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Printed from Kezuriba (kezuriba.net/en/threads/m10/)

M10×1.5

ISO metric coarse thread

Nominal diameter 10 mm, pitch 1.5 mm. Tap makers recommend slightly different drill sizes, so they are listed side by side.

Tap drill, rule of thumb (d − P)
8.50 mmMaker recommendations below
Minor diameter D1 range (6H)
8.376 – 8.676 mmKeep the hole inside this range[4][5][3]
Pitch diameter d2 (basic)
9.026 mmd2 = d − 0.649519P
M10 basic profile and dimensions (schematic)
external thread (bolt)major dia. d = 10pitch dia. d2 = 9.026minor dia. D1 = 8.3766H range 8.376–8.676 (tap drill target)P = 1.5H160°

Thread angle 60°. H1 (basic thread engagement) = 0.541266P = 0.812. The pitch diameter is where the thread ridge and groove are equally wide. For cutting taps, pick a drill that lands inside the 6H tolerance of the minor diameter D1. Enlarged to show the shape; proportions are not to scale.

⌀Tap drill size for cutting taps (maker recommendations)

For internal thread class 6H. Values as given in each maker’s technical data (mm).

MakerRecommended drillNotesSource
OSG8.5min. 8.38, 6H max. 8.67
previous edition recommended 8.6 (changed in the current edition)		[3]
Nachi (Nachi-Fujikoshi)8.5high-performance drill 8.6[5]
Yamawa8.6[4]
Calculate tapping RPM for this size →

Forming (roll) tap drill sizes differ by maker and product line; see the Japanese page for the table.

⌇Basic dimensions

Nominal (major) diameter d10
Pitch P1.5
Pitch diameter d2, D29.026
Basic minor diameter D1 (nut), d1 (bolt)8.376
Fundamental triangle height H = 0.866025P1.299
Basic engagement H1 = 0.541266P0.812

Basic dimensions are theoretical values without tolerance. Try other pitches with the thread dimension calculator.

⬡Bolt and nut sizes

ItemmmConfidence
Hex bolt width across flats s (ISO-based JIS, main body)16Agrees in 2+ sources[10][11]
Hex bolt width across flats s (old JIS, annex)17Agrees in 2+ sources[12][10]
Hex nut width across flats s (ISO-based JIS, main body)16Agrees in 2+ sources[10][13][14]
Hex nut width across flats s (old JIS, annex)17Agrees in 2+ sources[15][10]
Hex nut height m (style 1, max.)8.4Agrees in 2+ sources[13][14]
Socket head cap screw head diameter dk (max.)16Agrees in 2+ sources[16][17][18][19][20]
Socket head cap screw head height k (max.)10Agrees in 2+ sources[16][18][19][20]
Hex socket size s (hex key size)8Agrees in 2+ sources[16][17][18][19][20][10]
Hex socket depth t (min.)5Agrees in 2+ sources[16][17][18][19][20]

Note: for M10 the ISO-based and old JIS across-flats sizes differ (16 vs 17). Check before choosing a wrench for Japanese hardware.

⊙Clearance holes and counterbores

ItemmmConfidence
Clearance hole d′ for socket head cap screws11Agrees in 2+ sources[16][22]
Counterbore diameter D′ for socket head cap screws17.5Agrees in 2+ sources[16][22]
Counterbore depth H″ (head sits below the surface)10.8Agrees in 2+ sources[16][22]
Counterbore depth H′ (head slightly proud)9.2Agrees in 2+ sources[16][22]
Clearance hole, class 1 (JIS B 1001)10.51 source (reference)[21]
Clearance hole, class 2 (JIS B 1001)111 source (reference)[21]
Clearance hole, class 3 (JIS B 1001)121 source (reference)[21]
Spotface diameter for hex bolts and nuts (JIS B 1001)241 source (reference)[21]

Socket-head values are from the reference table of JIS B 1176; clearance-hole classes are from JIS B 1001. The two standards give different clearance holes for some sizes.

≋M10 fine threads

SizeD1 range (6H)Recommended drill (cutting tap)
M10×1.258.647 – 8.912OSG 8.75 / Nachi (Nachi-Fujikoshi) 8.8 / Yamawa 8.85
M10×18.917 – 9.153OSG 9 / Nachi (Nachi-Fujikoshi) 9 / Yamawa 9.09

📚Sources

Most sources are Japanese technical documents from the tap and fastener makers.

  1. iwata-fa.jp https://www.iwata-fa.jp/contents/assets/pdf/technicaldata/2022_tec_other_13.pdf
  2. nbk1560.com https://www.nbk1560.com/images/ja-JP/product/technical_data/meternezi_NBK/meternezi_NBK_1.…
  3. osg.co.jp https://www.osg.co.jp/media_dl/technical/file/drill_hole_size.pdf
  4. yamawa.com https://www.yamawa.com/Portals/0/images/download/holesize/jp/technical-contents-15.pdf
  5. nachi-fujikoshi.co.jp https://www.nachi-fujikoshi.co.jp/dcms_media/other/2501-12.pdf
  6. osg.co.jp https://www.osg.co.jp/media_dl/technical/file/p_8.pdf
  7. yamawa.com https://www.yamawa.com/Portals/0/images/download/holesize/jp/technical-contents-16.pdf
  8. baer.tools https://baer.tools/en/blog/core-hole-dimensions-for-screw-taps-everything-you-need-to-know
  9. orist.jp https://www.orist.jp/technicalsheet/98015.PDF
  10. eg.aktio.co.jp https://www.eg.aktio.co.jp/wp-content/uploads/R3T_1-5_TONE_bolt_nimen.pdf
  11. jp.misumi-ec.com https://jp.misumi-ec.com/pdf/fa/2015/p1_2367.pdf
  12. tsurugacorp.co.jp https://www.tsurugacorp.co.jp/img/usr/pdf/B00000.pdf
  13. jp.misumi-ec.com https://jp.misumi-ec.com/pdf/fa/2015/p1_2369.pdf
  14. fabory.com https://www.fabory.com/en-GB/p/01103100001
  15. static.nbk1560.com https://static.nbk1560.com/images/ja-JP/product/technical_data/rokkaku_nut_NBK/rokkaku_nut…
  16. jp.misumi-ec.com https://jp.misumi-ec.com/pdf/fa/2015/p1_2363.pdf
  17. tsurugacorp.co.jp https://www.tsurugacorp.co.jp/img/usr/pdf/A00000.pdf
  18. static.nbk1560.com https://static.nbk1560.com/images/ja-JP/product/technical_data/rokkaku_bolt_NBK/rokkaku_bo…
  19. mikipulley.co.jp https://www.mikipulley.co.jp/EN/Services/Tech_data/tech10.html
  20. farnell.com https://www.farnell.com/datasheets/11699.pdf
  21. static.nbk1560.com https://static.nbk1560.com/images/ja-JP/product/technical_data/boltana_zagurikei_NBK/bolta…
  22. nbk1560.com https://www.nbk1560.com/resources/other/article/technical-22-dimensions-of-holes-for-hexag…