S685ZZ Stainless Steel Fishing Reel Bearing, 5×11×5 mm

BLH S685ZZ is a miniature stainless steel deep groove ball bearing designed for compact rotating mechanisms, including suitable fishing reel assemblies. With SUS440C stainless steel rings and balls, P5 precision and Z4 noise grade, it is designed for applications where dimensional accuracy, smooth rotation and consistent bearing performance matter.

The bearing measures 5 mm in bore diameter, 11 mm in outside diameter and 5 mm in width. BLH also provides a 200-hour salt spray test specification for this product, subject to the applicable test method and acceptance criteria. For fishing tackle manufacturers, bearing distributors and replacement-parts suppliers, S685ZZ offers a defined specification for product evaluation and OEM sourcing.

S685ZZ Bearing Specifications

Item	Specification
Bearing model	S685ZZ
Bearing type	Single-row miniature deep groove ball bearing
Bore diameter	5 mm
Outside diameter	11 mm
Width	5 mm
Ring material	SUS440C stainless steel
Ball material	SUS440C stainless steel
Precision grade	P5
Noise grade	Z4
Shield type	Double metal shields (ZZ)
Salt spray testing	200 hours; test method and acceptance criteria to be confirmed against the test report
Application	Suitable fishing reel assemblies and other compatible miniature rotating mechanisms
Supply type	Standard bearing supply and OEM enquiries

Final dimensional tolerances, radial clearance, lubricant, operating speed and load ratings should be confirmed against the approved BLH drawing and technical data sheet for the ordered configuration.

Why Choose SUS440C Stainless Steel for Fishing Reel Bearings?

Fishing reels operate in environments where moisture, dirt and repeated exposure to outdoor conditions can affect bearing performance. For manufacturers and replacement-parts suppliers, material selection is an important part of controlling corrosion risk and maintaining consistent rotation.

SUS440C stainless steel is a hardened martensitic stainless steel commonly used in precision bearing components. It combines hardness with corrosion resistance, making it a suitable material option for miniature bearings used in demanding applications.

The S685ZZ uses SUS440C stainless steel rings and balls. Its 200-hour salt spray testing provides an additional reference for evaluating corrosion resistance under the specified test conditions.

Salt spray performance should be interpreted according to the actual test report, including the test standard, sample preparation and corrosion acceptance criteria. It does not mean the bearing is completely rustproof or guaranteed to withstand continuous seawater immersion.

For fishing reel manufacturers, the combination of stainless steel components, P5 precision and a defined noise grade can help establish measurable requirements during supplier qualification and incoming inspection.

P5 Precision and Z4 Noise Grade

Precision and noise are important considerations when selecting miniature bearings for compact rotating assemblies.

P5 precision

P5 is a precision classification associated with tighter dimensional and rotational accuracy requirements than standard bearing precision classes. For a fishing reel application, the final result also depends on shaft and housing tolerances, radial clearance, lubrication and assembly conditions.

A P5 bearing should therefore be evaluated as part of the complete rotating assembly rather than as a standalone guarantee of reel performance.

Z4 noise grade

Z4 is the noise grade specified for this S685ZZ product. Bearing noise classification and test results depend on the applicable inspection standard, testing equipment and operating conditions.

For OEM projects, BLH can use the agreed specification as a reference for product evaluation and batch acceptance. Buyers should confirm the applicable noise testing method and acceptance criteria when placing an order.

 

Is S685ZZ Suitable for Fishing Reel Applications?

The 5×11×5 mm S685ZZ is a candidate for fishing reel assemblies that require a miniature deep groove ball bearing with metal shields. Suitability depends on the original bearing dimensions, shaft and housing design, rotational speed, lubrication and operating environment.

Potential application areas include:

1. Fishing reel rotating assemblies

S685ZZ can be evaluated for compatible rotating components in spinning reels and baitcasting reels. Before use, confirm that the original bearing has the same 5×11×5 mm dimensions and compatible internal specifications.

2. Replacement fishing reel bearings

For fishing tackle repair shops, distributors and aftermarket suppliers, S685ZZ may be suitable as a replacement when the original bearing number, dimensions, shield design and operating requirements match.

3. Fishing tackle OEM production

Fishing reel manufacturers can specify S685ZZ for suitable assemblies where stainless steel construction, P5 precision and Z4 noise grade meet the design requirements. Prototype testing should be completed before approving the bearing for mass production.

The bearing should not be assumed to fit every fishing reel simply because its dimensions are common. Confirm the original bearing number and installation position before ordering.

