ISO Metric Fine · M10×1
M10×1 Thread — Dimensions, Tap Drill & Clearance
https://shopmath.org/threads/metric-fine/m10x1 · data verified August 1, 2026
The tap drill for M10×1 is 9 mm — 0.3543 in (9.000 mm) — which leaves 77.0% thread engagement with a cut tap. Basic pitch diameter is 0.3681 in (9.350 mm) and basic minor diameter is 0.3511 in (8.917 mm). Tapped-hole figures on this page assume a class 6H thread; drill sizes for 50–85% engagement are in the tap drill table below.
- Series
- ISO Metric Fine
- Designation
- M10×1
- Pitch
- 1.000 mm
- Standard
- ISO 68-1, ISO 261, ISO 262, ISO 965-1, ISO 898-1
Tap drill · 77.0% thread · cut tap
9 mm
- Drill Ø
- 0.3543in
- Drill Ø
- 9.000mm
- Clearance (normal)
- 10.9 mm
Assumes 75% thread engagement with a cut tap and a class 6H hole. That drill actually leaves 77.0% thread.
Basic Thread Dimensions for M10×1
| Property | Inch | Millimetre |
|---|---|---|
| Basic major diameter | 0.3937 | 10.000 |
| Pitch | 0.0394 | 1.000 |
| Basic pitch diameter | 0.3681 | 9.350 |
| Basic minor diameter | 0.3511 | 8.917 |
| External thread root diameter | 0.3454 | 8.773 |
| Sharp V thread height (H) | 0.0341 | 0.866 |
Basic dimensions are the theoretical values before any tolerance class is applied.
Tap Drill Sizes for M10×1
Cut taps, from 50% to 85% thread engagement. The shop default is 75% — a 9 mm drill. Deeper engagement means more holding strength and more torque on the tap.
| Property | Target hole Ø | Nearest standard drill | Property | |||
|---|---|---|---|---|---|---|
| Thread % | in | mm | Drill | in | mm | Actual thread % |
| 50% | 0.3681 | 9.350 | 9.4 mm | 0.3701 | 9.400 | 46.2 |
| 60% | 0.3630 | 9.221 | 9.2 mm | 0.3622 | 9.200 | 61.6 |
| 65% | 0.3605 | 9.156 | 9.2 mm | 0.3622 | 9.200 | 61.6 |
| 70% | 0.3579 | 9.091 | 9.1 mm | 0.3583 | 9.100 | 69.3 |
| 75%default | 0.3553 | 9.026 | 9 mm | 0.3543 | 9.000 | 77.0 |
| 80% | 0.3528 | 8.961 | 9 mm | 0.3543 | 9.000 | 77.0 |
| 85% | 0.3502 | 8.896 | 8.9 mm | 0.3504 | 8.900 | 84.7 |
Target hole Ø is the theoretical hole for the stated engagement. The drill column is the nearest size in the standard number/letter/fractional/metric index, and actual thread % is what that real drill produces — the number that matters at the machine. Values are for cut taps. Tapped-hole figures assume a class 6H hole.
Clearance Hole Sizes for M10×1
The through-hole a M10×1 fastener passes freely, not the tapped hole.
| Property | Property | Hole Ø | Property | |
|---|---|---|---|---|
| Fit | Drill | in | mm | Use |
| Close | 10.4 mm | 0.4134 | 10.500 | Located joints, dowelled assemblies |
| Normal | 10.9 mm | 0.4331 | 11.000 | General assembly — the default |
| Loose | 11.9 mm | 0.4724 | 12.000 | Slotted or adjustable joints, weldments |
Clearance holes per ISO 273 (metric) and ASME B18.2.8 (inch). The drill column is the nearest standard drill at or above the specified hole diameter.
Thread Class Limits for M10×1
Manufacturing limits for classes 6H. A gauge reading outside these bands is a reject, not a judgement call.
| Property | Class 6H | |
|---|---|---|
| Limit | in | mm |
| Major Ø min | 0.3937 | 10.000 |
| Pitch Ø max | 0.3740 | 9.500 |
| Pitch Ø min | 0.3681 | 9.350 |
| Pitch Ø tolerance | — | 0.150 |
| Minor Ø max | 0.3604 | 9.153 |
| Minor Ø min | 0.3511 | 8.917 |
Tensile Stress Area of M10×1
The effective cross-section used to size a M10×1 fastener against a load. Multiply it by the material's allowable stress — the area itself carries no strength assumption.
| Property | in² | mm² |
|---|---|---|
| Tensile stress area | 0.09997 | 64.49 |
The formula this value comes from is in the sources section below.
