Attributes

Brand	-
Category	New Fashion Jewelry / Chains
Origin	-
Material	PTFE Composite with Bronze Backing
Inner Diameter	24 mm
Outer Diameter	27 mm
Length	30 mm
Lubrication Type	Self-Lubricating (Oil-Impregnated)
Max Load Capacity	140 N/mm² Static
Operating Temperature	-40°C to +110°C
Friction Coefficient	0.03 - 0.15 (Dynamic)
Application	Chain Guides, Pivot Points, Linkage Systems
Finish	Smooth PTFE Running Surface

6 reviews

Anonymous

Mar 29, 2026

Rating: 5/5

Standard industrial grade quality

Exactly what was described. The PTFE layer is consistent, and the bronze backing provides good structural integrity. No issues during installation or operation so far.

Anonymous

Mar 22, 2026

Rating: 4/5

Good quality, slightly tight tolerance

The material quality seems excellent and very durable. The inner diameter was just a hair tight for our 24mm shaft, requiring some light reaming, but once installed, performance is great.

Anonymous

Mar 12, 2026

Rating: 5/5

Reliable and cost-effective

Bought a batch for maintenance stock. They meet all the specified dimensions perfectly. Great value for money compared to buying individual units from local suppliers.

Anonymous

Mar 07, 2026

Rating: 4/5

Works well in wet conditions

Using these in a washdown area where our chain drives operate. They handle the moisture well without rusting or seizing up. Would give 5 stars if shipping was faster.

Anonymous

Mar 05, 2026

Rating: 5/5

Perfect fit for our conveyor chain guide

These bearings slid right into the housing with minimal press fit required. We use them in a dusty environment for our chain drive system, and they have been running smoothly for three months without any additional lubrication.

Anonymous

Mar 01, 2026

Rating: 5/5

Excellent for high-cycle applications

We replaced standard bronze bushings with these SF1 composites in our packaging machine chains. The noise reduction is significant, and we no longer have to stop production for greasing.

5 FAQ

Q: What is the recommended shaft tolerance for a 24mm ID?

A: For optimal performance, we recommend a shaft tolerance of e7 or f7 to ensure proper clearance for the self-lubricating layer to function correctly.

Q: Is the 30mm length exact or is there a tolerance?

A: There is a standard manufacturing tolerance of ±0.1mm on the length. If you require tighter tolerances, please contact us for custom machining options.

Q: Do I need to grease these before installation?

A: No, these are self-lubricating bearings. Adding external grease can actually attract dust and debris, potentially reducing their lifespan in dirty environments.

Q: Can these bearings be used in submerged water applications?

A: While they are water-resistant and suitable for wet environments, continuous submersion is not recommended as it may affect the long-term retention of the impregnated lubricant.

Q: Are these compatible with stainless steel shafts?

A: Yes, SF1 composite bearings work excellently with stainless steel shafts, providing low friction and preventing galling even under oscillating motion.

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