Tamper-Resistant Tri-Groove Rounded Head Screws
1/4"-20 Thread Size, 1" Long
Thread | |
Size | 1/4"-20 |
Direction | Right Hand |
Spacing | Coarse |
Type | UNC |
Fit | Unified Standard Class 3A |
Tip Type | Flat |
Fastener Head Type | Rounded |
Head | |
Style | Round |
Profile | High |
Height | 0.155" |
Diameter | 0.375" |
Drive | |
Style | Tri-Groove |
Size | No. 10 |
Material | Zinc-Plated Steel |
Length | 1" |
Threading | Fully Threaded |
Tensile Strength | 80,000 psi |
Hardness | Rockwell C28 |
Performance | Tamper Resistant |
Screw Size Decimal Equivalent | 0.250" |
System of Measurement | Inch |
Country of Origin | United States |
DFARS Compliance | Specialty Metals COTS-Exempt |
Export Control Classification Number (ECCN) | EAR99 |
REACH Compliance | Not Compliant |
RoHS Compliance | Not Compliant |
Schedule B Number | 731815.9000 |
U.S.–Mexico–Canada Agreement (USMCA) Qualifying | No |
Related Product |
Good luck trying to force off these screws. The tri-groove drive has a sloped shape with three notches that makes it nearly impossible to grip without a tri-groove driver. They're often found on electrical boxes, machine control panels, and critical equipment where unauthorized access is a concern.
Length is measured from under the head.
Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.
Power Tool Bits—Pair these bits with your power tools to turn screws more quickly than manual tools.
The information in this 3-D model is provided for reference only.