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Medium Blocks (Over 1/2 in. up to 1 in.)
Neodymium Block Magnets › Medium Blocks
Medium Neodymium Block & Bar Magnets (> 1/2 in. to 1 in.)
Heavy-duty industrial rectangular and square rare earth block magnets sized greater than 1/2 inch up to 1 inch (12.7 mm to 25.4 mm). Delivering high direct pull forces from 2.3 lbs to over 120 lbs, these mid-sized NdFeB blocks provide exceptional surface clamping power and anti-pivot torque resistance for commercial fixtures, magnetic separators, and machinery assemblies.
Technical Guide: Medium Neodymium Block & Bar Magnets (> 1/2 in. to 1 in.)
Medium neodymium block and bar magnets represent the most versatile workhorse size tier within our comprehensive Neodymium Block Magnets catalog. Defined by profile dimensions measuring greater than 1/2 inch up to 1 inch (12.7 mm to 25.4 mm), these sintered NdFeB blocks bridge the gap between small fasteners and ultra-heavy industrial lifting blocks. They deliver high magnetic flux density ($B_r$) and powerful direct holding force while maintaining a compact physical footprint suitable for commercial machinery, custom fixtures, and OEM sub-assemblies.
Engineering Parameters & Performance Metrics
- High Holding Force Capacity (2.3 to 120+ lbs): Depending on physical thickness and grade, direct contact pull force against a 1/2-inch thick solid steel plate ranges from 2.3 lbs for thin strips up to over 120 lbs for dense N52 blocks.
- Anti-Pivot & Shear Resistance: Unlike round disc magnets of equivalent volume, 6-sided rectangular geometry provides parallel mating surfaces that resist rotational torque, twisting, and lateral sliding under shear loads.
- Standard & High-Temperature Material Grades: Stocked in commercial N35-N42 grades as well as premium N45-N52 formulations for spatial optimization. High-coercivity grades (H, SH) are available for elevated thermal operating thresholds.
- Dimensional Tolerances (±0.002 in. / ±0.05 mm): Manufactured to precise engineering tolerances, enabling tight press-fits or flush mounting into CNC-milled pockets and aluminum channels.
Common Industrial & Commercial Applications
Mid-sized rare earth rectangular magnets are widely specified across diverse technical sectors:
- Industrial Workholding & Jigs: Securing steel plates, tooling fixtures, and welding clamps during manufacturing.
- Magnetic Separation Systems: Arranged in grates or chutes to extract ferrous contaminants from free-flowing grain, plastic regrind, or chemical slurries.
- Heavy-Duty Architectural Hardware: Concealed magnetic door latches for heavy commercial doors, marine hatches, and high-vibration RV cabinetry.
- Linear Actuators & Sensors: Providing predictable magnetic flux fields for non-contact position sensing and automation triggers.
Coatings, Thermal Limits & Handling Protocols
Standard stock blocks feature a metallic Nickel-Copper-Nickel (Ni+Cu+Ni) triple-layer plating designed for indoor or dry operational environments up to 176°F (80°C). Epoxy-coated and rubber-encapsulated variants are available for high-humidity or outdoor marine exposure.
Safe Handling Warning: Medium-sized neodymium magnets attract each other with immense velocity. Never allow them to snap together freely, as impact will shatter the brittle sintered ceramic material and create sharp metallic fragments. Always slide magnets apart laterally off a stack and use non-magnetic spacers during storage.
Frequently Asked Questions (FAQ)
What physical dimensions define a "Medium" block magnet?
This subcategory covers neodymium block and bar magnets where major length, width, or thickness dimensions measure greater than 1/2 inch up to 1 inch (12.7 mm to 25.4 mm).
How do medium block magnets differ from the main block magnet category?
While our broad Neodymium Block Magnets page covers all size ranges, this page focuses specifically on 1/2" to 1" profiles to help buyers match exact dimensional parameters without sifting through micro or heavy-duty industrial blocks.
How are medium block magnets magnetized?
Unless custom-ordered otherwise, stock blocks are axially magnetized through their thickness (T). This places the North and South magnetic poles on the two opposing flat rectangular faces.
Can medium neodymium blocks be drilled or machined?
No. Sintered NdFeB is brittle and will shatter if drilled. Machining also damages protective plating and produces combustible rare-earth dust. For mechanical screw attachment, choose pre-formed Countersunk Block Magnets.