STAINLESS STEEL AFNOR FLAT WASHERS NFE 25-514 TYPE L

AFNOR Flat Washers NFE 25-514 Type L — Type L continues the same size progression as Types Z and M within NFE 25-514, stepping up again in outside diameter and thickness to give more bearing area than the medium series provides, without going all the way to the widest LL option. It is specified where the standard M series genuinely does not offer enough load-spreading capacity for the clamped material or hole condition - softer substrates, larger-than-normal clearance holes, or joints working closer to their rated preload than typical general assembly - but where the very largest AFNOR washer would be more than the application actually needs. That makes it a middle-ground choice in the same way ISO 7093-1 serves a similar large-series role in the ISO system, though the two standards are set independently, so dimensions should not be assumed to match across systems without checking the tables. As with the rest of the NFE 25-514 range, Type L is really only relevant where a project is genuinely built to AFNOR standards; if the drawing or equipment specification is DIN or ISO-based, the equivalent large-series washer in that system - DIN 9021 or ISO 7093-1 - is the more directly applicable reference rather than switching standards systems partway through a build. Material selection follows the same general logic across the whole AFNOR flat washer range: mild steel with plating for indoor and general use, A2 (304-equivalent) stainless as the default for outdoor or washdown environments, and A4 (316-equivalent) reserved for marine, coastal, or chemically aggressive settings where the extra bearing area of a large washer would otherwise present more surface for chloride-driven pitting on a lesser grade. To choose correctly, confirm the bolt diameter and check whether the application genuinely needs the larger L series rather than defaulting to it without checking if Type M would suffice.

FAQs
How does Type L compare to Type LL?
Type LL provides an even larger outside diameter than Type L, representing the widest, most heavy-duty option in the NFE 25-514 range; Type L sits between the medium (M) series and the extra-large (LL) series.

How does Type L compare to ISO 7093-1?
Both serve a similar large-series, load-spreading role, but dimensions are set independently by AFNOR and ISO, so the two should not be treated as directly interchangeable without checking the tables.

When would Type L be specified over Type M?
Where the standard medium-series washer does not provide sufficient bearing area for the clamped material or hole condition, without needing to go to the largest LL series.