Slot Width Measurement
Royal Mail Letter Size Guide Template
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- (Figures include Slots, Pit, Bingo Halls, Poker Rooms, Keno, and Race & Sports Books) sorted by size: figures in square feet: Venetian/Palazzo (combined) 243,684: strip 138,684 - Venetian 105,000 - Palazzo (approx. Size for palazzo - not in report).
- Nominal Slot Size vs available Tool Bit Sizes. The defined tolerances start with the tool bit size, these are available in standard size steps of 0.05mm. Any slot defined that does not meet this 0.05mm steps will be rounded to the nearest step. It is possible to have smaller tool bit size steps but the cost far outweighs any reason to do so.
- Nominal Size: A: W: H: F: U: J: T: Width Across Flats: Width Across Corners: Height of Head: Diameter of Washer: Thickness of Washer: Width of Slot: Depth of Slot.
- Experiments have been carried out to determine the minimum width of slots and orifices for reliable flow. For vertical slots, horizontal slots, and horizontal orifices, the boundary separating continuous and discontinuous flow is defined by slot widths greater than 4.6d, 3.3d and 6.4d respectively, where d is the characteristic dimension of the particle.
Letter, Large Letter, small parcel or parcel?
In 2006 the Royal Mail decided to follow other country’s postal system by introducing Pricing in Proportion. This was a system of charging different amounts for different size letters and packages.
Up until 2006 the Royal Mail charged by the weight of the item now it was to charge by weight and size. To enable the customers….especially business customers to access the correct size of a letter or package a Letter Size Guide template was introduced.
To begin with these were sent out by the Royal Mail in flimsy paper and if you were lucky you could get a limited cardboard version.
Today several years later there are many different versions of the Royal Mail Letter size guide available. See here for a selection.
Slot Width Measurement Calculator
Most of the letter size guides are made from perspex and do have ability in some cases to break or split easily. However the Royal Mail have there own modern version made of very strong plastic and you can see these in the Post Offices up and down the country. You can also buy these Royal Mail Letter size guides and in deed the other versions from Ebay and Amazon.
The first slot is for all mail in letter size, usually a DL, not being thicker than 5mm. The letter MUST pass freely through otherwise it may be considered a Large Letter.
Large letters must again pass through without getting stuck and goes up to 25mm in thickness.
If your mail does not fit either slot it is then becomes a small or large parcel.
Small parcel is items to be posted up to the size of 2 kg in weight, 35cm in length, 25cm in width and 16cm in length. Any thing bigger is a Large Parcel.
Letter size guide s are very useful to anyone who send s out post on a regular basis. Especially Offices, Schools, Doctor Surgery’s, Dentists etc. Even if you have a Franking Machine,as they do not have a Letter Size guide supplied with them. Many members of the public have a Letter Size guide so they can make sure the birthday card with a cheeky badge on it is sent with the correct postage on it.
If the letter or package does not have the correct postage on it the recipient can only obtain the letter by paying an extra £1.20plus the difference of postage between what was placed on the package and the next 2nd class price point.
Pricing in proportion only affects mail posted in the UK going to an UK address. This includes the Channel Islands, Isle of Man and Northern Ireland.
The slots on the letter size guide are not required for mail being sent to Europe or Internationally. This includes the Republic of Ireland.