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Phillips and Pozi drives came out under high torque. Protruding heads snag, interfere with fit, and look unfinished. These A2 304 stainless steel countersunk flat head hex socket machine screws solve both problems: the internal hex (Allen) drive handles high torque without cam-out, and the 82° countersunk head sits flush with or below the surface for a clean, professional finish. Available in UNC and UNF thread sizes from #2-56 to 5/16-18, in lengths from 3/16” (4.8mm) to 2” (50.8mm).
Made from A2 (304) stainless steel for reliable corrosion resistance without the weight or cost of larger fasteners. The 82° countersunk head angle is the US standard for flat head machine screws, compatible with standard US countersunk holes. Pack sizes of 10, 20, 50, and 100 pieces let you order exactly what you need.
Typical applications include electronics enclosure and panel mounting where a flush surface is required, precision instrument and optical equipment fastening, PC and server chassis assembly (#6-32, #8-32), structural panel and bracket mounting (1/4-20, 5/16-18), and replacement screws for US-standard equipment specifying countersunk hex socket fasteners.
| Material | A2 Stainless Steel (304 / 18-8) |
|---|---|
| Finish | Natural stainless (no coating) |
| Thread Standard | Unified Thread Standard (UNC / UNF) |
| Thread Sizes | #2-56 UNC, #4-40 UNC, #6-32 UNC, #8-32 UNC, #10-24 UNC, 1/4-20 UNC, 5/16-18 UNC |
| Head Style | Countersunk Flat Head (82° angle — US standard) |
| Drive Type | Hex (Allen) Socket — 0.05” / 1/16” / 5/64” / 3/32” / 1/8” / 3/16” / 1/4” |
| Available Lengths | 3/16” (4.8mm), 1/4” (6.4mm), 5/16” (7.9mm), 3/8” (9.5mm), 1/2” (12.7mm), 5/8” (15.9mm), 3/4” (19.1mm), 7/8” (22.2mm), 1” (25.4mm), 1-1/4” (31.8mm), 1-1/2” (38.1mm), 1-3/4” (44.5mm), 2” (50.8mm) |
| Length Measurement | Including head (total length — US standard for countersunk) |
| Pack Sizes | 10 / 20 / 50 / 100 pcs |
| Screw Type | Machine screw (requires tapped hole or nut) |
| Corrosion Resistance | Excellent — suitable for indoor and light outdoor use |
| Common Applications | Electronics enclosures, panel mounting, PC chassis, precision instruments, structural brackets, equipment repair |
For countersunk screws, length is measured including the head (total length). The screw should sit flush with or just below the surface when fully driven into a properly countersunk hole at 82°. Available lengths: 3/16” (4.8mm) to 2” (50.8mm). Not all lengths are available for every thread size — check the size selector. When in doubt, size up.
A countersunk (flat head) hex socket screw combines a tapered head that sits flush with the surface with an internal hex (Allen) drive. The flush head eliminates snag points; the hex drive allows high torque application without cam-out — a significant advantage over Phillips or Pozi drives in precision and structural applications.
Allen (hex) key sizes by thread size: #2-56 = 0.05”, #4-40 = 1/16”, #6-32 = 5/64”, #8-32 = 3/32”, #10-24 = 1/8”, 1/4-20 = 3/16”, 5/16-18 = 1/4”. Use a quality hex key or Allen driver bit. A worn or undersized key can round out the socket, especially on smaller sizes.
A2 is the most common grade of austenitic stainless steel, equivalent to 304 or 18-8 stainless. It offers excellent corrosion resistance, is non-magnetic in most conditions, and is the standard material for general-purpose stainless fasteners in electronics, fixtures, and light outdoor use.
A2 stainless steel provides strong corrosion resistance and will not rust under normal indoor conditions or light outdoor exposure. For marine, coastal, or highly corrosive environments, A4 (316) stainless is generally recommended. These screws are well-suited for electronics, precision instruments, and sheltered outdoor applications.
Yes. All sizes follow Unified Thread Standard (UTS) specifications and are compatible with standard US tapped holes, nuts, and threaded inserts in the same size and thread pitch. Common pairings: #6-32 for PC cases and electronics, #8-32 for general electronics, 1/4-20 for heavier fixtures and structural applications.
Yes — these are machine screws, not self-tapping. They require a pre-tapped hole or a matching nut in the same thread size and pitch. They will not cut their own thread into plastic or metal.
Available in packs of 10, 20, 50, and 100 pieces. Larger packs offer better per-unit value for workshops and production use. Select your preferred quantity using the QTY option above.
