Powermax 4BA Machine Fasteners
The Powermax 4BA Screws provide standardized fastening for legacy electrical enclosures and telecommunications hardware. These 1/2-inch fasteners utilize the British Association (BA) thread profile, a system established for small-scale mechanical engineering and electrical applications. This specific sizing ensures compatibility with older terminal blocks, relay racks, and mounting plates commonly found in British-spec infrastructure. The 4BA gauge features a 3.62mm major diameter, providing a balance between structural strength and compact footprint. A 0.66mm thread pitch defines the helical structure, offering a finer thread than standard M3.5 metric alternatives. These dimensions meet the exact requirements of specialized IT infrastructure maintenance and restoration. Engineers use these components when servicing vintage equipment or specific industrial controllers that require non-metric threading. The zinc-plated steel construction offers corrosion resistance, which is vital for long-term deployments. This finish prevents oxidation in standard indoor environments and server rooms. Proper thread engagement remains critical for electrical grounding continuity and mechanical stability. These fasteners maintain structural integrity under low-frequency vibration environments.
Key Features
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Thread Geometry
The 4BA standard uses a 47.5-degree angle for specialized mechanical fit in legacy equipment. -
Material Specifications
- High-tensile carbon steel core
- Electro-galvanized zinc finish
- High shear resistance for industrial mounting
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Head Design
The pan head profile maximizes surface contact area to distribute clamping force evenly.
Specifications
| Feature | Specification |
|---|---|
| Thread Standard | 4BA (British Association) |
| Length | 1/2 Inch (12.7mm) |
| Major Diameter | 3.62mm |
| Thread Pitch | 0.66mm |
| Material | Zinc-Plated Steel |
| Head Type | Pan Head |
| Carton Quantity | 100 Pieces |
What’s in the Box
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100 x Powermax 4BA 1/2 Inch Machine Screws
Why Choose Powermax 4BA Fasteners
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Mechanical Precision: The 47.5-degree thread angle ensures a secure fit in BA-tapped holes without stripping legacy threads.
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Environmental Protection: Zinc coating prevents rust and maintains electrical contact points in grounded enclosures.
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Industrial Compatibility: These fasteners support maintenance of legacy British telecommunications and specialized electrical standards.
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Consistency: Uniform manufacturing processes ensure every unit in the 100-piece carton meets tight dimensional tolerance specs.
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Thermal Stability: The thread geometry accommodates material expansion during temperature cycles without losing tension.
Kennedy Omondi (verified owner) –
Finally found the 4BA size here. Most places only stock metric now, but these were exactly what I needed for the old switchgear. Good quality.
Faith Mutua (verified owner) –
Solid machine screws. The half-inch length is perfect for mounting small components in the workshop. They feel sturdy and the threading is very consistent across the whole pack. No complaints at all, happy with the purchase.