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PennEngineering
All Categories > PEM® Brand Fasteners for Metal Sheets and Panels > Captive Panel Screws and Hardware > Large Knob, Spring-Loaded – Types PF11, PF11M, PF11MF, PF11MW, PF12, PF12M, PF12MF, PEM C.A.P.S®, PF12MW, PF15, PF15M > Large Knob, Spring-Loaded – Types PF11, PF12 and PF15 > Large knob, spring-loaded – Types PF11, PF12 and PF15 - Unified > Part # PF11-0420-0BL  

Part # PF11-0420-0BL, Large knob, spring-loaded – Types PF11 and PF12 - Unified

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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.




 Specifications   

Thread Size
.250-20 (1/4-20)

Type
Knurled Cap - PF11

Thread Code
0420

Screw Length Code
0

A (Shank) Max.

 View
.036 in

Min. Sheet Thickness
.036 in

Hole Size in Sheet + 0.003 - 0.000
.375 in

C Max.
.374 in

E ± .010
.575 in

G ± .025
.290 in

P ± .025
.000 in

T1 Nom.
.530 in

T2 Nom.
.790 in

Driver Size
Slotted/#3 Phillips

Min. Dist. Hole C/L to Edge
.460 in

Standard Finish
Knob - Black Anodize
Retainer - Bright nickel over copper flash per ASTM B689
Screw - Black nitride, AMS2753, Section 3
Spring - Natural Finish

CAD View
Unfastened

Thread Specification1
ANSI B1.1, 2A

Material Knob
Aluminum

Material Retainer
Heat-Treated Carbon Steel

Material Screw
400 Series Stainless Steel

Material Spring
300 Series Stainless Steel

Finish Knob
Natural Finish

Finish Retainer
Bright Nickel over Copper Flash per ASTM B689

Finish Screw
Passivated and/or tested per ASTM A380

Finish Spring
Natural Finish

For Use in Sheet Hardness
HRB 80 or Less (Hardness Rockwell “B” Scale) / HB 150 or Less (Hardness Brinell)

Optional Finish2
Knob (aluminum) – Black Anodize
Screw (steel and stainless) – Black Nitride

CAD Supplier
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 “BL” suffix will be added to part number to designate DuraBlack™ finish.



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