Description
When the ground is wall-to-wall iron, the smallest coil is the one that finds the keeper. At 4 inches this is the tightest coil in the First Texas line: a pinpoint detection field that picks a good target out of trash a bigger coil hears as one blurred signal.
At a glance: This is the genuine Fisher 4 in / 10 cm concentric search coil with the First Texas screw-in connector, for the F11, F22, F44 and the Teknetics Greek-series and EuroTek Pro. Its tiny footprint is built for the trashiest, tightest ground, where it separates close targets and slips into spots no larger coil can reach.
Genuine First Texas, in stock
This is the genuine First Texas part 4COIL-FS, not an aftermarket copy, and we stock it. It is the 4 in / 10 cm concentric search coil for the machines listed below. New to coils? Our Search Coil Buying Guide covers size and Double-D versus concentric before you choose.
Which detectors does it fit?
This coil uses the First Texas screw-in connector that the Fisher F-series and the Gold Bug, Gold Bug Pro and Gold Bug DP share. It does not fit the Gold Bug 2, which has its own dedicated connector, or the plug-in Teknetics EuroTek and Digitek. This coil is compatible with: Fisher F11, Fisher F22, Fisher F44, Fisher F5, Teknetics Alpha 2000, Teknetics Delta 4000, Teknetics Gamma 6000, Teknetics Omega 8500, Teknetics EuroTek Pro.
Why the 4 in concentric coil
A 4 inch coil is a specialist. Its detection field is small and sharply focused, so in iron-infested homesites, old foundations and dense-trash parks it isolates a single good target where a stock coil reads a coin and a nail as one signal. It also reaches the tight places finds hide: fence corners, between roots, along foundations. What it gives up is coverage and depth on open ground, so most hunters keep it as the trash-and-tight-spaces coil alongside a larger all-rounder.
Specifications
| Part number | 4COIL-FS |
| Type | concentric search coil, 4 in / 10 cm |
| Connector | First Texas screw-in (twist-lock) connector |
| Compatibility | Fisher F11, Fisher F22, Fisher F44, Fisher F5, Teknetics Alpha 2000, Teknetics Delta 4000, Teknetics Gamma 6000, Teknetics Omega 8500, Teknetics EuroTek Pro |
| Weight | Not published by First Texas. We list only verified figures |
Frequently asked questions
Will this coil fit my detector? This coil uses the First Texas screw-in connector that the Fisher F-series and the Gold Bug, Gold Bug Pro and Gold Bug DP share. It does not fit the Gold Bug 2, which has its own dedicated connector, or the plug-in Teknetics EuroTek and Digitek.
How is this size different from the others? The 4 inch is the trash-and-tight-spaces specialist, the smallest coil offered. Step up to the 7 inch for a lighter everyday coil, the 9 or 11 inch concentric for coverage, or the 11 inch DD for depth in mineralized ground.
Is it waterproof? First Texas search coils are submersible; keep the control housing dry. For a verified depth rating on your exact machine, call us and we will confirm before you hunt water.
History Seekers is a small American business and an authorized First Texas dealer (Fisher, Teknetics and Bounty Hunter are one El Paso company). Everyone here detects, top down, for coins, relics, jewelry and gold, and prior field experience is a hiring requirement, not a coincidence. The person who answers your fitment question may be the one who packs the coil and drives it to the UPS drop. The story is more important than the artifact.