Frequently asked questions
What filters does SDN Filter make?
Air, fuel, oil (lube), hydraulic and coolant filters for construction machinery, agricultural machinery, heavy trucks and generators. The site lists 852 part numbers with photos and dimensions.
Can you match my OEM or aftermarket part number?
Yes. Send the number, a photo of the old filter or its dimensions. Our engineers match it by dimensions and specification and confirm the equivalent before you order.
How do I find a filter by size?
Use the Filter Finder: enter the height, outer diameter and thread of your old filter and a tolerance. Every matching SDN part number is listed with its photo.
What is the difference between a spin-on filter and a filter element?
A spin-on filter has its own steel housing and screws onto the engine or hydraulic head by its thread, and the whole unit is replaced. A filter element (cartridge) sits inside a permanent housing, and only the element is replaced.
Do you offer OEM, private label or custom filters?
Yes, all of them. Buy SDN Filter at wholesale, put your own brand on our filters (private label), or have filters made to your drawing or sample (OEM and ODM).
Can I get samples before a bulk order?
Yes. Tell us the part numbers you want to test. Sample cost and shipping are confirmed in your quotation.
What is your MOQ?
1 piece per part number. Order one filter to test it, or mix many part numbers in one order.
How can I pay?
Samples and small orders: PayPal or card (Stripe). Larger orders: bank transfer. Every proforma invoice states the amount and payment details.
What are your prices and lead times?
They depend on the part number, quantity and packing, so every quotation states them for your order. Send your list and we reply within one business day.
Are the dimensions on this site exact?
They come from our catalog drawings. Before you order, we confirm the dimensions and thread of every part number in writing.
Where is your factory?
In Lishui, Zhejiang, China. SDNFILTER (Lishui) Co., Ltd. is part of Zhejiang Zhenhang Industrial Group (GREEN FILTER).
How do I contact you?
Write to [email protected], message us on WhatsApp +1 808 203 0374, or use the contact form.