The Multiquip EM129 Hex Bolt 3/4-10x8 1/2 is a genuine OEM fastener designed for the C30HD, C30HDNI, C30HDNI Precision, C30HDNI Zenith, C30HDN, C30HDG, C30HDZ, and C30HDGA concrete pump models. As a direct-source OEM component, this bolt meets the exact dimensional and material specifications required by Multiquip for these cycloidal-drive concrete pumps. Sourcing the correct fastener is critical on high-stress concrete pump assemblies, and EM129 ensures the fit and thread engagement match what the machine was built with.
Key Features
- Genuine OEM Grade Hardware — Manufactured to Multiquip's material and dimensional specifications, ensuring correct thread pitch (3/4-10) and full 8 1/2-inch shank length for proper clamping load in structural pump assemblies.
- Exact Thread and Length Match — The 3/4-10 coarse thread profile and 8 1/2-inch length are specific to fastener positions on C30-series concrete pumps — installs directly without modification to threads or hardware.
- Broad C30-Series Compatibility — Fits C30HD, C30HDNI, C30HDNI Precision, C30HDNI Zenith, C30HDN, C30HDG, C30HDZ, and C30HDGA cycloidal concrete pump models.
- Structural Integrity Under Pump Loads — Concrete pumps generate significant cyclic hydraulic and mechanical forces; a correctly sized and torqued bolt maintains joint integrity and prevents costly loosening or failure at critical connection points.
- Verified OEM Part Number — Ordering by Multiquip part number EM129 confirms you receive the correct bolt for your machine, eliminating the risk of substituting an incorrect-length or incorrect-grade fastener.
A hex bolt of this size and thread specification serves as a primary structural fastener in heavy-duty assembly joints on cycloidal concrete pumps. At 3/4-10 coarse thread and 8 1/2 inches in length, it is designed to develop high clamping force across thick flanges, housings, or frame components where a shorter or finer-thread bolt would not provide adequate engagement. When a structural bolt like this stretches, strips, or is replaced with an incorrect specification, joint movement can develop under the vibration and pressure cycles of concrete pumping operation, accelerating wear on surrounding components and creating the potential for assembly failure. Using the correct OEM replacement ensures the joint performs as the machine was engineered to operate.
Part Details
| Part Number | EM129 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Hex Bolt 3/4-10x8 1/2 |
Compatibility & Fitment
| Name | Model |
|---|---|
| Mayco Pumps | C30HD |
| Mayco Pumps | C30HDNI |
| Mayco Pumps | C30HDNI Precision |
| Mayco Pumps | C30HDN |
| Mayco Pumps | C30HDNI Zenith |
| Mayco Pumps | C30HDG |
| Mayco Pumps | C30HDZ |
| Mayco Pumps | C30HDGA |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
