Market Data

Fastener Prices Have Their Own Index, and It Doesn't Track Steel One-for-One

Everyone quoting an assembly watches steel. Almost nobody watches the fastener index, which is a mistake, because fasteners have their own published price series and it moves on its own schedule.

Fasteners are the C-parts of manufacturing: cheap each, invisible on the BOM, and collectively a bigger line than anyone expects on a high-count assembly. They also have their own producer price index, for bolts, nuts, screws, rivets, and washers, which reads 328.58 index (1982=100) as of Jun 2026, down about 4.2% from a year ago. Most buyers assume fastener prices simply follow steel, and over long spans they roughly do, but month to month the two indices diverge in ways that matter to anyone buying hardware by the barrel.

Why fasteners lag steel

Steel mill products index at 361.44 index (1982=100) (Jun 2026), up about 16.9% from a year ago, but the fastener index moves with a lag and a damping, for three reasons. First, wire rod (the fastener feedstock) is a step removed from the mill products the steel index tracks. Second, a large share of fastener supply is imported, so global fastener capacity and freight, not just domestic steel, set the price. Third, fastener makers hold inventory and forward contracts that smooth the pass-through. The result is a spread that tells you whether a fastener price increase is really steel arriving late, or something specific to fastener supply like an import disruption.

The fastener is the cheapest part in the assembly and the one most likely to be quietly repriced without anyone checking whether the increase is real.

What the spread does for an assembly buyer

On a product with hundreds of fasteners per unit, a small percentage move in hardware cost is a real number at volume, and it usually slips through because no single line looks big enough to audit. Watching the fastener index changes that: when a distributor raises prices, the index says whether the market moved with them. When steel spikes but the fastener index has not caught up, it is a signal to lock hardware pricing before the lagged increase arrives. The index turns the least-watched line on the BOM into one you can actually manage.

The overlooked line, six years of it

Over the 36-year record fastener prices have moved decisively rather than oscillated: from 116.70 at the close of 1990 to 328.58 today, up 182%, and now the lowest since February 2024. A change of that size across a span this long is a level shift, not a cycle, and planning that assumes a return to the 1990 figure is planning against the whole record.

Use the cost per thousand fasteners calculator to turn the current index into your assembly's real hardware line. Cost the hardware

Published 2026-08-05.