Threading Toolholders
Threading Toolholders
External (SER/SEL) and internal (SIR/SIL) threading holders, 1.5° helix angle.
Galtona threading toolholders are manufactured with a 1.5° helix angle. Resultant helix angle is determined by thread pitch and diameter (β° = 20×P/D) and matched via angled shims — from 0° (standard shim, AL53/AL54) up to 4.5°. Internal bars (SIR right-hand, SIL left-hand) share the same shank system as the boring-bar range; external holders (SER, SEL) use the same approach-angle and clamping conventions as external turning holders.
SIR — representative sizes (internal, right-hand)
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| Code No | d | L1 | L2 | f | D | Insert |
|---|---|---|---|---|---|---|
| S10H SIR 11 | 10 | 100 | 25 | 7.4 | 13 | 11 IR.. |
| S16M SIR 11 | 16 | 150 | 32 | 10 | 18 | 11 IR.. |
| S20Q SIR 16 | 20 | 180 | 42 | 15 | 25 | 16 IR.. |
| S25R SIR 16 | 25 | 200 | 50 | 18 | 30 | 16 IR.. |
| S32S SIR 22 | 32 | 250 | 52 | 21.6 | 38 | 22 IR.. |
| S40T SIR 22 | 40 | 300 | 60 | 25.8 | 46 | 22 IR.. |
SIL — representative sizes (internal, left-hand)
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| Code No | d | L1 | L2 | f | D | Insert |
|---|---|---|---|---|---|---|
| S10H SIL 11 | 10 | 100 | 25 | 7.4 | 13 | 11 IL.. |
| S16M SIL 11 | 16 | 150 | 32 | 10 | 18 | 11 IL.. |
| S20Q SIL 16 | 20 | 180 | 42 | 15 | 25 | 16 IL.. |
| S25R SIL 16 | 25 | 200 | 50 | 18 | 30 | 16 IL.. |
| S32S SIL 22 | 32 | 250 | 52 | 21.6 | 38 | 22 IL.. |
| S40T SIL 22 | 40 | 300 | 60 | 25.8 | 46 | 22 IL.. |
Full SER/SEL external threading dimension tables available on request — same shank-height/tool-length breakpoints as the external turning range.