"more stringent specifications" is correct and can be used in written English.
An example sentence would be: "The company has implemented more stringent specifications for environmental safety on its production lines."
The automaker said the latches met federal safety standards but did not meet its own, more stringent specifications.
It is anticipated that the focus on fluidity of jet fuel at low temperatures will increase in the near future and that more stringent specifications may be applied to jet fuel products.
An estimate of the LOE required to process the VMap0 and selected data layers of the DCW based on more stringent specifications are provided, on a layer by layer basis, in Appendix A of this publication.
The fluidity properties of jet fuel mixtures at low temperatures are critical in understanding and mitigating the safety risks and performance attributes of aircraft engines, which may lead to the introduction of more stringent specification limits in the near future.
Numerical examples show that the switching control strategy can cope with more stringent design specifications than the fixed gain strategy, being useful to improve the performance of this class of systems.
Nevertheless, this may confer advantages in some applications if more stringent edge-specifications have to be met.
Note that a DUS may set more stringent and/or more specific requirements.
Within the petroleum refining and petrochemical industries, catalysts provide the opportunity for drop-in solutions for addressing ever more stringent product quality and environmental specifications.
Many common types of optical glass are now available in quite large pieces, but as the specifications of the glass become more stringent the cost rises and the range of available sizes becomes limited.
Since 1941, superhighway construction, with stringent specifications for road crown height and drainage, created more opportunities for transport, and also created new habitat in the often damp roadsides.
Drug specifications for use in resource-limited settings may be more stringent than for developed countries as issues such as treatment durability, feasibility of manufacturing fixed-dose combination, and the possibility of being used without biological or virological monitoring are even more important.
