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nt30 nt40 nt50 oz collet chuck
ZH
8466100000
Alloy Steel
56-58HRC
Machine tools collet chuck tool holder clamping accessories
DIN2080
0.005mm
milling machine
NT30/40/50
Silver
din2080
0.005mm
G2.5 25000rpm
DIN2080 OZ Precision Collet Chuck NT40 NT50 OZ25 OZ32 Milling Chuck Holder
ZH
DIN2080 OZ Precision Collet Chuck NT40 NT50 OZ25 OZ32 Milling Chuck Holder
Material: 20CrMnTi
Taper tolerance:<AT3
Carbon depth: 0.8mm±0.2mm
Max. Run out: <0.005mm
Surface Roughness: Ra<0.005mm
Cooling AD＋B type can be made by request
When Order, please specify balancing G6.3 or G2.5
Shank body standard: DIN2080
| Model | Clamping range | L | D | G |
| NT40-OZ25-63 | 3-25 | 63 | 60 | M16*2.0P 5/8''-11 |
| NT40-OZ25-100 | 3-25 | 100 | 60 | |
| NT40-OZ32-90 | 6-32 | 90 | 72 | |
| NT50-OZ25-63 | 3-25 | 63 | 60 | M24*3.0P 1''-8 |
| NT50-OZ25-100 | 3-25 | 100 | 60 | |
| NT50-OZ32-70 | 6-32 | 70 | 72 |
Package and shipment
Packing: 1pcs/plastic bag, plastic box inside ,carton box outside can also packing as your request.
Shipping: 3-7days after payment, by international express or as your request.
Company Profile
Pingyuan Zhenghao Machinery CO, LTD was found in 1998, professional produced GT precision modular vise, quick change tool post, tool holder, collets, end mills. It is a professional manufacturer of CNC lathe accessories in china. We have export experience for more than 10 years , Our productions export to more than 20 countries and regions.
Our company adheres to the principles of "quality first, customers supreme and reputation fundamental". we sincerely welcome foreign customers to visit us .
While ER collets are excellent for general-purpose work on manual machines, they can struggle to hold large-diameter end mills securely during heavy roughing cuts. The NT OZ Collet Chuck is engineered to solve this problem for traditional milling equipment. The OZ system (standardized as DIN 6388 or EOC) uses a 1:10 (approx. 5.7-degree) taper angle, which is much shallower and significantly longer than the 8-degree ER taper. This extended surface contact area generates massive frictional gripping force along the entire length of the tool shank, providing extreme rigidity and completely eliminating the risk of the cutter slipping or pulling out under heavy axial loads.
Maximum Gripping Force: The shallow 1:10 taper design of the OZ (EOC) collet delivers up to 50% more clamping torque than standard ER systems, absolutely preventing solid carbide or HSS end mills from pulling out during heavy-depth-of-cut (HDOC) manual milling.
Heavy-Duty Rigidity: Forged from premium alloy steel (such as 20CrMnTi) and case-hardened to HRC 56-60. The thick-walled construction of the NT taper and chuck body absorbs heavy milling vibrations, preventing chatter and extending the life of your cutting tools.
Ultra-Precision Runout: The internal collet seat and the external NT machine taper are precision-ground simultaneously. We guarantee a maximum Total Indicator Runout (T.I.R.) of ≤ 0.005mm (5 microns) at the taper, ensuring even chip loads on all cutting flutes.
Ball-Bearing Clamping Nut: Equipped with a heavy-duty ball-bearing nut that dramatically reduces friction during tightening. This allows operators to easily achieve maximum clamping force without twisting the collet or galling the tool holder face.
Standard Drawbar Threads: Machined with standard internal threads at the rear of the taper to perfectly match your machine's manual drawbar (e.g., M16 for NT40, M24 for NT50). Imperial (inch) threads are available upon request.
Direct Manufacturer Savings: Bypass trading companies and source heavy-duty conventional machine tooling directly from our factory for highly competitive wholesale pricing.
Complete Spindle Compatibility: We manufacture the full range of NT tapers for heavy milling: NT40 (the most common size for universal milling machines) and NT50 (for heavy-duty boring and milling machines).
Standard Heavy-Duty Capacities: Available in the most popular heavy-duty sizes: OZ25 (EOC25) clamping 2-25mm, and OZ32 (EOC32) clamping 3-32mm.
Strict Quality Control: Every tool holder undergoes rigorous inspection using 3D CMMs and taper gauges to verify dimensional accuracy and taper angle (AT3 standard) before packaging.
Q1: Why should I choose an NT OZ Chuck over an NT ER Chuck for my manual mill?
A: You should choose the NT OZ chuck specifically for heavy roughing, slotting, and high-feed milling. ER chucks are versatile but can suffer from tool pull-out under heavy loads. The OZ system's longer taper provides the massive grip and rigidity needed to push large end mills through tough materials (like steel or cast iron) without the tool slipping, allowing you to utilize the full horsepower of your machine.
Q2: Are OZ, EOC, and DIN 6388 collets the same thing?
A: Yes. DIN 6388 is the official standard. OZ (Ortlieb Spannzangen) and EOC (European Standard Collet) are common industry names for this exact same 1:10 taper collet system. They are 100% interchangeable.
Q3: Can I use this NT40 holder in a BT40 or SK40 CNC machine?
A:No. While NT40, BT40, and SK40 all share the same 7/24 taper angle, NT holders have a cylindrical pilot and an internal thread for a manual drawbar. They do not have the V-flange required for an Automatic Tool Changer (ATC) or the threads for a pull stud. They are strictly for manual or conventional NC machines with a drawbar.
Q4: How do I tighten the OZ nut?
A: OZ tool holders use a large, round ball-bearing nut with slots cut into the side. You must use a heavy-duty Hook Spanner Wrench (C-Spanner) that matches the outer diameter of the OZ nut (e.g., an OZ25 hook wrench). Unlike ER nuts, you cannot use a standard hex wrench.
Eliminate tool pull-out and maximize your roughing efficiency on conventional machines with our Heavy-Duty DIN 2080 NT OZ Collet Chuck Tool Holders.
Contact our sales team today for a complete catalog and bulk pricing.
