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In-stock parts
Order by 2PM MST
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Coupler only. The 1/4-inch key is sold separately.
The UnitedBuilt S30636MS hydraulic shaft coupler joins two male shafts: an SAE B 7/8-inch, 13-tooth splined shaft and a 1-1/8-inch round shaft with a 1/4-inch key. Use it when replacing a coupling in a hydraulic-drive water-pump assembly that requires this shaft-to-shaft connection.
Precision machined in the USA from 4140 steel to ASTM A108 and heat treated to 28–32 HRC, this is the individual shaft coupler, not a complete hydraulic drive or pump assembly. Match both shaft interfaces and the installation space before ordering.
| Specification | Details |
|---|---|
| Manufacturer part number | S30636MS |
| Component | Hydraulic shaft coupler |
| Spline connection | SAE B, 7/8-inch, 13-tooth female spline |
| Round-shaft connection | 1-1/8-inch female bore |
| Key size | 1/4 inch; key sold separately |
| Overall length | 2.875 ± 0.005 inches |
| Tapped set-screw hole | 3/8-16 |
| Material | 4140 steel to ASTM A108 |
| Heat-treated hardness | 28–32 HRC |
| Machining | Precision machined in the USA |
| Included item | One coupler |
Common applications include Berkeley B69876 pumps and B3ZRM(S) pumps converted to SAE B hydraulic drive using the B07779 adapter bracket. The pump must have the matching shaft connections and adapter arrangement shown below. The adapter bracket, hydraulic motor and pump are not included with this coupler.
| Pump application | Configuration to confirm |
|---|---|
| Berkeley B69876 | SAE B hydraulic drive with the B07779 adapter bracket and matching shaft connections. |
| Berkeley B3ZRMS: B68417 and B68416 | Converted to SAE B hydraulic drive with the B07779 adapter bracket and matching shaft connections. |
| Berkeley B3ZRM: B66895 and B66899 | Converted to SAE B hydraulic drive with the B07779 adapter bracket and matching shaft connections. |
| Check | What to confirm |
|---|---|
| Splined shaft | Match the SAE B 7/8-inch diameter and 13-tooth spline configuration. |
| Keyed shaft | Confirm a 1-1/8-inch round shaft and 1/4-inch key requirement. |
| Separate key | Order the key separately and verify the required length for your assembly. |
| Assembly fit | Check coupler length, shaft engagement, alignment and available space against your existing assembly. A pump model number alone does not confirm fit. |
| New hydraulic conversions | Follow the B07779 installation instructions and confirm any required pump-shaft preparation before fitting the coupler. |
| Operating requirements | Confirm the coupler is suitable for your drive's speed and torque requirements before installation. |
Need help selecting the correct shaft coupler? Contact UnitedBuilt through online chat, email parts@unitedbuilt.com, or call 602-253-7750 with your pump and motor models, shaft dimensions, or photos of the existing coupler.
| Material | 4140 Steel ASTM A108 |
|---|---|
| Country of Origin | USA (subject to change) |
| UPC | 850087050210 |
| Weight | 1.63 lb |
| Alternate part number |
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