JIC (UNF) Bulkhead Fittings
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JIC BULKHEAD FITTING
JIC (UNF) bulkhead fittings are specialized connection components used in hydraulic power systems to safely and tightly route pressure lines through walls, bulkheads, mounting plates, and machine housings. They are equipped with an elongated body with an external thread and a strong bulkhead locknut, which allows for their rigid and stable seating in the mounting hole. The use of the American JIC (Joint Industry Council) standard with a characteristic 74° sealing cone and UNF inch thread guarantees high resistance to dynamic loads, vibrations, and extreme pressure surges. These fittings are widely used in construction, agricultural, and forestry machinery, industrial vehicles, and in equipment from American brands (including Caterpillar, John Deere, Case, Bobcat).
Application and Technical Characteristics of JIC UNF Bulkhead Fittings
Bulkhead components in the JIC 74° standard have been designed with durability and versatility in mind. They enable a stable connection of flexible hydraulic hoses or rigid pipes on both sides of the bulkhead without the risk of the hoses rubbing against the edges of the hole.
- 74° Tapered Seal: Connection tightness is achieved through a precise metal-to-metal seat on a 74° cone, which eliminates the need for additional soft seals.
- American UNF/UN Inch Threads: Compliance with SAE J514 and ISO 8434-2 standards ensures full compatibility with American and European hydraulic systems.
- Stable Bulkhead Nut: A steel locknut included in the set presses the fitting body against the housing wall, preventing the lines from moving and loosening under the influence of vibrations.
- High Pressure Resistance: Forged zinc-plated free-cutting steel guarantees safe operation in a pressure range from 210 bar to 450 bar, depending on the thread size.
- Durable Corrosion Protection: Zinc coating with passivation protects the components from moisture, workshop chemicals, and harsh weather conditions.
Why Choose JIC Bulkhead Fittings at the HYDRON Store?
JIC UNF bulkhead fittings available at the HYDRON store are produced according to strict industrial guidelines of ISO 8434-2 and SAE J514 standards. Accurate thread pitch and perfectly ground 74° cone surfaces exclude the risk of micro-leaks and ensure easy installation in tight workspaces. The use of bulkhead fittings facilitates the modular assembly of components and increases the aesthetics and safety of the entire hydraulic installation. For comprehensive machine equipment, we offer flexible hydraulic hoses, matching hose fittings, self-sealing test points and workshop measurement kits.
Technical Specification
| Technical Parameter | Value / Description |
|---|---|
| Product Category | JIC UNF Bulkhead Fittings (straight, 90° elbow) |
| Sealing Standard | 74° Cone (metal-to-metal seat) |
| Thread Types | American Inch UN / UNF (7/16", 1/2", 9/16", 3/4", 7/8", 1.1/16", 1.5/16", 1.5/8") |
| Body Materials | Galvanized free-cutting steel 11SMnPb37 / AISI 316L Stainless steel (upon request) |
| Working Pressure Range | from 210 bar to 450 bar (depending on size) |
| Standard Compliance | SAE J514, ISO 8434-2 |
| Included in Set | JIC bulkhead fitting body + steel bulkhead nut |
| Operating Temperature Range | from -40°C to +120°C (for galvanized steel) |
Frequently Asked Questions (FAQ)
What is a JIC UNF bulkhead fitting used for?
A JIC UNF bulkhead fitting is used for safely routing hydraulic lines through a wall, bulkhead, or machine frame. The long threaded part along with the bulkhead nut allows for stiffening the connection in the mounting panel.
How is the connection sealed in JIC fittings?
The JIC connection is sealed mechanically by pressing the 74° external cone against the 74° internal cone of the nut end. This is a metal-to-metal type seal that does not require additional O-rings or washers.
Is a special nut needed for the installation of a JIC bulkhead fitting?
Yes, a dedicated bulkhead nut (locknut) is included with the bulkhead fitting, which is used to tighten and lock the fitting body on the mounting wall.
In which machines are JIC UNF threads used?
JIC UNF threads are commonly used in American-made machines, as well as in modern construction and agricultural equipment from brands such as Caterpillar, John Deere, Bobcat, Case, New Holland, or JCB.