| Product Line | Driveline & Axles, Driveline & Axles |
| Category Name | Wheel Studs, Inner Cap Nuts and Nuts for Wheels, Wheel Studs, Inner Cap Nuts and Nuts for Wheels |
| Part Type | Inner Cap Nut, Inner Cap Nut |
| Alternate Part Name | Inner Cap Wheel Lug Nut, Inner Cap Wheel Lug Nut |
| OEM Part Number | E-5988-R, E-5988-R |
| Application Type | Semi-Trucks, Heavy-Duty Trucks, Semi-Trucks, Heavy-Duty Trucks |
| Material | Hardened steel with zinc dichromate coating., Hardened steel with zinc dichromate coating. |
| Hex Size | 13/16 in., 13/16 in. |
| Inner Thread | 3/4 in. -16, 3/4 in. -16 |
| Inner Thread Min. Depth | 1-15/16 in., 1-15/16 in. |
| Outer Overall Length | 3-3/32 in., 3-3/32 in. |
| Outer Thread | 1-1/8 in. -16, 1-1/8 in. -16 |
| Thread Direction | RH (Right Hand), RH (Right Hand) |
| Net Weight | 0.52 lb., 0.52 lb. |
| Cross References | 133020R, 133026R, 133026RP, 1332004R, 2011007R, 21W486487, 36105988, 385988R, 511003R, 511009R, 611079, 611080, 6412354, 70611, 916112, 988R, E-5988-R, E5988R, M136, M2400, MWCX02138, R005988R, X1873, 13-3026R, 51-1003R, M-2400, WE5988R |
| Intended Application | - Dual Mounted Aluminum Wheels. OE Standard with full inner threads applications requiring maximum thread engagement.
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