MJT

MJT may refer to:

Multi-jackbolt tensioner

Multi-jackbolt tensioners (MJT) provide an alternative to traditional bolted joints Rather than needing to tighten one large bolt, MJTs use several smaller jackbolts to drastically reduce the torque required to attain a certain preload. MJTs range in thread sizes from 3/4” to 32” and can achieve up to 20 million pounds of force and greater. MJTs only require hand-held tools, such as torque wrenches or air/electric impacts, for loading and unloading bolted joints.

Basics of multi-jackbolt tensioners

Multi-jackbolt tensioners (MJTs), registered under the trademark Superbolt or Supernut, are designed to decrease the torque required to tighten large bolted joints. One of the major problems associated with traditional bolt tightening methods is as the diameter of the bolt increases, the amount of torque required to tighten it increases in the third power of the diameter. Because of this, the largest size bolt a person can typically tighten by hand is 1". Multi-jackbolt tensioners reduce the amount of torque required to clamp the joint by using multiple jackbolts threaded through the nut or bolt head. The jackbolts, which are small enough to be tightened by simple hand tools, thrust against a hardened washer and generate clamping force on the joint. Loads up to 20,000,000 pounds and greater are attainable using only hand tools. MJTs and related products are produced by Superbolt, Inc. in Carnegie, PA.

MJT + 3

MJT + 3 is an album by MJT + 3, recorded in 1960 for Vee-Jay Records.

Track listing

Personnel

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