Terminal tackle is the collective name for the small components that sit between the mainline and the hook – swivels, snap links, beads, lead clips, rig rings, and hooklink materials. These items do not catch fish directly, but the wrong component (or a poorly chosen one) will cost fish. A swivel that fails under pressure, a clip that opens on the cast, or a hooklink material too stiff to allow natural bait movement can turn a productive day into a frustrating one.
This guide covers the main terminal tackle components used in UK freshwater fishing, what each one does, and how to choose correctly.
[Image placeholder: A range of terminal tackle components laid out on a fishing mat – barrel swivels, snap links, lead clip and tail rubber, rubber and hard beads, rig rings, and small scissors beside them]
Swivels
A swivel is a two-part connector with a rotating joint between the two halves. The rotation prevents line twist accumulating during a retrieve or when a hooked fish rolls. Without a swivel, the line would twist progressively tighter with each revolution of the fish, eventually creating a tangled, weakened mess.
Swivels are sized by number: sizes 1-4 are large (pike, carp, sea fishing), sizes 6-10 are medium (general coarse use), sizes 12-16 are small (light river fishing, match fishing). Smaller number = larger swivel.
Barrel Swivel
The standard swivel type – a cylindrical brass or nickel barrel with an eye at each end. One end connects to the mainline (via a knot through the eye), the other to the hooklink or rig. Barrel swivels are used at the junction of mainline and hooklink in nearly every ledgering and feeder rig.
For carp and bream fishing, a size 8 barrel swivel is a practical all-round choice. For lighter river work (roach, dace, chub), size 12-14 is appropriate.
Rolling Swivel
A rolling swivel uses a different internal mechanism – the two halves rotate around each other rather than around a barrel. Rolling swivels have better rotation under load, which makes them the preferred choice for spinner and spoon fishing where the blade creates continuous rotational force on the line.
Crane Swivel (Cross-Lock Swivel)
A combined swivel and clip – one end swivels, the other is a locking snap gate. Allows lures to be changed without re-tying. Standard in lure fishing; not used in standard carp or coarse fishing rigs where a plain barrel swivel is preferable.
Swivel Quality
Swivel quality matters more than anglers often realise. Cheap swivels may not rotate smoothly under load, defeating their purpose. For carp fishing with heavy leads (2-3oz+), use purpose-made carp swivels (Korda, ESP, Gardner) with a breaking strain well above the line and hooklink. A swivel that opens or fails under a hard-fighting carp is a lost fish.
Snap Links and Clips
A snap link (also called a quick-change swivel, snap swivel, or simply a “link”) is a clip that opens and closes to allow quick attachment and removal of terminal tackle without re-tying knots. For lead fishing and carp rigs, snap links allow lead weights to be changed quickly for different casting distances and depths.
Standard Snap Link
A metal gate with a spring closure – the gate is pushed aside and snaps back over the attachment. Most commonly used for attaching swim feeders to feeder rigs. Size range mirrors swivels: smaller is lighter and more refined.
Duolock / Quick-Change Clip
A figure-of-eight locking gate that holds under pressure but opens with a simple thumb push. More secure than standard snap links – less likely to open on a heavy cast or when a large fish is close to the rod tip.
Lead Clip System
The lead clip is a purpose-made safety component used in carp rigs. It consists of: – A main clip body that attaches to the mainline swivel – A tail rubber that fits over the lead’s wire loop and holds it in the clip – The lead itself
The critical safety function: under heavy pressure (snagged lead, fish taking line into weed), the lead can pull free from the clip, leaving the fish tethered only to the light hooklink rather than to the full weight of a buried lead and snag. A fish tethered to a stuck lead on a mono or braid rig cannot be landed and risks injury if the line breaks. Lead clips allow the lead to eject so the fish can be played normally.
The tail rubber controls how easily the lead ejects – pushed fully onto the clip, it holds firmly; pulled back slightly, it allows the lead to eject at lower pressure. For typical still water carp fishing, a partially set tail rubber (1-2mm back from fully on) is a good starting point.
Beads
Beads serve as buffers and rig components in ledgering and carp rigs.
Rubber Rig Stops and Soft Beads
Small rubber or soft silicone beads that are threaded onto the hooklink or rig line and held in place by a knotted stop knot or a rig stop pin. Used to:
- Position bait on the hair rig at the correct distance from the bend of the hook
- Buffer the knot where the hooklink meets the swivel, absorbing shock from a run or cast
- Create stops in hair rigs so the bait cannot slide past a certain point
Soft beads are preferred adjacent to knots because they compress rather than cut the line under impact.
Hard Beads
Hard plastic beads are used above the lead or feeder as a buffer between the swivel and the lead weight. When a carp runs and the lead travels up the line, the hard bead absorbs the impact against the swivel or knot, preventing damage. Sizes 4-6mm are the most common for carp fishing.
Hard beads are also used as floatants and visual markers in some specialist rigs.
Rig Beads
Purpose-made rig beads with a small bore hole that allows them to be pushed onto hooklink material and held at a set position. Used in carp rigs to build boom sections and adjust hooklink alignment.
Rig Rings and Micro Rings
Rig rings are tiny metal rings (1-3mm diameter) used in carp hair rigs and specialist presentations. The hair (a short length of thin material below the hook) is threaded through the rig ring rather than tied directly to the hook. This allows the bait (boilie, pellet, corn) to sit at exactly the right position relative to the hook bend and move naturally when a fish mouths it.
