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Shop by Category Hardware CNC & 3D Printing Automation & Linear Motion Pneumatics Embedded Development Electronics Camera Mounts Tools Other Why Shop With Us M4 4mm M4-0.7 Brass Threaded Heat Set Inserts for 3D Printing Bolts Screws Metal Product Description Pack of 20 (Twenty) threaded inserts. These create much more convenient and professional parts than using "captive nuts" (where you have to design a slot for a nut, and then place the nut in the slot and hold it there while affixing a screw). They also can be used in some situations where captive nuts just don't work. These are inserted into a hole in the print that is slightly smaller than the insert, and set in place using a soldering iron to melt the plastic around the insert. The inserts have a slight taper and small fins that the plastic flows around, resulting in an extremely strong bond. Rather than adjust designs around the limitations of 3D printing (supports, print bed size, etc), divide your parts into separate components that fasten using these inserts and machine screws. Not only does this give you greater flexibility when designing a part, but also allows you to re-print only failed components rather than full assemblies - saving time and money. These are threaded M4-0.7 with an overall length (OAL) .185" (4.7mm) Recommended hole size is .234" (top) and .226" (bottom) Have a look at our available insert assortments: Metric Imperial / SAE Metric+Imperial Combo 200pc See all of our current insert listings CLICK HERE We sell a wide variety of stainless steel and black oxide coated fasteners to go with these inserts. Please consider taking advantage of our multi-item discount found at the top of the listing page; it allows us to combine shipping and pass on the savings to you. 10% off 3, 15% off 5 items. Applies to most of our items. FREE Shipping to the USA and APO Addresses © 2018 Albers LLC. All Rights Reserved.