The Multiquip 503111 is a genuine OEM Screw HHC 1/2-13 x 4-1/2 designed for a broad range of Multiquip equipment including concrete pumps, walk-behind vibratory rollers, and trash pumps. This hex head cap screw is a direct OEM replacement sourced from Multiquip, ensuring correct thread specification, head dimensions, and shank length for a proper installation every time. Confirmed fitment includes the C30HDGA, LS600P, LS60TD, V304EH, V304EY, V304ER, V305EK, V305EH, MQ600TD80-TLRP, and MQ600TD80-TLRB. Keeping the correct fastener on hand prevents assembly delays and ensures structural connections are held to the correct torque and load specifications.
Key Features
- Genuine OEM Thread Specification — Manufactured to the exact 1/2-13 UNC thread pitch and 4-1/2 inch length called out in Multiquip service documentation, so the fastener engages correctly without cross-threading or fitment issues.
- Hex Head Cap Screw Design — Standard hex head format seats flush and accepts common drive tools for consistent torque application across concrete pump, roller, and trash pump assemblies.
- Broad Equipment Compatibility — Fits concrete pump models C30HDGA, LS600P, and LS60TD; walk-behind rollers V304EH, V304EY, V304ER, V305EK, and V305EH; and trash pumps MQ600TD80-TLRP and MQ600TD80-TLRB.
- Structural Integrity Across Applications — As a load-bearing fastener used across multiple machine types, using the correct grade and length maintains the clamping force required for safe, stable operation of the assembled components.
- OEM Sourced Replacement — Supplied as a genuine Multiquip part, matching the original material grade and dimensional tolerances specified for these machines at the time of manufacture.
A hex head cap screw like the 503111 serves as a structural fastener that clamps and secures major components together within the machine assembly. The 1/2-13 thread designation refers to the nominal diameter and thread count per inch, while the 4-1/2 inch length determines how deeply the fastener engages through the mating parts. Using the wrong length or thread pitch in this position risks inadequate clamping, stripped threads, or component misalignment — all of which can lead to premature mechanical failure or unsafe operating conditions.
Part Details
| Part Number | 503111 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Screw HHC 1/2-13 x 4-1/2 |
Compatibility & Fitment
| Name | Model |
|---|---|
| Mayco Pumps | C30HDGA |
| Rollers | V305EK |
| Rollers | V305EH |
| Mayco Pumps | LS600P |
| Mayco Pumps | LS60TD |
| Trash Pumps | MQ600TD80-TLRP |
| Trash Pumps | MQ600TD80-TLRB |
| Rollers | V304EY |
| Rollers | V304ER |
| Rollers | V304EH |
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.
