25.5x41.5x8.5 mm Power Steering Oil Seal NBR, Metal-Cased Rotary Shaft Seal

Product Overview

A 25.5 x 41.5 x 8.5 mm power steering oil seal sits on the shaft of a hydraulic steering pump or rack. It holds power steering fluid inside the unit and keeps dust and water away from the shaft. The 8.5 mm body is thin because steering housings leave very little depth around the shaft.

At a glance:

25.5x41.5x8.5 mm | NBR (nitrile butadiene rubber) | single lip with a garter spring, metal-cased body with a rubber-covered outer diameter | made in Xingtai, Hebei, China | working range -30 C to +100 C (short peaks to +120 C)

VKEFOT moulds this size in Xingtai, Hebei, China for steering and hydraulic repair shops, wholesalers and MRO buyers who order by dimension. Confirm the shaft, the housing bore and the depth against your own unit before ordering, because steering families share housings but not always shaft sizes.

Key Features & Benefits

• Holds hydraulic fluid: The lip compound is chosen for power steering fluid and mineral hydraulic oil and keeps sealing when the pump is at working temperature and pressure.
• Thin 8.5 mm body: A shallow steering housing has no room for a wide seal, so this depth keeps the body flush with the housing face.
• Metal case for a square seat: The steel case holds its diameter through the press fit, which suits the small, easily marked bores used in steering pumps and racks.
• Spring-loaded lip: A garter spring maintains lip contact on the shaft, so pressure cycling and shaft wear do not relax the seal over time.
• Copes with pressure and heat: A steering unit runs hot and under pressure, and a spring-loaded lip holds that duty better than a plain compression seal.
• Matched by measurement: The fit is set by shaft, bore and available depth, so measure the unit rather than relying on a model name.

Dimensions & Specification

Specification	Value
Inner Diameter (ID)	25.5 mm
Outer Diameter (OD)	41.5 mm
Width / Height	8.5 mm
Material	NBR (nitrile butadiene rubber)
Colour	Black
Structure	Single lip, garter spring, metal-cased body with a rubber-covered outer diameter
Seal Type	Power steering oil seal
Marking	VKEFOT
Continuous Service Temperature	-30 C to +100 C (short peaks to +120 C)
Brand	VKEFOT
Origin	Xingtai, Hebei, China

Dimensions are nominal production values, given as inner diameter x outer diameter x width. Check them against your own sample, or against a measured shaft and housing bore, before releasing an order.

Material & Construction

The lip is moulded from NBR (nitrile butadiene rubber), the usual choice for power steering fluid and mineral hydraulic oil. It covers -30 C to +100 C (short peaks to +120 C) and keeps enough elasticity to follow a shaft that is slightly out of round. The lip is supported by a garter spring inside a metal case, and the outer diameter is rubber covered to seal the housing bore. Where the fluid is a synthetic ester or the unit runs hotter, the same 25.5 x 41.5 x 8.5 geometry can be quoted in FKM (fluoroelastomer, also written FPM), which holds continuous duty to about +200 C.

Quality Control and Inspection

• Incoming: compound hardness checked before release to production.
• In process: case concentricity, lip geometry, spring seating and the bore grip diameter checked at set intervals.
• Final: measured inner diameter, outer diameter and width, compound hardness, then a visual check on the lip edge and the marking, then packing count verification.
• Traceability: inspection results for each batch are recorded and kept; the inspection scope can be agreed before order confirmation.

Buyers are welcome to arrange third-party inspection before shipment; state the requirement in the enquiry so it can be built into the quotation.

Customization and OEM Service

packaging and logo available upon request

Packaging, Carton and Delivery

Standard packing is individual polybag, inner carton, then export carton. Carton marks, labels and barcodes are printed to buyer specification.

In stock: ships in 1 to 2 days. Not in stock but still in current production: 10 to 15 days. Not in stock and not in production: 25 to 30 days. Minimum order quantity depends on whether the size is a stocked standard or made to order. Pricing, MOQ, freight and trade terms are confirmed in the written quotation. Send an RFQ with quantity and destination port.

How to Order

The more of this you include, the faster and more accurate the quotation:

1. Size or OE number: 25.5 x 41.5 x 8.5 mm, or the number stamped on the seal you are replacing.
2. Quantity and destination: required quantity, destination country and port.
3. Material requirement: NBR as standard, or FKM for synthetic steering fluid or higher running temperature.
4. Marking and packaging requirement: label data, carton marks and barcode requirement.
5. Sample photo or drawing: where the part is matched from a worn unit.
6. Operating conditions: fluid type, working pressure and temperature, and shaft speed, if known.

Frequently Asked Questions

How do I confirm this seal fits my assembly?
Measure the shaft the seal runs on, the bore in the steering pump or rack housing and the depth available, then compare the lip and the rubber-covered diameter with the seal you removed. Those three values decide the fit.

What are the exact dimensions of this oil seal?
25.5 mm inner diameter, 41.5 mm outer diameter and 8.5 mm width. Check them against your own unit or drawing, because counterbore depth differs between steering pumps and racks.

What is the minimum order quantity?
MOQ depends on whether 25.5x41.5x8.5 is held as a stocked size or made to order. Give your required quantity and we will confirm the MOQ and tiered pricing in the quotation.

What is the lead time, and can you ship by sea or air?
In stock: ships in 1 to 2 days. Not in stock but still in current production: 10 to 15 days. Not in stock and not in production: 25 to 30 days. Sea and air freight are both arranged, with cost and transit time confirmed per destination.

Can you supply FKM or HNBR instead of NBR?
Yes. This size can also be produced in FKM (fluoroelastomer) or HNBR where the steering fluid or the running temperature is outside the NBR range. Confirm the compound when you enquire.

Do you provide samples, and are they free?
Evaluation samples can be arranged. Sample cost and freight are quoted per request, and on a confirmed bulk order the sample charge is normally offset against the order value.

Can you produce our packaging and logo?
packaging and logo available upon request.

What information do you need to quote?
The size or the number on your old seal, quantity, steering fluid type, working temperature and pressure, marking and packaging requirement, destination port and preferred Incoterm. A drawing or a sample gives the closest match.

Request a Quotation

Send the 25.5 x 41.5 x 8.5 mm size (or the number on the seal you are replacing), the quantity, your destination and any branding requirement, and we will reply with MOQ, lead time, packing details and pricing.

VKEFOT Seals: oil seals, O-rings and custom rubber parts. Xingtai, Hebei, China.