NPT style threads are very similar to BSP, certain DIN styles, and other non-US thread styles. Although visually very similar, the differences in thread dimensions, pitch and angle make them incompatible, so care needs to be taken to properly identify your connection to create a safe and leak resistant seal.

At Designer Optics, our skilled and experienced lab opticians play a crucial role in ensuring the quality and accuracy of your eyewear. With over 30 combined years of experience and full licensure, they review each prescription carefully and are equipped to answer any questions you may have.

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Where traditional NPT threads have a small clearance between the crest and root of the mating threads requiring the use of sealant, the NPTF thread root does not allow this clearance. It contacts and deforms the mating thread crest. NPTF, or National Pipe Taper Fuel, style connections are widely used in fluid power systems. This type of connector is designed to provide a dry thread seal. However, lubricant is often still used to ease assembly.

Free Shipping within the contiguous US only (excluding Hawaii and Alaska) on all Orders over $100.At DesignerOptics.com we are committed to the highest quality of service.We ship products to all 50 US states as well as to many other countries around the world. We take all the measures to ship our items in a timely manner, directly to your door, almost anywhere in the world.In stock products usually ship within two business days, but may take up to five business days*. When an order ships you will receive a confirmation email with the tracking information. You can also track your order by logging into your account.We provide FREE SHIPPING on all orders over $100 We also offer overnight and second day delivery shipping options. Please note that when using next day or second day delivery it still takes 48 to 72 Business hours for the order to be processed.

The Designer Optics Low Price Guarantee is simple:Designeroptics.com matches the price of all retail competitors and major online retailers.How it works:Place the frames in your cartBefore placing your order in add the following the comments box, Add the URL (web address) of the page where you found the lower-priced item,Your credit card will not be charged until we have confirmed with you by phone or by email that your item qualifies for our Price-Match Guarantee.

Our state-of-the-art lab is equipped with the latest technology and equipment, including advanced edging and cutting technology, to produce lenses that are precise and accurate. Whether you need full frame or rimless lenses, our team is dedicated to providing the best possible results.

NPSM, or National Pipe Straight Mechanical threads, are also often found in fluid power systems. The female component incorporates a straight, non-tapered thread with an inverted 30° chamfer of the male connector on the seat of the female. This is a mechanical seal. If and NPTF male is properly chamfered it will also seat with NPSM female connection. They are especially suited for manufacturers and end users that rely on versatility.

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NPT connections rely on thread deformation- a metal to metal sealing design where the threads of the connectors themselves form together. This design is ideal fore single assembly applications and not recommended where connections will be assembled and disassembled frequently due to wear on the threads from deformation.

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Please Follow those easy steps for returns1- Please fill out this form Return Authorization Form to get an RMA # you will receive a RMA # with instruction on how to return them within 48 to 72 Business hours from the time you submitted the form. Wait for our confirmation e-mail before shipping back the return2- Send the product back to us following the instructions indicated in our e-mail and to the address we will provide you.3- Make sure to confirm with us via e-mail the shipping date, the shipping service you used and the tracking number whenever you have4- Include details of the return and how you would like for us to go about it (refund, store credit, exchange, etc). Designer Optics is not responsible for items damaged along the way.Please allow us 3 to 5 business days from when items are received for us to process the refund. The amount to be refunded will not include shipping charges. if the order consists of 3 or more frames we will charge a 20% Restocking fee. otherwise only the shipping will be deducted.For more information please go to Returns

NPT connections seal pipes for fluid and gas transfer. They’re available in iron and brass for low-pressure applications and carbon and stainless steel for higher pressure. The nominal pipe size can be identified by physically measuring the thread diameter, then subtracting 1/4″. NPT (or National Pipe Taper) is a U.S. standard for tapered threads widely used on pipes and fittings for over 100 years.

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Sealing performance decreases rapidly with re-assembly and larger sizes are more prone to leaking because of the leak path size

At Designer Optics, we take pride in being one of the largest online marketplaces for prescription sunglasses and eyeglasses.

Apr 19, 2005 — For inch units the formula for cutting speed is N=12V/PI*D where N=Spindle speed RPM, V=Cutting speed FPM, D=Diameter of Cutter for milling ...