Questions tagged [bolting]
Questions on the design and materials used to connect pieces together using bolts.
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Shaft Nominal Diameter for M16 thread
I am looking to machine a M16 thread with a pitch of 2mm on a shaft, but I am unsure about what diameter should that shaft be in order to achieve the desired M16 thread. Does this change depending on ...
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What Tension Force will make the bolt to pull out of the NUT
I know how to calculate the bolt capacity for Tension and Shear, also how to check bolt bearing against different elelment such as Steel or Aluminum.
There is a hanging bolt by which a bar is hanging ...
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Bolt tensile load through an "intermediary"?
Following up on this question, does it change anything if the bolted arm is an intermediate arm (e.g. some sort of mating interface like below)? That is, the arm receiving the load is connected to the ...
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Failing engine A-Mount (bad design by the automotive manufacturer?)
I currently own a Tata Nexon Petrol car (in India) where I have seen (on facebook, Telegram, WhatsApp owner groups and youtube) that the A-Mount on the engine has suffered multiple failures for some ...
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How is the taper of a bolt correctly notated? (Imperial)
I have a blueprint which states the following about two bolts which are used:
Does that mean that the radius of the bolt decreases by 1/16" every foot, or the diameter?
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Why do some car's A-engine-mounts have bolts vs studs vs both?
I have come across engine mounts of various cars and am just curious primarily related to the "A" engine mounts where some manufacturers use only BOLTS, while some use only STUDS and some ...
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Straight Thread Seal Performance
Is it possible for straight threads to create a hydraulic/mechanical seal without the use of o-rings or sealants? From what I've read, in the oil industry buttress threads are used, in my application ...
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Different installation requirements for normal bolts vs torque-to-yield bolts
Why do stretch bolts need to be rotated 90 or 180 degrees after being torqued to a specified value? Why not just torque it to 120 nM instead of 100 nM + 90 degrees of rotation?
Also would it be ...
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BA Hole Designation
I a previous question I included a drawing for a strut. In this strut drawing it designates a 2 BA Hole in the bottom of the strut. I have seen this call out for many other parts that are part of ...
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When should a bolt and hole be tapped at an angle, if ever, from a structural/strength standpoint?
Assuming the head of a bolt makes proper contact with its surface and clamps properly, and tapping an angled hole is not an issue, when would an angled bolt and hole (relative to the primary surface) ...
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Calculating how many bolts are needed to hold parts
Suppose we have a stack of thin metal sheets, layered on top of each other. Let's say 20 sheets, 0.2mm thick, and each sheet is 70mm by 70mm.
Let's also say that the sheets are not totally flat, so ...
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How to calculate preload of fully compressed spring washer?
I'm planning to attach a 6mm countersink bolt to Finnish softwood plywood. I'm worried that the wood could gradually change due to for example moisture changes over time. Thus, I would like to add ...
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Are bolt and nut dimensions standardized?
Given the nominal size of a bolt/nut, e.g M10, can one construct all other dimensions from it? Do these dimensions differ between manufacturers or are these standardized. If so, where can I find ...
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Securing Removable "Clocked" Handrail Knobs
I am in the process of machining and assembling a smokebox for a model train. The smokebox in question is approximately 35mmx35mmx22mm. There are a series of handrail knobs and rails that are to be ...
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T9 Torx Screw Thread diameter in Metric System
Helllo,
I have to design a part that will have screws that can be taken apart with a T9 Torx Screwdriver. These are the screws that are taken apart first thing here.
What is the thread diameter of ...
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SOLIDWORKS-Bolting a COTS part from a STEP File onto an Assembly
Problem
I have a STEP file with a few holes for bolts. I'm hoping to bolt this part into stock material in Solidworks.
Example
My first thought is to extend the holes into other connected components ...
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Pull out force for a 5/8" tapped bolt
I am looking for the pull out force on a 5/8" bolt tapped into 1/4" thick tube steel.
Does the thickness of the steel need to match or be greater then the bolt diameter?
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What is the purpose of drilled washers?
I was browsing this website and noticed that they have drilled washers.
I could start to guess that the purpose of drilled washers may involve reducing weight by removing material (although this ...
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Tensile Force on Line of Bolts
I'm presented with a problem requiring some analysis to determine if an antenna bracket mounted to a concrete blockwork wall is sufficiently strong enough to endure a wind load given the known surface ...
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How to estimate effective area of contact between rough surfaces as function of surface roughness
The engineering problem that I am trying to solve is the following: I have two elements of a magnetic circuit that I must keep in contact through threaded fasteners. The primary objective is to ...
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Weird screw size?
Probably a real stupid question but googling is not shedding any light so maybe not?
A cap head screw of size 40xM8x10. What is the diameter and length of the screw?
Diameter is 8mm obviously, length ...
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Rule / equation for optimal screw diameter?
Is there a rule / equation for the optimal screw diameter per wood thickness?
I have a 16mm baltic birch plywood,
I have two pices 30mmX20mmX16mm
I want to butt join them at their profile
What will be ...
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What is the physical significance of bolt elongation length?
Eurocode: design of steel connections mentions something called "bolt elogation length", defined as the grip length of the bolt plus half of the sum of bolt head height and nut height. But ...
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How do you calculate the shear force on the screws that connect a door to a jamb via hinges
I'm trying to calculate the shear forces on hinge screws or bolts. Here is a schematic of the door with the relevant values:
First, I took a free body diagram of the door and its hinges. The ...
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Thread adapters larger than 1/2"
I have a 1/2-20 stud that I need to step up to a 3/4-16 stud. I searched around for 1/2-20 female to 3/4-16 male thread adapters, but was only able to find such a product on McMaster for sizes 1/2 and ...
