That can range between 200-600 pounds. If your facility sees a lot of traffic throughout the day such as a popular department store like Wal-Mart, you need to look into a mag lock that comes equipped with a holding force that is best suited for security. Those can range between 600-1,200 pounds of pressure.
The variance in weight tolerance comes from how frequently the door is used. Commercial doors use specialty commercial-duty hinges that can hold between 400 and 600 pounds. Meanwhile, heavy-duty hinges are standard in certain commercial buildings and can hold between 600 and 1000 pounds.
Because the mating area of the electromagnet and armature is relatively large, the force created by the magnetic flux is strong enough to keep the door locked even under stress. Typical single door electromagnetic locks are offered in both 600 lbf (2,700 N) and 1,200 lbf (5,300 N) dynamic holding force capacities.
Rope locks are not designed to hold an imbalance of more than 50 lb (22.7 kg), nor as a speed control.
A holding force of 650 lbs. (Figure 1) is typical for most magnetic locks fit for traffic control and they may be easily defeated. However, this is a benefit compared to the use of light duty electric strikes.
For other swinging doors, as well as sliding and folding doors, the door latch shall release when subjected to a 15-pound (67 N) force. The door shall be set in motion when subjected to a 30-pound (133 N) force. The door shall swing to a full-open position when subjected to a 15-pound (67 N) force.
The Federal Child Entrapment Law, along with Sub-Zero manufacturing specifications, restricts a maximum door opening force to 15 lb of pressure.
Drywall Anchor Types for Lighter Items
Threaded drywall anchors are suitable for objects weighing up to 25 pounds and are ideal for use on drywall. Hollow-wall anchors can hold up to 30 pounds per pair on plaster, paneling and other hollow walls.
Repeated, dynamic loads can cause virtually every knot to fail. The efficiency of common knots ranges between 40—80% of the rope's original strength. For climbing specific knots, the efficiency range is typically between 60-80%. Modern climbing ropes have a tensile strength of upwards of 6,000 pounds.
I have found three common holding-force sizes for maglocks. 600, 1200, 1500 lbs | 180, 280, 545kg. I guess it would be easy to open a datacenter door held closed with a 600lb maglock (or less).
The strength of a magnetic field is measured in units called teslas, named after the inventor Nikola Tesla. The Earth's magnetic field, for example, has a strength of about 50 microteslas (μT). In comparison, the world's most powerful magnet has a strength of 45 teslas!
Any non-magnetic material can be used to defeat a maglock, such as clear plastic, provided it is easy to over look. Clearly, red electricians tape might not go unnoticed for very long. Aluminum tape of the type used for EMI shielding would also work quite well provided adequate thickness is achieved.
The most common standard flush-panel doors weigh 20–50 kg. Solid wood doors can weigh 40–150 kg, depending on the size of the door. Here are the maximum weight capacities for different series (per door): 75 series (Junior, Flow, steel): 50–100 kg.
3" Weld-On Barrel Hinges have a 220 lb capacity and don't have bearings or a grease fitting. These hinges are ideal for use with metal gates and doors.
Interior doors should require no more than 5 lbs. of force to open.
Sheet bend: Used for joining two ropes together of different sizes. Typical retained rope strength with the sheet bend is 45-60%. Double fisherman: Used for attaching the working end of a climbing line to a carabiner in place of a splice. Typical retained rope strength with this one is 65-70%.
There is usually excellent flexibility with braided rope, while many twisted ropes feel stiff and can be hard to maneuver. Importantly, braided rope is often quite a bit stronger than its twisted counterpart.
The Palomar Knot is the strongest fishing knot in many situations. This knot only has 3 steps making it extremely powerful and very basic. Since there are not many twist and kinks in this knot it makes it extremely tough to break. It can be used on Braided line and Mono-filament.
How much weight ceiling joists hold depends on their size and spacing and what they're made of. Wooden joists can support 50 to 100 pounds per square foot. Steel joists are more common in commercial buildings and can handle higher loads. Joists are spaced at regular intervals of 16 or 24 inches apart.
Command™ Picture Hanging Strips can hang items up to 20 lbs. For heavy duty picture hanging, 3M CLAW™ Drywall Picture Hangers can hang pictures on drywall up to 65 lbs. Q: Is there a picture hanger without nails? A: Command™ Picture Hanging Strips is a great option for no-nails picture hanging.
A double 2x4 of #2 hemlock, commonly called hemfir, carrying a span of 4′ with an unknown tributary area fails at about 360 pounds per linear foot. These two boards can carry so much weight because they are so short. By contrast, if the doubled 2x4's spanned 8′, they could barely carry 40 pounds per linear foot.
Your minimal torque is simply the weight of a door applied at half the door height, or 5 kg at 0.25m. Which is 1.25 kg-m or 125 kg-cm. Of course you need more than that for reliability, say 150-200 kg-cm.
If you do choose to place your fridge against a wall, make sure to leave 21/2" minimum clearance on each side to allow for the door to swing open.
Magnetic materials are regularly encountered around the home, often holding small objects on the kitchen fridge or keeping cupboards and fridge doors closed.