Socket Head Bolts and Screws
PDM
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Features of Stainless Steel Hex Socket Screw
Socket Head Screw Title:
China Factory galvanized hexagon socket head cap screw ISO 7380 Button Head Screw DIN912 Socket Head Screws
Socket Cap Button Head Screws Core Features:
Socket bolts and screws (DIN912/DIN7991/ISO 7380) are the three most commonly used types of internal hexagonal fasteners in the industrial field, corresponding to three core head shapes: cylindrical head, countersunk head, and pan head. They are widely used in mechanical, automotive, precision equipment, and other scenarios.
Socket Head: The head is cylindrical/countersunk/dome shaped, with a center machined hexagonal inner hole (inner hexagonal drive groove), which is different from the outer hexagonal head fastener.
Bolts vs. Screws：
Socket Head Bolts: with full thread/half thread, used in conjunction with nuts for penetrating fastening (such as mechanical structures, equipment racks).
Socket Head Screws: mostly full threaded, directly screwed into pre made internal threaded holes, used for non penetrating fastening (such as molds, precision components).
Core Processes:
Cold heading forming, CNC precision machining, hexagonal groove precision stamping, heat treatment (quenching/tempering), surface treatment
Hexagon socket head cap screws din912
ISO, etc.: ISO 4762 (coarse teeth), ISO 12474 (fine teeth)
Head features: cylindrical high head, deep hexagonal drive groove, thick wall;
Thread Size: Metric M3-M48
Core advantages: high pre tightening force, anti slip teeth, stable assembly, compatible with hexagonal wrenches;
| d | p | b | dk | K | S | t | |||
| Max | Min | Max | Min | Max | Min | ||||
| M1.4 | 0.3 | 14 | 2.74 | 2.46 | 1.4 | 1.26 | 1.36 | 1.32 | 0.6 |
| M1.6 | 0.35 | 15 | 3.14 | 2.86 | 1.6 | 1.46 | 1.56 | 1.52 | 0.7 |
| M2 | 0.4 | 16 | 3.98 | 3.62 | 2 | 1.86 | 1.56 | 1.52 | 1 |
| M2.5 | 0.45 | 17 | 4.68 | 4.32 | 2.5 | 2.36 | 2.06 | 2.02 | 1.1 |
| M3 | 0.5 | 18 | 5.68 | 5.32 | 3 | 2.86 | 2.58 | 2.52 | 1.3 |
| M4 | 0.7 | 20 | 7.22 | 6.78 | 4 | 3.82 | 3.08 | 3.02 | 2 |
| M5 | 0.8 | 22 | 8.72 | 8.28 | 5 | 4.82 | 4.095 | 4.02 | 2.5 |
| M6 | 1 | 24 | 10.22 | 9.78 | 6 | 5.7 | 5.14 | 5.02 | 3 |
| M8 | 1.25/1 | 28 | 13.27 | 12.73 | 8 | 7.64 | 6.14 | 6.02 | 4 |
| M10 | 1.5/1.25/1 | 32 | 16.27 | 15.73 | 10 | 9.64 | 8.175 | 8.025 | 5 |
| M12 | 1.75/1.5/1.25 | 36 | 18.27 | 17.73 | 12 | 11.57 | 10.18 | 10.025 | 6 |
| M14 | 2/1.5 | 40 | 21.33 | 20.67 | 14 | 12.57 | 12.21 | 12.032 | 7 |
| M16 | 2/1.5 | 44 | 24.33 | 23.67 | 16 | 15.57 | 14.21 | 14.032 | 8 |
| M18 | 2.5/2/1.5 | 48 | 27.33 | 26.67 | 18 | 17.57 | 14.21 | 14.032 | 9 |
| M20 | 2.5/2/1.5 | 52 | 30.33 | 29.67 | 20 | 19.48 | 17.23 | 17.05 | 10 |
| M22 | 2.5/2/1.5 | 56 | 33.39 | 32.61 | 22 | 21.48 | 17.23 | 17.05 | 11 |
| M24 | 3/2 | 60 | 36.39 | 65.61 | 24 | 23.48 | 19.28 | 19.065 | 12 |
