PennEngineering® Screw Head, Spring-loaded - Unified PFS2-440-40-BN

PFS2 series spring-loaded captive panel screws feature a screw head for tool or hand operation, remain captive during mounting and removal, and are designed for use in thin sheet materials. The assembly includes a 300 series stainless steel screw, 300 series stainless steel spring, and a nylon retaining ring rated to 200°F (93°C). The screw has external threads per ASME B1.1, 2A and ASME B1.13M, 6g. The part is available with a black nitride finish (BN) per AMS2753, Section 3. It installs into sheet material up to 0.060 inch thick with a minimum hole size of 0.060 inch and requires a minimum distance of 0.25 inch from the hole center to the sheet edge. Maximum sheet hardness is HRB 80 or HB 150. The header 440-40 indicates a #4-40 thread size and a 0.250 inch screw length.