It really depends on what your using. Rune scim is probaly a 16 MAX.
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i hit around 15 with rune scimitar with 61 strength and 57 attack
If you have lvl 56 strength you can hit up to 17 depending on what you've got. If you have Amulet of strength and strength potion and 31 prayer, then you can hit about 17 with Rune 2h Sword.
The person before Me was a complete idiot, the max at the moment with: 99 Attack 99 Strength + Super Set +Max Bonus +Piety Max hit with Whip is 52, and with any GodSword W/O Spec is 61, with is 93 with an AGS. If your on a slayer task, 10% more. so 57 with a whip and W/O Spec GS 67.
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you can go to http://www.runehq.com/guide.php?type=calculator&id=00712 and enter your levels and such, it will find your max hit.
input your weapon and other equipment you will be using: http://www.scape-xp.com/runescape-max-hit-calculator.html
amulet of strength is always a better choice in f2p, your max with it will always be higher than if you have on zealots, according to a max hit calculator. strength ammy is also better for training, and is easy to replace.
Depends on if you pot your skills or the weapon you have and your strength level.
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If you had 99 Constitution, and you also had lowest LP, you would be able to hit a 589.
Attack, Strength, and possibly defence because of these raises your character's level which in turn raises your max hit. It also changes depending on what weapon you use.