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Description
Jacobs Chuck Jacobs J421 Metric Tap Chuck Collet, 12.7mm - GW 9748 ColletJacobs J421 Metric Tap Chuck Collet, 12. 7mm GW 9748 A collet is a specialized holding device used in machining and manufacturing processes to secure and grip a work piece or a tool in a machine tool, such as a milling machine or a lathe. It is a type of clamping mechanism designed to provide a strong and precise grip on cylindrical or round objects. Features: Parallel jaw insert surfaces exert uniform, accurate gripping force up to three times
Jacobs J421 Metric Tap Chuck Collet, 12.7mm - GW 9748
A collet is a specialized holding device used in machining and manufacturing processes to secure and grip a work piece or a tool in a machine tool, such as a milling machine or a lathe. It is a type of clamping mechanism designed to provide a strong and precise grip on cylindrical or round objects.
Features:
- Parallel jaw insert surfaces exert uniform, accurate gripping force up to three times greater than can be achieved with split - steel collets
- Each collet accepts and precisely centers a wide range of both decimal or metric diameters (within individual capacity ranges) to speed setups and increase machining productivity
- Durable one - piece construction. Synthetic rubber retains flexibility and resists deterioration from heat, coolants and cutting compounds
- Steel jaw inserts precision ground after molding process to ensure maximum gripping accuracy. Hardened for greater wear resistance than split steel collets
- Each collet bore is held concentric to the old Tapers, front and back, to minimize tier
- Automatically seals tool old To prevent coolant flow through thus increasing tool wear
- Seals collets and machine spindles to protect from abrasive particles and swarf
Specifications:
- A- Cap (in/mm): 0.14-0.26 in/3.5-6.5mm (Refer Drawing Image)
- B- Length (in/mm): 0.5 in/12.7mm (Refer Drawing Image)
- C- Angle: 40 deg (Refer Drawing Image)
- D- Diameter (in/mm): 0.941 in/23.9mm (Refer Drawing Image)
- Head Diameter: 23.9mm
- Model: J421
- Collet Type: Tap
- Number of Inserts: 6
- Compatible with Product Type: Collet Chucks
- Coolant Fed: Non-Coolant Through
- For Shank Type: Round
- Maximum Size: Round 1/4 in
- Measurement System: Metric
- Country of Origin: Germany
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- Free Standard Shipping on $100+ Orders to the USA.
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Exchange/Return Notes
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4.3 ★★★★★
Based on 19 reviews
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Product Reviews
★★★★★ 5
A big, beautiful, gift of a book!!
Format: Paperback, Format: Paperback
I hadn’t even made it past the intro before I had to email Dana and thank her for this book. THAT is the energy this book contains.
Her heart-centered distillation of LOTS of research and knowledge connects the dots so effortlessly and joyfully.
It seems every time I pick up this book I feel inspired, smarter and connected to it ALL!
This book is a gift!
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Reviewed in the United States on October 21, 2025
★★★★★ 3
Book content good but formats for both kindle and hard copy versions are not as expected
Format: Paperback, Format: Paperback
The info in the book is good however I originally purchased the kindle version but the format was difficult to read. It’s not like a regular kindle book. The book was beautiful and the pictures inside were in color.
So I decided to go ahead and order the hard copy even though it was very expensive. I received it today and it’s in all in black and white. No beautiful colored pictures.
For $45 it should be in color like the sample or kindle version. I spent $55 for both versions and neither is what I expected format wise. Just disappointing. It would be 5 stars of these issues were fixed. I attached a page of the kindle vs paperback.
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Reviewed in the United States on March 19, 2026
★★★★★ 5
The Best Fluoride-Free Toothpaste I've Tried
Flavor Name: 1. Sensitive Mint, Size: 5.25 Ounce (Pack of 1)
I've been using Davids Hydroxi Fluoride-Free Nano Hydroxyapatite Toothpaste for several weeks, and it has completely exceeded my expectations.
The first thing I noticed was how clean and smooth my teeth felt after brushing. Unlike many natural toothpastes, it leaves a genuinely fresh feeling without being overly harsh. The natural peppermint flavor is refreshing and pleasant without the intense burn that some mint toothpastes have.
What really impressed me is the nano-hydroxyapatite formula, which is designed to support enamel remineralization and reduce sensitivity. My teeth have become noticeably less sensitive to cold drinks, and they feel stronger overall. Nano-hydroxyapatite is gaining attention as a fluoride alternative because it can help replenish minerals in enamel and reduce sensitivity.
I also appreciate that it's:
Fluoride-free
SLS-free
Made in the USA
Vegan
Uses high-quality ingredients
Comes in a recyclable metal tube
The whitening is subtle but effective. My teeth look brighter without any increased sensitivity, and the toothpaste is gentle enough for daily use. The inclusion of xylitol and hydroxyapatite makes it feel like a premium oral care product rather than just another natural toothpaste.
While it's more expensive than conventional toothpaste, the quality and ingredients justify the price. Even dental professionals reviewing hydroxyapatite toothpastes have noted benefits for remineralization, sensitivity relief, and plaque reduction.
Overall: 5/5 stars. If you're looking for a fluoride-free toothpaste that supports enamel health, helps with sensitivity, and leaves your mouth feeling exceptionally clean, Davids Hydroxi is absolutely worth trying. Highly recommended!
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Reviewed in the United States on June 3, 2026
★★★★★ 5
Mild mint taste
Flavor Name: 1. Sensitive Mint, Size: 4 Ounce (Pack of 1)
I wanted to go fluoride free with my toothpaste so I decided to give this a try. I like that the flavor isn’t overly strong and it hasn’t caused any irritation at all. It doesn’t foam up as bad as my old toothpaste did. It is important to me that it’s all natural and fluoride free. My first check up at the dentist after using it went really well so it cleans your teeth really well. I would recommend it
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Reviewed in the United States on May 28, 2026
★★★★★ 5
Cleaner & Brighter Teeth.
Flavor Name: 1. Sensitive Mint, Size: 4 Ounce (Pack of 1)
I like the minty taste. My mouth feels fresh and my teeth look brighter & clean. Love this! Will definitely get this again.
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Reviewed in the United States on May 22, 2026