Part # PF11-0420-0, Large knob, spring-loaded – Types PF11 and PF12 - Unified On Aero-Space Fasteners and Electronics, Inc.

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Shoulder on retainer provides positive stop during installation.
Available in self-clinching, flaring, or floating mounting styles.
Available with knurled or un-knurled metal cap, black metal cap, or a custom color plastic cap.

Unit of Measure

Thread Size	N/A .250-20 (1/4-20)
Type	N/A Knurled Cap - PF11
Thread Code	N/A 0420
Screw Length Code	N/A 0
A (Shank) Max.	N/A .036 in
Min. Sheet Thickness	N/A .036 in
Hole Size in Sheet + 0.003 - 0.000	N/A .375 in
C Max.	N/A .374 in
E ± .010	N/A .575 in
G ± .025	N/A .290 in
P ± .025	N/A .000 in
T1 Nom.	N/A .530 in
T2 Nom.	N/A .790 in
Driver Size	N/A Slotted/#3 Phillips
Min. Dist. Hole C/L to Edge¹	N/A .460 in
Standard Finish	N/A Knob - Natural Finish Retainer - Bright nickel over copper flash per ASTM B689 Screw - Passivated and/or tested per ASTM A380 Spring - Natural Finish
CAD View	N/A Fastened
Thread Specification²	N/A ANSI B1.1, 2A
Material Knob	N/A Aluminum
Material Retainer	N/A Heat-Treated Carbon Steel
Material Screw	N/A 400 Series Stainless Steel
Material Spring	N/A 300 Series Stainless Steel
Finish Knob	N/A Natural Finish
Finish Retainer	N/A Bright Nickel over Copper Flash per ASTM B689
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 80 or Less (Hardness Rockwell “B” Scale) / HB 150 or Less (Hardness Brinell)
CAD Supplier	N/A PennEngineering® (PEM®)

¹ To minimize sheet distortion and maximize product performance, use a centerline-to-edge value greater or equal to the value specified.
² 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

Thread Size