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What type of fastener / rivet is this please?
I think I may have worked this out but I would love it if a real engineer could confirm it please? Is the fixing shown in the photos a shoulder rivet? Semi tubular? For the record the pictures show ...
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Are M8 screws double the size of M4 screws?
Found some printable M8 screws on Thingiverse (https://www.thingiverse.com/thing:4805480), which made me wonder if I can get M4 screws, just by resizing them factor 0.5.
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Is there a mushroom head bolt standard for sizes smaller than M4?
Is there a standard similar to DIN 603 / ISO 8678 (metric mushroom head square neck bolts) for sizes smaller than M4. DIN 603 only goes down to M5 (please correct me if I'm wrong).
I did see similar ...
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What is the best way to fasten securely a load onto a hollow brick?
Due to the ongoing COVID pandemic, I decided to put a basketball hoop on one of our outside walls, so that me and my son can stretch a bit. The problem is that the wall I plan to put the basketball is ...
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Bolt preload confusion
I'm trying to understand bolt preloading. I found this analogy on Wikipedia. I understand that as the spring is loaded to some pretension and the block is inserted, as we apply an external load to the ...
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Distribution of Forces into 3D Bolt Group
I'm trying to create an Excel spreadsheet that takes a 3D bolt group with x y and z coordinates, applied loading, and determines the distribution of forces into each bolt based on weighting by the ...
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Reduce stress on holes
I have an aluminium bearing holder attached to one end of an aluminium plate as follows:
The bearing holder is attached to the plate by two bolts on the bottom. The intended setup is to attach a ...
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Strength of bolts
I was wondering if it'd be a good idea to attach a 10kg load to the end of a movable steel rod by fastening it with just one M5 bolt. Looking at Misumi's datasheet, M5 (Class 10.9) has an allowable ...
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Why is the minimal bolt edge distance not affected by plate thickness?
Eurocode specifies minimum distances from a bolt hole to the edge of the plate. But why is the bolt diameter the only relevant parameter? Why isn't the minimal distance also a function of the plate ...
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Fixing a blind bolt hole when the first 2-3 threads are ruined?
One of my suspension bolts came undone while I was mountain biking recently, sadly I didn't notice. I landed a big drop with only 2-3 threads left engaged, and unsurprisingly it's ruined them.
The ...
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Proof load for screwing into aluminium plate
I have a required clamping force for fastening two pieces of metal together, and am trying to work out if an m4 bolt will be sufficient. The pieces will be fastened without a nut, just a hole through ...
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Is there a rule of thumb to construe a screw
When your first idea is drafted you calculate which forces/pressures and so on are working on your system. And then you break the forces down into the single screws which are built in your device.
...
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What causes a fastener to lock?
I am rebuilding a car engine. With some of the fasteners I am unscrewing, I notice that a lot of torque is required to undo the fastener. It feels like a snap when undoing a fastener, rather than a ...
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How to find the diameter of bolts in a flanged joint?
So I'm given this question with the following diagram:
Two sections of a pipe are joined in a flanged joint as shown in the Figure below. The difference in pressure from interior to exterior is 2 MPa....
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What does P0.35 stand for in a Tech drawing for a Bolt
Got a Tech Drawing today with measurements and all that. I understand everything except for one part where they've specified a bolt with M4 P=0.35. The M part I get but what does the P specify?
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Decision criterion if bolted joints are loaded concentrically or eccentrically
When dimensioning bolts I have to decide if the applied load is concentrically or eccentrically to the bolt axis (according to VDI 2230 but I think in other approaches too). But how do I decide and ...
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Calculating the lifting force $F_{Kab}$ with SolidWorks – according to VDI 2230
I’m not sure if my procedure to simulate the lifting force $F_{Kab}$ is correct. So I illustrate my way how to get the lifting force $F_{Kab}$ using SolidWorks and the simulation tool.
I hope you can ...
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Calculation of critical internal thread according to VDI 2230 Part 1
I’m doing a “Systematic calculation of highly stressed bolted joints – Joints with cylindrical bolt“ according to VDI 2230 Part 1. In step of calculation R11 “minimum length of engagement”, when my ...
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Help identifying a fastener/screw
I'm trying to identify the pictured fastener. It's a single piece around the arm of a gas spring, allowing it to pivot. I've had to replace the spring, but the screw is size M8 while the eyelet on the ...
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Can I use a wooden flat screw head with a washer to mimick a pan head screw?
For example - I am installing a fold up table from Ikea, it needs to hang from the wall, as shown below.
It explicitly says to use pan head instead of flat screw heads like shown in the picture, I ...
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Determining when bolt will bend
I'm attaching a metal pipe to a metal tube as shown in the below diagram. The bolt is threaded through one wall of the pipe and does not pass through the opposite wall of the pipe, but is tightened to ...
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How the amount of bolt's preload in a single lap joint can change the natural frequencies?
Few days ago someone told me that the amount of bolt's preload in a single lap joint can influence the natural frequency of the beam. So to test that out I modeled a 3D single lap joint in ABAQUS and ...
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Correct term for non-countersunk flat hex screw/ bolt?
There is a type of screw/ bolt that is flat on top so that it's almost flush when fully seated, but it is not counter-sunk, and it usually takes a hex driver (allen key). I see it used on Ikea ...
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Determine force distribution from a bolt pattern
Need some help designing a bolt pattern for a pressure tight enclosure.
How do i determine the force applied at a distance from a bolt location so that I meet the minimum force to compress the ...
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What is the hardware called that can step a lever N degrees upon manual force?
I'm trying to build a step stool that has a rotating chair back that will rotate from top position (e.g. chair) into bottom position (e.g. step stool). I do not want a free rotation of the chair back ...