| M27 | 3/2 | 66 | 40.39 | 39.61 | 27 | 26.48 | 19.28 | 19.065 | 13.5 |
| M30 | 3.5/2 | 72 | 45.39 | 44.61 | 30 | 29.48 | 22.28 | 22.065 | 15.5 |
| M33 | 3.5/2 | 78 | 50.39 | 49.61 | 33 | 32.38 | 24.28 | 24.065 | 18 |
| M36 | 4/3 | 84 | 54.46 | 53.24 | 36 | 35.38 | 27.28 | 27.065 | 19 |
| M42 | 4.5/3 | 96 | 63.46 | 62.54 | 42 | 41.38 | 32.33 | 32.08 | 24 |
| M48 | 5/3 | 108 | 72.46 | 71.54 | 48 | 47.38 | 36.33 | 36.08 | 28 |
| M56 | 5.5/4 | 124 | 84.54 | 83.46 | 56 | 56.26 | 41.33 | 41.08 | 34 |
| M64 | 6/4 | 140 | 96.54 | 95.46 | 64 | 63.26 | 46.33 | 46.08 | 38 |
| M72*4 | 6/4 | 156 | 108.5 | 107.5 | 72 | 71.26 | 55.4 | 55.1 | 43 |
| M80*4 | 6/4 | 172 | 120.5 | 119.5 | 80 | 79.26 | 65.4 | 65.1 | 48 |
| M90*4 | 6/4 | 192 | 135.6 | 134.4 | 90 | 89.13 | 75.4 | 75.1 | 54 |
| M100*4 | 6/4 | 212 | 150.6 | 149.4 | 100 | 99.13 | 85.47 | 85.12 | 60 |
Hexagon socket countersunk head screws DIN7991
ISO Equivalent: ISO 10642
Head features: 90 ° countersunk head, completely flush with the workpiece surface after installation, without protrusions;
Core advantages: low profile, beautiful, scratch resistant, suitable for precision assembly that requires a flat surface;
Installation requirements: The workpiece needs to be pre machined with countersink holes;
Material:Stainless steel (SS304; SS316; SS316L; A2-70; A4-80) ,Carbon Steel(Grade 8.8&10.9&12.9),etc.
Standard:DIN, BSW, JIS, UNC, UNF, ASME and ANSI, Non-standard, Customized Drawing.
Thread:Metric Coarse, Metric Fine, UNC, UNF, BSW, BSF.
Size:M3-M42, 1/4 to 2 inches, length: 5mm-300mm
Finish:Plaining,Zinc Plated,Chrome Plated,Nickel Plating,Black Oxide,Anodized,etc.
Application:Various Industries (Furniture,Constructions,General Industry,Heavy Duty,etc)
| d | p | b | dk max | e min | k max | s | t |
| M3 | 0.5 | 12 | 6.0 | 2.3 | 1.7 | 2.0 | 1.2 |
| M4 | 0.7 | 14 | 8.0 | 2.9 | 2.3 | 2.5 | 1.8 |
| M5 | 0.8 | 16 | 10 | 3.4 | 2.8 | 3.0 | 2.3 |
| M6 | 1.0 | 18 | 12 | 4.6 | 3.3 | 4.0 | 2.5 |
| M8 | 1.25 | 22 | 16 | 5.7 | 4.4 | 5.0 | 3.5 |
| M10 | 1.5 | 26 | 20 | 6.9 | 5.5 | 6.0 | 4.4 |
| M12 | 1.75 | 30 | 24 | 9.2 | 6.5 | 8.0 | 4.6 |
| M16 | 2.0 | 38 | 30 | 11.4 | 7.5 | 10 | 5.3 |
| M20 | 2.5 | 46 | 36 | 13.7 | 8.5 | 12 | 5.9 |
Hexagon socket button head screws ISO 7380-1
Performance characteristics: The head has a large load-bearing area, but the drive slot is shallow and the load-bearing capacity is lower than DIN912;
Core advantages: Beautiful appearance, anti hooking, low stress concentration, suitable for exterior parts, light load precision assembly;
Item:Button Head Hex Drive Screws
Material:Stainless steel,steel,Brass,Aluminum,Alloy Steel,etc
Thread Size:M2-M20 or Customized
Thread Length:2-120mm or Customized
Surface Threatment:BZP,YZP,WZP,HDG,Zinc Plating,Black Oxide,Dacromet Coating,etc
Grade:Carbon Steel(4.8/8.8/10.9/12.9),Stainless Steel (A2-70,A4-80),etc
Standard:DIN,ASME,GB,ISO 7380-1,JIS,ANSI,etc
Head Style:Hex,Headless,Rounded,Socket,etc
