Complete ProductCatalog

ER-50 Spring Collet — 6→34mm Range

# ER-50 Spring Collet — ISO 15488 / DIN 6499 (8°) **Universal, high-grip tool holding for mills, lathes, routers & grinders.** ER-50 collets follow the ISO 15488 / DIN 6499 standard (8°) and are compatible with any ER-50 chuck. ## Choose your accuracy * **Standard (≤15 µm TIR)** — dependable everyday accuracy. * **High-Precision (≤8 µm TIR)** — tighter runout for better finish & tool life. * **Ultra-Precision (≤5 µm TIR)** — finishing-grade concentricity; also available as sealed coolant collets in this grade. > **Optional:** With matched premium holders (e.g., balanced G2.5), **system runout** can reach **≤3 µm**. --- ## Pick your inner hole size (ID) **Metric IDs from 6 mm → 34 mm** in 1 mm steps (and 0.5 mm half-steps). Each ER-50 collet normally **collapses ~1 mm** (e.g., 6.0 grips 6.0→5.0 mm). Very small IDs (≈≤3 mm) have a reduced collapse (~0.38 mm). ### Quick size guide (examples) * **6–3 mm**: PCB tools / micro-drills (reduced collapse). * **4–8 mm**: General drilling, light milling. * **34 mm**: Larger drills/end mills within ER-50 envelope; verify tool shank tolerance (h6/H6) for best grip. ### Choosing your size (step-by-step) 1. **Measure the shank** (e.g., **Ø 6.0 mm h6**). 2. Pick the **collet nominal ≥ shank**—*never* clamp above nominal. 3. Prefer the **closest nominal** (e.g., **6.0** for a 6.0 mm shank; not 7.0). 4. Decide **type**: * **Standard** (vented) → **1.0 mm** collapse (better range). * **Sealed** (coolant-through) → **0.5 mm** collapse (keeps chips/coolant out). 5. Pick **accuracy**: **≤15 µm TIR**, **≤8 µm TIR**, **≤5 µm TIR** (collet-only, at bore, 20 °C). --- ## Why machinists choose ER-50 * **Wide clamping range, fewer changeovers.** Each ER collet provides **~1 mm collapse** (commonly 1 mm steps across a set), so a 6 mm ER-50 collet securely clamps 6.0 → 5.0 mm. This minimizes inventory and speeds setups. * **Proven accuracy.** Quality ER collets hold ****≤15 µm TIR** / **≤8 µm TIR** / **≤5 µm TIR**** (collet-only TIR), boosting tool life and surface finish. * **Built for performance.** Made from hardened spring steel and precision-ground for repeatable concentricity and grip. * **Coolant-through options.** Sealed ER-50 collets support through-tool coolant—many rated to **~2000 psi (138 bar)**. * **Universal compatibility.** Fits any **ER-50 collet chuck** (BT, CAT, HSK, straight-shank, etc.); use with **UM/Hex/Mini** nuts (standard **M52×1.5** thread for ER-50). --- ## Key specifications (ER-50) * **Standard**: ISO 15488 / DIN 6499 (ER system, 8° taper) * **Clamping range**: **~1 mm** (per collet), sets typically in **1 mm steps** * **Accuracy grades**: * Standard: **≤15 µm TIR** (collet-only) * High Precision: **≤8 µm TIR** (collet-only) * Ultra Precision: **≤5 µm TIR** (collet-only) * **Shank tolerance**: **h6/H6 recommended** for best performance * **Nut interface**: UM/Hex/Mini; **M52×1.5** (std. ER-50 nut thread) * **Coolant**: Open (standard) or **sealed** (coolant-through) options available; sealed types often rated to **~2000 psi** > **Tip on torque:** Typical recommended tightening torque for ER-50 nuts ranges **150–200 Nm**, varying by nut style (castle/slotted/hex) and tool diameter—always follow your nut/chuck maker's table. --- ## Coolant-through options Select **Sealed (coolant-through)** ER-50 collets to deliver pressure to the tool tip; many are rated **up to ~2000 psi**. Use on-size sealed collets (no collapse) for proper sealing. --- ## What it's great for * High-mix machining where **fast tool swaps** and **wide coverage** matter * **End mills, drills, reamers, routers** (round shanks) in the **6–34 mm** range (typical ER-50 set coverage) * Applications needing **coolant-through** clamping (sealed ER-50) --- ## How to install (for best TIR) 1. **Snap the collet into the nut first** (engage the extractor ring) 2. thread onto the chuck 3. insert clean on-size shank 4. tighten with a torque wrench to your nut/chuck table. Never tighten an empty collet. (Follow your holder's torque chart.) *(Standards & maker docs reference this method to preserve runout.)