Dowel pins with internal thread, ISO 8733: Ø6–Ø50 extraction thread, thread depth, counterbore — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/dowel-pins-internal-thread-iso-8733/  (sheet CC BY 4.0)
Basis: Westfield Fasteners' ISO 8733 table (d1, c1, c2, d2, P, d3, t1, t2, t3), cross-checked against OPAC's ISO 8733 table
Catalog version: 2026-10-20

Sizes: see table below
- Columns: pin diameter d1, thread d2, counterbore d3, thread depth t1, counterbore depth t3, drawn length l. Hardened pins to ISO 8735 use the same d2 per diameter.
- One representative length per diameter is drawn; other lengths change l only. End chamfers c1/c2 (≈ values) are not drawn.

d1  thread  d3  t1  t3  l drawn
6  M4  4.3  6  1  20
8  M5  5.3  8  1.2  25
10  M6  6.4  10  1.2  30
12  M6  6.4  12  1.2  30
16  M8  8.4  16  1.5  40
20  M10  10.5  18  1.5  50
25  M16  17  24  2  60
30  M20  21  30  2  80
40  M20  21  30  2.5  100
50  M24  25  36  2.5  120

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Westfield Fasteners: ISO 8733 extractable dowel pin: d1, c1, c2, d2, P, d3, t1, t2, t3 — web — Publisher's page; dimensions are facts — https://www.westfieldfasteners.co.uk/Standards/Pin-ExtDowel.html
- OPAC: ISO 8733 table — web — Publisher's page; dimensions are facts — https://www.opac.net/en/producto-170-iso-8733
- ISO (iTeh preview): ISO 8735:1997 Table 1, hardened pins with internal thread — web — Publisher's page; dimensions are facts — https://cdn.standards.iteh.ai/samples/21794/5336932a636449df82213642fd4cdca8/ISO-8735-1997.pdf

Free files (CC BY 4.0, Xem Studio; STEP + STL, 10 parts): https://xemstudio.com/files/hardware/dowel-pins-internal-thread-iso-8733/index.json
API: https://xemstudio.com/api/geometry?object=dowel-pins-internal-thread-iso-8733