FS1242 Fuel Water Separator Filter 20 Micron replaces WK940/36X
FS1242 is a spin-on fuel water separator for diesel trucks and tractors with a 1-14 UNS-2B filter head. The 20 micron element removes 90% of free water and 90% of emulsified water at 96% efficiency, and the can is 174.9 mm tall with a 93.04 mm largest diameter. It replaces MANN WK940/36X, FRAM PS6829 and Baldwin BF1249-O.
| Tier Pricing (USD / unit) | |
|---|---|
| Qty | Unit Price |
| 1+ units | $18.99 |
| 10+ units🎯 Recommended | $18.04 |
| 50+ units | $16.14 |
| 100+ units | $15.19 |
📋 Key Specs
| Part Number | FS1242 |
| Filter Type | Spin-on fuel water separator |
| Overall Height | 174.9 mm (6.886 in) |
| Outer Diameter | 93.04 mm (3.663 in) |
| Thread Size | 1-14 UNS-2B |
| Seal | Gasket, 71.88 mm OD x 62.48 mm ID |
| Media | Cellulose |
| Micron Rating | 20 micron (SAE J1985) |
| Efficiency | 96% TWA; 90% free water and 90% emulsified water separation |
| Weight | 0.62 kg |
| Contents | 1 filter, 2 O-rings |
| Application | Diesel engines with a 1-14 UNS-2B spin-on head |
❓ FAQ
FS1242 is rated at 20 micron by SAE J1985. Some listings quote 10 micron for this part number, but the Fleetguard specification sheet gives 20 micron with 90% free water separation, 90% emulsified water separation and 96% efficiency by TWA.
No. This listing is the spin-on element only, supplied with two O-rings. It screws onto the 3831871S bowl and 142784S base already fitted to the engine, and neither of those parts is included.
A single 1-14 UNS-2B thread on top, which is the standard spin-on diesel filter head thread. The gasket is 71.88 mm outside diameter by 62.48 mm inside diameter, and the can is 174.9 mm overall height with a 93.04 mm largest diameter.
Both filter numbers spin onto the same 1-14 UNS-2B head and serve the same separator housing family, so an engine that ran an FS1015 can take this element. Check the bowl and base part numbers on your machine before ordering, since some installations use a different bowl depth.
Free water separation is 90% and emulsified water separation is 90%, with 96% overall efficiency by time weighted average under SAE J1985. Water collects in the bowl below the element and is drained at the bowl valve during service.
MOQ varies by product: 5–100 units for standard parts (see product page). Tier pricing decreases with volume. Custom parts usually ≥ 50 units, evaluated by process.
Stock/short-run: 7–15 days; bulk orders 20–35 days; custom 30–45 days incl. sampling. Note your deadline in the inquiry — sales will confirm capacity.
Add products to the inquiry list and submit with contact info. Sales contact you within 24h and issue a formal quotation (tier pricing + proforma invoice) within 48h. The AI assistant can pre-fill inquiries in chat.
Yes. We develop from drawings/samples and support private labeling. Process: evaluation → sampling (15–25 days) → approval → mass production.
Payment: T/T 30% deposit + 70% before shipment / L/C / Trade Assurance. Shipping: FOB Ningbo/Shanghai, CIF or DDP; EU & NA warehouses; sea/air/express.
ISO 9001 & IATF 16949; CE/UL/ATEX on key products. Every batch ships with inspection reports; third-party inspection (SGS/BV) supported.
Description
Product Overview
FS1242 is a spin-on fuel water separator for diesel trucks and equipment that run a 1-14 UNS-2B filter head. The can is 174.9 mm overall height with a 93.04 mm largest diameter, and the gasket seats at 71.88 mm outside diameter on the standard head land. A 20 micron cellulose element drops free water out of the fuel at 90% separation, and the unit screws onto the 3831871S bowl and 142784S base used on Cummins and Case IH installations.
Key Features
Cross Reference
Specifications
Applications
📄 Downloads
- FJ-1242-datasheet-en.pdf · 2 KB
