Stainless Steel Tamper-Resistant One-Way Round Head Screws
1/4"-20 Thread Size, 1/2" Long
Thread | |
Size | 1/4"-20 |
Direction | Right Hand |
Spacing | Coarse |
Type | UNC |
Fit | Unified Standard Class 2A |
Tip Type | Flat |
Fastener Head Type | Rounded |
Head | |
Style | Round |
Profile | Standard |
Height | 0.175" |
Diameter | 0.472" |
Drive Style | One Way |
Length | 1/2" |
Threading | Fully Threaded |
Tensile Strength | 80,000 psi |
Hardness | Rockwell B96 |
Material | 18-8 Stainless Steel |
Passivation | Passivated |
Performance | Corrosion Resistant, Tamper Resistant |
Screw Size Decimal Equivalent | 0.250" |
System of Measurement | Inch |
Country of Origin | United States |
DFARS Compliance | Specialty Metals Compliant (252.225-7009) |
Export Control Classification Number (ECCN) | EAR99 |
REACH Compliance | REACH (EC 1907/2006) (01/21/2025, 247 SVHC) Compliant |
RoHS Compliance | RoHS 3 (2015/863/EU) Compliant |
Schedule B Number | 731815.9000 |
U.S.–Mexico–Canada Agreement (USMCA) Qualifying | Yes |
Related Product |
Install these tamper-resistant screws in corrosive environments with a common slotted driver. Once installed, the drive’s sloped walls cause drivers to slip, making these screws difficult to remove without one-way screw removers. They're often found on public facilities, such as restroom partitions and other long-term installations, where tamper resistance is important and removal for maintenance is unlikely.
Length is measured from under the head.
18-8 Stainless Steel—The choice for wet and outdoor environments, these screws won't rust. However, they don't hold up to the harsh chemicals that 316 stainless steel can.
One-Way Screw Removers—Extract one-way screws. With two pins on the driver's end, they grip one-way screws to loosen them when slotted drivers just slip.
The information in this 3-D model is provided for reference only.