41x74x11/18 mm Crankshaft Rear Oil Seal BH6832E 90311-41009 NBR, Stepped Rotary Shaft Seal

Product Overview

A 41 x 74 x 11 / 18 mm crankshaft rear oil seal presses into the rear main bore and runs on the crankshaft, holding engine oil in around the flywheel end. This one is a stepped design: the 11 mm section carries the sealing lip and the 18 mm overall body fills the housing depth, with a metal case around the outside.

At a glance:

41x74x11/18 mm | NBR (nitrile butadiene rubber) | single lip with garter spring, metal-cased 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 engine rebuilders and parts wholesalers who buy by dimension. Confirm the 41 mm shaft, the 74 mm bore and the housing depth against your own unit, because the 18 mm overall width is what seats the seal.

Key Features & Benefits

• Stepped body: The 11 mm sealing section sits on the shaft while the 18 mm overall body fills the housing, so the seal seats at the right depth and does not stand proud of the bore.
• Nitrile lip: NBR resists engine oil and stays flexible down to about -30 C, which suits the rear main position where the oil is hot and constant.
• Spring-loaded contact: A garter spring holds the lip against the crankshaft, so contact pressure does not drop away as the seal wears.
• Metal case: The case keeps its diameter under the press fit and stands up to the heat and the small pressure swings at the rear main bore.
• Suited to hot, continuous oil: The lip material is matched to the temperature at the rear main; where the oil runs above the NBR range the same step can be quoted in FKM.
• Checked by dimension: The fit is set by the 41 mm shaft, the 74 mm bore and the housing depth, so a stocked size can be matched to a worn unit from stock.

Dimensions & Specification

Specification	Value
Inner Diameter (ID)	41 mm
Outer Diameter (OD)	74 mm
Width / Height	11 mm / 18 mm
Material	NBR (nitrile butadiene rubber)
Colour	Black
Structure	Single lip, garter spring, metal-cased outer diameter, stepped body (the second width value is the overall width)
Seal Type	Crankshaft rear oil seal
OEM Reference	BH6832E; 90311-41009
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 11 mm / 18 mm values are the lip section and the overall body width. Confirm them against your own sample or a measured shaft and housing bore before releasing an order.

Material & Construction

The lip is NBR (nitrile butadiene rubber), the usual choice for the rear main position where hot engine oil is present continuously. It covers -30 C to +100 C (short peaks to +120 C) and keeps its elasticity on a shaft that is slightly out of round. The lip is backed by a garter spring and the rubber is bonded to a metal case that forms the stepped body. If the engine runs hot or the oil is a heavily additised synthetic, the same stepped geometry can be quoted in FKM (fluoroelastomer), 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, step height and the rubber-to-case 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: 41 x 74 x 11 / 18 mm, or the BH6832E or 90311-41009 number from your parts book.
2. Quantity and destination: required quantity, destination country and port.
3. Material requirement: NBR as standard, or FKM where rear main oil temperature is high or the oil is synthetic.
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: oil type, working temperature and shaft speed, if known.

Frequently Asked Questions

How do I confirm this seal fits my assembly?
Check the 41 mm shaft, the 74 mm bore and the housing depth against the seal being replaced, and pay attention to the stepped body: the 18 mm overall width must match the bore depth, not just the 11 mm lip section.

What are the exact dimensions of this oil seal?
41 mm inner diameter, 74 mm outer diameter, an 11 mm lip section and an 18 mm overall body width. Confirm against your own sample or drawing, because the overall width is what sets the seating depth.

What is the minimum order quantity?
MOQ depends on whether this size is held in stock or produced to order. Send the quantity you need and we will confirm the MOQ with tiered pricing in the quotation.

What is the lead time, and can you ship by sea or air?
Standard sizes normally ship within 7 to 15 working days after order confirmation. Both sea and air freight can be arranged, with transit time and cost confirmed per destination.

Can you supply FKM or HNBR instead of NBR?
Yes. The same stepped geometry can be produced in FKM (fluoroelastomer) or HNBR where rear main oil temperature or the oil type exceeds the NBR range. Confirm the compound when you enquire.

Do you provide samples, and are they free?
Samples for evaluation can be arranged. Sample cost and freight are quoted per request, and on a confirmed bulk order the sample charge is normally set off 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 OE number you are replacing, quantity, material, working temperature and oil type, packaging and marking requirement, destination port and preferred Incoterm. A drawing or a sample gives the most accurate result.

Request a Quotation

Send the 41 x 74 x 11 / 18 mm size (or the OE number 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.