Kubota Rear Window Glass – Replaces OEM #RD158-46450
This is an aftermarket replacement for Kubota OEM rear glass #RD158-46450, the fixed rear cab window on Kubota -4 series KX and U mini excavators. It fits the KX033-4, KX037-4, KX040-4, KX042-4, KX057-4, U35-4, U36-4, U48-4 and U55-4.
Specifications: 5 mm (0.20") tempered safety glass, green tint, DOT certified, 745 mm wide × 695 mm high (29.33" × 27.36"), no mounting holes.
Fits the following Kubota models:
KX Series: KX033-4, KX037-4, KX040-4, KX042-4, KX057-4
U Series: U35-4, U36-4, U48-4, U55-4
OEM Replacement
Replaces Kubota OEM Glass #RD158-46450
Product Features
- Glass Type: Tempered safety glass (not polycarbonate)
- Thickness: 5 mm (0.20")
- Width: 745 mm (29.33")
- Height: 695 mm (27.36")
- Tint: Green
- Certification: DOT certified
- Mounting Holes: None
- Location: Rear cab window — fixed rear panel
- Condition: New aftermarket replacement glass
Tempered Glass vs. Polycarbonate
This replacement is tempered glass, the same material type as the factory pane — not polycarbonate. Glass resists scratches and keeps its clarity better than plastic over years of wiper use and cleaning. Tempered glass is heat-treated so that if it breaks it crumbles into small, blunt pieces rather than sharp shards. For forestry, mulching or demolition work with flying debris, see our Kubota excavator polycarbonate windshields.
Installation Information
This listing is for the glass only. The seal, frame, mounting hardware and any adhesive are not included; reuse your existing hardware or source new parts separately.
What's Included
- (1) Kubota rear window glass — replaces OEM #RD158-46450
Not Included: Seal, frame, mounting hardware, adhesive.
Frequently Asked Questions
Which window on a Kubota U55-4 cab is RD158-46450?
It is the fixed rear window of the -4 series cab. Kubota parts sellers list RD158-46450 as "Glass (Rear)", and it is a flat 745 mm × 695 mm (29.33" × 27.36") pane with no holes.
Is RD579-46450 the same rear glass for my KX057-5?
No. RD579-46450 is the rear glass listed for the newer -5 series (KX057-5, U48-5, U55-5). RD158-46450 is the -4 series rear glass, so check which generation your machine is before you order.
How is RD158-46450 different from the RD451-46720 rear sash glass?
They are separate parts. RD451-46720 is a genuine Kubota part called "Glass, Sash, Rear" listed for the U48-4 and U55-4, while RD158-46450 is the main rear cab glass. Match the number on your old glass or parts book.
What part numbers cover the other glass in a KX040-4 or U35-4 cab?
Sellers list RD451-46440 for the front lower glass, RD451-46710 for the front sash glass, RD451-46350 for the front upper glass on the KX057-4/U48-4/U55-4, RD158-46560 for the left upper door glass and RD158-46570 for the U48-4/U55-4 lower door glass.
Does the rear window open on Kubota -4 series mini excavators?
No opening rear window is described. The U35-4 and KX040-4 operator's manuals describe a front windshield that unlocks and slides up and back to a lock at the rear of the cab, and a side window that slides front to rear.
Please Verify Fitment Before Ordering
Confirm OEM part number RD158-46450 by your machine's serial number before ordering. Questions? Call 765-310-3053.
Kubota® is a registered trademark of Kubota Corporation. Forestry Doors is not affiliated with Kubota; OEM numbers are listed for cross-reference only.
