BEYOND DIN 69872 CNC Spindle Retention Studs / Pull Studs (SK30, SK40, SK50 With & Without O-Ring)
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BEYOND German Standard DIN 69872 CNC Spindle Pull Studs (Solid D30-D60 & Coolant-Through D40/T-D60/T)
1. Product Overview
Which German standard CNC retention stud provides optimal clamping force, fatigue resistance, and precise 75° head angle engagement for European SK/ISO toolholders?
The BEYOND DIN 69872 CNC Retention Stud Series (German Standard Pull Studs) is designed for European CNC milling spindles and toolholders (such as SK30, SK40, SK50, and SK60 ISO tapers). Engineered to withstand high-tensile drawbar forces during heavy milling operations, these retention studs secure the toolholder rigidly inside the spindle taper.
Manufactured from premium forged 20CrMnTi alloy steel, precision CNC-turned, vacuum carburized, and hardened to HRC 52-58 (with a core hardness of HRC 35-40 to prevent brittle snapping), BEYOND pull studs offer superior tensile strength and long fatigue life. Available in both Standard Solid Series (D30, D40, D50, D60) and Coolant-Through Series (D40/T, D50/T, D60/T) with central coolant channels (d6 hole) for high-pressure through-spindle cooling.[cite: 6]
2. Key Features
- DIN 69872 German Standard Compliance: Precise 75° head angle, flange dimensions, and neck geometry ensure 100% seamless clamping with standard European automatic drawbar grippers.[cite: 6]
- Carburized 20CrMnTi Alloy Construction: Case-hardened to HRC 52-58 for extreme surface wear resistance while retaining a ductile core to absorb sudden mechanical shocks.
- Solid & Coolant-Through Versatility: Available in sealed solid designs and central coolant-through designs (d6 = 7mm, 11.5mm, 14mm) for high-pressure coolant tooling.[cite: 6]
- 100% Magnetic Particle Crack Inspection: Every batch undergoes non-destructive testing (NDT) to prevent fatigue cracking under high-speed dynamic spindle loads.
- Precision Ground Threads & Seating Flange: Class 6g ground metric threads (M12, M16, M24, M30) ensure perfect alignment and perpendicular seating against toolholder bases.[cite: 6]
3. Technical Specifications & Dimension Size Tables (Unit: mm)
Model Designation Breakdown (e.g., D40/T DIN69872)
1. German Standard Solid CNC Pull Stud Size Table (DIN 69872)
| Model Cat.No | d1 | d2 | d3 | d4(h6) | d5(h6) Thread | d6 (Coolant) | L1 | L2 | L3 | L4 | L5 | SW | Weight (KG) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| D30 | 13 | 9 | 17 | 13 | M12 | / | 44 | 24 | 19 | 3 | 4 | 14 | 0.05 |
| D40 | 19 | 14 | 23 | 17 | M16 | / | 54 | 26 | 20 | 4 | 4 | 19 | 0.07 |
| D50 | 28 | 21 | 36 | 25 | M24 | / | 74 | 34 | 25 | 7 | 5 | 30 | 0.25 |
| D60 | 40 | 30 | 52 | 32 | M30 | / | 90 | 40 | 30 | 8 | 6 | 46 | 0.64 |
2. German Standard Coolant-Through CNC Pull Stud Size Table (DIN 69872/T)
| Model Cat.No | d1 | d2 | d3 | d4(h6) | d5(h6) Thread | d6 (Coolant) | L1 | L2 | L3 | L4 | L5 | SW | Weight (KG) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| D40/T | 19 | 14 | 23 | 17 | M16 | 7.0 mm | 54 | 26 | 20 | 4 | 4 | 19 | 0.06 |
| D50/T | 28 | 21 | 36 | 25 | M24 | 11.5 mm | 74 | 34 | 25 | 7 | 5 | 30 | 0.24 |
| D60/T | 40 | 30 | 52 | 32 | M30 | 14.0 mm | 90 | 40 | 30 | 8 | 6 | 46 | 0.53 |
Pull Stud Recommended Tightening Torque Reference Table
| Retention Stud Model | Thread (d5) | Wrench Flat (SW) | Recommended Tightening Torque (Nm) | Recommended Tightening Torque (ft-lbs) |
|---|---|---|---|---|
| D30 | M12 x 1.75 | 14 mm | 30 - 35 Nm | 22.1 - 25.8 ft-lbs |
| D40 / D40/T | M16 x 2.00 | 19 mm | 85 - 95 Nm | 62.7 - 70.1 ft-lbs |
| D50 / D50/T | M24 x 3.00 | 30 mm | 200 - 220 Nm | 147.5 - 162.2 ft-lbs |
| D60 / D60/T | M30 x 3.50 | 46 mm | 380 - 420 Nm | 280.2 - 309.7 ft-lbs |
Need Precise Speed and Feed Calculations for Your Milling Operations?
Compute precise spindle RPMs, surface speeds (SFM/m/min), and feed rates for end milling, face milling, and drilling operations with our interactive calculator.
