ARP 12-point bolts sized 3/8-16 with a 1.000in length and a 7/16 wrenching hex for access in tight-clearance areas. The black oxide finish adds corrosion resistance. Supplied as a 5-pack.
Specifications
| Type | 12-point bolt |
| Thread | 3/8-16 |
| Length | 1.000 in |
| Wrenching | 7/16 |
| Finish | Black oxide |
| Size | (5 Pack) |
| Part Number | 644-1000 |
Shipping
- In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
- Standard, expedited, and overnight options at checkout.
- Oversized items ship by freight and take longer.
- Backordered items ship as soon as stock lands — contact us for lead times.
- International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.
Returns
- 30-day returns on new, uninstalled items in original packaging with all hardware.
- Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
- Installed or used parts can’t be returned — confirm fitment before you install.
- Special orders and custom items are final sale.
- Email us for return authorization before shipping anything back.
Full details: Shipping Policy · Refund Policy
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