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Bore 0.2500 / 1/4-28 ThreadPFR4 / PFL4 verfügt über eine 0.2500″-Bohrung (B) und einen 0.750″-Gehäusedurchmesser (D), mit einer 0.500″ präzisionsgeschliffenen 52100-Stahlkugel, die in einer spritzgegossenen Nylon-Laufbahn läuft. Die Gesamtkörperlänge (AF) beträgt 1.312″, der Gewindeeingriff (CF) misst 0.750″. Die Breite (W) beträgt 0.375″ und die Körperdicke (T) 0.281″. Ungefähres Gewicht: 0.060 lbs.
Mit einer statischen Radiallast von 2,500 lb und einem Fehlausrichtungswinkel von ±16° eignet sich dieser Gelenkkopf mit Innengewinde 1/4-28 UNF 3A für leichtlastige Gestänge, Steuerungssysteme und Präzisionsinstrumente. Die spritzgegossene Nylon-Laufbahn ist von Konstruktion wegen selbstschmierend — keine Schmiernippel oder Wartungspläne erforderlich, was diesen Gelenkkopf ideal für abgeschlossene oder schwer zugängliche Installationen macht.
Erhältlich in Ausführungen mit Rechtsgewinde (PFR4) und Linksgewinde (PFL4). Bolzenausführung erhältlich (Suffix S hinzufügen, z. B. PFR4-S). Silberfarbene Verzinkung auf Anfrage für erweiterten Korrosionsschutz erhältlich. Das Gehäuse besteht aus Kohlenstoffstahl, wärmebehandelt und gelb verzinkt; die Kugel besteht aus 52100 Wälzlagerstahl, hartverchromt.
All available sizes in the PM PF Gelenkköpfe aus Kohlenstoffstahl mit gegossener Laufbahn series. Can’t find your size? Contact us for custom dimensions.
| RIGHT HAND PART NO. | LEFT HAND PART NO. | B DIA. +.0025 -.0005 | D DIA. +.010 -.010 | W WIDTH +.005 -.005 | T WIDTH +.005 -.005 | BALL DIA. REF. | AM LENGTH +.015 -.015 | N THREAD UNF 3A | CM LENGTH +.062 -.031 | a° MIS. ANGLE REF. | STATIC RADIAL LOAD (LBS) | APPROX WEIGHT (LBS) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PMR3 | PML3 | 0.1900 | 0.625 | 0.312 | 0.250 | 0.437 | 1.250 | 10-32 | 0.750 | 13 | 1,174 | 0.03 |
| PMR4 | PML4 | 0.2500 | 0.750 | 0.375 | 0.281 | 0.500 | 1.562 | 1/4-28 | 1.000 | 16 | 2,168 | 0.04 |
| PMR5 | PML5 | 0.3125 | 0.875 | 0.437 | 0.344 | 0.625 | 1.875 | 5/16-24 | 1.250 | 14 | 2,796 | 0.07 |
| PMR6 | PML6 | 0.3750 | 1.000 | 0.500 | 0.406 | 0.719 | 1.938 | 3/8-24 | 1.250 | 12 | 4,012 | 0.11 |
| PMR7 | PML7 | 0.4375 | 1.125 | 0.562 | 0.437 | 0.812 | 2.125 | 7/16-20 | 1.375 | 14 | 4,244 | 0.16 |
| PMR8 | PML8 | 0.5000 | 1.312 | 0.625 | 0.500 | 0.937 | 2.438 | 1/2-20 | 1.500 | 12 | 6,453 | 0.25 |
| PMR10 | PML10 | 0.6250 | 1.500 | 0.750 | 0.562 | 1.125 | 2.625 | 5/8-18 | 1.625 | 16 | 7,400 | 0.38 |
| PMR12 | PML12 | 0.7500 | 1.750 | 0.875 | 0.687 | 1.312 | 2.875 | 3/4-16 | 1.750 | 14 | 10,937 | 0.60 |
| RIGHT HAND PART NO. | LEFT HAND PART NO. | B | D | W | T | BALL | AF | N | CF | a° | STATIC | LBS |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PFR3 | PFL3 | 0.1900 | 0.625 | 0.312 | 0.250 | 0.437 | 1.062 | 10-32 | 0.562 | 13 | 1,220 | 0.04 |
| PFR4 | PFL4 | 0.2500 | 0.750 | 0.375 | 0.281 | 0.500 | 1.312 | 1/4-28 | 0.750 | 16 | 2,500 | 0.06 |
| PFR5 | PFL5 | 0.3125 | 0.875 | 0.437 | 0.344 | 0.625 | 1.375 | 5/16-24 | 0.750 | 14 | 2,753 | 0.09 |
| PFR6 | PFL6 | 0.3750 | 1.000 | 0.500 | 0.406 | 0.719 | 1.625 | 3/8-24 | 0.937 | 12 | 3,950 | 0.15 |
| PFR7 | PFL7 | 0.4375 | 1.125 | 0.562 | 0.437 | 0.812 | 1.812 | 7/16-20 | 1.062 | 14 | 4,300 | 0.2 |
| PFR8 | PFL8 | 0.5000 | 1.312 | 0.625 | 0.500 | 0.937 | 2.125 | 1/2-20 | 1.187 | 12 | 6,453 | 0.33 |
| PFR10 | PFL10 | 0.6250 | 1.500 | 0.750 | 0.562 | 1.125 | 2.500 | 5/8-18 | 1.500 | 16 | 7,400 | 0.48 |
| PFR12 | PFL12 | 0.7500 | 1.750 | 0.875 | 0.687 | 1.312 | 2.875 | 3/4-16 | 1.750 | 14 | 10,937 | 0.72 |
Material certifications verified. Composition confirmed by spectrometer before machining begins.
100% go/no-go gauge check on all threaded sections. Zero tolerance on dimensional non-conformance.
Static and dynamic load tests run on representative samples from each production batch.
CMM verification of critical dimensions — ball diameter, bore, thread pitch, and body length.
Visual and tactile inspection for burrs, scratches, surface cracks, and plating defects.
Misalignment angle and torque measured to confirm liner performance meets specification.
Hardness tests confirm proper heat treatment on chromoly steel bodies and bearing balls.
Full traceability from raw material heat number to finished part. COC and inspection reports available.
Share your part number, required quantity, and any special material or packaging requirements. We respond within 24 hours.
The PFR4 / PFL4 is a female rod end with a 0.2500 in. bore and 1/4-28 thread, running a precision-ground 52100 steel ball in a self-lubricating injection-molded nylon race. It suits light-duty linkages, control systems, and precision instrumentation.
The PFR4 / PFL4 is rated at 2,500 lb static radial load with ±16° of misalignment.
Overall body length is 1.312 in., thread engagement is 0.750 in., width (W) is 0.375 in., body thickness (T) is 0.281 in., approximate weight is 0.060 lbs.
The ball is 52100 bearing steel, precision ground, heat treated, hard chrome plated. The body is carbon steel, yellow zinc plated, and the race is injection molded nylon — self-lubricating by design, with no grease fittings or maintenance schedule required.
PFR4 is the right-hand thread version and PFL4 is the left-hand thread version of this same female rod end. A stud configuration is also available by adding suffix S (e.g. PFR4-S), and silver zinc plating is available on request for extra corrosion protection.
Yes — SYZ has a technical drawing on file for this part (drawing reference 72451); request it when you send your inquiry.