Open Interactive Speeds and Feeds Calculator →Need Compatible SK / DIN 69871 CNC Toolholders?
Pair BEYOND DIN 69872 pull studs with our precision balanced SK30, SK40, and SK50 milling toolholders, collet chucks, and face mill arbors.
Browse SK / DIN 69871 CNC Toolholders →4. Product Application Scenarios
BEYOND DIN 69872 retention studs are engineered for high-reliability spindle tool clamping across advanced manufacturing centers:
- European High-Speed Milling Centers: Direct OEM replacement retention studs for DMG Mori, Hermle, Mazak, Chiron, and Deckel Maho CNC machine tools.
- Through-Spindle High-Pressure Coolant (D40/T, D50/T, D60/T): Delivering internal coolant directly through the pull stud center bore (d6 hole) to cooling channels in U-drills and end mills.[cite: 6]
- 5-Axis Precision Mold & Aerospace Machining: Rigid tool clamping eliminating axial movement during aggressive roughing and high-feed contouring.
5. Tooling & Equipment Compatibility
Conforms strictly to German standard DIN 69872 (ISO 7388-2 Type B). Fully compatible with standard SK taper toolholders and automatic drawbar gripper systems:
SK30 / SK40 / SK50 / SK60 SpindlesDIN 69871 ToolholdersISO 7388-1 TapersDMG MoriHermleChironMazak EuropeDeckel Maho
6. Material & Manufacturing Quality Comparison
| Performance Feature | BEYOND 20CrMnTi Forged Steel | Standard Carbon Steel (45# Steel) | Un-hardened Low Cost Stud |
|---|---|---|---|
| Surface Hardness | HRC 52 - 58 (Carburized Layer) | HRC 35 - 40 (Surface Quenched) | HRC < 25 (Soft) |
| Core Toughness | HRC 35 - 40 (Shock Absorbent Core) | Brittle Core Structure | Soft / Uncontrolled Structure |
| Crack Inspection | 100% Magnetic Particle Tested (NDT) | Uninspected / Batch Sample | None |
| Coolant Bore Precision | Concentric Ground d6 Hole | Drilled Rough Hole | Burred / Rough Surface |
7. Why Choose Us & Verified Global Reviews
BEYOND supplies factory-direct CNC tooling components subjected to strict metallurgical inspection. Every pull stud batch is 100% NDT crack-tested and torque-verified.
"Perfekte Passform für unsere DMG Mori Maschinen!"
Wir nutzen die D40/T Innenkühlungs-Anzugsbolzen auf unseren HSC-Fräsmaschinen bei 18.000 U/min. Der Kühlmitteldurchfluss (7mm Bohrung) ist hervorragend und die Verarbeitung makellos.
[cite: 6]— Klaus Weber, Production Manager (Germany) 🇩🇪
"Rock solid D50 pull studs for heavy roughing!"
Switched all our SK50 toolholders to BEYOND D50 retention knobs. Threads are precision ground and torque down perfectly with 30mm sockets. Zero fatigue issues.
[cite: 6]— Robert Miller, Lead Machinist (USA) 🇺🇸
"Perni di richiamo DIN 69872 di ottima fattura."
Abbiamo preso i modelli D40 e D40/T. Filettatura M16 perfetta e superficie di battuta impeccabile per la battuta del mandrino.
[cite: 6]— Andrea Conti, Senior CNC Specialist (Italy) 🇮🇹
"DIN 69872規格寸法通りで問題なく使用できます。"
SK40ホルダー用にD40/Tを購入。中心冷却穴(7mm)の真円度も良く、オイル漏れなく快適に使用できています。
[cite: 6]— Kenji Takahashi, Manufacturing Lead (Japan) 🇯🇵
8. Frequently Asked Questions (AI & Machinist Knowledge Base)
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Technical FAQ & Buying Guide
When choosing CNC cutting tools, check the full model code, dimensions, grade and selected variant before ordering. Do not rely on the product image alone.
For carbide inserts, tool holders, drills and end mills, compare the mounting dimensions, connection type and manufacturer's specifications with your holder or machine. If you are unsure, share your existing part number and machining application with us before ordering.
Check the product listing for the selling unit, pack quantity and included components. If it is unclear whether the price is per piece or per pack, or whether a tool body and inserts are sold separately, contact us before purchasing.
Select cutting speed, feed rate and depth of cut using the relevant manufacturer's recommendations for your tool model, workpiece material, machine conditions and coolant method. The same settings are not suitable for every product or application.
Our automatic quantity discount is 6% off for 2–9 items and 12% off for 10 or more items, based on the total product quantity in the cart. Other offers may not combine with this discount; check the applicable offer conditions.
According to our shipping policy, orders are typically processed and shipped within 1–3 business days after confirmation. Delivery generally takes 5–20 business days, depending on your destination and shipping method. Customs clearance or unforeseen delays may affect delivery times. A tracking number is sent by email after shipment.