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Technifast supply a range of inserts designed for pre-tapped holes (Series PTT).  This type of insert has a standard metric internal thread and is available in through-tapped and blind-tapped versions.  The external thread is also a standard metric size.  They have a 45 degree shoulder and undercut. The lead-in is chamfered at 10 degrees. They are commonly used as a thread reducer or thread repair solution.

For the most demanding of applications we provide inserts for pre-tapped holes. These inserts are manufactured in stainless steel 303 and marine-grade stainless steel 316. We can also offer a blind-tapped version.

This type of insert is commonly used as a thread reducer and offers a quick and cost-effective way to decrease thread sizes or repair thread-stripped holes.


Thread Reducer / Pre-Tapped Hole Inserts (Series PTT) Size Range

Part # Thread Length ID OD OD Thread Type & Pitch Cutting Relief
M3471 M4 8mm M4 x 0.7mm M8 1.25mm N/A
M3472 M5 10mm M5 x 0.8mm M8 1.25mm N/A
M3473 M6 14mm M6 x 1.0mm M10 1.50mm N/A
M3474 M8 15mm M8 x 1.25mm M12 1.75mm N/A
M3920 M10 20mm M10 x 1.5mm M14 2.0mm N/A
M4051 M12 25mm M12 x 1.75mm M16 2.0mm N/A

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