The PFK series comprises spring-loaded captive panel screws designed for permanent installation in PC boards, with external threads meeting ASME B1.1, 2A and ASME B1.13M, 6g standards. All variants feature a retainer, screw, and spring made of 300 series stainless steel, and a nylon retaining ring with a temperature limit of 200°F (93°C). The PFK-440-84 variant has a #4-40 thread, 0.500 inch screw length, 0.060 inch maximum shank thickness, 0.060 inch minimum sheet thickness, and installs in a 0.265 inch hole. Minimum distance from hole centerline to edge is 0.200 inch. The assembly includes a diagonal knurl for metric identification and a shoulder stop for controlled installation.
Specifications -
Thread Size - - .112-40 (#4-40)
Type - - PFK
Thread Code - - 440
Screw Length Code - - 84
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 - - .500 in
H ± .005 - - .072 in
P ± .025 - - .250 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 - - Fastened
1 The blue plastic retaining rings are a PEM trademark. The temperature limit is 200° F / 93° C.
| PennEngineering® | |
|---|---|
| Product Category | Captive Fasteners |
| Product Number | PFK-440-84-2 |
| Product Name | Captive Screws, Broaching for PC Boards - Unified |
| Captive Fastener Class / Type | Captive Screws |
| Decimal Thread Diameter | 0.1120 inch (2.84 mm) |
| Unified Thread Notation | Unified |
| Shoulder Diameter | 0.0600 inch (1.52 mm) |
