Coupling / Extension Nut
Long hex coupling nut that axially joins two threaded rods with a through internal thread.
This is a dimension schematic, not a manufacturing drawing. Dimensions match the catalog data; request a quote with the part code to confirm before production.
Code & Size Table
Code, dimensions and tolerance for all 9 variants.
| Code | Diameter (mm) | Length (mm) | Feature | Tolerance | Std |
|---|---|---|---|---|---|
| SOMA-KAP-03 | 6.4 | 12 | SW5.5 · ⌀3 | 6H | M3 through internal thread, DIN 6334 |
| SOMA-KAP-04 | 8.1 | 16 | SW7 · ⌀4 | 6H | M4 through internal thread, DIN 6334 |
| SOMA-KAP-05 | 9.2 | 20 | SW8 · ⌀5 | 6H | M5 through internal thread, DIN 6334 |
| SOMA-KAP-06 | 11.5 | 25 | SW10 · ⌀6 | 6H | M6 through internal thread, DIN 6334 |
| SOMA-KAP-06-L | 11.5 | 50 | SW10 · ⌀6 | 6H | M6 long coupling, custom |
| SOMA-KAP-08 | 15 | 30 | SW13 · ⌀8 | 6H | M8 through internal thread, DIN 6334 |
| SOMA-KAP-08-L | 15 | 60 | SW13 · ⌀8 | 6H | M8 long coupling, custom |
| SOMA-KAP-10 | 19.6 | 40 | SW17 · ⌀10 | 6H | M10 through internal thread, DIN 6334 |
| SOMA-KAP-10-L | 19.6 | 70 | SW17 · ⌀10 | 6H | M10 long coupling, custom |
Prices are for approved members.
Material & Tolerance
The standard material is listed below; also available in steel, stainless, brass and aluminium. Dimensions in mm; tolerances machined to ISO. Deviations (mm) are given for the nominal diameter according to the ISO 286-2 tables; thread tolerances (6g/6H) are to ISO 965. For custom sizes/tolerances, contact us with the part code.
Manufacturing Scope
Coupling / Extension Nut is a Nuts & Adapters family precision-turned on a Goodway SW-20, covering 9 variants — diameters ⌀6.4–19.6 mm, lengths 12–70 mm, standard material Stainless Steel (also steel, brass or aluminium). Every variant's part code, dimension and tolerance is listed below; request a quote with the code you need.
The family is machined from ⌀20 mm bar stock; its longest variant is SOMA-KAP-10-L at 70 mm. Besides turning, the family requires hex flat milling (AF 5.5–17) and axial drilling (⌀3–10 mm). All of it is completed in a single setup, without the part leaving the machine.
The variant with the highest length-to-diameter ratio is SOMA-KAP-06-L: 50 mm long at ⌀11.5 mm, L/D 4.3. This ratio is achievable on a conventional lathe as well; the sliding-head advantage in series work is that the part never leaves the machine, so the size does not drift from variant to variant.
Variants are machined to 6H tolerance; the smallest is SOMA-KAP-03 (⌀6.4 mm) and the largest SOMA-KAP-10-L (⌀19.6 mm). The family includes hex-drive, bored variants. Custom sizes, tolerances or materials are produced to the part code on request.
Need a size that isn't listed? We machine to your drawing — CNC contract machining. How these parts are made: What is a Swiss-type lathe?
Other Families in This Category
Back to categorySimilar Parts in Other Categories
Let Us Create a Solution Tailored to Your Needs
Contact us to discuss your project; let's work out the most suitable solution together.