plating, may equal basic sizes and be gauged to Class 3A/4h, per ANSI B1.1, Section 8, Table 3A and ANSI B1.13M, Section 8, Paragraph 8.2.
    • 2 The blue plastic retaining rings are a PEM trademark. The temperature limit is 200° F / 93° C.