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This ARP performance fastener, stud, bolt, tool, or assembly is the 1/4-20in SS 12pt Nut Kit (10/pkg). Confirm the exact engine or vehicle application, thread size, length, material, strength series, included quantity, installation lubricant, tightening sequence, and current ARP torque specification before ordering.
Key Features
- Thread, length, material, strength series, and included quantity are exact-part specific
- Engine, vehicle, component, and installation requirements must match the current ARP application
- These nuts fit GM LS series engines found in Corvettes Camaros Silverados and more used on timing covers headers valve covers and accessory brackets.
- The 12-point design delivers reliable torque application while stainless steel construction handles heat moisture and vibration in demanding builds.
Fitment
| Years | Make | Model | Application |
|---|---|---|---|
| Universal or specification-matched application. Verify every dimension, interface, load or operating requirement, and listing note. | |||
Specifications
| Brand | ARP |
|---|---|
| Manufacturer Part Number | 401-8340 |
| Product Type | Hardware Kits - Other |
| Condition | New |
| Configuration | 1/4-20in SS 12pt Nut Kit (10/pkg) |
| Stainless Steel Material | Resists corrosion and maintains integrity in engine bays exposed to coolant oil and exhaust gases |
| 12-Point Head Design | Offers 12 contact points for wrench or socket engagement preventing slippage and nut rounding during high-torque assembly |
| 1/4-20 Thread Size | Matches ARP studs and bolts on LS timing covers headers and manifolds for precise thread engagement and clamping force |
| 0.500in Nut Height | Provides adequate thread engagement in space-constrained areas without interfering with components |
| 10-Piece Kit Packaging | Supplies exact quantity needed for common jobs like header installs or cover replacements saving time and cost |
| Q | What type of stainless steel is used? A: ARP uses high-grade 300 series stainless steel with strength ratings exceeding 100000 psi and excellent resistance to galling and stress corrosion |
| Method | UPS Ground or USPS Priority Mail |
| Availability | In stock - ships same or next business day |
| Packaging | Compact 6 x 4 x 1 inch box with protective insert |
| Weight | 0.2 lbs |
| Features Stainless Steel Material | Resists corrosion and maintains integrity in engine bays exposed to coolant oil and exhaust gases 12-Point |
What's Included
One new ARP hardware kits - other in the exact configuration and quantity identified by this listing. Brackets, wiring, air lines, fittings, switches, fasteners, fitting kits, fluids, covers, and accessories are included only when expressly stated for this exact part.
About ARP
Automotive Racing Products manufactures high-performance studs, bolts, nuts, washers, wheel hardware, assembly tools, and installation lubricants for engine, drivetrain, chassis, and racing applications. Thread dimensions, material, preload method, lubricant, torque, and included quantity remain exact-part specific.
Important Disclosures
- California Proposition 65 warning applies. Review the current manufacturer warning before handling or installation.
Related Parts
- Shop all ARP products
- ARP .875in OD x 7/16in ID Insert Washers (10 pack)
- ARP 01-06 6.6L GM Duramax Diesel Flywheel Bolt Kit
- ARP 01-10 6.6L GM Duramax Diesel Flexplate Bolt Kit
Frequently Asked Questions
How do I confirm the 1/4-20in SS 12pt Nut Kit (10/pkg) fits my application?
Match the exact engine family or vehicle, component location, thread diameter and pitch, under-head length, material, strength series, and every current ARP application note.
Can I reuse the factory torque value with this ARP hardware?
Not automatically. Use ARP's current instructions for the exact part, material, lubricant, tightening sequence, and preload method. Factory torque values may be based on different hardware and friction.
What is included with this ARP kit?
Only the studs, bolts, nuts, washers, lubricant, and tools expressly listed for this exact part number are included. Verify the required quantity before disassembly.
Installation Instructions
- Confirm ARP part number 401-8340, the complete application, and every required supporting component before beginning work.
- Clean and inspect all mating threads and components, then verify thread engagement, length, washers, nuts, lubricant, and required preparation before assembly.
- Follow ARP's current tightening sequence, lubricant instructions, torque or stretch method, and any retorque procedure for this exact part.
- Verify clearance, preload, fastener seating, and normal component operation before returning the vehicle or engine to service.
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