* --- ## Available nominal sizes (ER-50) **6 → 34 mm (whole & half-steps)** 6, **6.5**, 7, **7.5**, 8, **8.5**, 9, **9.5**, 10, **10.5**, 11, **11.5**, 12, **12.5**, 13... and 42 more sizes > **Clamp bands (examples)** > • **Standard 6.0** → clamps **6.0 → 5.0 mm** > • **Standard 6.5** → **6.5 → 5.5 mm** > • **Sealed 6.0** → **6.0 → 5.5 mm** > • **Sealed 6.5** → **6.5 → 6.0 mm** --- ## Compatibility & fit Works with **ER-50 collet chucks** on **BT/CAT/HSK/straight-shank** holders. Ensure your nut matches ER-50 (**M52×1.5** thread, UM/Hex/Mini styles). For sealed setups, use **sealed collets** (or sealing disks where applicable) and a compatible nut. --- ## Care & best practices * Keep **collet, nut, and taper** spotless; light oil film only—debris hurts TIR. * Match **tool shank tolerance (h6/H6)** for grip and life. * Replace collets that show wear, spring fatigue, or crash damage; accuracy degrades before it's visible. --- ## Technical specifications | Property | Value | | -------------------------------- | ----------------------------------------------------------------------------- | | **Series** | ER-50 | | **Nominal size options** | 6–34 mm (incl. 0.5 steps) | | **Clamp range (Standard)** | nominal → nominal − **1.0 mm** | | **Clamp range (Sealed)** | nominal → nominal − **0.5 mm** | | **Accuracy tiers (collet-only)** | **≤15 µm TIR** · **≤8 µm TIR** · **≤5 µm TIR** *(measured at bore, 20 °C)* | | **Standard** | **ISO 15488 / DIN 6499-B** | | **Material** | **Hardened alloy spring steel**, precision ground *(INOX stainless optional)* | | **Finish** | Ground; optional black oxide | | **Slots** | Multi-slit elastic (ER) | | **Balance grade (typ.)** | G2.5 *(system balance depends on holder/nut)* | | **Max RPM (typ.)** | Holder-limited (see your ER-50 chuck/nut datasheet) | | **Type options** | Standard (vented) · Sealed (coolant-through) | | **Nut thread** | **M52×1.5** (standard ER-50 nut) | | **Recommended torque** | **150–200 Nm** (varies by nut style) | --- ### FAQ **Q: What size range does ER-50 really cover?** A: Individual ER-50 collets clamp roughly **1 mm of collapse** each. A full set in **1 mm steps** spans the series' working range (6–34 mm for ER-50). **Q: How "precision" is a good ER-50 collet?** A: Standard quality is **≤15 µm TIR**, while high-precision grades achieve **≤8 µm** and ultra-precision **≤5 µm** (collet-only, measured at bore). **Q: Do I need sealed collets for through-coolant tools?** A: Yes—**sealed ER-50 collets** block coolant bleed and deliver pressure to the tool tip; many are rated **~2000 psi (138 bar)**. --- ## What's included * 1× **ER-50 collet** (selected nominal) in a labeled protective tube * Label shows **size • accuracy tier • batch ID** (QR → datasheet & torque chart) --- ## Quality & Installation Standards **SKU Format:** AS-ER50-[SIZE]-[ACCURACY] (e.g., AS-ER16-1200-HP for 12mm High Precision) **Quality Control:** * Batch QC with precision gage pins at 20°C reference * Collet-only TIR measurement at bore * Visual inspection for surface defects and slot integrity * Traceable manufacturing batches with QR codes **Installation Best Practices:** * **Always