Experts in the development and manufacture of precision fasteners,
components and systems, specializing in thin sheet attachment solutions.

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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)



Thread Code

N/A 0420

Screw Length Code

N/A 82

A (Shank) Max.

N/A .060 in a1108.jpg

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

Finish Spring

N/A Natural Finish

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.


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