Threading Adapters

Machined from Stainless Steel
Adapts to other Common Thread Standards
Ideal for Mounting Posts

Thorlabs' selection of thread adapters offers numerous options for switching between M2.5, M3, M4, M6, #4-40, #6-32, #8-32, and 1/4"-20 thread sizes. Choose from external-to-internal, external-to-external, or internal-to-internal thread adapters. We also offer internal-to-external threaded stud adapters.

The Mini-Series thread adapters can be used to make the Mini-Series posts compatible with our extensive range of optical mounts.

Counterbore Adapters

Threaded counterbore adapters are used to convert a counterbore to a threaded hole. A part such as the KM100 kinematic mirror mount features counterbores to provide imperial and metric compatibility. A caphead screw is typically used to fasten these mounts to a post, but in some instances it is necessary to attach the mount to a post with a fixed threaded stud. The counterbore adapter thus allows parts, such as the KM100, to be post mounted when a capscrew cannot be used.

The SD1 is an adapter ring that provides a means to attach #8-32 (M4) tapped components to 1/4"-20 (M6) counterbored parts. One possible use of the SD1 is in a dovetail optical rail setup where the RC1 rail carriers feature a 1/4" (M6) counterbore. Optic mounts are commonly attached to RC1 rail carriers and usually require the SD1 adapter as most optic mounts are #8-32 (M6) tapped.

Please Give Us Your Feedback

Email		Feedback On
(Optional)
Contact Me:
Your email address will NOT be displayed.

Please type the following key into the field to submit this form:

Click Here if you can not read the security code.
This code is to prevent automated spamming of our site
Thank you for your understanding.

Would this product be useful to you? Little Use 1 2 3 4Very Useful

Enter Comments Below:

Characters remaining 8000

Posted Comments:

Poster: Adam

Posted Date: 2010-05-17 15:18:58.0

A response from Adam at Thorlabs to makarov: Thank you very much for the customer inspired new product idea. I agree that this would be a great addition to the catalog and fill and important void in our thread adapters. I am currently working on a quotation for these custom thread adapters and will confirm the dimensions of the custom product via email.

Poster: makarov

Posted Date: 2010-05-16 01:43:11.0

I would like to buy AP4M4E adapter, external M4 to external #4-40 thread, length 9.5 mm (unfortunately not in your list). I need 20-30 pieces initially. The reason is that we are a metric lab but we have started to use MiniSeries and decided to reuse your standard 6 mm diameter cage rods as posts in MiniSeries, instead of buying separate 6 mm diameter MiniSeries posts (which would add clutter and confusion in the lab as new students try to interchange them with the cage rods). Its quite strange that this thread adapter is not a stock item, given your wide assortment. Right now we have to use two thread adapters on top of one another to mount an M4-threaded component to a cage rod; we have also tried to double-tap M4 holes with #8-32 tap to make it fit a single thread adapter, but I doubt the latter is a good idea lab-wide.

Poster: apalmentieri

Posted Date: 2010-02-17 15:15:44.0

A response from Adam at Thorlabs to Hanneke: We are currently in the process of evaluating the packaging of all of our products. We are updating the packaging to make them more environmentally friendly. Thank you for the suggestions, I agree that this is a good idea and we will get started on changing this packaging.

Poster: hanneke

Posted Date: 2010-02-17 12:20:53.0

I just ordered a bunch of thread adapters and have spent the morning unwrapping each individual screw. It seems that you could save yourself money and your customers time by putting the screws in ziplock bags based on part number in the quantity ordered (e.g. all the AP6M8E screws in the same bag). I do appreciate the perforations on the baggies, though.

Poster: Laurie

Posted Date: 2008-10-15 12:01:49.0

Response from Laurie at Thorlabs to dsmith: It is possible for our machine shop to do some custom machining, but we would need you to provide us with a drawing of your exact requirements prior to quoting you the cost. Thanks for your interest in our products, and please let us know if we can be of further assistance.

