The PFK-440-40 is a spring-loaded broaching captive panel screw designed for permanent installation in printed circuit boards. It has a .112-40 thread size and is constructed with a 300 series stainless steel retainer, screw, and spring, with a nylon retaining ring rated to 200°F (93°C). The assembly features a diagonal knurl for metric thread identification and a shoulder stop for controlled installation. Maximum shank length is 0.060 inch, minimum sheet thickness is 0.060 inch, minimum hole size is 0.265 inch, and minimum distance from hole centerline to edge is 0.200 inch. All components are passivated and tested per ASTM A380. The screw is intended for use in sheet materials with hardness of HRB 70 or less or HB 125 or less.
Specifications -
Thread Size - - .112-40 (#4-40)
Type - - PFK
Thread Code - - 440
Screw Length Code - - 40
A (Shank) Max. - - .060 in
Min. Sheet Thickness - - .060 in
Hole Size in Sheet + 0.003 - 0.000 - - .265 in
C ± .003 - - .283 in
E ± .010 - - .312 in
G ± .016 - - .250 in
H ± .005 - - .072 in
P ± .025 - - .000 in
T1 Max. - - .360 in
T2 Nom. - - .540 in
Min. Dist. Hole C/L to Edge - - .200 in
Thread Specification - - ANSI B1.1, 2A
Material Retainer1 - - 300 Series Stainless Steel
Material Screw - - 300 Series Stainless Steel
Material Spring - - 300 Series Stainless Steel
Finish Retainer - - Passivated and/or tested per ASTM A380
Finish Screw - - Passivated and/or tested per ASTM A380
For Use in Sheet Hardness - - HRB 70 or less (Hardness Rockwell “B” Scale) /HB 125 or less (Hardness Brinell)
CAD View - - Unfastened
1 The blue plastic retaining rings are a PEM trademark. The temperature limit is 200° F / 93° C.
| PennEngineering® | bisco industries | |
|---|---|---|
| Product Category | Captive Fasteners | Captive Fasteners |
| Product Number | PFK-440-40 | PFK-440-40 |
| Product Name | Captive Screws, Broaching for PC Boards - Unified | Captive Screws |
| Captive Fastener Class / Type | Captive Screws | Captive Screws |
| Decimal Thread Diameter | 0.1120 inch (2.84 mm) | |
| Unified Thread Notation | Unified | Unified |
| Shoulder Diameter | 0.0600 inch (1.52 mm) |
