Tire valve stem pipe size
- Thread starter Mattlt
- Start date
Stuart in MN
Well-known member
According to Wikipedia, Schrader valve stem thread sizes are:
External thread: 0.305 in (7.747 mm) x 32 TPI[3] (1⁄32 in or 0.7938 mm pitch) (Tap size: 8v1-32)
Internal thread: 0.209 in (5.309 mm) x 36 TPI (1⁄36 in or 0.7056 mm pitch)
https://en.wikipedia.org/wiki/Schrader_valve#Dimensions
External thread: 0.305 in (7.747 mm) x 32 TPI[3] (1⁄32 in or 0.7938 mm pitch) (Tap size: 8v1-32)
Internal thread: 0.209 in (5.309 mm) x 36 TPI (1⁄36 in or 0.7056 mm pitch)
https://en.wikipedia.org/wiki/Schrader_valve#Dimensions
e015475
Well-known member
Search ebay for 'Schrader valve tap' and you'll find taps and dies for sale in the sizes Stuart mentions.
firebirdparts
Well-known member
It's not tapered, note.
You can get connectors made for that. You could cut one off a bicycle pump, for instance.https://www.amazon.com/dp/B00J9HCNTG/?tag=atomicindus08-20
You can get connectors made for that. You could cut one off a bicycle pump, for instance.https://www.amazon.com/dp/B00J9HCNTG/?tag=atomicindus08-20
Wrench97
Well-known member
What are trying to do?
Trying to be creative. and cheap!
I have had some success with seating beads on smaller tires by removing the valve core on the tire, and directly applying an air quick connect to the valve stem. However, some valve stems are not long enough to open the flow on the quick connect. Trying to make the valve stem longer. I haven't explored actual valve stem extensions yet; there's probably one out there that would work for me.
I kinda like the bike pump hose idea.
The trick is getting the valve core back in without losing the bead seat. ;-)
I guess there's always ether.
Wrench97
Well-known member
A Milton 731 may suit your needs> https://www.amazon.com/dp/B01EAAF3FW/?tag=atomicindus08-20
firebirdparts
Well-known member
Boy, that would be nice to have. I want one.
Disney
Well-known member
On my MC tires, I take out the valve core and use my blow gun into the valve stem to inflate. Once the bead seats, just put the core back in and use the tire valve to inflate.
engineer2
Well-known member
I've always wondered why August Schrader picked such an odd size.
Amazing our cars use a part that is basically unchanged from 1891.
Amazing our cars use a part that is basically unchanged from 1891.
Dustball
Well-known member
Probably wasn't odd at the time.
engineer2
Well-known member
We'll have to see what measurement system and tooling they had at the time.
metaleltr
Well-known member
Looks like the recapper plug is exactly what the op is looking for. I am reminded that I need another. Mine has disappeared.
HF air accessories kit use to have a female valve stem thread x female 1/4 npt thread included in them. it had to be unscrewed from another part. I made a half a dozen blow thru attachments to pop up truck tires from them. Pop tire, leave air hose on for 100 lbs or so, un chuck air hose and install valve core thru attachment remove attachment, finish airing.
I'll have to try that!
That looks like exactly what I need! Had no idea something like that existed. Thanks!
joe_padavano
Well-known member
You don't even need that. I just use a clamp-on air fitting with the internal valve removed. Does exactly what you want. Cost me a couple of bucks. These fittings unscrew from the middle and the check valve piece falls out.
^^ what i just bought to replace the one on my tire machine
$7 for 2 of them without the centers.
https://www.amazon.com/gp/product/B07QNN5YG3/?tag=atomicindus08-20
$7 for 2 of them without the centers.
https://www.amazon.com/gp/product/B07QNN5YG3/?tag=atomicindus08-20