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Stage 8 8911A Locking Header Bolt Kit 3/8-16 x 1 Inch

(Audi S4 2000-03, A4 Quattro 1997-2000, 2002-13, A6 Quattro 2000-03, 2005-08, 2012-13, Q5 2009-10, 4000 1979-87; GMC G2500 1979-95 + 187 more models)

Part of: Stage 8 Locking Header Bolt Kit

Other options in this family: Stage 8 8911 Stage 8 8910A Stage 8 8913 Stage 8 8912A Stage 8 8914

Manufacturer

Picture for manufacturer Stage 8

Part Number

8911A
13 reviews
Sale Price

$79.74

2 left at this price

delivery box

Usually delivered within 2 days

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FREE SHIPPING

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No Hassle Returns

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Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Stage 8 8911A Locking Header Bolt Kit provides a proven solution to prevent header bolt loosening that can lead to exhaust leaks, gasket failure, and power loss. This 12-piece kit is engineered for high-performance applications where vibration and thermal cycling threaten fastener integrity.

Kit Specifications:

  • Thread Size: 3/8-16
  • Bolt Length: 1 inch
  • Head Style: 6-point double hex head (DHH)
  • Quantity: 12 pieces (complete hardware included)
  • Material: 4130 alloy steel construction

Patented Locking System:

  • Three-piece design: bolt, locking retainer, and spring clip
  • Positive mechanical lock prevents backing out from vibration
  • Reusable design for repeated installations
  • No thread damage or deformation

Stage 8's trademarked locking fastener system is easy to install and provides reliable protection against loose header bolts. The 4130 alloy steel construction offers excellent strength and heat resistance for demanding exhaust applications. Each kit includes all necessary hardware for a complete installation.

Products specifications

Fits

Audi S4 2000-03, A4 Quattro 1997-2000, 2002-13, A6 Quattro 2000-03, 2005-08, 2012-13, Q5 2009-10, 4000 1979-87; GMC G2500 1979-95, K1500 1979-99, C1500 1979-99, K2500 1979-2000, Jimmy 1970-91, Savana 2500 1996-2002 + 182 more models

Fastener Finish

Nickel plated

Fastener Material

Steel

Fastener Style

Bolt

Head Style

Double hex head

Quantity

Sold as a set of 12.

Thread Size

3/8-16 in.

Underhead Length (in)

1.000 in.

Very accurate service Thanks .

Grate stuff

Great price and fast shipping!

Easy to navigate

So glad you have the part I needed! Easy to use your webpage and so glad you accept Amazon pay method! If the wiper arrives soon and as expected you will have won a new customer! Also the coupon was very convincing! Good job!

no core and free shipping. Incredible! now if it gets here before the 21st i will be in business!

Was very pleased with the hubb filter i ordered, product is very well made and i can't wait to put it to use.

Great products and price and car fitment check

No way to contact for more information,not no pictures of real idome

Easy and quick

Great pricing and quick shipping. GREAT

Awsome service and prices,Thanks alot

Very fast process, just hoping it's the right item. The description was not very good.

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