Fuse box cover thumb screws - anyone know the specs?

**gromit** · 15th August 2022, 06:49 AM

Originally Posted by JDNSW

Interesting question - are the threads actually ISO metric or BA? (BA is metric, and in this size the pitch is the same, but the thread profile is different - 47.5° instead of 60°. For this sort of application, 2BA and 5mm will work)

Also 10-32 UNF is the same as M5.

Originally Posted by reefmagnet

Just to follow up, here's my DIY solution from Ebay sourced bits...

Attachment 180346 Attachment 180347

The knobs are 5mm blind hole aluminium knurled thumb nuts 16mm diameter * 20mm high (got red because they're faster) and matched with M5 60mm stainless steel exhaust studs.

Stuck the studs in a drill press to file a point on them to allow them to find the hole better and then loctite'd them to the knobs.

Links to Ebay would help others, I like the solution.

Colin

**reefmagnet** · 15th August 2022, 08:21 AM

Originally Posted by gromit

Also 10-32 UNF is the same as M5.

Links to Ebay would help others, I like the solution.

Colin

Here's some links to the specific items but, when they eventually die, searching the descriptions should also yield results.
M3 M4 M5 Stainless Steel 304 Exhaust Manifold Studs Double End Threaded Rod Bolt | eBay
Blind Hole Aluminum Alloy Knurled Thumb Nuts M3M4M5M6M8M10 Hand Grip Knobs Nut | eBay

**reefmagnet** · 15th August 2022, 08:24 AM

Originally Posted by JDNSW

Interesting question - are the threads actually ISO metric or BA? (BA is metric, and in this size the pitch is the same, but the thread profile is different - 47.5° instead of 60°. For this sort of application, 2BA and 5mm will work)

One of my captive nut threads was mangled from a PO using a random bolt to hold the cover on, so I ran a standard 5mm tap through it to clean it up. The other thread was fine and the 5mm studs screw into both now easy as.

**JDNSW** · 15th August 2022, 09:48 AM

I think you will find that 2BA and 5mm will readily interchange - but the threads are not making very good contact.

**Landie110** · 20th November 2024, 02:55 AM

Just got a couple standard 5mm x 40mm steel knurled thumb screws from an engineering supplier on ebay, perfect fit. I'm sure similar would be available in Aus.

https://www.ebay.co.uk/itm/385140502427

Best wishes from Scotland

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