ARP 218-4701 Mazda Miata Head Stud Kit
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(1.6 and 1.8) Built for the Mazda Miata... Obtaining the optimum cylinder head-to-block sealing is especially critical in small displacement engines employing high compression pistons or power adders like turbochargers, nitrous oxide and superchargers. That's why ARP head studs are popular among leading Sport Compact/Import racers.You should know that ARP uses a premium grade 8740 alloy that is rated far superior to "aircraft" quality. Then, each stud is precisely heat-treated to 200,000 psi. Following heattreat, each stud is centerless ground to make it as close to perfectly concentric as possible. This procedure involves about ten very slight cuts and results in an exceptionally straight part. It's important to note that lesser quality studs are not even centerless ground the material is thread rolled in bar stock form (mostly before heat-treat, when the material is easier to machine). Because ARP studs are manufactured to such exacting tolerances, you will note that gaskets and cylinder heads literally glide into position and are perfectly aligned something that won't happen with inferior quality head studs.ARP studs are thread rolled after heat-treat, which gives them about 1000% (that's ten times) better fatigue strength than those studs that are threaded prior to heat-treat.You will also note that ARP offers specially undercut studs for several engines. This procedure (done only to the shorter studs) more equalizes the "stretch" of both studs, which makes for a more consistent clamping force one that compensates for head gasket compression when the head is installed. This helps prevent blown head gaskets, and assures optimum sealing! ARP 218-4701 is a Mazda Miata head stud kit featuring premium 8740 alloy steel studs, M10x1.25 thread, painted exterior finish and hex head style. Kit is vehicle-specific for Mazda Miata 1.6 / 1.8 engines and includes head stud & bolt components. Package weight ~2.35 pounds; package dimensions 5.588 H x 21.843 L x 10.668 W (centimeters).
- Fit Type: Vehicle Specific
- Made in USA
- Package Weight: 2.35 pounds
- Package Dimensions : 5.588 H x 21.843 L x 10.668 W (centimeters)
Specifications:
| Materials & Construction | |
| Color | Black |
| Exterior Finish | Painted |
| Material | 8740 alloy steel |
| Material Type | 8740 alloy steel |
| Metal Type | 8740 alloy steel |
| Product Details | |
| Included Components | Head Stud & Bolt Kits |
| Item Type Name | Head Stud & Bolt Kits |
| Item Type Name (Category) | Head Stud & Bolt Kits |
| Number of Pieces | 1 |
| Set Name | ARP Head Stud Kit - Mazda Miata |
| Size Name | Stock |
| Unit Count | 1.0 Count |
| Warranty Description | Manufacturer warranty |
| Sizing & Dimensions | |
| Height | 2 inches |
| Length | 9 inches |
| Product Dimensions | 9 x 4 x 2 inches |
| Size | Stock |
| Weight | 2 pounds |
| Width | 4 inches |
| Technical Specifications | |
| Compatible Groove Diameter | 1.75 Inches |
| Drive System | Rear-Wheel Drive |
| Fastener Size | M10 |
| Fastener Type | Stud |
| Finish Types | Painted |
| Grade Rating | Grade 8740 |
| Head Style | Hex |
| Head Type | Stud |
| Item Hardness | Grade 8740 or Rockwell Hardness around 30-36 HRC |
| Item Hardness (rating) | Grade 8740 or Rockwell Hardness around 30-36 HRC |
| Manufacturer Grade | Grade 8740 |
| Maximum Shear Strength | 120,000 PSI |
| Screw Head Style | Hex |
| Screw Point Style | Type A |
| Set Screw Thread Type | Metric Fine |
| Thread Class | 3A |
| Thread Coverage | Partially Threaded |
| Thread Size | M10x1.25 |
| Thread Style | Metric Fine |
| Thread Type | Metric Fine |
