Product Overview
The 4ON SAE socket head plug is a compact hydraulic sealing component designed to close and seal unused threaded ports in hydraulic manifolds, valves, cylinders, and other fluid power systems. Featuring an SAE straight male thread combined with an elastomer O-ring seal, it provides dependable leak-free sealing for high-pressure hydraulic applications.
Its recessed hex socket design allows fast and convenient installation using standard hex tools, making it especially suitable for confined installation spaces where external wrench access is limited. The compact profile also helps reduce protrusion, improving system layout and equipment safety.
Manufactured in accordance with ISO 8434-2, ISO 11926-2, and SAE J514 standards, the 4ON plug ensures excellent dimensional accuracy and broad compatibility with SAE hydraulic ports.
Structural Advantages
Unlike conventional hex-head plugs, the 4ON socket head plug uses an internal hex drive that enables easier installation in tight spaces and improves protection against accidental external impact. This design is widely preferred in hydraulic manifolds and compact power units where installation clearance is limited.
The integrated O-ring sealing system creates face sealing rather than relying solely on thread interference, significantly improving sealing reliability under pressure fluctuations and thermal cycling. This design reduces leakage risk while minimizing thread wear during repeated assembly and disassembly.
With pressure resistance up to 420 bar (6000 PSI), the 4ON plug delivers stable sealing performance in demanding hydraulic operating conditions.
Technical Specifications
Product Type: SAE Socket Head Hydraulic Plug
Connection Type: SAE Straight Thread
Standards: ISO 8434-2 / ISO 11926-2 / SAE J514
Sealing Type: O-Ring Seal
Material: Carbon Steel
Surface Treatment: Zinc Plated / Zn-Ni Optional
Maximum Working Pressure: 420 bar (6000 PSI)
Thread Range: 1/4" – 2"
Applicable Media: Hydraulic Oil, Lubricants, Industrial Fluids
(Original dimension table can be placed here.)
Description
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PART NO. | THREAD | O-RING | DIMENSIONS |
E | E terminal | A | L | S1 |
4ON-04 | 7/16"X20 | 8.92X1.83 | 9.1 | 11.5 | 5 |
4ON-05 | 1/2"X20 | 10.52xX1.83 | 9.1 | 11.5 | 5 |
4ON 06 | 9/16"X18 | 11.89x1.98 | 9.9 | 12.2 | 6 |
4ON-08 | 3/4"X16 | 16.36X2.21 | 11.1 | 14.3 | 8 |
4ON-10 | 7/8"X14 | 19.18x2.46 | 12.7 | 16 | 10 |
4ON-12 | 1.1/16"X12 | 23.47x2.95 | 15.1 | 19 | 14 |
4ON-16 | 1.5/16"X12 | 29.74X2.95 | 15.1 | 19 | 16 |
4ON-20 | 1.5/8"X12 | 37.46x3.00 | 15.1 | 19 | 19 |
Applications
The 4ON SAE socket head plug is widely used in hydraulic manifolds, pumps, valve blocks, cylinders, mobile hydraulic equipment, and industrial fluid power systems. It is ideal for sealing unused service ports, maintenance access points, and auxiliary hydraulic connections where compact installation and reliable sealing are essential.
