DIN 912304 · 316 · 202
Stainless Steel Socket Head Cap Screw (DIN 912)
Size: M3 – M16
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Product Guide
Stainless Steel Screw — Select the Right Type
Selecting the correct stainless steel screw requires understanding your drive type, head style, thread requirements and operating environment. Accurate Fastners supplies individual stainless steel screws in socket head cap, countersunk, pan head, cheese head and self-tapping variants, with SS 202, SS 304 and SS 316 grades available across the range.
Each screw type serves a specific purpose: socket head cap screws for high-torque applications, countersunk screws for flush finishes, self-tapping screws for sheet metal, and machine screws for tapped holes and nuts. Choose the appropriate standard — DIN 912, DIN 7991, DIN 7981, DIN 7985, DIN 965, DIN 84 or DIN 963 — based on your assembly requirements.
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Stainless Steel Screw Selection Factors
- Drive type
- Hexagon socket for high torque, Phillips for screwdriver compatibility, slotted for flat-blade tools.
- Head style
- Countersunk for flush finish, pan for bearing surface, socket for compact profile, cheese for cylindrical design.
- Thread type
- Self-tapping for sheet metal, machine thread for tapped holes, fully threaded vs. partially threaded.
- Material grade
- SS 304 for general use, SS 316 for chloride environments, SS 202 for cost-sensitive applications.
Featured Stainless Steel Screws
- DIN 7981304 · 316
Stainless Steel Pan Head Self-Tapping Screw (DIN 7981)
Size: M2.9 – M6.3 (ST sizes)
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Screw Type Comparison
Socket Head Cap Screw vs. Machine Screw
Socket head cap screws (DIN 912) use an internal hexagon drive, providing high torque transmission in a compact head profile. They are preferred where limited clearance or high bolt preload is required. Machine screws (DIN 7985, DIN 965) use external drives — Phillips or slotted — and are commonly used in sheet metal, plastics and wood with tapped holes or nuts.
Self-Tapping vs. Machine Screw
Self-tapping screws (DIN 7981, DIN 7982) form their own thread in sheet metal and plastics, eliminating the need for pre-tapping. They are ideal for thin materials where tapping is impractical. Machine screws require pre-tapped holes or nuts and provide more precise thread engagement for permanent assemblies.
Countersunk vs. Pan Head
Countersunk heads (DIN 7991, DIN 965) sit flush with the surface, providing a clean finish and preventing protrusion. They are common in visible assemblies and where a smooth surface is required. Pan heads (DIN 7985) provide a bearing surface and are preferred when head visibility is acceptable or when a larger contact area is beneficial.
Allen vs. Phillips Drive
Allen (hexagon socket) drives resist cam-out and transmit high torque, requiring a hex key or socket driver. They are common in precision machinery and automotive applications. Phillips drives provide good screwdriver compatibility and are widely used in electronics, appliances and general assembly where tool availability is a consideration.
Common Selection Mistakes
- 01Using carbon steel screws in moisture-exposed applications where stainless steel is required
- 02Selecting the wrong thread pitch — coarse vs. fine — for the mating component
- 03Choosing a head style that does not suit the assembly requirements or clearance constraints
- 04Specifying SS 304 for chloride-rich environments where SS 316 would be more appropriate
- 05Using self-tapping screws in thick materials where machine screws with tapped holes would be more suitable
- 06Not confirming the required length including washer and nut engagement depth
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