Micro rig rings (0.8-1.2mm) are used with critically balanced baits and pop-up rigs where precise bait positioning and free movement matter.
Larger rig rings (2-3mm) are used for swivel-to-boom connections and quick-change bait systems.
Hooklink Materials
The hooklink (also called a hooklength or hook length) is the length of line between the mainline swivel and the hook. It is usually finer or softer than the mainline, creating a break point at the hook end that protects the mainline if the hooklink is bitten through or snagged.
Monofilament Hooklink
Standard monofilament is the simplest hooklink material – a single extruded nylon strand. It is supple enough for natural bait presentation, ties cleanly, and is easy to work with. A 4-8lb mono hooklink is used for most river and still water coarse fishing (roach, bream, tench, chub).
Monofilament has some stretch, which absorbs some shock when a fish takes the bait at short range. The stretch also means it telegraphs bites slightly less cleanly than stiffer materials.
Fluorocarbon Hooklink
Fluorocarbon is a denser material with a refractive index very close to water – it is almost invisible when submerged. It is also abrasion-resistant, which makes it useful in gravelly or rocky swims where monofilament would be cut.
Fluorocarbon is stiffer than monofilament, which is a disadvantage with very small hooks and light baits but an advantage when a stiff boom is needed to kick the hooklink away from the mainline and prevent tangles.
For clear-water carp fishing and when targeting wary fish, fluorocarbon hooklinks (8-12lb) are preferred. For perch, roach, and general coarse fish in clear rivers, lighter fluorocarbon (3-5lb) works well.
Coated Braid Hooklink
A braided core with a stiff plastic coating. The coating provides rigidity (preventing tangles on the cast) while the inner braid remains supple when the coating is stripped back near the hook. This combination allows a stiff, tangle-resistant boom section with a flexible, natural section adjacent to the hook.
Coated braid hooklinks (15-25lb) are standard in carp fishing. Strip the coating from the last 3-5cm next to the hook with a thumbnail or hooklink stripper so the bait moves naturally.
Soft Braid Hooklink
Uncoated braid is extremely supple – it drapes rather than holds a shape. Used in bottom bait and wafter presentations where the hooklink needs to lie completely flat on the lake bed, undetectable to wary carp. Soft braid (8-15lb) is effective in situations where coated braid is too stiff.
Lead Weights and Their Connection
Leads (weights) connect to the rig through a clip, snap link, or directly onto the mainline above the swivel. Lead shapes:
- Inline lead: The lead has a central bore – the mainline passes through the lead body and exits at the front where the hooklink swivel sits inside a rubber insert. Creates a highly direct, self-hooking rig.
- Flat pear lead: A flat, pear-shaped lead on a clip system. The flat side reduces rolling on sloping or firm lake beds.
- Bomb (pear lead): The standard general-purpose lead on a snap link. Widely used for feeder fishing and general ledgering.
- Backlead: A lightweight inline lead that is threaded onto the mainline after casting and sinks the line to the lake bed, preventing it from resting across fish or weed.
Rig Stops and Stops
A rig stop is a small barbed plastic peg pushed through the bore of a rig bead or hookbait to lock it in place on the hooklink. Push the stop through the bore of a pellet or plug it into the bottom of a pre-drilled boilie. The stop holds the bait securely on the hair without tying a knot through the bait.
Stops come in different sizes (micro, standard, large) to suit different hookbait bore diameters. Use the correct size – an undersized stop will pull through the bore under pressure, losing the bait.
Frequently Asked Questions
What breaking strain swivel should I use for carp fishing?
Use swivels rated at least twice the breaking strain of your hooklink. If fishing with a 15lb hooklink, use swivels rated 30lb+. Swivel failure is rare with quality components but a weak swivel that opens under a hard-fighting fish is a lost catch. Korda, ESP, and Gardner all produce reliable carp swivels.
Do I need a lead clip for still water fishing?
It is strongly recommended. A snagged lead on a running rig without a safety clip can tether a fish to the bottom if the hooklink breaks – the fish cannot free itself and may not survive. A lead clip allows the lead to eject under pressure so any tethering risk is removed. Most carp venues require a lead clip or running lead setup.
What is the difference between a hair rig and a straight hooklink?
A straight hooklink has the bait directly on the hook – impaled through the material. A hair rig has the bait attached to a short extension of line (the hair) below the hook bend, so the hook itself remains bare. When a fish mouths the bait and ejects it, the bare hook catches on the inside of the mouth. The hair rig revolutionised carp fishing when it was developed in the 1980s and is now the standard for any boilie or pellet presentation.
What hooklink length should I use for bream feeder fishing?
30-50cm is the standard range for still water bream. Shorter (30cm) for confident-feeding fish in warm water; longer (40-50cm) for wary fish in clear water or cold conditions. Always change hooklink length if bites stop – sometimes a 10cm change is enough to produce the next fish.
How do I prevent hooklink tangles on the cast?
Use a stiff boom (coated braid with the coating intact, or heavy fluorocarbon) for the majority of the hooklink length, stripping back only the last few centimetres adjacent to the hook. The stiffness prevents the hooklink from wrapping around the mainline on the cast. For longer casts, a PVA bag or PVA mesh around the hooklink dissolves in the water after landing, ensuring a tangle-free presentation every time.