Precision M4-M64 Double-End Studs: Specialized Fastening for Heavy Machinery
Our M4-M64 Double-End Studs, also referred to as Tap-end Stud Bolts, are engineered for high-precision mechanical assemblies where a standard hex bolt is impractical. These double-threaded fasteners feature a shorter “tap-end” designed to be permanently screwed into a pre-tapped hole in a machine body, and a longer “nut-end” for securing components. Manufactured strictly to DIN 938 and DIN 939 standards, our stud bolts provide the essential alignment and high-tensile strength required for critical engine and pump assemblies.
As a leading double-end stud factory, we offer precision-rolled threads and heat-treated 10.9 and 12.9 grade alloy steel to ensure maximum fatigue resistance and clamping stability.
- Interference Fit Design: The tap-end is designed for a tight fit into cast iron, steel, or aluminum housings, preventing the stud from backing out during maintenance.
- Multiple Engagement Depths: We provide DIN 938 (1d engagement) for steel, DIN 939 (1.25d engagement) for cast iron, and DIN 940 (1.5d engagement) for softer metals like aluminum.
- High Fatigue Resistance: Our 12.9 high-tensile studs are ideal for cylinder heads and rotating machinery where vibration and cyclic loading are common.
- Accurate Thread Alignment: Precision CNC manufacturing ensures that the unthreaded shank between the two threaded ends is perfectly concentric, allowing for seamless assembly.
| Thread Size | DIN 938 Tap-End (b1) | DIN 939 Tap-End (b1) | Pitch (mm) |
|---|---|---|---|
| M8 | 8.0 mm (1d) | 10.0 mm (1.25d) | 1.25 mm |
| M10 | 10.0 mm (1d) | 12.0 mm (1.25d) | 1.50 mm |
| M12 | 12.0 mm (1d) | 15.0 mm (1.25d) | 1.75 mm |
| M16 | 16.0 mm (1d) | 20.0 mm (1.25d) | 2.00 mm |
| M20 | 20.0 mm (1d) | 25.0 mm (1.25d) | 2.50 mm |
- Automotive & Marine Engines: Securing cylinder heads, manifolds, and transmission housings.
- Pump & Valve Manufacturing: Ideal for mounting pump casings and high-pressure valve bodies.
- Machine Tool Construction: Used as locating and fastening studs for heavy tool holders and fixtures.
- Power Generation: Alloy Steel B7 studs are used in turbine assemblies for high-temperature stability.
A: Use DIN 938 when the stud is being threaded into a steel body (high strength). Use DIN 939 when threading into cast iron, as the longer engagement (1.25d) compensates for the lower tensile strength of the iron.
Q: Do you offer custom shank lengths?
A: Yes, we provide OEM customization for the total length (L) and the middle unthreaded shank length to meet your specific mechanical drawings.
Source M4-M64 Double-End Studs from a Professional Supplier
Seeking bulk double-end stud bolts with high-tensile strength and guaranteed precision? We support global wholesale and ISO-certified quality. Contact us today for a free quote and technical samples!
