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Male Threaded Cup Magnets
External Threaded Post & Stud Mount Assemblies
Male Threaded Cup Magnets (Threaded Stud Mounting Bases)
CMS Magnetics manufactures heavy-duty male threaded cup magnets (also known as male stud pot magnets and external threaded mounting bases) engineered for direct through-hole fastening and equipment fixturing. Each assembly encases a high-grade sintered NdFeB permanent magnet inside a precision-machined, triple-plated mild steel cup featuring a solid, externally threaded steel stud centered on the closed back. The mild steel cup acts as a high-permeability magnetic shunt, concentrating flux lines exclusively onto the open contact face to deliver up to 5x the clamping force of an unencased magnet, while the protruding male stud threads directly into tapped machine bores or secures through sheet metal frames with standard hex nuts and lock washers.
Looking for flush screw mounting, female threads, or rectangular profiles? For flat-head screw installation flush with surfaces, explore our Countersunk Cup Magnets. If you need to thread bolts or eyebolts directly into the magnet, see Female Threaded Cup Magnets. For anti-twist door latches, view Neodymium Channel Magnets, or pair assemblies with Steel Magnet Strikers.
Integrated Machined Stud
Solid steel post resists high shear torque without snapping or stripping threads under load.
Steel Shunt Flux Boost
Ferromagnetic cup redirects rear magnetic flux lines to the contact rim, multiplying pull force.
Standard Pitch Threading
Precision metric (M4, M5, M6, M8) and imperial (1/4"-20) pitches fit standard industrial hardware.
Triple Ni-Cu-Ni Armor
Electrolytic protective barrier shields sintered neodymium core and steel cup from corrosion.
Filter by Cup & Assembly Style: Male Threaded Cup Magnets Countersunk Cup Magnets Female Threaded Cup Magnets Neodymium Channel Magnets All Neodymium Cups
Engineering Guide: Male Threaded Stud Mounting Mechanics & Load Capacities
Male threaded stud cup magnets are designed for external mechanical fastening where the magnet body acts as a heavy-duty magnetic mounting base for equipment, structural brackets, antennas, and lighting fixtures. Enclosing the neodymium core inside a plated mild steel cup isolates the fragile rare earth alloy from mechanical torque while multiplying contact pull force.
Male Threaded Stud Sizing & Pull Force Guide
| Cup Outer Diameter (OD) | Stud Thread Pitch & Length | Direct Breakaway Pull Force | Max Shear Slide Resistance | Primary Commercial Application |
|---|---|---|---|---|
| 0.63 in (16 mm) | M4 × 8 mm | 11 – 16 lbs | 1.8 – 2.5 lbs | Sensor brackets, lightweight display mounts |
| 0.79 in (20 mm) | M5 × 10 mm | 22 – 30 lbs | 3.5 – 5.0 lbs | CCTV cameras, temporary signage, electrical conduit |
| 1.26 in (32 mm) | M6 × 12 mm or 1/4"-20 | 65 – 85 lbs | 10.0 – 14.0 lbs | Emergency vehicle lights, antenna bases, machinery jigs |
| 1.89 in – 2.36 in (48 – 60 mm) | M8 × 15 mm or 5/16"-18 | 160 – 300+ lbs | 25.0 – 45.0 lbs | Heavy equipment workholding, structural steel rigging |
Fastener Selection: Male Stud vs. Countersunk vs. Female Threaded
Matching your mounting assembly to your mechanical interface prevents improper seating and fastener failure:
- Male Threaded Stud: Features a solid, protruding threaded shank on the rear face. Best for bolting through thin sheet metal, brackets, light bars, or threading into tapped blind holes in equipment frames.
- Countersunk Hole: Features a beveled center bore passing through the magnetic face. Best for flush wood or drywall screw fastening without adding rear height clearance.
- Female Threaded: Features an internally tapped female cylinder on the rear. Best for receiving standard machine bolts, threaded rods, or screw-in eyebolts.
Shear Sliding Forces vs. Direct Breakaway Pull
Rated holding forces represent direct perpendicular breakaway force (Case 1) tested on flat, clean, ground 1/2-inch structural steel. When mounting male stud cup magnets vertically on steel walls, vehicles, or equipment housings:
- The Friction Factor (μ): The coefficient of friction between smooth nickel-plated steel and clean metal is approximately μ ≈ 0.15 – 0.20. As a result, a vertical stud magnet begins sliding downward under roughly 15% to 20% of its rated perpendicular pull force unless mechanically supported.
- Substrate Thickness: To achieve maximum rated pull, the contact steel must be at least 1/4" to 1/2" thick. Attaching to thin 18- or 20-gauge sheet metal results in premature magnetic saturation, cutting holding capacity by 50% or more.
- Non-Ferrous Mating: When securing to wood, masonry, or aluminum panels, mate the magnet with matching zinc-plated Steel Magnet Strikers.
Frequently Asked Questions
How is the male threaded stud attached to the steel cup?
Our male threaded studs are integrally machined or precision-welded to the back of the heavy-duty low-carbon steel cup before plating. This solid mechanical bond prevents the threaded shank from twisting, loosening, or stripping away from the magnetic base under tightening torque.
Can I torque a nut down tightly onto the male stud?
Yes. Because the threaded post is attached directly to the outer structural steel cup rather than the internal sintered magnet, fastener tightening torque is transferred into the steel shell. However, hand-tightening with standard wrenches is recommended to avoid exceeding bolt shear limits on smaller thread sizes (such as M4 or M5).
Can male threaded neodymium cup magnets be used outdoors on vehicles?
Our assemblies feature triple-layer nickel-copper-nickel (Ni-Cu-Ni) plating to protect against atmospheric rust during outdoor use (such as temporary emergency light bars, antenna mounts, and fleet signs). For permanent exposure in harsh marine or salt-spray environments, consider applying a silicone sealant around the cup seam or explore naturally corrosion-proof Ceramic Cup Magnets.
What is the temperature limit for these assemblies?
Standard neodymium stud cup magnets have a maximum operating temperature rating of 80°C (176°F). Exceeding this threshold causes irreversible magnetic flux decay. For high-temperature equipment or engine bay applications, explore AlNiCo Pot Magnets (rated up to 500°C) or ceramic assemblies (rated up to 250°C).