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Questions tagged [bolting]

Questions on the design and materials used to connect pieces together using bolts.

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3 votes
4 answers
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Why is retorquing sometimes necessary and other times a mistake?

Bike mechanics will implore amateurs not to retorque a bolt. One must first undo the bolt and then retorque. Yet car wheels specifically require retorquing on a different day soon after installing the ...
Sam7919's user avatar
  • 441
0 votes
0 answers
62 views

Bolt torque values according to thread size and alloy?

I am putting together a motorcycle from OEM and custom made parts. I have parts from 6061 and 7075 aluminium and TiAl6V4 titanium and I am putting bolts in sizes M6, M8 and M10 (some fine and some ...
ChopperOnDick's user avatar
0 votes
0 answers
22 views

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 ...
Marco Luís's user avatar
0 votes
2 answers
177 views

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 ...
Ghilman Dilshad's user avatar
0 votes
0 answers
46 views

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 ...
TechieJ's user avatar
  • 101
0 votes
2 answers
81 views

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 ...
Akay's user avatar
  • 101
0 votes
1 answer
16 views

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?
Rekov's user avatar
  • 187
0 votes
2 answers
91 views

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 ...
Akay's user avatar
  • 101
0 votes
0 answers
22 views

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 ...
Danielle's user avatar
2 votes
2 answers
142 views

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 ...
Aden's user avatar
  • 19
0 votes
0 answers
22 views

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 ...
Forward Ed's user avatar
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0 answers
91 views

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) ...
Nubnubbud's user avatar
0 votes
0 answers
333 views

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 ...
EddieP's user avatar
  • 121
0 votes
2 answers
82 views

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 ...
jessegerritsen's user avatar
0 votes
0 answers
23 views

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 ...
Jake Henry's user avatar
0 votes
1 answer
66 views

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 ...
Atharva's user avatar
0 votes
1 answer
52 views

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 ...
NullPointerException's user avatar
0 votes
2 answers
858 views

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?
mark's user avatar
  • 1
3 votes
1 answer
102 views

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 ...
Steven Lu's user avatar
  • 131
1 vote
3 answers
140 views

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 ...
TMcC's user avatar
  • 13
2 votes
0 answers
60 views

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 ...
B4_'s user avatar
  • 21
-2 votes
1 answer
80 views

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 ...
user34265's user avatar
0 votes
0 answers
49 views

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 ...
Simon's user avatar
  • 115
2 votes
1 answer
809 views

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 ...
S. Rotos's user avatar
  • 2,259
2 votes
2 answers
3k views

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 ...
Ryan's user avatar
  • 67
0 votes
0 answers
53 views

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 ...
ThatsRightJack's user avatar
0 votes
1 answer
354 views

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 ...
JCP's user avatar
  • 1
0 votes
1 answer
1k views

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.
publicdomain's user avatar
0 votes
0 answers
145 views

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 ...
Maybe Julius's user avatar
0 votes
1 answer
127 views

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 ...
NMech's user avatar
  • 24.4k
1 vote
3 answers
2k views

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 ...
S. Rotos's user avatar
  • 2,259
1 vote
2 answers
2k views

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 ...
Hunter's user avatar
  • 79
1 vote
2 answers
374 views

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 ...
Kar's user avatar
  • 351
2 votes
1 answer
123 views

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 ...
Kar's user avatar
  • 351
1 vote
0 answers
2k views

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 ...
S. Rotos's user avatar
  • 2,259
6 votes
7 answers
7k views

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 ...
Codemonkey's user avatar
0 votes
1 answer
3k views

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 ...
Sam B's user avatar
  • 1
0 votes
1 answer
108 views

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. ...
tueftla's user avatar
  • 218
5 votes
3 answers
691 views

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 ...
tgun926's user avatar
  • 153
1 vote
1 answer
642 views

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....
Kyzen's user avatar
  • 113
1 vote
1 answer
80 views

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?
Ludwig Falk's user avatar
0 votes
0 answers
50 views

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 ...
tueftla's user avatar
  • 218
0 votes
0 answers
125 views

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 ...
tueftla's user avatar
  • 218
1 vote
0 answers
268 views

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 ...
tueftla's user avatar
  • 218
1 vote
2 answers
261 views

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 ...
Gally Battat's user avatar
4 votes
3 answers
2k views

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 ...
appwizcpl's user avatar
  • 173
2 votes
2 answers
4k views

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 ...
gunfulker's user avatar
  • 133
2 votes
2 answers
316 views

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 ...
Omid Fadaei's user avatar
0 votes
2 answers
385 views

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 ...
SSilk's user avatar
  • 103
2 votes
2 answers
3k views

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 ...
Kiran's user avatar
  • 43