Does this imperial bolt still exist?

[Mikedefieslife]

Pulled a few bolts out expecting to replace them with shiny new M10 nuts and bolts. Unfortunately that's not going to work, so I'm looking at replacing the existing units.

I'm trying to find UNC A4 55 bolt in 3/8 x 2 5/8" It should also be DIN 931 where the thread only forms a small part of the length of the bolt. Does such a thing exist?

Best I've found so far is 3/8 x 2 1/2 but they are only F593C so 304 steel instead of 316 like an A4 bolt.

 

[Praxinoscope]

Have you tried Westfield Fasteners, they do S/S UNC bolts
enquires@westfieldfastners.co.uk

 

[scottie]

Pulled a few bolts out expecting to replace them with shiny new M10 nuts and bolts. Unfortunately that's not going to work, so I'm looking at replacing the existing units.

I'm trying to find UNC A4 55 bolt in 3/8 x 2 5/8" It should also be DIN 931 where the thread only forms a small part of the length of the bolt. Does such a thing exist?

Best I've found so far is 3/8 x 2 1/2 but they are only F593C so 304 steel instead of 316 like an A4 bolt.

Sure that they are UNC no BSW?.

 

[True_North]

Try Accu.cu.uk

Several A4 3/8 UNC bolts. Used them a lot in a classic car rebuild.

Mike

 

[Mikedefieslife]

Yep, it says UNC A4 55 as clear as day on the head of the bolt. It's roughly 9.45mm diameter and 67mm long so 3/8 x 2 5/8" It seems most imperial bolts are only A2 which is no good for me. This sits close to my bow and so will constantly splashed with salty water.

I have emailed Westfield Fasteners since they don't list anything similar on their website, but I'm not holding my breath.

They must have been avaiable in 1977 when my boat was built as there are three of them holding the forestay chainplate.

At the worst I can drill it out to 10mm with time and effort but would like to stay original if possible.

 

[[159032]]

Did you say nuts and bolts?
Why do you have to stay original? If you are just fitting fixings does it make any difference? Drill or ream to 10mm and fit easily available nuts and bolts.

 

[peteK]

I have several A2 including a propeller nut on the boat no sign of corrosion.

 

[PCUK]

304 is absolutely fine. 316 only required below the water-line. Also the bolt will be further protected by the metal it is fastening (unless that is 316)!

 

[Praxinoscope]

Had a quick look on Westfield website, they list A4 UNC stainless bolts.

 

[earlybird]

Agree with others above. You will have no problem with A2.

 

[LadyInBed]

Another place to try is
Wentin Fasteners
Address: 14 Oxford Rd, Pen Mill Trading Estate, Yeovil BA21 5HR
Phone: 01935 432744

 

[JumbleDuck]

I tend to use either Namrick in Brighton or A2 Fasteners (aka Stig Fasteners).

 

[Mikedefieslife]

Turns out 2 1/2" length will work so plenty of places stock this. Much faster and easier than having to drill out some stainless steel plates to 10mm and bore larger holes in my coach roof.

Thanks for all the suggestions of places to try.