Hubbell is a bit unusual actually, using contacts in their 15 amp receptacle that would not, in any way, accept a 20 amp male plug even if the faceplate of the receptacle had the T slot with at least a few of their models (Spec grade 5262/5362 and hospital grade 8200/8300 for example).
Contact surface area on the neutral side of the male plug (using a 15 amp male plug into the 15 amp receptacle) is increased by about 40% in this case, as opposed to using the "universal" contact allowing 15 or 20 amp males to be used.
So, in that case, there may actually be a disadvantage to using the 20 amp receptacle with a 15 amp male. I say may, because, if I remember correctly (just to totally confuse the issue), the Hubbell 8200H/8300H DO use a universal contact that will accept both 15 and 20 amp males if the T-slot is there.
The 8200H/8300H is a slim line, non plated contact hospital grade and my favorite in the Hubbell line up, although I do have in use (and experience with) the 5262/5362 and I'd say performance and grip are pretty close.
Contact surface area on the neutral side of the male plug (using a 15 amp male plug into the 15 amp receptacle) is increased by about 40% in this case, as opposed to using the "universal" contact allowing 15 or 20 amp males to be used.
So, in that case, there may actually be a disadvantage to using the 20 amp receptacle with a 15 amp male. I say may, because, if I remember correctly (just to totally confuse the issue), the Hubbell 8200H/8300H DO use a universal contact that will accept both 15 and 20 amp males if the T-slot is there.
The 8200H/8300H is a slim line, non plated contact hospital grade and my favorite in the Hubbell line up, although I do have in use (and experience with) the 5262/5362 and I'd say performance and grip are pretty close.