Poster: dsmith

Posted Date: 2008-07-18 07:14:57.0

I am looking for an adapter for use on an angle grinder with a 5/8" female thread to attach an M14 internally threaded cone. I would be looking for a quantity of approx. 50 pcs. Any assistance would be appreciated. Best Regards, Darragh Smith Technical Sales Abcon Industrial Products Cavmac Hose Building Cavan Road Cootehill Co Cavan Ireland

Click on any phrase below to search our site using our new Search Engine:

1 4 20 8 32 1 4 20 8 32 Adapter 1 4 20 Adapter 1 4 20 counterbore adapter 1 4 20 M6 1 4 20 M6 Adapter 1 4 20 thread adapter 4 40 8 32 4 40 8 32 Adapter 4 40 thread adapter 6 32 thread adapter 8 32 1 4 20 8 32 1 4 20 Adapter 8 32 1 4 20 Threads 8 32 4 40 8 32 4 40 Adapter 8 32 4 40 Threads 8 32 counterbore adapter 8 32 M6 8 32 M6 Adapter 8 32 thread adapter adapter adapter screw adaptor adaptor 1 4 20 adapter adaptor 8 32 adapter adaptor m4 adapter adaptor m6 adapter counterbore adapter external external adapter external external thread adapter external internal adapter external internal thread adapter external thread adapter external thread external thread adapter internal external adapter internal external thread adapter internal internal adapter internal internal thread adapter m2.5 thread adapter M3 M4 M3 M4 Adapter m3 thread adapter m4 counterbore adapter M4 M3 M4 M3 Adapter m4 thread adapter M6 1 4 20 M6 1 4 20 Adapter M6 1 4 20 Threads M6 8 32 M6 8 32 Adapter M6 8 32 Threads m6 counterbore adapter m6 thread adapter metric imperial adapter mini series adapter mini series thread adapter mounting adapters post post thread adapter screw adapter screw adapters screw dapter screws thread adapter thread adapters Thread Adapters External External thread thread adapter threaded adapters threaded counterbore adapter

Item #

Thread A

Thread B

Length C

AP4M3M

0.38" (9.5 mm)

AP6M4M

0.57" (15 mm)

AP8E4E

#8-32

#4-40

0.38" (9.5 mm)

AP6M8E

#8-32

0.57" (15 mm)

AP8E25E

#8-32

1/4"-20

0.57" (15 mm)

AP8E4M

#8-32

0.48" (12.2 mm)

AP25E6M

1/4"-20

0.57" (15 mm)

Item #

Thread A

Thread B

Length C

AS4M8E

#8-32

0.56" (14 mm)

AS8E4M

#8-32

0.56" (14 mm)

AS6M25E

1/4"-20

0.63" (16 mm)

AS25E6M

1/4"-20

0.63" (16 mm)

AS25E8E

1/4"-20

#8-32

0.61" (15 mm)

AS6M4M

0.61" (15 mm)

AS25E4M

1/4"-20

0.61" (15 mm)

AS6M8E

#8-32

0.61" (15 mm)

AS8E25E

#8-32

1/4"-20

0.68" (17 mm)

AS4M6M

0.68" (17 mm)

AS4M25E

1/4"-20

0.68" (17 mm)

AS8E6M

#8-32

0.68" (17 mm)

Item #

Thread A

Thread B

Length C

AE3M25E

M3-0.5

1/4"-20

0.38" (9.5 mm)

AE3M6M

M3-0.5

M6-1.0

0.39" (10 mm)

AE4E25E

#4-40

1/4"-20

0.38" (9.5 mm)

AE4E6M

#4-40

M6-1.0

0.39" (10 mm)

AE6E25E

#6-32

1/4"-20

0.38" (9.5 mm)

AE6E6M

#6-32

M6-1.0

0.39" (10 mm)

AE4M6M

M4-0.7

M6-1.0

0.39" (10 mm)

AE4M25E

M4-0.7

1/4"-20

0.38" (9.5 mm)

AE8E6M

#8-32

M6-1.0

0.39" (10 mm)

AE8E25E

#8-32

1/4"-20

0.38" (9.5 mm)

Item #

Thread A

Thread B

Length C

AI25E8E

#8-32

1/4"20

0.5" (13 mm)

AI6M4M

0.5" (13 mm)

Item #

Thread A

Thread B

Length C

MSA8

4-40

8-32

0.5" (13 mm)

MSA4/M

0.5" (13 mm)

MSA25

4-40

1/4"-20

0.55" (14 mm)

MSA6/M

0.55" (14 mm)

Item #

Internal Thread (A)

Outside Diameter (B)

Use in C-Bore

CBA8E

8-32

0.28" (7.0 mm)

CBA25E

1/4"-20

0.40" (10.2 mm)

1/4"

CBA4M

M4-0.7

7.0 mm (0.28")

CBA6M

M6-1.0

10.2 mm (0.40")

View All »Matching Part Numbers

Thread Adapters

Threading Adapters

Counterbore Adapters