clean** taper and collet before assembly * **Snap collet into nut** before threading onto chuck * **Use calibrated torque wrench** per manufacturer specifications * **Never tighten empty collet** - always insert tool shank * **Check tool shank** sits in upper half of clamp range for best TIR * **Replace collets** showing nicks, discoloration, slot cracks, or out-of-spec TIR --- ## Sealed vs Standard — when to choose | Need | Pick | | ------------------------------------------------ | ------------------------------ | | Through-coolant, keep chips/coolant out of slots | **Sealed (0.5 mm collapse)** | | Maximum size coverage per collet | **Standard (1.0 mm collapse)** | --- ## Accuracy & setup notes (for seasoned users) * Published TIR is **collet-only**. **System TIR** (holder+collet+tool) depends on chuck grade, nut style, torque, cleanliness, and shank geometry. * For finishing/micro tools: choose **Ultra Precision**, a **balanced holder**, and a **bearing nut**; keep shank engagement high. --- ## Helpful reminders * Don't clamp on flutes or Weldon flats. * Replace collets showing nicks, discoloration, slot cracks, or out-of-spec TIR. * Store dry; keep separate sets for **roughing** vs **finishing** to extend life.

ER-20 Spring Collet — 1→13mm Range

# ER-20 Spring Collet — ISO 15488 / DIN 6499 (8°) **Universal, high-grip tool holding for mills, lathes, routers & grinders.** ER-20 collets follow the ISO 15488 / DIN 6499 standard (8°) and are compatible with any ER-20 chuck. ## Choose your accuracy * **Standard (≤15 µm TIR)** — dependable everyday accuracy. * **High-Precision (≤8 µm TIR)** — tighter runout for better finish & tool life. * **Ultra-Precision (≤5 µm TIR)** — finishing-grade concentricity; also available as sealed coolant collets in this grade. > **Optional:** With matched premium holders (e.g., balanced G2.5), **system runout** can reach **≤3 µm**. --- ## Pick your inner hole size (ID) **Metric IDs from 1 mm → 13 mm** in 1 mm steps (and 0.5 mm half-steps). Each ER-20 collet normally **collapses ~1 mm** (e.g., 6.0 grips 6.0→5.0 mm). Very small IDs (≈≤3 mm) have a reduced collapse (~0.38 mm). ### Quick size guide (examples) * **1–3 mm**: PCB tools / micro-drills (reduced collapse). * **4–8 mm**: General drilling, light milling. * **13 mm**: Larger drills/end mills within ER-20 envelope; verify tool shank tolerance (h6/H6) for best grip. ### Choosing your size (step-by-step) 1. **Measure the shank** (e.g., **Ø 6.0 mm h6**). 2. Pick the **collet nominal ≥ shank**—*never* clamp above nominal. 3. Prefer the **closest nominal** (e.g., **6.0** for a 6.0 mm shank; not 7.0). 4. Decide **type**: * **Standard** (vented) → **1.0 mm** collapse (better range). * **Sealed** (coolant-through) → **0.5 mm** collapse (keeps chips/coolant out). 5. Pick **accuracy**: **≤15 µm TIR**, **≤8 µm TIR**, **≤5 µm TIR** (collet-only, at bore, 20 °C). --- ## Why machinists choose ER-20 * **Wide clamping range, fewer changeovers.** Each ER collet provides **~1 mm collapse** (commonly 1 mm steps across a set), so a 6 mm ER-20 collet securely clamps 6.0 → 5.0 mm. This minimizes inventory and speeds setups. * **Proven accuracy.** Quality ER collets hold ****≤15 µm TIR** / **≤8 µm TIR** / **≤5 µm TIR**** (collet-only TIR), boosting tool life and surface finish. * **Built for performance.** Made from hardened spring steel and precision-ground for repeatable concentricity and grip. * **Coolant-through options.** Sealed ER-20 collets support through-tool coolant—many rated to **~2000 psi (138 bar)**. * **Universal compatibility.