PARAMETRIC · 3D · STEP / STL / 3MF
Hex Head Screw M12 × 30HEXAGON HEAD SCREW
Free STEP, STL and 3MF download of a hex head screw M12 × 30 with live 3D preview. Key dimensions: Pitch 1.75 mm, Pitch diameter 10.863 mm, Minor diameter 9.853 mm, Tap drill 10.20 mm. Every parameter stays adjustable, and you can send it straight to Orinovate for printing.
- StandardISO 4017 (full thread)
- SizesM3–M16
- Chamfer30°
- OutputSTEP · STL · 3MF · DXF
LIVE · HEXAGON HEAD SCREW
M12 × 30
SCALE 1:1 · mm
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CALCULATED · SPEC
AUTO-COMPUTED
P
1.75mm
Pitch
d2
10.863mm
Pitch diameter
d3
9.853mm
Minor diameter
⌀
10.20mm
Tap drill
dh
13 / 13.5mm
Clearance hole (fine / medium)
s
18.0mm
Width across flats
e
20.03mm
Width across corners
k
7.50mm
Head height
b
30.0mm
Thread length
L
37.50mm
Overall length (incl. head)
As
84.27mm²
Tensile stress area
Fm
67.4kN
Min. tensile load (class 8.8)
HOW-TO
How to generate a hex head screw STEP / STL file
- 1Pick the thread size — head dimensions follow the standard automatically.
- 2Enter the length or tap a common length.
- 3Choose the thread mode: simplified for assemblies, modeled to see the thread, 3D-print for printing.
- 4Check the spec cards and any warnings.
- 5Download STEP, STL or 3MF — or send it to Orinovate for a quote.
What is a hex head screw (ISO 4017)?
Hex head screws are driven by a spanner or socket and take high torque, so they are the default bolt for structures, machinery and general assembly. ISO 4017 is fully threaded, with head height k ≈ 0.6–0.7d, a 30° chamfer on the top of the head and width across corners e ≈ 1.15s. The spec card lists the standard minimum e; the model uses the theoretical s / cos 30°.
ISO metric thread formulas
The ISO 68-1 basic profile is a 60° triangle with fundamental height H = 0.866P. Pitch diameter d2 = d − 0.6495P, internal minor D1 = d − 1.0825P, external minor d3 = d − 1.2269P, tensile stress area As = π/4 × ((d2 + d3)/2)². For M8 (P = 1.25): d2 = 7.188, D1 = 6.647, d3 = 6.466 mm, As = 36.6 mm². Modeled threads are right-handed and faceted into 36 planar segments per turn (error < 0.4 % of the diameter).
Specs at default parameters
| Parameter | Value | Range |
|---|---|---|
| Thread size (d) | M12 | M3 / M4 / M5 / M6 / M8 / M10 / M12 / M14 / M16 |
| Length (l) | 30 mm | 1–200 |
| Thread mode | Simplified (no thread) | Simplified (no thread) / Modeled thread / 3D-print thread |
| Print clearance (c) | 0.15 mm | 0.05–0.5 |
| Pitch (P) | 1.75 mm | — |
| Pitch diameter (d2) | 10.863 mm | — |
| Minor diameter (d3) | 9.853 mm | — |
| Tap drill (⌀) | 10.20 mm | — |
| Clearance hole (fine / medium) (dh) | 13 / 13.5 mm | — |
| Width across flats (s) | 18.0 mm | — |
| Width across corners (e) | 20.03 mm | — |
| Head height (k) | 7.50 mm | — |
| Thread length (b) | 30.0 mm | — |
| Overall length (incl. head) (L) | 37.50 mm | — |
| Tensile stress area (As) | 84.27 mm² | — |
| Min. tensile load (class 8.8) (Fm) | 67.4 kN | — |
Popular hex head screw sizes
FAQ
What spanner fits an M8 hex bolt? ISO vs DIN?
The spanner size is the width across flats s: M5 8, M6 10, M8 13, M10 16, M12 18, M14 21, M16 24 mm (ISO 4017). Older DIN 933 / JIS use 17 for M10, 19 for M12 and 22 for M14 — check the standard when ordering.
ISO 4017 or ISO 4014?
ISO 4017 is threaded right up to the head — good for short screws and full-length clamping. ISO 4014 has a plain shank under the head, which is stronger in shear and works as a locating pin or pivot. This generator makes the fully threaded ISO 4017 version.
What size hole for an M3 screw? Which tap drill?
Tap drill ≈ nominal diameter − pitch: M3 → 2.5 mm, M4 → 3.3, M5 → 4.2, M6 → 5.0, M8 → 6.8, M10 → 8.5, M12 → 10.2 mm. For a clearance hole (ISO 273): M3 3.2 (fine) / 3.4 (medium), M4 4.3 / 4.5, M5 5.3 / 5.5, M6 6.4 / 6.6, M8 8.4 / 9 mm. The spec cards list both for the selected size.
What do property classes 8.8, 10.9 and 12.9 mean?
Per ISO 898-1 the first number × 100 is the nominal tensile strength in MPa and the product of both numbers × 10 the nominal yield strength. The specified minimums are slightly higher: 8.8 (d ≤ 16) = 800 / 640 MPa, 10.9 = 1040 / 940 MPa, 12.9 = 1220 / 1100 MPa. Socket cap screws are usually 12.9, general hex bolts 8.8. Minimum breaking load = tensile strength × stress area As; the spec cards show it for class 8.8.
Do 3D-printed threads work?
Yes, from about M6 up — a 0.4 mm FDM nozzle can barely resolve an M3 thread (0.5 mm pitch). Use the 3D-print mode (external thread shrunk 0.15 mm, internal enlarged 0.2 mm, adjustable), print screws standing up with ≤ 0.12 mm layers. For parts that are assembled often or loaded, heat-set inserts or a captive hex-nut pocket last far longer than printed threads.
Which software opens the hex head screw STEP file?
STEP (AP214) opens in Fusion 360, SolidWorks, FreeCAD, Onshape and Rhino. STL / 3MF import directly into Bambu Studio, PrusaSlicer or Cura.
Is it free?
Yes — no sign-up, no fees. Need a physical part? Send it to Orinovate for an instant quote in FDM, SLA, SLS, MJF or CNC.
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About STEP / STL / 3MF / DXF
- STEP (.step / .stp, AP214) keeps exact dimensions and surfaces for editing in Fusion 360, SolidWorks or FreeCAD.
- STL and 3MF are triangle meshes that import directly into Bambu Studio, PrusaSlicer or Cura.
- DXF is the top-view 2D outline, ready for laser cutting, waterjet or CNC routing.
- All models are in millimetres at true scale.