Mil. Spec. 18-8 Stainless Steel Phillips Flat Head Screws
100 Degree Countersink Angle, 8-32 Thread Size, 5/16" Long







Thread Direction | Right Hand |
Drive Style | Phillips |
Tip Type | Flat |
Thread Size | 8-32 |
Length | 5/16" |
Countersink Angle | 100° |
Flat Head Profile | Standard |
Head | |
Diameter | 0.332" |
Height | 0.072" |
Threading | Fully Threaded |
Tensile Strength | 70,000 psi |
Specifications Met | SAE AMS2700 |
Military Specification | Fed. Spec. FF-S-92, Fed. Spec. QQ-P-35, MS24693-47B, NASM24693 |
Certification | Mil. Spec. |
Drive Size | No. 2 |
Fastener Head Type | Flat |
Hardness | Rockwell B70 |
Material | Black-Oxide 18-8 Stainless Steel |
Performance | Corrosion Resistant |
Screw Size Decimal Equivalent | 0.164" |
System of Measurement | Inch |
Thread Fit | Unified Standard Class 2A |
Thread Spacing | Coarse |
Thread Type | UNC |
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) (11/07/2024, 242 SVHC) Compliant |
RoHS Compliance | RoHS 3 (2015/863/EU) Compliant |
Schedule B Number | 731815.9000 |
U.S.–Mexico–Canada Agreement (USMCA) Qualifying | Yes |
These screws are made of stainless steel, so they won't rust or corrode when exposed to moisture and chemicals. The Phillips drive has a cross-shaped opening in which a driver fits snugly for easy alignment. With four contact points, they withstand more torque than slotted drives, but drivers slip when you apply too much force.
Length is measured from the top of the head.
Black-Oxide 18-8 Stainless Steel—Typically chosen for their appearance, these screws have a dark, matte coating to create a finished look. They won't rust in wet and outdoor environments, but they don't hold up to the harsh chemicals that 316 stainless steel can.
Standard Profile—Standard-profile heads are the most common choice for flat head screws.
Military Specification—These screws are manufactured and tested to meet strict U.S. military standards for material and construction.
The information in this 3-D model is provided for reference only.




