** Fits any **ER-20 collet chuck** (BT, CAT, HSK, straight-shank, etc.); use with **UM/Hex/Mini** nuts (standard **M26×1.5** thread for ER-20). --- ## Key specifications (ER-20) * **Standard**: ISO 15488 / DIN 6499 (ER system, 8° taper) * **Clamping range**: **~1 mm** (per collet), sets typically in **1 mm steps** * **Accuracy grades**: * Standard: **≤15 µm TIR** (collet-only) * High Precision: **≤8 µm TIR** (collet-only) * Ultra Precision: **≤5 µm TIR** (collet-only) * **Shank tolerance**: **h6/H6 recommended** for best performance * **Nut interface**: UM/Hex/Mini; **M26×1.5** (std. ER-20 nut thread) * **Coolant**: Open (standard) or **sealed** (coolant-through) options available; sealed types often rated to **~2000 psi** > **Tip on torque:** Typical recommended tightening torque for ER-20 nuts ranges **50–80 Nm**, varying by nut style (castle/slotted/hex) and tool diameter—always follow your nut/chuck maker's table. --- ## Coolant-through options Select **Sealed (coolant-through)** ER-20 collets to deliver pressure to the tool tip; many are rated **up to ~2000 psi**. Use on-size sealed collets (no collapse) for proper sealing. --- ## What it's great for * High-mix machining where **fast tool swaps** and **wide coverage** matter * **End mills, drills, reamers, routers** (round shanks) in the **1–13 mm** range (typical ER-20 set coverage) * Applications needing **coolant-through** clamping (sealed ER-20) --- ## How to install (for best TIR) 1. **Snap the collet into the nut first** (engage the extractor ring) 2. thread onto the chuck 3. insert clean on-size shank 4. tighten with a torque wrench to your nut/chuck table. Never tighten an empty collet. (Follow your holder's torque chart.) *(Standards & maker docs reference this method to preserve runout.)* --- ## Available nominal sizes (ER-20) **1 → 13 mm (whole & half-steps)** 1, **1.5**, 2, **2.5**, 3, **3.5**, 4, **4.5**, 5, **5.5**, 6, **6.5**, 7, **7.5**, 8... and 10 more sizes > **Clamp bands (examples)** > • **Standard 6.0** → clamps **6.0 → 5.0 mm** > • **Standard 6.5** → **6.5 → 5.5 mm** > • **Sealed 6.0** → **6.0 → 5.5 mm** > • **Sealed 6.5** → **6.5 → 6.0 mm** --- ## Compatibility & fit Works with **ER-20 collet chucks** on **BT/CAT/HSK/straight-shank** holders. Ensure your nut matches ER-20 (**M26×1.5** thread, UM/Hex/Mini styles). For sealed setups, use **sealed collets** (or sealing disks where applicable) and a compatible nut. --- ## Care & best practices * Keep **collet, nut, and taper** spotless; light oil film only—debris hurts TIR. * Match **tool shank tolerance (h6/H6)** for grip and life. * Replace collets that show wear, spring fatigue, or crash damage; accuracy degrades before it's visible. --- ## Technical specifications | Property | Value | | -------------------------------- | ----------------------------------------------------------------------------- | | **Series** | ER-20 | | **Nominal size options** | 1–13 mm (incl. 0.5 steps) | | **Clamp range (Standard)** | nominal → nominal − **1.0 mm** | | **Clamp range (Sealed)** | nominal → nominal − **0.5 mm** | | **Accuracy tiers (collet-only)** | **≤15 µm TIR** · **≤8 µm TIR** · **≤5 µm TIR** *(measured at bore, 20 °C)* | | **Standard** | **ISO 15488 / DIN 6499-B** | | **Material** | **Hardened alloy spring steel**, precision ground *(INOX stainless optional)* | | **Finish** | Ground; optional black oxide | | **Slots** | Multi-slit elastic (ER) | | **Balance grade (typ.)** | G2.5 *(system balance depends on holder/nut)* | | **Max RPM (typ.)** | Holder-limited (see your ER-20 chuck/nut datasheet) | | **Type options** | Standard (vented) · Sealed (coolant-through) | | **Nut thread** | **M26×1.5** (standard ER-20 nut) | | **Recommended torque** | **50–80 Nm** (varies by nut style) | --- ### FAQ **Q: What size range does ER-20 really cover?