48x102.5x8.5/10.5 mm Rotary Shaft Oil Seal NBR, Rubber-Covered Stepped Seal

Product Overview

A 48 x 102.5 x 8.5 / 10.5 mm oil seal presses into a large bore and runs on a shaft, holding oil in around a bearing or a shaft end. This one is a thin, wide-bodied seal: the 8.5 mm section carries the lip and the 10.5 mm overall body fills the counterbore, with a nitrile lip loaded by a garter spring.

At a glance:

48x102.5x8.5/10.5 mm | NBR (nitrile butadiene rubber) | single lip with garter spring, rubber-covered stepped body | made in Xingtai, Hebei, China | working range -30 C to +100 C (short peaks to +120 C)

VKEFOT produces this size in Xingtai, Hebei, China for wholesalers and repair programmes that buy by dimension. Check the 48 mm shaft, the 102.5 mm bore and the 10.5 mm counterbore depth against your own unit before ordering.

Key Features & Benefits

• Wide body on a large bore: A 102.5 mm outside diameter with a thin section suits large housings where the counterbore is shallow and there is little room for a deep seal.
• Nitrile lip: NBR resists mineral and gear oils and stays flexible down to about -30 C.
• Garter spring: The spring keeps the lip pressed to the shaft, so radial force holds up as the lip wears in.
• Stepped seating: The 10.5 mm overall width gives a defined seating depth, so the seal sits square in the counterbore instead of tilting during the press.
• Rubber-covered outside: The rubber outer diameter grips and seals the bore, which helps on large housings that are hard to machine to a fine finish.
• Chosen by measurement: Shaft diameter, bore and counterbore depth set the fit, so a stocked size can replace a worn seal from stock.

Dimensions & Specification

Specification	Value
Inner Diameter (ID)	48 mm
Outer Diameter (OD)	102.5 mm
Width / Height	8.5 mm / 10.5 mm
Material	NBR (nitrile butadiene rubber)
Colour	Brown
Structure	Single lip, garter spring, rubber-covered outer diameter, stepped body (the second width value is the overall width)
Seal Type	Rotary shaft 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 measured as inner diameter x outer diameter x width; the 8.5 mm / 10.5 mm values are the lip section and the overall body width. Confirm them against your own sample or a measured shaft and bore before ordering.

Material & Construction

The lip is NBR (nitrile butadiene rubber), the general-purpose lip material for oil and grease service, with the body moulded to a thin metal insert. NBR covers -30 C to +100 C (short peaks to +120 C) and tolerates a shaft that is slightly out of round. The lip is loaded by a garter spring and the outer diameter is rubber-covered for grip on a large bore. For higher temperature or synthetic fluid duty the same size can be quoted in FKM (fluoroelastomer), good for continuous duty to about +200 C.

Quality Control and Inspection

• Incoming: compound hardness checked before release to production.
• In process: lip geometry, spring seating, stepped seating face and the rubber-to-insert bond checked at set intervals.
• Final: dimensional check on inner diameter, outer diameter, lip section and overall width, hardness, visual inspection of the lip edge and 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 can 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.

Lead time for standard sizes is typically 7 to 15 working days after order confirmation, and longer for sizes that are not held as standard stock. 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: 48 x 102.5 x 8.5 / 10.5 mm, or the number stamped on your current seal.
2. Quantity and destination: required quantity, destination country and port.
3. Material requirement: NBR as standard, or FKM for higher temperature or synthetic fluid.
4. Packaging requirement: carton marks, label data and barcode requirement.
5. Sample photo or drawing: where the part is matched from a worn original.
6. Operating conditions: fluid type, temperature and shaft speed, if known.

Frequently Asked Questions

How do I confirm this seal fits my assembly?
Measure the 48 mm shaft, the 102.5 mm bore and the counterbore depth, and compare the stepped body with the seal you removed. The 10.5 mm overall width is as important as the 8.5 mm lip section for seating.

What are the exact dimensions of this oil seal?
48 mm inner diameter, 102.5 mm outer diameter, an 8.5 mm lip section and a 10.5 mm overall body width. Confirm against your own sample or drawing, since counterbore depth varies between housings.

What is the minimum order quantity?
MOQ depends on whether 48x102.5x8.5/10.5 is stocked or produced to order. Send the quantity required and we will confirm the MOQ with tiered pricing.

What is the lead time, and can you ship by sea or air?
Stocked sizes normally leave within 7 to 15 working days of order confirmation. Sea and air freight are both arranged, with transit time and cost 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 temperature or the fluid exceeds 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, plus quantity, fluid type, working temperature, packaging and marking requirement, destination port and preferred Incoterm. A drawing or a sample gives the closest match.

Request a Quotation

Send the 48 x 102.5 x 8.5 / 10.5 mm size (or the number on the seal you are replacing), quantity, 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.