Coupling Selection
A Gates hydraulic hose coupling usually consists of two primary components:
1. a FERRULE placed over the end of a hose.
2. a STEM inserted into the end of a hose.
Ferrule Selection
Ferrule type designations (PC, PCS, PCM, C4, etc.) correspond to the stem hose end type designations (16PCS-16MP, etc.).
Always consult Gates Crimp Data Charts for correct ferrule recommendations. For example, C12M hose can be coupled with either PCS1F or PCS2F ferrules and PCS stems. PCS1F ferrules require no skiving. You simply crimp the coupling to the hose.
The number "2" before the "F" in ferrule designations means that two steps are needed for correct hose coupling:
1. Skiving to remove the cover from the hose end
2. Crimping phase
Always install the correct ferrule for a specific hose and stem combination. For instance, there is an important design difference between an 8PC2F-2 ferrule and an 8PC2F-2C ferrule which is vital to the compatibility and performance of the hose assembly.
Always refer to Gates Crimp Data Charts for the right hose, stem and ferrule combination. Example of ferrule description:
| 6PC1FS | ||||
| 6 | PC | 1 | F | S |
| Dash Size | Stem Type | No Skive (2=Skive) | Ferrule | Material (S=Steele) (A=Aluminum) |
Stem Selection
Different hoses may require different coupling styles. To make your selection, determine the correct stem to be used. There are two functional ends of the stem to consider:
1. the hose end for hose attachment.
2. the thread end for port attachment.
References to the coupling type(s) recommended for a specific hose are listed on the individual hose data pages; for example, C13 (G5K) hose specifies Global Spiral™ and PCM couplings.
The thread end of a coupling (or adapter) can be identified by comparing with the coupling being replaced or by measuring the port or thread end to which it is to be attached.
See the thread end identification nomenclature listed in Tables 1 and 2.
| Table 1. Coupling and Adapter End Style Code | ||||
| Code | Description | Code | Description | |
| AB | Air Brake | JIS | Japanese Industrial Standard | |
| B | O-Ring Boss | K | Komatsu Style (Japanese 30° Seat) | |
| BJ | Banjo | LH | Long Hex | |
| BKHD | Bulkhead | LN | Long Nose | |
| BS | Bite Sleeve | M | Male | |
| BSPP | British Standard Parallel Pipe | MFA | Male Flareless Assembly (Ermeto) | |
| C | Caterpillar Flange Dimension | MKB | Metric Kobelco | |
| CC | Clamping Collar | MM | Metric Male | |
| DH | DIN Heavy | MN | Metric Nut | |
| DL | DIN Light | MPG | Male Special Grease Fitting | |
| F | Female | MSP | Metric Stand Pipe | |
| FBO | Female Braze-on Stem | OR | O-Ring | |
| FF | Flat Face | P | Pipe Thread (NPTF or NPSM) | |
| FFN | Female Flareless Nut | PL | Press Lok® | |
| FOR | Flat-Face O-Ring | PWX | Pressure Washer Swivel | |
| FFS | Female Flareless Sleeve | R | Reusable | |
| FG | Female Grease Thread | S | SAE (45° Flare) | |
| FKX | Female Komatsu Style Swivel | TS | Tube Sleeve | |
| FL | Code 61 O-Ring Flange | TSN | Tube Sleeve Nut | |
| FLC | Caterpillar Style O-Ring Flange (Code 62) | X | Swivel | |
| FLH | Code 62 O-Ring Flange Heavy | Z | Parker Triple Thread | |
| FT | Female SAE Tube | 22 | 22 ½° | |
| FLOS | Flange O-Ring Special (Code 62) | 30 | 30° | |
| HLE | Hose Length Extender | 45 | 45° | |
| HLEC | Hose Length Extender (Caterpillar) | 60 | 60° | |
| HM | Hose Mender | 67 | 67 ½° | |
| I | Inverted Flare | 90 | 90° | |
| J | JIC (37 Flare) | 110 | 110° | |
Table 2. System Stecko Adapter and Press Lok® Coupling End Style Code | ||||
Code | Description | Code | Description | |
B | O-Ring Boss or Backup | M | Male or Medium | |
BB | Banjo Bolt | O | "O" as in O Ring | |
BJ | Banjo | P | Pipe Thread | |
BV | Ball Valve | R | Ring | |
BW | Banjo Washer | S | Short | |
C | Cross | T | Tee | |
F | Female | X | Swivel | |
K | Double Y | Y | Y | |
L | Long | |||
Coupling Dash Size and End Style
Coupling Dash Size is a shorthand method of denoting the size of a particular end fitting.
See Table 3.
Example: 12MP denotes a 3/4" male pipe end fitting. The corresponding thread description for a 3/4" pipe thread is 3/4-14 NPTF solid male.
Example: 12FJX denotes a 3/4" female JIC swivel (37 seat) end fitting. The corresponding thread description for a 3/4" JIC thread is 1 1/16-12 JIC 37 flare swivel female.
Example: 12FL denotes a 3/4" SAE standard pressure (Code 61) flange fitting. This is the standard fitting description for a 3/4" SAE standard pressure flange.
Thread End Catalog Descriptions
Gates coupling ends shown are industry standards. See detailed catalog listings for availability of specific hose/coupling combinations, detailed descriptions, thread end configurations such as swivels and bent tubes and special ends.
| Table 3 Thread Size Dash Numbers | |||
| Dash Size | Thread Sizes | ||
| NPTF-NPSM | SAE (45 Flare) | JIC (37 Flare) SAE O Ring Boss | |
| 2 | 1/8 - 27 | - | - |
| 3 | - | - | 3/8 - 24 |
| 4 | 1/4 - 18 | 7/16 - 20 | 7/16 - 20 |
| 5 | - | 1/2 - 20 | 1/2 - 20 |
| 6 | 3/8 - 18 | 5/8 - 18 | 9/16 - 18 |
| 8 | 1/2-14 | 3/4 - 16 | 3/4 - 16 |
| 10 | - | 7/8 - 14 | 7/8 - 14 |
| 12 | 3/4 - 14 | 1 1/16 - 14 | 1 1/16 - 12 |
| 14 | - | - | 1 3/16 - 12 |
| 16 | 1 - 11 1/2 | - | 1 5/16 - 12 |
| 20 | 1 1/4 - 11 1/2 | - | 1 5/8 - 12 |
| 24 | 1 1/2 - 11 1/2 | - | 1 7/8 - 12 |
| 32 | 2 - 11 1/2 | - | 2 1/2- 12 |
"O" Ring Flange dash numbers are determined by nominal flange size, or diameter of flange head which determines the "O" Ring size.