** A: Individual ER-20 collets clamp roughly **1 mm of collapse** each. A full set in **1 mm steps** spans the series' working range (1–13 mm for ER-20). **Q: How "precision" is a good ER-20 collet?** A: Standard quality is **≤15 µm TIR**, while high-precision grades achieve **≤8 µm** and ultra-precision **≤5 µm** (collet-only, measured at bore). **Q: Do I need sealed collets for through-coolant tools?** A: Yes—**sealed ER-20 collets** block coolant bleed and deliver pressure to the tool tip; many are rated **~2000 psi (138 bar)**. --- ## What's included * 1× **ER-20 collet** (selected nominal) in a labeled protective tube * Label shows **size • accuracy tier • batch ID** (QR → datasheet & torque chart) --- ## Quality & Installation Standards **SKU Format:** AS-ER20-[SIZE]-[ACCURACY] (e.g., AS-ER16-1200-HP for 12mm High Precision) **Quality Control:** * Batch QC with precision gage pins at 20°C reference * Collet-only TIR measurement at bore * Visual inspection for surface defects and slot integrity * Traceable manufacturing batches with QR codes **Installation Best Practices:** * **Always clean** taper and collet before assembly * **Snap collet into nut** before threading onto chuck * **Use calibrated torque wrench** per manufacturer specifications * **Never tighten empty collet** - always insert tool shank * **Check tool shank** sits in upper half of clamp range for best TIR * **Replace collets** showing nicks, discoloration, slot cracks, or out-of-spec TIR --- ## Sealed vs Standard — when to choose | Need | Pick | | ------------------------------------------------ | ------------------------------ | | Through-coolant, keep chips/coolant out of slots | **Sealed (0.5 mm collapse)** | | Maximum size coverage per collet | **Standard (1.0 mm collapse)** | --- ## Accuracy & setup notes (for seasoned users) * Published TIR is **collet-only**. **System TIR** (holder+collet+tool) depends on chuck grade, nut style, torque, cleanliness, and shank geometry. * For finishing/micro tools: choose **Ultra Precision**, a **balanced holder**, and a **bearing nut**; keep shank engagement high. --- ## Helpful reminders * Don't clamp on flutes or Weldon flats. * Replace collets showing nicks, discoloration, slot cracks, or out-of-spec TIR. * Store dry; keep separate sets for **roughing** vs **finishing** to extend life.

ER-25 Spring Collet — 1→16mm Range

# ER-25 Spring Collet — ISO 15488 / DIN 6499 (8°) **Universal, high-grip tool holding for mills, lathes, routers & grinders.** ER-25 collets follow the ISO 15488 / DIN 6499 standard (8°) and are compatible with any ER-25 chuck. ## Choose your accuracy * **Standard (≤15 µm TIR)** — dependable everyday accuracy. * **High-Precision (≤8 µm TIR)** — tighter runout for better finish & tool life. * **Ultra-Precision (≤5 µm TIR)** — finishing-grade concentricity; also available as sealed coolant collets in this grade. > **Optional:** With matched premium holders (e.g., balanced G2.5), **system runout** can reach **≤3 µm**. --- ## Pick your inner hole size (ID) **Metric IDs from 1 mm → 16 mm** in 1 mm steps (and 0.5 mm half-steps). Each ER-25 collet normally **collapses ~1 mm** (e.g., 6.0 grips 6.0→5.0 mm). Very small IDs (≈≤3 mm) have a reduced collapse (~0.38 mm). ### Quick size guide (examples) * **1–3 mm**: PCB tools / micro-drills (reduced collapse). * **4–8 mm**: General drilling, light milling. * **16 mm**: Larger drills/end mills within ER-25 envelope; verify tool shank tolerance (h6/H6) for best grip. ### Choosing your size (step-by-step) 1. **Measure the shank** (e.g., **Ø 6.0 mm h6**). 