ISO turning toolholders and boring bars
ISO turning holders, boring bars and threading toolholders from the UK — external, internal, grooving and parting.
Galtona's Turning Toolholder range covers external turning, internal turning (boring bars), threading, grooving, and parting applications, built to the ISO clamping-system code standard (top clamping, top-and-hole clamping, wedge clamping, lever clamping, and screw clamping), with a full matrix of insert shapes, approach angles, clearance angles, hand orientations, shank sizes, and tool lengths.
External turning spans steel, ceramic, and Swiss-type toolholder families across all 6 ISO clamping systems. Internal turning boring bars (steel or carbide shank, with or without internal coolant) cover Ø8–60 mm. Threading holders (SER/SEL external, SIR/SIL internal) are manufactured with a 1.5° helix angle, matched to thread pitch and diameter via angled shims.
Grooving toolholders are manufactured from 44 HRc hardened tool steel with smooth surfaces and precise insert-pocket dimensions produced after heat treatment, for improved insert contact and tensile strength. Parting blades are hardened to 55 HRc, with parallelism held to ±0.03 mm over 150 mm length and flatness within 0.05 mm, for accurate, repeatable cuts.
Internal threading toolholder (SIR)
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.