How much HP does a helmet have?

[ZZTRaider]

Looking at Dwarven feats and equipment, I came across these two:

Feat: Dented Helm (Combat, Dwarf)

Dented Helm text:

Dented Helm (Combat, Dwarf)
Your helm protects you from hard hits.
Prerequisites: Hard-Headed, base attack bonus +6, dwarf.

Benefit: When wearing a helmet, you add +1 to your AC against critical hit confirmation rolls. When a critical hit is confirmed against you, as an immediate action, you can apply half of the damage from the attack to your helmet rather than yourself, applying hardness as normal. If the damage destroys your helmet, any leftover damage is applied to you. After using this feat, you are staggered until the end of your next turn. You may not use this feat if your helmet has the broken condition or the attack ignores armor bonuses to AC.

Weapon: Dwarven Boulder Helmet

Dwarven Boulder Helmet text:

Benefit: This heavy, reinforced helmet can be used to make melee attacks. The wearer may use the helmet when attempting bull rush maneuvers, granting a +2 circumstance bonus on the check, but after completing the maneuver (whether successful or not), the wearer is staggered until the end of his next turn.

In addition, a dwarven boulder helmet grants a +2 circumstance bonus to the wearer's AC against critical hit confirmation rolls. A dwarven boulder helmet can be enchanted as a weapon (not as armor, despite providing some protection).

A dwarven boulder helmet adds 20% to the wearer's arcane spell failure chance. It occupies the head slot and is made of metal, not stone, meaning that it can be crafted from unusual materials as a metal weapon.

It seems clear that these are intended to be used together. Without using the optional piecemeal armor rules, I'm not actually sure how you'd get a helmet otherwise, other than any head slot magic items described as a helmet.

So, neat, I can apply critical damage to a helmet to avoid taking so much. But, what's the HP for a helmet? None of the entries on the HP/Hardness table really seem to fit a helmet. The Dwarven Boulder Helmet is a light weapon, but it's neither a blade nor a hafted weapon. It's also not really armor (though it does provide AC against critical threats).

Anyone aware of any information I may have missed?

[ZZTRaider]

Seems that nobody has any answers. I'd appreciate people marking for FAQ, if you don't mind.

In the meantime, I think I'll just treat it like a buckler for HP/Hardness.

[Happler]

Best guess. From the Additional Rules section of the core book:

Steel has a hardness of 10 (+2 for each +1 magical enhancement bonus it has) so the basic boulder helmet should have a hardness of 10 (assuming it is steel).

for its hit points, I would go with: 10 hp. (It adds a +2 AC vs crits, I am okay using that AC for the hit points of armor (AC x5))

I would give 5 AC for a standard helm, but a boulder helm states that it is reinforced.

Note, this is not RAW, but my best guess.

[KainPen]

RAW depens on thickness and materals of the helment. which is GM area, GM figures out how thin or thick it is and use tables for that. it I would think not be any thicker then 1/2 inch at the most.

[Ciaran Barnes]

For the sake of simplicity make it the same as a shield.