2. Pick the **collet nominal ≥ shank**—*never* clamp above nominal. 3. Prefer the **closest nominal** (e.g., **6.0** for a 6.0 mm shank; not 7.0). 4. Decide **type**: * **Standard** (vented) → **1.0 mm** collapse (better range). * **Sealed** (coolant-through) → **0.5 mm** collapse (keeps chips/coolant out). 5. Pick **accuracy**: **≤15 µm TIR**, **≤8 µm TIR**, **≤5 µm TIR** (collet-only, at bore, 20 °C). --- ## Why machinists choose ER-25 * **Wide clamping range, fewer changeovers.** Each ER collet provides **~1 mm collapse** (commonly 1 mm steps across a set), so a 6 mm ER-25 collet securely clamps 6.0 → 5.0 mm. This minimizes inventory and speeds setups. * **Proven accuracy.** Quality ER collets hold ****≤15 µm TIR** / **≤8 µm TIR** / **≤5 µm TIR**** (collet-only TIR), boosting tool life and surface finish. * **Built for performance.** Made from hardened spring steel and precision-ground for repeatable concentricity and grip. * **Coolant-through options.** Sealed ER-25 collets support through-tool coolant—many rated to **~2000 psi (138 bar)**. * **Universal compatibility.** Fits any **ER-25 collet chuck** (BT, CAT, HSK, straight-shank, etc.); use with **UM/Hex/Mini** nuts (standard **M30×1.5** thread for ER-25). --- ## Key specifications (ER-25) * **Standard**: ISO 15488 / DIN 6499 (ER system, 8° taper) * **Clamping range**: **~1 mm** (per collet), sets typically in **1 mm steps** * **Accuracy grades**: * Standard: **≤15 µm TIR** (collet-only) * High Precision: **≤8 µm TIR** (collet-only) * Ultra Precision: **≤5 µm TIR** (collet-only) * **Shank tolerance**: **h6/H6 recommended** for best performance * **Nut interface**: UM/Hex/Mini; **M30×1.5** (std. ER-25 nut thread) * **Coolant**: Open (standard) or **sealed** (coolant-through) options available; sealed types often rated to **~2000 psi** > **Tip on torque:** Typical recommended tightening torque for ER-25 nuts ranges **70–100 Nm**, varying by nut style (castle/slotted/hex) and tool diameter—always follow your nut/chuck maker's table. --- ## Coolant-through options Select **Sealed (coolant-through)** ER-25 collets to deliver pressure to the tool tip; many are rated **up to ~2000 psi**. Use on-size sealed collets (no collapse) for proper sealing. --- ## What it's great for * High-mix machining where **fast tool swaps** and **wide coverage** matter * **End mills, drills, reamers, routers** (round shanks) in the **1–16 mm** range (typical ER-25 set coverage) * Applications needing **coolant-through** clamping (sealed ER-25) --- ## How to install (for best TIR) 1. **Snap the collet into the nut first** (engage the extractor ring) 2. thread onto the chuck 3. insert clean on-size shank 4. tighten with a torque wrench to your nut/chuck table. Never tighten an empty collet. (Follow your holder's torque chart.) *(Standards & maker docs reference this method to preserve runout.)* --- ## Available nominal sizes (ER-25) **1 → 16 mm (whole & half-steps)** 1, **1.5**, 2, **2.5**, 3, **3.5**, 4, **4.5**, 5, **5.5**, 6, **6.5**, 7, **7.5**, 8... and 16 more sizes > **Clamp bands (examples)** > • **Standard 6.0** → clamps **6.0 → 5.0 mm** > • **Standard 6.5** → **6.5 → 5.5 mm** > • **Sealed 6.0** → **6.0 → 5.5 mm** > • **Sealed 6.5** → **6.5 → 6.0 mm** --- ## Compatibility & fit Works with **ER-25 collet chucks** on **BT/CAT/HSK/straight-shank** holders. Ensure your nut matches ER-25 (**M30×1.5** thread, UM/Hex/Mini styles). For sealed setups, use **sealed collets** (or sealing disks where applicable) and a compatible nut. --- ## Care & best practices * Keep **collet, nut, and taper** spotless; light oil film