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JIS screws in stainless

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exvalvesetdabbler:
I was ordering a few bits from AliExpress last week and came across some pan head screws in stainless that are made to GB823 standard.  Not one that I am familiar with, so just to make the order big enough to avoid postage cost, I ordered a few in M5 and M4.

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They have a smaller head compared to the DIN standard screws but the head is slightly thinner.  Probably risky under high preload settings but perfectly adequate for holding carbs and other non stressed bits together.  Finish is reasonable too so not much buffing needed to shine them up a bit.  Head diameter is the same as jis in the M5 size.

Regards
Dave

Skoti:

--- Quote from: exvalvesetdabbler on September 03, 2025, 08:14:24 PM ---I was ordering a few bits from AliExpress last week and came across some pan head screws in stainless that are made to GB823 standard.  Not one that I am familiar with, so just to make the order big enough to avoid postage cost, I ordered a few in M5 and M4.

(Attachment Link)


They have a smaller head compared to the DIN standard screws but the head is slightly thinner.  Probably risky under high preload settings but perfectly adequate for holding carbs and other non stressed bits together.  Finish is reasonable too so not much buffing needed to shine them up a bit.  Head diameter is the same as jis in the M5 size.

Regards
Dave

--- End quote ---


Interesting, they look OK.

I've always avoided Chinese made fasteners because of the low tensile strength and soft materials, instead I've been buying quality fasteners for a few quid more which seems safer to me.



Let us know how you get on with them.



 

exvalvesetdabbler:
I wouldn't risk using them for engine covers. Two will be used to hold the headlight rim in the shell and the rest to hold the top pieces on a set of carbs. Should save a bit of time machining a bit off the head on DIN screws.

I agree regarding dubious high tensile fasteners. I would stick with an ISO accredited supplier for those.

Regards
Dave

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