Bolt Kit - 12pt. (5) 1/4-20 x 1.250

The ARP Bolt Kit – 12pt. (5) 1/4-20 x 1.250 (SKU ARP640-1250) delivers OEM-grade fastening for precision assemblies where strength and consistency matter. This five-piece set of chromoly bolts in black oxide finish addresses the core requirement of any high-reliability build: dependable hardware that won't shift, loosen, or corrode under operational stress. Chromoly construction provides superior tensile strength compared to standard steel, while the black oxide coating resists surface corrosion in field environments without adding bulk or weight.

Each bolt measures 1/4-inch diameter with a 20 threads-per-inch (TPI) specification—a standard metric in precision firearm assembly, upper receiver builds, and modular weapon platforms. The 1.250-inch length and 12-point head design enable controlled torque application without rounding fastener corners, critical when working with fixed receiver pockets or cross-pinned components. The 5/16-inch 12-point head accepts standard aviation tools and torque wrenches, ensuring repeatable installation tension across multiple build iterations. At 0.16 lbs total for the set, weight is negligible, but the material profile is not—chromoly bolts retain their dimensional stability under the vibration and thermal cycling that loose fasteners cannot tolerate.

Builders and armorers rely on matched fastener sets for receiver assembly, rail attachment, and modular platform construction where bolt spec consistency prevents assembly-induced point-of-impact shift or mechanical play. The universal design integrates with AR platforms, precision rifle builds, and tactical optics mounting where 1/4-20 threading is standard. Five pieces provide coverage for a complete bolt-up job with spares for future rebuilds or repairs. This is the hardware choice when commercial fastener bins won't do—verified material grade, controlled finish, and dimensional repeatability that keeps zero and reliability intact across operational cycles.