How do you tighten a Superbolt?
Step 1: Tighten all jackbolts by hand crosswise. Step 2: Tighten 2 opposite jackbolts with 50% of recommended torque. Step 3: Tighten 2 other opposite jackbolts with 100%. Step 4: Tighten jackbolts in circular pattern at 100% until fully tightened.
How does a Supernut work?
Superbolt tensioners are designed as direct replacements for conventional nuts and bolts. These devices can be threaded onto a new or existing bolt, stud, threaded rod or shaft. The main thread serves to position the tensioner on the bolt or stud against the hardened washer and the load bearing surface.
What is a Supernut?
Multi-jackbolt tensioners (MJTs), registered under the trademark Superbolt or Supernut, are designed to decrease the torque required to tighten large bolted joints.
How does a Jackbolt work?
The jackbolts thread through the round tensioner body, or bolt head, and thrust against the hardened washer to stretch the stud/bolt and generate clamping force. The torque needed to tighten each jackbolt tends to be small and easy to generate, thus enabling use of hand tools.
Why does a Superbolt obviate the need for extremely large tools?
Integral to the design, Superbolt adds desirable elasticity to the bolted joint, which helps maintain preload, especially in thermal or dynamic applications.
What is the largest lightning bolt ever recorded?
The megaflash lightning bolt spanned 477 miles across the sky.
Can lightning red?
Lightning traveling through open air emits white light, but can appear in different colors depending on local atmospheric conditions. Distant lightning can appear red or orange the same way the setting sun does, due to moisture, haze, dust, etc in the lower levels of the atmosphere.
What are the different grades of hex nuts and washers?
Nuts and Washers Grade of Bolt A194 Heavy Hex Nut Grade A320 Grade L7 4 or 7 A320 Grade L7M 7M A320 Grade B8 (Class 1 and 2) 8 A320 Grade B8M (Class 1 and 2) 8M
What is a multi-jackbolt tensioner?
Superbolt multi-jackbolt tensioners (MJTs) take the high preload requirements in large diameter bolting and break it down into manageable torques using the jackbolts threaded through the nut body.
What grade of hex nut is used in A320 bolts?
A320 bolts will use A194 heavy hex nuts. There are multiple grades within the A194 specification. The appropriate grade of A194 nut will be determined by the chemistry and strength of the fastener grade. The chart below matches the compatible grade of nut with the specific grade of bolt.
What are the dimensions of a heavy hex nut?
Heavy Hex Nut Dimensions Bolt Diam. F F F C 3 1 ⁄ 2 5 3 ⁄ 8 5.375 5.200 6.207 3 3 ⁄ 4 5 3 ⁄ 4 5.750 5.562 6.640 4 6 1 ⁄ 8 6.125 5.925 7.073