84-1239 Screw Bolt – 8-32 x 1-5/16" Hex Washer Head w/ Insulator – Thread Forming, Dog Point

Upgrade or replace your fastener with this 84-1239 screw bolt, engineered for durability, precision fitment, and reliable performance in demanding automotive and industrial applications. Designed with a hex washer head and integrated insulator, this bolt ensures secure fastening and proper electrical isolation where required.

Built to meet OEM specifications, this fastener is ideal for alternators, starters, and other electrical components requiring thread-forming capability and consistent hold strength.

⚙️ Key Features

• 🔩 OE-Style Fit & Function
  Designed to match original specifications for proper fit and performance.
• 🧲 Hex Washer Head (1/4" Drive)
  Easy installation with secure grip and torque control.
• 🔌 Integrated Insulator + Conical Washer
  Helps maintain electrical isolation and improves fastening stability.
• 🛠️ Thread-Forming Design
  Cuts its own threads for strong, reliable hold in compatible materials.
• 🎯 Dog Point Tip
  Ensures easy alignment and accurate installation.
• 💪 Durable Construction
  Built for long-term use in high-vibration and high-temperature environments.

📏 Specifications

• Part Number: 84-1239
• Condition: New
• Thread Size: 8-32
• Length: 1-5/16" (33.3mm)
• Head Type: Hex Washer Head
• Drive Size: 1/4"
• Design: Thread-Forming, Dog Point
• Washer Type: Attached Conical Washer
• Part Type: Screw / Bolt

🔁 Replaces Part Numbers

• 10474211
• 10491183
• 1988970

🚗 Compatible With (Reference Only)

This bolt is used across a wide range of applications. Compatible with multiple systems referencing part numbers from:

• Agricultural & Industrial Equipment
• Heavy-Duty Engines
• Electrical Components (Alternators / Starters)

Common reference systems include:
Agco, AM General, Case, Caterpillar, CNH, Cummins, Delco, and more.

✔️ Also cross-references hundreds of Lester numbers including:
7287 Series, 7640 Series, 7900 Series, 8000 Series, 8100 Series, and more.

(Use part number match to confirm fitment.)

📦 What’s Included

• 1x 84-1239 Screw Bolt (with insulator & washer attached)

⚠️ Fitment Notice

Please verify your original part number before purchasing.
Due to wide compatibility across many systems, this item is best matched using OEM or reference part numbers.

💡 Why Choose STS Parts?

• ✔ Reliable OE-style replacements
• ✔ Consistent quality control
• ✔ Designed for professional and DIY use
• ✔ Trusted in automotive & industrial applications