CoilSert Tangless Inch UNF Fine #1/4-28 × 2D

Overview

A tangless CoilSert is a wire thread insert with no driving tang, installed and removed with a mandrel that engages the coil's internal profile. The absence of a tang removes two long-standing problems: there is no tang to break off inside the hole, and no tang fragment to retrieve from a closed cavity after installation. This listing: thread 1/4 (.250)-28, thread system Inch UNF fine, length 2D, material 304 stainless steel, finish Plain (cadmium.

What sets this listing apart: Features Tangless installation.

Advantages

No tang means no foreign-object risk, which is the reason tangless inserts are specified for fuel, hydraulic and clean-circuit assemblies where a loose stainless fragment would cause a downstream failure.

Removal uses the same mandrel that installed the insert, so a damaged thread can be serviced without drilling out a coil, which is destructive in a blind hole.

Installation needs no tang-breaking step, shortening cycle time and removing the inspection step that checks whether the tang actually broke cleanly.

The coil geometry is otherwise identical to a standard insert, so tensile and torque performance match the equivalent tanged size.

Applications

Fuel and hydraulic manifolds, closed cavities where a broken tang cannot be retrieved, clean-room and medical device assemblies, and blind holes where a loose tang would be trapped.

Tangless inserts require the correct mandrel and cannot be installed with a standard tanged tool. Verify the tooling is available before specifying tangless for a repair kit that may be used in the field.

Product information is supplied by Toprecision. Custom parts can be produced to drawing — contact us for samples or a quotation.