Why ARP Stainless Hex Bolts?

Cheap hardware:

• Rusts quickly
• Strips under load
• Doesn’t hold torque consistently

ARP Fixes That:

• Stainless steel construction – corrosion-resistant for long-term use
• Hex head design – simple install with standard sockets
• Precision threads – smooth engagement and accurate torque
• Consistent finish – clean, uniform appearance

Translation: stronger, cleaner, and not embarrassing to look at.

Now You’ll use premium quality ARP fasteners to put in so much anything on a car, boat, or trailer. You’ll’t beat the beautiful looks of the specially polished chrome steel bolts, and their ability to withstand rust.

Universal Fitment (3/8-16 Applications)

The 3/8-16 thread with 1.250” length is one of the most common sizes across automotive builds:

Common Uses:

• Engine accessories and brackets
• Intake manifold components
• Water pump and alternator mounting
• Transmission and bellhousing hardware
• Suspension and chassis mounting

Popular Platforms:

• Small Block Chevy / Ford builds
• LS swap accessory mounting
• Classic muscle cars and hot rods
• Custom fabrication projects

If it uses 3/8-16 hardware, this is a direct upgrade.

They are really maintenance free. Nominally rated at 170,000 psi tensile strength, this hardware provides a substantial extra margin of safety over Grade 8 hardware, and the bolts are conveniently packaged five to a card.

ARP 623-1250 stainless 3/8-16 x 1.250 hex bolt kit – Key Features

• Thread Size: 3/8″-16 (RH thread)
• Length: 1.250” under head
• Head Style: Hex
• Material: Stainless steel
• Finish: Natural polished stainless
• Quantity: 5 bolts per pack

Performance Benefits

• Prevents rust and corrosion
• Improves thread engagement and torque consistency
• Enhances overall build quality and appearance
• Provides long-term durability under load

No more swapping out bolts every time they start looking questionable.

These bolts feature a traditional hex style head, have a diameter of 3/8″, an ordinary thread pitch of 16, an under head length of 1.250, and the wrenching is 3/8.

Bolts have a diameter of 3/8″, an ordinary thread pitch of 16, an under head length of 1.250, and the wrenching is 3/8
Rated at 170,000 PSI, which is considerably stronger than Grade 8 hardware

Installation Notes

• Use proper torque specs for 3/8-16 hardware
• Apply anti-seize lubricant (stainless threads can gall)
• Ideal for:
  • Engine bay refresh
  • Custom installs
  • Replacing worn OEM hardware

Why ARP 623-1250 stainless 3/8-16 x 1.250 hex bolt kit?

Because even basic hardware:

• Matters under vibration and heat
• Impacts long-term reliability
• Is easier to upgrade now than fix later

Manufactured from polished Stainless 300 steel, a proprietary alloy that may be impervious to rust and corrosion
Heads are traditional hex style
Packaged on convenient 5-pack card

Final Verdict

The ARP 623-1250 stainless hex bolt kit is a simple, reliable upgrade for any build needing strong, corrosion-resistant 3/8-16 hardware.

Clean, durable, and way better than whatever random bolts you were about to use.