The 20 mm caliber is a common firearm bore diameter, typically used to distinguish smaller-caliber weapons, commonly called "guns", from larger-caliber "cannons" (e.g. machine gun vs. autocannon). All 20 mm cartridges have an outside projectile (bullet) diameter and barrel bore diameter of 0.787 inches (20.0 mm). These projectiles are typically 75 to 127 mm (3–5 in) long, cartridge cases are typically 75 to 152 mm (3–6 in) long, and most are shells, with an explosive payload and detonating fuze.
Weapons using this caliber range from anti-materiel rifles and anti-tank rifles to aircraft autocannons and anti-aircraft guns.

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  1. A

    Adhesive What to use for 20mm porcelain onto level block paved patio

    hi im putting 600 x 600 porcelain tiles down onto solid block paving. the paving was sealed 2 years ago with resiblock . there a few little dips here and there no more then 3 mm. i was advised to use mapei ADESILEX P4. with a 10mm notched trowel . could some one please advise. thanks ian
  2. S

    Manual cutter for 20mm x 48 inch long porcelain?

    Hello. I’m about to do a patio around a pool outside. I’ve been looking at manual scribe and break cutters for my 20mm porcelain pavers. Has anyone successfully done this in a long 48” 20mm thick tile? I’ve been looking at the Rubi TX max 1250, Sigma 3M series push 49”, masterpiuma P3 and RTC...
  3. D

    Adhesive Self Levelling Compound Has Hairline Cracks After Walking Over It. 20mm Insulation Boards Underneath - Too Much Flex?

    Hi everyone, Hope to get some help and advice please. I have laid down 8mm of self levelling compound on a concrete floor after priming it so it was a good level to work off (I also included an 8mm expansion joint around the perimeter) (Conservatory is 15 years old and area of 14 m2). I then...
  4. G

    Porcelain Cutting 20mm porcelain pavers

    Hi All. I'm just looking for a little bit of help please. I am laying a 25 sqm 800x400 patio in the coming weeks. I am going to hopefully do all my straight cuts with an angle grinder and a straight edge. I have both a 41/2" and 9" grinder and was wondering in your experience which size disc...
  5. B

    Recommended Cutter for 600 x 600 x 20mm garden porcelain pavers

    Hi, new to forum but tiled a few DIY jobs for friends and family over the years. Can anyone recommend a cutter - either wet or dry that will give me a clean cut on 20mm porcelain slabs? I was initially thinking of going with a Rubi Evo 650 with a decent blade or the Vitrex bridge saw both...
  6. G

    200 mts 20mm semi polished sandstone advice please

    hi, i am a virtually retired tiler (58), legs back hips etc etc. a friend carpenter (65) has been renovating his attached barn for around 5 years (still works full time) he has asked me to help him lay 200 mts, 20mm thick, all 500mm x 1.00mt, 900mm, 850mm down to 600mm but all @500mm one edge...
  7. F

    Adhesive Installing 20mm porcelain tiles in garden, can I use regular building sand+cement?

    As the title suggests I'm hoping to get some good advice from you folks about tile adhesive for tiling 20mm porcelain tiles in a garden. The base hasn't been prepared yet but I imagine it will be 75mm concrete to an area of 8M x 4M. Forgive my ignorance but I haven't done this before so i'm...
  8. J

    Slow cutting 20mm Porcelain

    I am using a Marcrist CK850 blade on a Rubi TC-180 wet cutter and cutting 1 meter Porcelain tiles that are 20mm thick and seem pretty tough. It takes me about 20 minutes to make a 1 meter cut using light pressure on the saw. Also, Ithe blade generates a lot of sparks. Just looking to get...
  9. L

    Is this Addy ok for 20mm marble slabs

    Customer has got this for 20mm marble floor slabs can anyone give me any feed back on it thanks not used it before thanks. Ultra Tile Fix Pro Flex Spes S1 Standard set flexi
  10. D

    20mm porcelain tiles

    Hi all Just joined the forum, have visited many times before ,when I needed advice and have always found, somebody asking same question, such a great forum with professional advice . I am a joiner by Trade so always involved with kitchens so if Tiler not available started doing...
  11. D

    Adhesive Adhesive type recomendation and thickness for 20mm porcelain outside

    I need some advice on which adhesive to use and the thickness of adhesive bed required. I want to lay 400 x 600 20mm porcelain tiles onto some concrete steps I have made outside. I read somewhere that a 20mm bed is required but that sound excessive. I have 30 of these tiles to lay. Thanks in advance
  12. Stuart Retter

    20mm Thick external porcelain, best adhesives and expansion joints

    Im about to embark on an external 20mm thick porcelain project 600x900's , I plan to use Bio gel no limits for laying has anyone used this before pros / cons I also plan to brace the expansion joints in the screed with a strip of uncoupling membrane to act as a movement joint, thoughts ? TIA
  13. A

    Is there any extra long levelling clips for 20mm porcelain

    Hi Guys, Got an outside area to be done next week in 20mm porcelain 900x600. Base is nice and flat with a good fall away to the drainage. Is there a deeper levelling clip that anyone knows of????? Thanks very much
  14. Joshjupp

    Cutting Best way to cut 20mm porcelain

    What’s the best way/ blade for cutting 20mm porcelain been cutting with a 4 inch grinder it’s taking a long time with the rubi blade and getting really hot got a few hundred cuts to do
  15. D

    Porcelquick - adped system (external 20mm porcelaine tiles)

    Hello All, I'm seriously considering using the above system, do any tilers on here have any experience, good or bad, they would like to share please? One concern I have is if there would be a noticeable hollow sound but unsure if this would travel through 20mm porcelain tiles and I'm only...
  16. D

    External concrete slab for 20mm porcelaine

    Hello All, After a few months respite I'm back. Some of you may recall my pre-Christmas dilemma with laying 30+sqm porcelain on what I thought was a unlevel slab. Well I heeded everyone's advice and got a professional tiler in who did a superb job and it turned out the floor was only 5mm lower...
  17. D

    Opinions , 20mm screed removal

    I've been to look at a screed part of which is 20mm higher than the rest . Easy option screed up , but that's going to take £700 of levelling . So options I see . Grind it , score/cut into sections with disc cutter and kango or take that piece of screed right out . Any bright ideas and options...
  18. Tile Fix Direct

    New 316 Stainless steel trims for 20mm external porcelain

    20mm external porcelain is a huge opportunity for tilers and at TileFix we are trying to make life simpler for tilers. Leaving exposed edge 20mm porcelain can be very unsightly. Grinding a profile can look great.. on through colour, but not so good on glazed. The new 20mm PorcelQuick 316...
  19. J

    ats Diamond Tools 20mm porcelain blade

    got a new blade from Alan @ATSDiamondTools this week to cut some 20mm porcelain . put it in a Rubi TC 180 and cut about 80 ln mts and was very impressed. Very clean, chip free cut in one pass.
  20. Lakey

    Cutting 20mm exterior porcelain cutting

    quock question. What is the best way to cut 20mm external porcelain? Is there a mini grinder blade that will cope? Cheers
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