Knurled Thumb Screw
Hand-tightened knurled head screw for tool-free adjustments.
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 11 variants.
| Code | Diameter (mm) | Length (mm) | Feature | Tolerance | Std |
|---|---|---|---|---|---|
| BAGA-TRT-01 | 8 | 15 | M3 · knurl | 6g | knurled head – hand tightening |
| BAGA-TRT-02 | 8 | 21 | M3 · knurl | 6g | knurled head – long body |
| BAGA-TRT-03 | 10 | 18 | M4 · knurl | 6g | knurled head – hand tightening |
| BAGA-TRT-04 | 10 | 26 | M4 · knurl | 6g | knurled head – long body |
| BAGA-TRT-05 | 12 | 22 | M5 · knurl | 6g | knurled head – hand tightening |
| BAGA-TRT-06 | 12 | 32 | M5 · knurl | 6g | knurled head – long body |
| BAGA-TRT-07 | 15 | 26 | M6 · knurl | 6g | knurled head – hand tightening |
| BAGA-TRT-08 | 15 | 38 | M6 · knurl | 6g | knurled head – long body |
| BAGA-TRT-09 | 18 | 35 | M6 · knurl | 6g | knurled head – stepped neck |
| BAGA-TRT-10 | 18 | 33 | M8 · knurl | 6g | knurled head – hand tightening |
| BAGA-TRT-11 | 18 | 48 | M8 · knurl | 6g | knurled head – long body |
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
Knurled Thumb Screw is a Fasteners family precision-turned on a Goodway SW-20, covering 11 variants — diameters ⌀8–18 mm, lengths 15–48 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 ⌀18 mm bar stock; its longest variant is BAGA-TRT-11 at 48 mm. Besides turning, the family requires thread turning (5 sizes from M3 to M8) and knurling. 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 BAGA-TRT-06: 32 mm long at ⌀12 mm, L/D 2.7. A short, rigid body: what governs the result here is not deflection but diameter tolerance and surface finish.
Variants are machined to 6g tolerance; the smallest is BAGA-TRT-01 (⌀8 mm) and the largest BAGA-TRT-11 (⌀18 mm). The family includes threaded, knurled, multi-step 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?
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