3/8-16 ID x 1/2-13 OD stainless threaded insert 3/4" long

3/8-16 ID x 1/2-13 OD stainless threaded insert 3/4" long plus or minus 1/16 or so

Does anybody sell one? I have been searching for 2 days and haven't found one. I think I need to go the full depth as the top of the cast aluminum comes to a small block about 1/2" thick the meatier part of the block is just below that.

The original hole is 1-1/8" deep and threaded as far as it could be.

I do not want to go with a bigger OD insert because I fear it would be too big.

I am thinking about trying to drill and tap a 1/2-13 stainless bolt.

Can an N bit be used for a 3/8-16 tap bit?

I do not have a 7.7mm and was trying to use the smallest bit that would still allow the tap to work.

Any advice would be greatly appreciated

I am already drilled to 27/64 because I was looking for a 3/8-16 x 1/2-13 threaded insert. And because the hole was already egged out to that size

That should work perfect and McMaster is usually very fast. I've ordered in the morning and got stuff in the afternoon before. Same with Grainger and MSC

Thank you very much! I've got hours looking. Of course on the weekend, you can't call anybody

Tapping Insert
for Soft Metal, Zinc-Plated Steel, 3/8"-16 Thread Size
default
Each
ADD TO ORDER
In stock
$5.17 Each
90240A003
For Use In Metal
Threaded Insert Type Tapping
Material Zinc-Plated Steel
System of Measurement Inch
Thread Direction Right Hand
Thread Size 3/8"-16
Thread Type UNC
Thread Spacing Coarse
Thread Fit Class 2B
Installed Length 11/16"
For Min.Material Thickness 11/16"
Drill Bit Size 17/32"
For Maximum Hole Diameter 17/32"
End Type Open
Tensile Strength Not Rated
RoHS RoHS 3 (2015/863/EU) compliant
Related Product Installation Tools
Also known as Tap-Lok inserts, these inserts cut their own threads in soft metals such as aluminum, so there’s no need to tap the hole. Install them into a drilled hole

Thunderjet said:

McMaster-Carr

Click to expand...

Do you know if these inserts are thread through style? I've run into some that have a bottom. The bolt threads in 3/4"

Just for reference, Can an N bit be used for a 3/8-16 tap bit?

I see the installation tool is rather expensive. Would a Grade * 3/8-16 bolt with a locking nut work just as good? Or a shoulder bolt?

Installation Tool for 3/8"-16 Thread Size Tapping Insert
default
Each
ADD TO ORDER
Delivers Tuesday
$175.69 Each
90240A031
1 each added to your order.
Delivers Tuesday
For Threaded Insert Type Tapping
Compatible With Tap-Lok
For System of Measurement Inch
For Thread Direction Right Hand
For Thread Size 3/8"-16
Square Drive Size 7/16"
Compatible with Tap-Lok inserts. Attach these tools to a ratchet wrench or drill chuck, and fasten an insert onto the end to screw the insert into a hole.

McMaster-Carr

jrsavoie said:

3/8-16 ID x 1/2-13 OD stainless threaded insert 3/4" long plus or minus 1/16 or so

Does anybody sell one? I have been searching for 2 days and haven't found one. I think I need to go the full depth as the top of the cast aluminum comes to a small block about 1/2" thick the meatier part of the block is just below that.

The original hole is 1-1/8" deep and threaded as far as it could be.

I do not want to go with a bigger OD insert because I fear it would be too big.

I am thinking about trying to drill and tap a 1/2-13 stainless bolt.

Can an N bit be used for a 3/8-16 tap bit?

I do not have a 7.7mm and was trying to use the smallest bit that would still allow the tap to work.

Any advice would be greatly appreciated

Click to expand...

Smallest d1 on the 1/2-13 is 0.3936 and the largest D om 3/8-16 is 0.3897. You're leaving only a potential 0.0039". In fact only a potential 0.002" of material. One thread should be changed. A finer pitch would also help.

Tapping Inserts for Soft Metal

Also known as Tap-Lok inserts, these inserts cut their own threads in soft metals such as aluminum, so there’s no need to tap the hole. Install them into a drilled hole with an installation tool and a ratchet wrench. Installation tools can also be placed in the chuck on a drill press and turned by hand.

3D CAD models availableFor technical drawings and 3-D models, click on a part number.

Inch
Inserts
Installation Tools
Thread
Size Installed
Lg. Drill Bit
Size For Max.
Hole Dia. Each Each
Zinc-Plated Steel
4-40 15/64" No. 21 0.159" 90240A007 $9.45 90240A022 $117.13
6-32 9/32" 13/64" 13/64" 90240A008 9.45 90240A023 117.13
8-32 21/64" 15/64" 15/64" 90240A009 9.45 90240A025 117.13
10-24 3/8" J 0.277" 90240A010 9.45 90240A027 140.56
10-32 3/8" 9/32" 9/32" 90240A006 2.75 90240A028 140.56
1/4"-20 31/64" 11/32" 11/32" 90240A001 2.95 90240A029 140.56
5/16"-18 9/16" 7/16" 7/16" 90240A002 3.33 90240A030 175.69
3/8"-16 11/16" 17/32" 17/32" 90240A003 5.17 90240A031 175.69
1/2"-13 29/32" 11/16" 11/16" 90240A004 7.61 90240A033 210.84
5/8"-11 1 1/8" 55/64" 55/64" 90240A005 12.28 90240A034 500.00

McMaster-Carr

Google Search 3/8"-16 Tap-lok insert

3/8"-16 Tap-lok insert - Google Search

I am going into a gear case for a motor mount on a 4 wheeler. The motor mount is 3/8-16 stud 3/4" long. I believe I have the same motor mounts in 3/8-24. I am guessing that I will have to go with a larger OD for the insert. Like the 17/32 above.

I am drilled to a depth of 7/8" with the 27/64 bit. The hole bottom is 1-1/8".

9/16-12 31/64 tap bit. 5/8-11 17/32 tap bit.

My concern about going bigger is the initial 1/2" the insert goes into is a rounded square about 15/16" diameter. I am trying to stay as small on the outside diameter to leave as much meat there as possible

Any suggestions for a different way of going about what I need to do, to install the motor mount?

I have never used Helicoils before. Only threaded inserts. I was under the impression that my hole was already too big for a helicoil - because I saw this -
Internal Thread Size: 3/8-16 UNC
Length: 0.75" (2x diameter)
Material: 18-8 (304) Stainless Steel
Type: Free Running
Tap Size: 3/8-16 STI
Drill Size: 25/64"

Then I was told this: A 3/8 helicoil outside bore is .min .452 and max .472 29/64 would be 0.4531

https://www.stanleyengineeredfasten...Vmul3GcnJvoOmpEPG9yrh_lC-1ec4v1lzRIeHvcfzfy-0