Home/Caterpillar 3400 Series Parts/Caterpillar HNBR O-Ring, PAI 321278 (OEM 1090077), Pack of 5
O-RING
Caterpillar · Models: 3406E / C15 / C16 / C18 / 3400

Caterpillar HNBR O-Ring, PAI 321278 (OEM 1090077), Pack of 5

Commercial diesel seal & o-ring. Match the listed part and engine identifiers before ordering.
2-Year WarrantyPAI Industries
$22.20
In stock — confirm dispatch timing 9 available
Fitment details

Want us to check the fit? Share any details you have below. All fields are optional. Your request will be included with your order, and a specialist may contact you before fulfillment.

Secure Checkout Review Return Policy Warranty Details Ask About Same-Day Shipping
PAI Part #321278
JAK'S Part #JAKS-321278
Catalog ref109-0077
Catalog ref1090077
Catalog ref4F7387
Catalog refCATERPILLAR 109-0077
Not sure it's the right fit? Call a specialist
(720) 445-6249
Talk to a tech or text a photo of your part tag — we'll confirm fitment before you buy
Kit Membership

Used In These Kits

This part is included in 16 engine & overhaul kits — find yours below.

Complete The Rebuild

Suggested Additional Parts

Commonly sold with this product. These parts are sold separately.

  1. Cat Water Connector Gasket, PAI (OEM 1250434), Pack of 5
    331372Cat Water Connector Gasket, PAI (OEM 1250434), Pack of 5 In stock
    $57.75View ›
  2. Caterpillar O-Ring, PAI (OEM 3P0650), Pack of 10
    321294Caterpillar O-Ring, PAI (OEM 3P0650), Pack of 10 In stock
    $47.40View ›
  3. Cat / Caterpillar THERMOSTAT
    381851Cat / Caterpillar THERMOSTAT In stock
    $32.65View ›
  4. Caterpillar 3406E / C15 / C16 Nut
    340061Caterpillar 3406E / C15 / C16 Nut In stock
    $9.12View ›
  5. Cummins N14 ENGINES C-BRAKE GASKET (Pack of 3)
    131428Cummins N14 ENGINES C-BRAKE GASKET (Pack of 3) In stock
    $26.22View ›
Caterpillar HNBR O-Ring, PAI 321278 (OEM 1090077), Pack of 5
BrandPAI Industries
Part CategorySeals & O-Rings
Sub-TypeO-Ring
Engine MakeCaterpillar
Engine Model3406E · C15 · C16 · C18 · 3400
ConditionNew
Stage / TierStandard

PAI 321278 is a hnbr o-ring for Caterpillar applications. PAI specifies HNBR construction. The manufacturer designates product-level OEM 1090077. PAI cross-references Caterpillar 1090077. PAI lists these application categories: Caterpillar 3406E Series, Caterpillar C15 Engine, Caterpillar C16 Engines, Caterpillar C18 Engine, Caterpillar 3400 Series. Confirm the complete required part number before ordering.

Pack of 5.

Manufacturer product cross-references
Caterpillar 109-0077
Caterpillar 4F7387

PAI Part #: 321278

OEM References:

  • CATERPILLAR 109-0077
  • CATERPILLAR 1090077
  • CATERPILLAR 4F7387

Applications:

  • CATERPILLAR 3406E SERIES
  • CATERPILLAR C15 ENGINE
  • CATERPILLAR C16 ENGINES
  • CATERPILLAR C18 ENGINE
  • CATERPILLAR 3400 SERIES

Warranty: 2.0 year(s)