7.62 mm M13 disintegrating belt links. Manufactured in India.

Why the link is the belt

In the disintegrating-link system that NATO standardised, each M13 link grips one 7.62×51 mm round around the case body and hooks through the loops of the adjacent link over the next round. The belt is therefore nothing but rounds and links; there is no separate carrier to recover. As the weapon feeds, the extraction of each round frees its link, the link falls away, and the belt disintegrates — which is what allows continuous feeding at the full rate of fire without a growing tail of empty belt.

This puts remarkable demands on a stamped part that weighs roughly four grams. Loop geometry controls feed alignment; the spring temper controls grip force; the phosphate finish controls corrosion. Every one of those properties is verified per lot — by a sustained-load belt test, a free-hinge articulation test, Vickers hardness and salt-spray checks, and ultimately by live firing in the service weapon, where our production lots recorded zero stoppages with every fired link recovered intact.

Manufacturing links in bulk without drift

Link production is progressive-die stamping at its most disciplined. The strip is cold-rolled, bright annealed spring steel to IS 2507, accepted against mill test certificates and re-verified through government NABL-accredited laboratories — lot-wise, before the first blank is cut — for chemistry, hardness, grain size, and decarburisation. The progressive tooling forms the loops, dimples, and tab in sequence with controlled grain direction, and the stamped links are then oil-hardened and tempered to their specified spring condition.

The failure modes worth engineering against are quiet ones — die wear that walks a loop diameter out of tolerance over a hundred thousand strokes, or a tempering drift that leaves links brittle. The countermeasures are equally quiet: 100% visual, dimensional, and gauge inspection before phosphating across every controlled characteristic, lot-wise hardness sampling, DEF‑131A acceptance sampling, and stage inspection records witnessed by the service QA agency that make any drift visible while it is still correctable.

Licence basis and component scope

Neometrix manufactures the empty metallic component — the link — not filled ammunition. Belting with live rounds and functional firing are conducted under the service's own authority as part of acceptance. This keeps the programme squarely within component-manufacturing scope while still delivering a product that is qualified, end to end, in the weapon it will serve.

The indigenisation context

Belt links are consumed continuously in peace and war, and every lot manufactured domestically is a lot that no longer depends on a foreign production line. Policy has moved decisively — Buy-Indian preference under DAP‑2020, positive indigenisation lists that bar imports of listed items after set deadlines — and this programme was built for, and proven under, Indian defence quality assurance inspection: the naval inspection authority witnessing every stage from raw-material release to live firing.