High Precision CNC Collet Nut Spanners & Wrenches (ER, EOC, SKC Series)

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Professional EOC OZ collet nut hook spanner wrench for DIN 6388 milling tool holder — EOC OZ Collet Nut Spanner Wrench

C hook wrenches in sizes 18-21 to 78-85, for EOC/ER-UM/APU/C series collet nuts, length 90–240mm.

High precision ER collet nut A type spanner wrench for CNC milling machine spindle — ER Collet Nut A Type Spanner

ER A-type open spanner: ER11-A, ER16-A, ER20-A, OD 19~34mm, Length 110~130mm

ER M type mini collet nut spanner wrench for high speed CNC motor spindle — ER M Type Mini Collet Spanner

ER M-type spanner: ER8-M / ER11-M / ER16-M / ER20-M / ER25-M, OD 12–35mm, Length 70–130mm

Heavy duty ER UM O type collet nut round spanner wrench for CNC tool holder — ER UM O Type Collet Nut Spanner

ER O-type spanner: ER16 / ER20 / ER25 / ER32 / ER40, fits ER collet nuts for tool holders and extension rods

Ergonomic red handle ER UM type collet nut spanner wrench with hook — ER UM Type Collet Nut Wrench with Handle

ER UM-type spanner: ER16-UM / ER20-UM / ER25-UM / ER32-UM / ER40-UM, OD 32–63mm, Length 180–290mm

SKC bearing type collet nut spanner wrench for high speed tool holder — SKC Bearing Type Collet Spanner

GSK & GER type spanner: GSK06/10/16/20/25, GER16/20/25/32, D 19.5–55mm, L 120–210mm

Product Overview

Our high-precision CNC collet nut spanners and wrenches are specifically designed for tightening and loosening clamping nuts on CNC milling machine tool holders. Manufactured from premium forged alloy steel with precision hardening and black oxide treatment, these wrenches offer exceptional wear resistance, high torque capacity, and non-slip operation to protect your collet nuts from damage.

Key Features & Advantages

Premium Material & Heat Treatment: Crafted from high-grade alloy steel (42CrMo/50CrV) with high surface hardness for maximum durability and extended service life.
Non-Slip Ergonomic Grip: Features rubber-coated handle options for comfortable, safe, and efficient high-torque manual clamping.
High Precision Fit: CNC-machined engagement jaws ensure a tight, perfect fit with collet nut slots, eliminating slipping and nut deformation.
Corrosion Resistance: Black oxide/phosphatizing surface treatment prevents rust and oil corrosion in harsh machining environments.

Available Spanner Types & Specifications

ER-A Type Spanner: Designed for standard ER hex nuts (ER11A, ER16A, ER20A).
ER-UM / O Type Spanner: Heavy-duty ring/hook design for ER-UM slot nuts (ER16UM, ER20UM, ER25UM, ER32UM, ER40UM).
ER-M Type Mini Spanner: Castellate/tooth-type wrench for ER mini nuts (ER8M, ER11M, ER16M, ER20M, ER25M).
EOC / OZ Spanner: Hook-type wrench engineered for EOC/OZ DIN 6388 clamping nuts.
SKC Bearing Spanner: Precision roller-bearing spanner designed for SK / SKC high-speed tool holder nuts, preventing surface scratches during clamping.

Applications

Widely used on CNC machining centers, milling machines, engraving equipment, and high-speed motor spindles for secure tool holder clamping and quick tool changes.

Why Choose Us?

Factory Direct Supply: Competitive wholesale pricing with scalable production capacity.
OEM & 定制化: Custom branding, laser marking, and color-dipped handle options available.
Strict Quality Assurance: 100% inspection before packaging to guarantee dimensional accuracy and hardness consistency.