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  1. Harry.

    I'm looking for a masking plug that

    I'm looking for a masking plug that is suitable for temperatures up to 200C. It needs to fit snug into the hole without covering any of the surrounding area. I've seen some flangeless plugs with a pull tab and they seem ideal. But they are made from PVC. Do you know what temperatures PVC can...
  2. Harry.

    High temperature self-adhesive tape (400°C, 752°F)

    Kapton tape? Maybe contact them and ask if its suitable for your application.
  3. Harry.

    What exactly makes aluminium an 'aerospace' grade?

    I hadn't heard about the Ford F150 bed puncturing. The Curiosity Rover Wheels were punctured too: They said it was because they underestimated how rough the terrain would be, and they made the aluminium wheels as thin as a credit card.
  4. Harry.

    Difference between Moulding shrinkage and thermal expansion

    The software won't be able to consider all factors, such as if the ABS is reinforced with fillers and fibres or pigments which will increase shrinkage. There is a thread here about shrinkage issues and calculations that you might find useful...
  5. Harry.

    Difference between Moulding shrinkage and thermal expansion

    Also, I've just had another thought, how are you measuring the shrinkage? Maybe use precision calipers such as insize venier calipers
  6. Harry.

    Difference between Moulding shrinkage and thermal expansion

    Could you use 0.6% as a test and measure it to see if there is a 0.2% difference or not?
  7. Harry.

    Market viability of 3D displacement sensor

    Have you compared your product against standard AMR sensors that work with magnets to detect rotation?
  8. Harry.

    What exactly makes aluminium an 'aerospace' grade?

    I see, I knew that Marine grade stainless steel usually refers to stainless steel 316, So I wondered if aerospace fasteners was a term that was used to refer to a certain grade of aluminium. For example, Aerospace grade bolts are supposedly used on the roof of Tesla's Model S car. It apparently...
  9. Harry.

    What exactly makes aluminium an 'aerospace' grade?

    So are these 'aerospace' nuts: https://www.accu.co.uk/en/hexagon-nuts/268690-HPN-M6-AL because they are aluminium grade 7075? I would have thought that they need to be certified for use in the aerospace industry or on an approved list?
  10. Harry.

    What exactly makes aluminium an 'aerospace' grade?

    I know that aerospace grade means that they are more durable and lighter for Aerospace industries, but what exactly are aerospace bolts? Are they just made of stronger aluminium?
  11. Harry.

    Best finish or coating for rust resistant stainless steel screws

    Thanks for your help. I've decided to use A4 stainless steel screws, possible with a black oxide finish. I've chosen A4 (316) stainless steel because it is more corrosion resistant than other types of stainless steel. I know that the black oxide coating won't provide corrosion resistance, its...
  12. Harry.

    Best finish or coating for rust resistant stainless steel screws

    Which is the best finish for rust resistant screws for wood for outdoor use? Zinc and then painted over?
  13. Harry.

    Black oxide coating vs electroplating

    I'm looking for a black matte finish purely for cosmetic purposes, but it can't change the dimensions of the screws. I am looking into black oxide coating and electroplating? Does anyone know if electroplating has a matte finish? Harry,
  14. Harry.

    Thread Galling Issues

    Thanks for your help. We used dissimilar metals in the end.
  15. Harry.

    Fastener material/ coating for application with KCL

    Hi, I've come across this post because I'm looking for some corrosion resistance answers about 316 screws. I'm attaching some plates to mounting brackets on boats. Its made from ss 316. We are attaching them with 316 fasteners which are proving difficult to install because of galling, but my...
  16. Harry.

    Thread Galling Issues

    We are attaching a mounting bracket to hollow section framework for a number plate for a boat. Its well above the water level and we have been using stainless steel screws in 316 to attach the plates into the mounting bracket. If we change to a different type of stainless steel, I don't think...
  17. Harry.

    Thread Galling Issues

    We are using stainless steel components in our sub-assemblies. We don't want to use lubricant because we don't want them to work loose. When using the same alloy grades, is there a method or lubricant which can avoid thread galling without having a negative impact on the effectiveness of threads?

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