Thread Type:Fully Threaded,Partially Threaded,etc
| d | p | dk | k | s | t | |||
| Max | Min | Max | Min | Max | Min | Min | ||
| M2 | 0.4 | 3.8 | 3.5 | 1.8 | 1.5 | - | - | - |
| M2.5 | 0.45 | 4.6 | 4.1 | 1.9 | 1.5 | - | - | - |
| M3 | 0.5 | 5.7 | 5.4 | 1.65 | 1.4 | 2.045 | 2.02 | 1.04 |
| M4 | 0.7 | 7.6 | 7.24 | 2.2 | 1.95 | 2.56 | 2.52 | 1.3 |
| M5 | 0.8 | 9.5 | 9.14 | 2.75 | 2.5 | 3.071 | 3.02 | 1.56 |
| M6 | 1 | 10.5 | 10.07 | 3.3 | 3 | 4.084 | 4.02 | 2.08 |
| M8 | 1.25 | 14 | 13.57 | 4.4 | 4.1 | 5.084 | 5.02 | 2.6 |
| M10 | 1.5 | 17.5 | 17.07 | 5.5 | 5.2 | 6.095 | 6.02 | 3.12 |
| M12 | 1.75 | 21 | 20.48 | 6.6 | 6.24 | 8.115 | 8.025 | 4.16 |
| M16 | 2 | 28 | 27.48 | 8.8 | 8.44 | 10.115 | 10.025 | 5.2 |
ISO 7380-2 Button Head Screw with Collar
Item:Flanged Button Head Hex Drive Screws
Material:Stainless steel,steel,Brass,Aluminum,Alloy Steel,etc
Thread Size:M3-M16 or Customized
Thread Length:6-60mm or Customized
Surface Threatment:BZP,YZP,WZP,HDG,Zinc Plating,Black Oxide,Dacromet Coating,etc
Grade:Carbon Steel(4.8/8.8/10.9/12.9),Stainless Steel (A2-70,A4-80),etc
Standard:DIN,ASME,GB,ISO 7380-2,JIS,ANSI,etc
Head Style:Hex,Headless,Rounded,Socket,Flanged,etc
Thread Type:Fully Threaded,Partially Threaded,etc
| Size(d) | Q max (mm) | K max (mm) | SW (mm) | d1 max (mm) |
| M3 | 0.7 | 1.65 | 2.0 | 6.9 |
| M4 | 0.8 | 2.2 | 2.5 | 9.4 |
| M5 | 1.0 | 2.75 | 3.0 | 11.8 |
| M6 | 1.2 | 3.3 | 4.0 | 13.6 |
| M8 | 1.5 | 4.4 | 5.0 | 17.8 |
| M10 | 2.0 | 5.5 | 6.0 | 21.9 |
| M12 | 2.4 | 6.6 | 8.0 | 26 |
| M16 | 2.8 | 8.8 | 10 | 34 |
Applications:
Mechanical manufacturing: machine tools, molds, engineering machinery, automation equipment.
Automotive industry: engine, chassis, gearbox, interior.
Electronics/3C: mobile phones, computers, instruments, servers.
Aerospace: spacecraft, satellites (titanium alloy/12.9 grade, lightweight+ultra-high strength).
Medical/Food: Surgical instruments, food processing equipment (stainless steel, hygienic+corrosion-resistant).
Molds/fixtures: injection molds, stamping molds, tooling fixtures (high torque+repeated disassembly and assembly).
Notes:
Select according to head shape: High strength required → DIN912; Need to be level → DIN7991; Need to be aesthetically pleasing and scratch resistant → ISO7380
Anti loosening measures: In heavy load/vibration scenarios, use flat pads, spring pads, and thread glue to enhance anti loosening performance.
Thread matching: M thread is used for metric system, UNC/UNF is used for American system, ensuring consistent tooth profile/pitch.
Select by strength level: choose 10.9/12.9 level for heavy load; Choose stainless steel 304/316 for light load/anti-corrosion.
Select according to specifications:metric M2-M36, length/thread length customized according to assembly requirements.
According to the standard selection: DIN/ISO/ANSI/GB are interchangeable to ensure supply chain consistency.
