Well I saw your post and decided to test some stuff a hour ago, and noted all info about the weapons here:
--------------------------------------
§ MELEE §
--------------------------------------
Total Life: 100 HP
Fire rate values are probably unaccurate, but are a good base.
Fists are slightly faster than any weapon with 3 hits in 0,75 seconds, as every weapon deals 3 hits in 0,85 seconds.
Grenade, molotov, mine and c4 throw damages are always 1 HP.
(I hadn't patience to make more complete and precise data, but that's what I got by script testing)
No Weapon
Fist: 8,5 HP
Kick: 3 HP
Grab Punch: 17 HP
I don't remember if the script calculates per 200 ms or 250 ms, I'd say it's 200 ms, but I don't know if I'm right.

Fire 1: 1,5-1,6 HP per 200 ms [If I remember well, that's like 7,7 HP per second]

Fire 2: 5,7-5,9 HP per 200 ms [If I remember well, that's like 29,5 HP per second]

Explosion: 70 damage as its max (a grenade/mine/c4 alone), it changes depending on the range
Melee Weapons
Baton: 10,5 HP | Throw Damage: 10,5 HP
Pipe Wrench: 11 HP | Throw Damage: 11 HP
Hammer: 11,5 HP | Throw Damage: 11,5 HP
Baseball Bat: 11,5 HP | Throw Damage: 11,5 HP
Chain: 11 HP | Throw Damage: 11 HP
Knife: 12 HP | Throw Damage: 35 HP
Machete: 12,5 HP | Throw Damage: 30 HP
Fire Axe: 14 HP | Throw Damage: 30 HP
Katana: 15 HP | Throw Damage: 30 HP
Makeshift Weapon
Suitcase: 22 HP | Throw Damage: 17-19 HP (Strong, uh, but only 1-hit-durability)
Chair: 18 HP | Throw Damage: 14-17 HP
Chair Leg: 9 HP | Throw Damage: 9 HP
Bottle: 10 HP | Throw Damage: 10 HP
Broken Bottle: 14 HP | Throw Damage: 14 HP
Trash Bag: 8,5 HP | Throw Damage: 1 HP
Trash Can Lid: 18 HP | Throw Damage: 1 HP
Teapot: 10 HP | Throw Damage: 10 HP
Pillow: 1 HP | Throw Damage: 1 HP
Flagpole: 11 HP | Throw Damage: 11 HP
Cue Stick: 17 HP | Throw Damage: 18-19 HP
Broken Cue Stick: 9 HP | Throw Damage: 9 HP
--------------------------------------
§ SECONDARY WEAPON §
--------------------------------------
Pistol: 8 HP | Throw Damage: 10 HP | Fire Rate: 200 ms
Silenced Pistol: 7,5 HP | Throw Damage: 10 HP | Fire Rate: 200 ms
Uzi: 4,5 HP | Throw Damage: 11 HP | Fire Rate: 67,5 ms
Silenced Uzi: 4,25 HP | Throw Damage: 11 HP | Fire Rate: 67,5 ms
Revolver: 18 HP | Throw Damage: 10 HP | Fire Rate: 675 ms
Magnum: 25 HP | Throw Damage: 10 HP | Fire Rate: 945 ms
Flare Gun:

| Throw Damage: 10 HP
--------------------------------------
§ PRIMARY WEAPON §
--------------------------------------
Carbine: 9 HP | Throw Damage: 15 HP | 200 ms
SMG: 6 HP | Throw Damage: 15 HP | Fire Rate: 94,5 ms
Tommygun: 6,5 HP | Throw Damage: 15 HP | Fire Rate: 94,5 ms
Assault Rifle: 7 HP | Throw Damage: 15 HP | Fire Rate: 94,5 ms
Grenade Launcher:

| Throw Damage: 8-14 HP
Bazooka:

| Throw Damage: 4-14 HP
Sawed-Off Shotgun: 22,19 HP | Throw Damage: 12,5 HP | Fire Rate: 100 ms (I'm pretty unsure about this, I can recheck whenever I have time)
Pump-Action Shotgun: 22,19 HP | Throw Damage: 14-15 HP | Fire Rate: 945 ms
M60: 8 HP | Throw Damage: 10-15 HP
Flamethrower:

| Throw Damage: 10-15 HP