Stainless Steel Pan Head Screws with Split Lock Washer
4-40 Thread Size, 1/4" Long
Locking Type | Lock Washer |
Thread | |
Size | 4-40 |
Direction | Right Hand |
Spacing | Coarse |
Type | UNC |
Fit | Unified Standard Class 2A |
Tip Type | Flat |
Fastener Head Type | Rounded |
Head | |
Style | Pan |
Profile | Standard |
Height | 0.08" |
Diameter | 0.219" |
Drive | |
Style | Phillips |
Size | No. 1 |
Washer | |
Type | Split |
Material | 410 Stainless Steel |
OD | 0.222" |
Thickness | 0.031" |
Material | 18-8 Stainless Steel |
Length | 1/4" |
Threading | Fully Threaded |
Tensile Strength | 80,000 psi |
Specifications Met | ASME B18.13 |
Hardness | Rockwell B85 |
Passivation | Passivated |
Performance | Corrosion Resistant, Vibration Resistant |
Screw Size Decimal Equivalent | 0.112" |
System of Measurement | Inch |
Country of Origin | Canada, China, Germany, India, Italy, Japan, Mexico, Taiwan, Thailand, United States, Vietnam |
DFARS Compliance | Not Specialty Metals Compliant |
Export Control Classification Number (ECCN) | EAR99 |
REACH Compliance | REACH (EC 1907/2006) (06/25/2025, 250 SVHC) Compliant |
RoHS Compliance | RoHS 3 (2015/863/EU) Compliant |
Schedule B Number | 731815.9000 |
U.S.–Mexico–Canada Agreement (USMCA) Qualifying | No |
Stop screws from loosening due to light vibration when fastening in corrosive environments. These screws have a washer with uneven ends that bite into the screw head and the mating surface as you tighten them. While they're not as vibration resistant as tooth lock washers, they're a good choice for electrical panels, light fixtures, and other light duty assemblies. Also known as Sems screws, the washer rotates freely but is permanently attached. Pan heads have a moderate height and width profile, offering a middle ground between narrower button heads and wider truss heads. The Phillips drive easily aligns with drivers and withstands more torque than slotted drives, but drivers slip when you apply too much force.
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.
The information in this 3-D model is provided for reference only.