ORFS & Code 61/62 Flange Fittings Also known in the market as: Caterpillar-type flange, OTFS
O-ring face seal (ORFS) connections and Code 61/62 metric flanges, pressure classes 3000 and 6000 psi, in straight, 90° and 45° versions — widely used on Caterpillar and other heavy machinery.
Overview
ORFS (O-ring face seal) fittings, which seal on a flat O-ring to ISO 8434-3, are used for high-pressure applications where a reliable leak-free joint is required; in some markets these are also referred to informally as "OTFS." In larger sizes and at very high pressures, a metric flange connection to SAE J518 (Code 61 for pressure class 3,000 psi and Code 62 for pressure class 6,000 psi) replaces the threaded joint; this flange family is widely known as a "Caterpillar-type" fitting because of its extensive use on Caterpillar and similar heavy machinery. Both fitting families are available in straight, 90° swept and 45° swept versions. Tose'e Tejarat Sayyalat supplies both connection types alongside the other standards.
End-User Industries
ORFS assembly torque table (ISO 8434-3)
| Size | Dash | Torque (Nm) |
|---|---|---|
| 9/16″ | -6 | 15 |
| 11/16″ | -9 | 20 |
| 13/16″ | -11 | 26 |
| 1″ | -13 | 31 |
| 1.3/16″ | -14 | 36 |
| 1.7/16″ | -15 | 41 |
| 1.11/16″ | -21 | 46 |
| 2.1/2″ | -32 | 51 |
ORFS Swivel Female hose-size table
Selecting the right ORFS fitting starts with the hose size it will be crimped onto, not just the thread size. The table below matches hose size, dash and standard thread:
| Part No. | Hose Dash | Hose Ø (inch) | Thread | Hex (mm) | Length C (mm) |
|---|---|---|---|---|---|
| X04LORF04 | -4 | 1/4″ | 9/16″-18 | 19 | 20 |
| X06LORF04 | -4 | 1/4″ | 11/16″-16 | 22 | 23 |
| X06LORF06 | -6 | 3/8″ | 11/16″-16 | 22 | 18 |
| X08LORF06 | -6 | 3/8″ | 13/16″-16 | 27 | 25 |
| X08LORF08 | -8 | 1/2″ | 13/16″-16 | 27 | 26 |
| X10LORF08 | -8 | 1/2″ | 1″-14 | 30 | 30 |
| X12LORF08 | -8 | 1/2″ | 1.3/16″-14 | 36 | 27 |
| X10LORF10 | -10 | 5/8″ | 1″-14 | 30 | 31 |
| X12LORF10 | -10 | 5/8″ | 1.3/16″-14 | 36 | 31 |
| X12LORF12 | -12 | 3/4″ | 1.3/16″-14 | 36 | 31 |
| X16LORF16 | -16 | 1″ | 1.7/16″-12 | 41 | 35 |
| X20LORF20 | -20 | 1.1/4″ | 1.11/16″-12 | 50 | 40 |
| X24LORF24 | -24 | 1.1/2″ | 2″-12 | 60 | 41 |
Metric flange torque table (SAE J518) — Code 61 / Code 62
| Size (DN) | Dash | Code 61 torque — 3,000 psi (N·m) | Code 62 torque — 6,000 psi (N·m) |
|---|---|---|---|
| 1/2″ | -8 | 17 | 17 |
| 3/4″ | -12 | 25 | 29 |
| 1″ | -16 | 31 | 46 |
| 1.1/4″ | -20 | 40 | 68 |
| 1.1/2″ | -24 | 52 | 125 |
| 2″ | -32 | 60 | 208 |
| 2.1/2″ | -40 | 85 | — |
Straight Code 61 flange dimension table (SAE 3000 psi) — flange diameter D
Column D is the outside diameter of the flange head (mm), which sets the O-ring and mounting-bolt fit against the hydraulic block or valve; without a correct D match the flange will not seat on the port.
| Hose Dash | Hose Ø | Flange Size | D — Flange Ø (mm) | C — Length (mm) |
|---|---|---|---|---|
| -8 | 1/2″ | 1/2″ | 30.2 | 46 |
| -8 | 1/2″ | 3/4″ | 38.1 | 47 |
| -12 | 3/4″ | 3/4″ | 38.1 | 48 |
| -12 | 3/4″ | 1″ | 44.5 | 51 |
| -16 | 1″ | 1″ | 44.5 | 52 |
| -16 | 1″ | 1.1/4″ | 50.8 | 57 |
| -20 | 1.1/4″ | 1.1/4″ | 50.8 | 58 |
| -20 | 1.1/4″ | 1.1/2″ | 60.3 | 68 |
| -24 | 1.1/2″ | 1.1/2″ | 60.3 | 68 |
| -24 | 1.1/2″ | 2″ | 71.4 | 71 |
| -32 | 2″ | 2″ | 71.4 | 71 |
Straight Code 62 flange dimension table (SAE 6000 psi) — flange diameter D
| Hose Dash | Hose Ø | Flange Size | D — Flange Ø (mm) | C — Length (mm) |
|---|---|---|---|---|
| -12 | 3/4″ | 3/4″ | 41.3 | 54 |
| -12 | 3/4″ | 1″ | 47.6 | 60 |
| -16 | 1″ | 1″ | 47.6 | 61 |
| -16 | 1″ | 1.1/4″ | 54.0 | 68 |
| -20 | 1.1/4″ | 1.1/4″ | 54.0 | 70 |
| -20 | 1.1/4″ | 1.1/2″ | 63.5 | 76 |
| -24 | 1.1/2″ | 1.1/2″ | 63.5 | 76 |
| -24 | 1.1/2″ | 2″ | 79.4 | 85 |
| -32 | 2″ | 2″ | 79.4 | 85 |
Use on heavy machinery (Caterpillar and similar)
Code 61/62 flange fittings are widely used on the hydraulic systems of construction and mining machinery — including Caterpillar excavators and loaders — for their high strength and reliable sealing at high pressure, which is why they are commonly known in the market as "Caterpillar-type" fittings. The photos below show a real example of this fitting on the hydraulic lines of heavy industrial equipment:
Technical Catalogue
The full hose-to-ferrule selection table, together with crimp and skive data for this connection type, is available on request from our sales department.
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