DIN 352 M12 x 1.75 Hand Tap Set | HSS-M2 High-Torque 3-Piece Precision Kit for Heavy Industry
1. Introduction: The Critical Fastener Standard
The M12 x 1.75 is the "backbone" size for structural bolting in construction, automotive frames, and heavy machinery. Our DIN 352 Hand Tap Set is designed to solve the primary challenge of M12 tapping: High Radial Torque. By distributing the cutting load across a 3-piece sequence—Taper, Plug, and Bottoming—we ensure that threads are formed with 100% vertical alignment and zero micro-cracking in the workpiece, which is vital for load-bearing fasteners.
2. Technical Specifications
| Feature | Specification Details |
| Nominal Size | M12 x 1.75 (Standard Metric Coarse) |
| Standard | DIN 352 |
| Material Options | HSS-M2 (AISI M2) / HSS-4341 |
| Set Configuration | 3-Piece Set: No.1 (Taper), No.2 (Plug), No.3 (Bottoming) |
| Manufacturing Process | Fully Ground (Precision CNC Machined) |
| Tolerance Class | 6H (ISO 2) |
| Hardness | HRC 63-65 (M2 Grade) |
| Shank Diameter | 9.0 mm |
| Square Size | 7.0 mm |
| Overall Length | 75 mm |
3. Differentiated Engineering: Why Our M12 is Different
Most M12 taps fail due to "edge chipping" during the transition from the Taper to the Plug tap. Our HSS-M2 series features Optimized Flute Geometry that provides 20% more chip evacuation space than standard designs. Every tap is Fully Ground from a solid hardened blank, ensuring that the cutting edges are not just sharp, but metallurgically stable. This prevents the surface decarburization common in cheaper "rolled" or "half-ground" taps, leading to a tool life that consistently outperforms competitors in high-tensile steel (up to 900 N/mm²).
4. High-Value Industrial Applications
• Automotive Chassis & Suspension: Ideal for cleaning or creating critical threads in subframes and control arm mounts where M12 fasteners must meet strict safety tolerances.
• Heavy Plant Maintenance: The preferred choice for on-site repair of hydraulic brackets and gearbox housings where machine access is restricted.
• Structural Steel Fabrication: Designed to handle the abrasive nature of gray cast iron and structural steel plates used in bridge and building construction.
• Blind Hole Perfection: The No.3 Bottoming tap allows for threads to reach the absolute maximum depth, ensuring that M12 bolts have the full 1.75mm pitch engagement for maximum vibration resistance.
5. Supply Chain & Logistics for Wholesalers
We understand that for global distributors, "Product Protection = Brand Protection." Each 3-piece set is housed in a shockproof Rose-Box plastic case and dipped in a proprietary high-viscosity anti-rust oil. This ensures that the delicate cutting edges remain "factory-sharp" even after 6 months of sea transit. Since 1997, we have provided full OEM support, including laser-marking your brand logo on the 9.0mm shanks and providing customized SKU labels for seamless automated inventory management.
6. Professional FAQ
Q:What is the "Total Cost of Ownership" advantage?
A:While M2 steel has a higher initial cost than 4341, it provides 3x to 5x the tool life. For your industrial clients, this means fewer tool changes and a lower "cost-per-hole," making your brand the preferred choice for professional users.
Q:What is the precise drill size for M12 x 1.75?
A:For a perfect 6H fit, a10.2 mm tapping drill bit is required. Using a 10.0mm bit will drastically increase torque and the risk of tap breakage, while a 10.5mm bit will result in weak threads.
Q:Can you support custom thread lengths for specific MRO projects?
A:Yes. As a factory-direct supplier, we can customize thread lengths or shank dimensions for large-volume wholesale orders to meet specific local market engineering standards.
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