Sources and Method for M10×1
- Basic dimensionscomputed+compiled
ISO 68-1 basic profile and ISO 898-1 tensile stress area; verified in docs/research/data-sourcing.md §3.2; diameter/pitch pairs: ISO 261 / ISO 262 diameter-pitch pairs via Wikipedia (CC BY-SA 4.0); cross-checked against threadlib metric_thread.csv (BSD-3) and FreeCAD CAM metric-internal-6H.csv (LGPL-2.1+); clearance holes: ISO 273 (metric) and ASME B18.2.8 (inch) via FreeCAD FeatureHole.cpp (LGPL-2.1+), cross-checked against bd_warehouse clearance_hole_sizes.csv (Apache-2.0)
Verified against threadlib metric_thread.csv (BSD-3-Clause) and FreeCAD CAM metric-internal-6H.csv (LGPL-2.1+), agreeing cell-for-cell — 215 checks passed at 0.001 mm
Part computed from the standard's formulas, part compiled from agreeing public sources.
- Tap drill sizescomputed
Machinery's Handbook %-thread formula (geometry-derived); nearest-standard-drill-to-75% rule verified at 36/39 published chart rows in docs/research/data-sourcing.md §3.4
Verified against D-P rule verified as exactly the 77.0% thread case
Computed from the standard's formulas, then checked against published tables.
- Class limitscompiled
threadlib metric_thread.csv (BSD-3-Clause) and FreeCAD CAM metric-internal-6H.csv (LGPL-2.1+), agreeing cell-for-cell
Verified against two independent published datasets agreeing cell-for-cell to 0.001 mm; ISO 965-1 formulas not located, so these are compiled not computed
Compiled from independent public sources that agree cell-for-cell.
- Formula
Tap drill hole diameter, metric threads
hole Ø = D − (%thread ÷ 100) × 1.29904 × P D = basic major diameter (mm) P = pitch (mm)
1.29904 = 2 × 0.64952, twice the engaged thread height per side on the 60° ISO profile.
Actual thread engagement of the chosen drill
%thread = (D − drill Ø) ÷ (1.29904 × P) × 100
The drill column rounds to a real drill; this is the engagement that drill actually leaves.
Tensile stress area, ISO metric threads
As = (π ÷ 4) × ((d₂ + d₃) ÷ 2)² d₂ = basic pitch diameter d₃ = external thread root diameter
ISO 898-1 form, evaluated on unrounded intermediates — recomputing it from the rounded diameters shown above lands within 0.01%.
- Assumptions
- The headline tap drill assumes 75% thread engagement, the general shop default. Every other engagement from 50% to 85% is in the tap drill table — change the assumption and the number moves.
- Tap drill figures are for cut taps. Drill diameters are nominal; a worn or run-out drill cuts oversize and reduces engagement further.
- Tapped-hole figures assume a class 6H internal thread, the general-purpose fit.
- Dataset scope: EXCLUDED: ISO 965-1 tolerance-grade formulas (not located — data-sourcing.md open item 2), 6g external limits (single-sourced), form tap drills, M68-M100 (verified demand cliff at M64).
- Data last verified
- August 1, 2026
How to Cite This M10×1 Reference
Citation
ShopMath. "M10×1 Thread — Dimensions, Tap Drill & Clearance." ShopMath, verified August 1, 2026, https://shopmath.org/threads/metric-fine/m10x1
BibTeX
@misc{shopmath-threads-metric-fine-m10x1,
title = {M10×1 Thread — Dimensions, Tap Drill & Clearance},
author = {{ShopMath}},
year = {2026},
howpublished = {\url{https://shopmath.org/threads/metric-fine/m10x1}},
note = {Data verified 2026-08-01}
}Permanent URL
https://shopmath.org/threads/metric-fine/m10x1
Common Questions About M10×1
What is the tap drill size for M10×1?
- The tap drill for M10×1 is 9 mm — 0.3543 in (9.000 mm). That leaves 77.0% thread engagement with a cut tap.
What is the pitch diameter of M10×1?
- The basic pitch diameter of M10×1 is 0.3681 in (9.350 mm). For a class 6H thread it runs 0.3681 in (9.350 mm) to 0.3740 in (9.500 mm).
What is the minor diameter of M10×1?
- The basic minor diameter of M10×1 is 0.3511 in (8.917 mm). That is the theoretical root of the internal thread, not the drilled hole size — see the tap drill table for the hole to drill.
What is the thread pitch of M10×1?
- M10×1 has a pitch of 1.000 mm, the distance from one thread crest to the next.
What size clearance hole does a M10×1 fastener need?
- close fit 10.4 mm (0.4134 in (10.500 mm)), normal fit 10.9 mm (0.4331 in (11.000 mm)), loose fit 11.9 mm (0.4724 in (12.000 mm)). The normal fit is the general-assembly default.
What is the tensile stress area of M10×1?
- The tensile stress area of M10×1 is 0.09997 in² (64.49 mm²). Multiply it by the fastener material's allowable stress to get a load.