what diameter hole is 1/4-20?
911294
It is for a 1/4" bolt & the thread count is 20 per inch. The actual hole is drilled with a #7 bit. The drill bit & tap is all in one in this kit. I love mine.
911295
1/4 20 will drill and tap a hole that will perfectly accept a 1/4" bolt with coarse 20 threads per inch. Most 1/4" bolts you buy will work with this tap. 10/32 taps will work with 10/32 bolts, and so on.
2278495
Are 1/4" 20 to 3/4" the correct dimensions for the adapter screw? I can't find that part. Thanks.
998263
Here are the recommended hole sizes for each Bulkhead Fitting: 1/2" Bulkhead Hole Diameter = 1 1/4"3/4" Bulkhead Hole Diameter = 1 1/2"1" Bulkhead Hole Diameter = 1 3/4"1 1/2" Bulkhead Hole Diameter = 2 1/2"2" Bulkhead Hole Diameter = 3"
381242
The 1 large hole is 3 1/4"; the 5 medium are 1 3/4" and the 12 small holes are just under 1 1/2".
489397
Looks like that would be a really tight fit. Are you sure the hole isn't 4-3/8 or 4-1/2?
150540
no they are not 1/4 inch think.. I believe they are around 1.5-2 mm think.. Please check the specifications. This product is of very good quality . I just did my basement and the quality is exceptional .
1347236
It's closer to 4.75. The one I have is drilled and a perfect fit for a ruger 10/22
493985
I checked mine and the threads are indeed 1/4" x 20. I didn't measure the bolt part, but it appears to be in the 1.25 to 1.5" range length. which is all threaded, plus around half an inch for the rubber tip.
464672
Im not home at the moment im offshore so im not a 100% sure but i do believe that it is a 3/4 size hole because the rubber thats around it keeps it in pretty tight...
1448721
Hi the bigger hole is 3/4" in diameter, and the smaller hole is 1/2" in diameter.
1556186
20 is the size of the screw. Technically it is 1/4" wide with 20 threads per inch. ONLY ONE SCREW.
7002
The largest hole seems to be 0.4 inch wide (1.1cm) - I would say in the middle between 0.4 and 0.5. I hope it helps.
936313
I measure the diameter of the outside of the hole at 1/32" shy of 3/8". The diameter of the inside of the hole is right at 1/4".
2064572
I believe the hole was 18" diameter. You can download the installation manual if you go onto their website and it will provide the installation instructions.
583350
Correction...upon further review it has a 1" diameter but it comes with a ring/washer to adapt to a 3/4" hole. Hope this helps.
602910
The smallest part of the shaft on the stoppers I received is .45 inch so no they will not fit into a 1/4 hole.
1566890
Just received one today and measured the diameter. It will fit in a 9/16" hole.