A wiring loom is only as good as the hardware that keeps it routed correctly and protected against the abrasion, heat and vibration that any classic engine bay sees. The Electrical Fixings section covers the cable ties, grommets, P-clips and assembly hardware that complete a properly-installed loom, the small items that make the difference between a harness that lasts the working life of the car and one that develops chafing damage and shorts within a few seasons.
Cable Ties in the Right Sizes
Cable ties (also known as zip ties or wire ties) hold the loom bundled together at the right points, secure the harness to chassis mounting points, and pull together the various branches of the loom into a tidy installation. The size matters: a tie too small lacks the breaking strength needed to hold the bundle securely; a tie too large leaves an oversized excess tail that needs cutting and produces an untidy result. The range covers the typical sizes used across classic-MG loom work, small ties for individual wire bundles, medium ties for main loom runs, and the larger ties for securing the loom to chassis points or engine-bay mountings. Black UV-resistant ties are the standard for under-bonnet use where sunlight exposure would otherwise embrittle the plastic over time.
Grommets and Bulkhead Pass-Throughs
Where a loom passes through a steel panel, the bulkhead between engine bay and cabin, the door pillar from the body to the door, the firewall pass-throughs for various circuits, a grommet is essential to protect the wires from chafing against the panel edge. A bare wire passing through a punched hole in steel will eventually chafe through its insulation under vibration, producing a short circuit that is difficult to diagnose because the fault is hidden inside the bulkhead pass-through. Grommets are stocked in the rubber and nitrile specifications used through classic-MG production, sized to the hole diameter in the panel and to the loom bundle passing through.
Where the original grommet has hardened or split with age, renewing it as part of any loom work is essential.
P-Clips and Assembly Hardware
P-clips covered under their own dedicated section (P Clips, parent 4111) are the rubber-lined steel clamps that secure the loom to body, chassis and engine. The Electrical Fixings section covers the smaller P-clip sizes specifically suited to cable runs, alongside the supporting hardware, the panel screws, body clips, and self-tapping fasteners that hold the P-clips in position. The hardware specification matches the loom routing, typically self-tapping screws for body-panel fixings, machine screws for engine-bay mountings, and the various small specialist fasteners that the original factory loom installation used. Renewing the P-clip hardware alongside the loom itself ensures the harness sits in its original position throughout its service life, avoiding the gradual drift toward chafing points and heat sources that comes with corroded or missing original hardware.