Steel Pan Head Screws
External-Tooth Lock Washer, M4 x 0.7mm Thread, 6mm Long
Locking Type | Lock Washer |
Thread | |
Size | M4 |
Pitch | 0.7 mm |
Direction | Right Hand |
Spacing | Coarse |
Type | Metric |
Fit | Metric Class 6g |
Tip Type | Flat |
Fastener Head Type | Rounded |
Head | |
Style | Pan |
Profile | Standard |
Height | 3.1 mm |
Diameter | 8 mm |
Drive | |
Style | Phillips |
Size | No. 2 |
Tooth Location | External |
Washer | |
Type | Tooth |
Material | Zinc-Plated Steel |
OD | 8.25 mm |
Thickness | 0.6 mm |
Material | Zinc-Plated Steel |
Length | 6 mm |
Threading | Fully Threaded |
Tensile Strength | 60,000 psi |
Specifications Met | ASME B18.13.1M |
Certificate Form | Digital |
Certificate Type | Material Certificate with Traceable Lot Number |
Hardness | Rockwell B73 |
Performance | Vibration Resistant |
System of Measurement | Metric |
Country of Origin | United States |
DFARS Compliance | Specialty Metals COTS-Exempt |
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 | Yes |
Sharp external teeth provide a stronger grip than internal-tooth lock washers during frequent vibration. These screws are less likely to come loose, but the teeth may snag on surrounding objects. Also known as Sems screws, the washer rotates freely but is permanently attached. These screws 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.
Zinc-Plated Steel—A common choice for areas with occasional exposure to moisture.
The information in this 3-D model is provided for reference only.