Double Metal Shields for Controlled Bearing Protection

The ZZ configuration uses metal shields on both sides of the bearing. These shields help limit the entry of dust and larger particles while retaining lubricant inside the bearing.

For fishing reel applications, a shielded bearing can be a practical choice where low running resistance and protection against external contaminants are both important.

Metal shields are not equivalent to contact rubber seals and should not be treated as a waterproof barrier. For reels frequently exposed to splashing or saltwater, buyers should assess the complete sealing arrangement, corrosion requirements and maintenance procedure before selecting the bearing.

After fishing in saltwater, rinse the reel according to the reel manufacturer's maintenance instructions, dry it thoroughly and inspect the bearing area. Avoid directing high-pressure water into the bearing assembly.

What Buyers Should Check Before Replacing a Fishing Reel Bearing

Selecting a replacement bearing involves more than checking the model number.

Dimensions: Confirm the 5 mm bore, 11 mm outside diameter and 5 mm width against the original bearing.

Shield design: Check whether the original bearing uses double metal shields.

Material: Verify that SUS440C stainless steel is appropriate for the intended corrosion exposure.

Precision: Confirm whether P5 precision is required by the equipment design.

Noise requirements: Check whether Z4 matches the buyer's agreed inspection criteria.

Lubrication: Select lubricant according to operating speed, temperature, starting torque and maintenance requirements.

Installation: Apply force to the ring being fitted. Avoid transmitting mounting force through the rolling elements or striking the shields.

If the original bearing has unusual clearance, preload, lubrication or fit requirements, these details should be reviewed before approving a replacement.

BLH Manufacturing and OEM Supply

For bearing buyers, a reliable supply arrangement depends on clear specifications, consistent inspection and communication between the manufacturer and the purchasing team.

BLH can review S685ZZ enquiries according to the requested application, technical requirements and order quantity. For OEM projects, buyers should confirm the following information before production:

Required quantity and estimated annual demand

Approved material and dimensional specifications

P5 precision and Z4 noise acceptance requirements

Salt spray test standard and pass/fail criteria

Lubrication and packaging requirements

Sample availability, production lead time and inspection documentation

For qualification purposes, buyers may request the applicable material documentation, dimensional inspection results and salt spray test report, subject to availability and the agreed supply specification.

The purpose of this process is to ensure that the bearing delivered matches the requirements approved for the project, rather than relying on a model number alone.

Frequently Asked Questions

Q1: What are the dimensions of the S685ZZ bearing?

S685ZZ has a 5 mm bore, an 11 mm outside diameter and a 5 mm width. Confirm these dimensions against the original bearing and the approved product drawing before ordering.

Q2: What material is used in the BLH S685ZZ bearing?

The specified ring and ball material is SUS440C stainless steel. Other components, such as the cage and shields, should be confirmed against the approved configuration.

Q3: What does P5 precision mean?

P5 identifies a precision classification with tighter dimensional and rotational accuracy requirements than standard precision classes. Actual suitability depends on the bearing specification and the assembly design.

Q4: What does Z4 noise grade mean?

Z4 is the noise grade specified for this product. Buyers should confirm the relevant test standard, measurement conditions and acceptance criteria with BLH before placing an order.

Q5: Has the S685ZZ undergone 200-hour salt spray testing?

The specified requirement is 200 hours of salt spray testing. Buyers should request the relevant test report to confirm the test method, sample condition and acceptance criteria. The duration alone does not establish a universal corrosion-resistance rating.

Q6: Can S685ZZ be used in saltwater fishing reels?

It may be suitable for compatible reel assemblies, but suitability depends on actual saltwater exposure, sealing, lubrication and maintenance. SUS440C is corrosion-resistant, not completely corrosion-proof.

Q7: Can S685ZZ replace the original bearing in my fishing reel?

It can be considered when the original bearing matches the 5×11×5 mm dimensions and the required internal specifications. Send the original bearing number, dimensions or a clear photo for confirmation.

Q8: Can BLH provide S685ZZ bearings for OEM projects?

OEM enquiries can be reviewed based on the required specification, quantity, packaging and inspection requirements. Please confirm sample availability, minimum order quantity and lead time with BLH for your project.

Request a Quote for S685ZZ

Looking for a SUS440C stainless steel S685ZZ bearing for fishing reel production, replacement parts or OEM sourcing?

Contact BLH with your required quantity, application details and technical specifications. If you require P5 precision, Z4 noise grade and 200-hour salt spray testing, include these requirements in your enquiry so the applicable inspection documents and acceptance criteria can be confirmed before ordering.

 

Written by the BLH engineering team. Last updated: 2026-10-14.