only—debris hurts TIR. * Match **tool shank tolerance (h6/H6)** for grip and life. * Replace collets that show wear, spring fatigue, or crash damage; accuracy degrades before it's visible. --- ## Technical specifications | Property | Value | | -------------------------------- | ----------------------------------------------------------------------------- | | **Series** | ER-25 | | **Nominal size options** | 1–16 mm (incl. 0.5 steps) | | **Clamp range (Standard)** | nominal → nominal − **1.0 mm** | | **Clamp range (Sealed)** | nominal → nominal − **0.5 mm** | | **Accuracy tiers (collet-only)** | **≤15 µm TIR** · **≤8 µm TIR** · **≤5 µm TIR** *(measured at bore, 20 °C)* | | **Standard** | **ISO 15488 / DIN 6499-B** | | **Material** | **Hardened alloy spring steel**, precision ground *(INOX stainless optional)* | | **Finish** | Ground; optional black oxide | | **Slots** | Multi-slit elastic (ER) | | **Balance grade (typ.)** | G2.5 *(system balance depends on holder/nut)* | | **Max RPM (typ.)** | Holder-limited (see your ER-25 chuck/nut datasheet) | | **Type options** | Standard (vented) · Sealed (coolant-through) | | **Nut thread** | **M30×1.5** (standard ER-25 nut) | | **Recommended torque** | **70–100 Nm** (varies by nut style) | --- ### FAQ **Q: What size range does ER-25 really cover?** A: Individual ER-25 collets clamp roughly **1 mm of collapse** each. A full set in **1 mm steps** spans the series' working range (1–16 mm for ER-25). **Q: How "precision" is a good ER-25 collet?** A: Standard quality is **≤15 µm TIR**, while high-precision grades achieve **≤8 µm** and ultra-precision **≤5 µm** (collet-only, measured at bore). **Q: Do I need sealed collets for through-coolant tools?** A: Yes—**sealed ER-25 collets** block coolant bleed and deliver pressure to the tool tip; many are rated **~2000 psi (138 bar)**. --- ## What's included * 1× **ER-25 collet** (selected nominal) in a labeled protective tube * Label shows **size • accuracy tier • batch ID** (QR → datasheet & torque chart) --- ## Quality & Installation Standards **SKU Format:** AS-ER25-[SIZE]-[ACCURACY] (e.g., AS-ER16-1200-HP for 12mm High Precision) **Quality Control:** * Batch QC with precision gage pins at 20°C reference * Collet-only TIR measurement at bore * Visual inspection for surface defects and slot integrity * Traceable manufacturing batches with QR codes **Installation Best Practices:** * **Always clean** taper and collet before assembly * **Snap collet into nut** before threading onto chuck * **Use calibrated torque wrench** per manufacturer specifications * **Never tighten empty collet** - always insert tool shank * **Check tool shank** sits in upper half of clamp range for best TIR * **Replace collets** showing nicks, discoloration, slot cracks, or out-of-spec TIR --- ## Sealed vs Standard — when to choose | Need | Pick | | ------------------------------------------------ | ------------------------------ | | Through-coolant, keep chips/coolant out of slots | **Sealed (0.5 mm collapse)** | | Maximum size coverage per collet | **Standard (1.0 mm collapse)** | --- ## Accuracy & setup notes (for seasoned users) * Published TIR is **collet-only**. **System TIR** (holder+collet+tool) depends on chuck grade, nut style, torque, cleanliness, and shank geometry. * For finishing/micro tools: choose **Ultra Precision**, a **balanced holder**, and a **bearing nut**; keep shank engagement high. --- ## Helpful reminders * Don't clamp on flutes or Weldon flats. * Replace collets showing nicks, discoloration, slot cracks, or out-of-spec TIR. * Store dry; keep separate sets for **roughing** vs **finishing** to extend life.