Hino Spring Bumper Cushion 48331-1040

1. Introduction

In the suspension system of medium and heavy-duty trucks, the spring bumper cushion is a small rubber component with an outsized job: protecting the chassis frame. On Hino trucks, OEM part number 48331-1040 refers to the front leaf spring bumper cushion mounted between the frame and the spring at the end of the compression stroke. When a fully loaded truck hits a pothole and the leaf spring compresses to its limit, this cushion absorbs the impact progressively — preventing destructive metal-to-metal contact. A failed cushion is often the first step toward frame cracks, broken spring leaves and cab noise. This guide gives European and North American OEMs and purchasers everything needed to source the Hino spring bumper cushion 48331-1040 with confidence.

2. Technical Details: Structure, Material and Performance

2.1 Structure

48331-1040 is a compression-molded solid rubber block, typically featuring a trapezoidal or contoured impact face and a flat mounting base. The contoured face creates progressive stiffness: soft response to small impacts, firm support under heavy compression, eliminating harsh bottoming-out. Depending on the batch configuration, a metal insert or bolt hole secures the cushion to the frame bracket, keeping it in place under full-load operation.

2.2 Material and Compound

The compound is based on natural rubber (NR) formulated to OEM anti-vibration standards with anti-fatigue and anti-ozone additive systems. Natural rubber's high resilience and low heat build-up allow the cushion to survive high-frequency compression cycles without fatigue cracking. Weather-resistant surface treatment handles European winter road salt as well as high-temperature climates. Hardness is controlled at 60±5 Shore A, balancing cushioning comfort with load-bearing support.

2.3 Performance Advantages

Compared with low-cost reclaimed-rubber alternatives, the OEM-grade 48331-1040 achieves compression set ≤25% (70°C × 22h), meaning it retains its designed height after years of heavy loading instead of collapsing. Hebei Huami New Material Technology Co., Ltd. manufactures under the IATF 16949 quality system, with mixing, curing temperature and cure time fully parameter-controlled. Batch-to-batch hardness variation stays within ±3 Shore A — the consistency metric OEM auditors examine first.

3. Vehicle Application List (Reference)

The fitment below is compiled from the Hino 48331-series front spring bumper numbering pattern. Always verify against the vehicle VIN and the official Hino EPC before ordering:

Series	Representative Models	Years (Reference)	Position
Hino 500 Series Ranger	FC / FD / FG	2003–2017	Front leaf spring – frame stop
Hino 500 Series Ranger	GD / FL / FM	2003–2017	Front leaf spring – frame stop
Hino Ranger (previous gen.)	FC3J / FD3H etc.	1990s–2002	Front leaf spring – frame stop
Hino 300 Series Dutro (selected GVW)	XZU series	Verify by VIN	Front suspension stop
Export chassis	500 Series LHD/RHD export builds	2003 onward	Front leaf spring – frame stop

4. Cross-Reference Numbers

Common written variants and related numbers for 48331-1040 are listed below. Because this number has limited coverage in public cross-reference databases, we recommend sending a photo or drawing of the original part for engineering confirmation:

Type	Number	Note
OEM standard format	48331-1040	Hino genuine number
No-hyphen format	483311040	Common in customs/ERP systems
Spaced format	48331 1040	Seen on e-commerce listings
Related series numbers	48331-1090 / 48331-1100	Different GVW specs — do not interchange
Toyota-group numbering logic	48331-xxxxx	Prefix 48331 = front spring bumper
Aftermarket brands	Brand-specific codes	Confirm by dimensional drawing

5. Typical Failure Symptoms

• Cracking and chunking: surface ozone cracks or missing chunks — the cushion has aged out and lost most of its damping capacity.

• Permanent collapse: the cushion sits visibly lower than a new part; under full load the spring strikes the frame with a dull metallic thud.

• Detachment or displacement: loosened bolts or rubber-to-insert debonding shifts the cushion off the load center, accelerating one-sided wear.

• Increased cab vibration and noise: impacts over speed bumps and potholes transmit directly into the frame, felt clearly at the steering wheel and seat.

• Consequential damage: prolonged operation without cushioning leads to frame bracket cracks and first-leaf spring breakage — repairs far more costly than the cushion itself.

6. Key Specifications

Item	Specification	Note
OEM number	48331-1040	Hino front spring bumper cushion
Material	Natural rubber NR (anti-fatigue compound)	Alternative compounds on request
Hardness	60±5 Shore A	Batch variation ≤ ±3
Tensile strength	≥ 15 MPa	ISO 37
Compression set	≤ 25% (70°C × 22h)	ISO 815
Operating temperature	-40°C to +100°C	Ozone & weather resistant
Dimensions	Per engineering drawing (2D/3D available)	Custom molding supported
Surface / color	Black, smooth molded finish	Laser logo marking available
Quality system	IATF 16949 / ISO 9001 / ISO 14001	Hebei Huami factory

7. Installation Notes

• Clean the frame bracket before fitting: remove old rubber residue and rust — an uneven seat causes unbalanced loading and early cracking.

• Replace in pairs per axle: left and right cushions should be replaced together to avoid height mismatch and skewed frame loading.

• Torque to specification: for bolted versions, use OEM-spec bolts torqued per the service manual. Never weld the cushion in place.

• No mineral grease: mineral oils swell and degrade rubber; if lubrication is needed during fitting, use soapy water only.

• Check the stop clearance after installation: with the truck unloaded, verify the designed gap between cushion and spring — an abnormal gap indicates fatigued spring leaves that should also be inspected.

• Re-torque after 100 km: recheck bolt torque and cushion position after roughly 100 km of loaded operation.

8. FAQ

Q1: Are 48331-1040 and 48331-1090 interchangeable?

Not recommended. They belong to the same series but serve different GVW/axle-load specs with different heights and stiffness. Confirm by VIN or physical dimensions.

Q2: Are you a factory or a trading company?

Factory-direct. Hebei Tongsource International Trade Co., Ltd. is the wholly-owned export subsidiary of Hebei Huami New Material Technology Co., Ltd., a company listed on the Beijing Stock Exchange — manufacturing and export under one roof.

Q3: What is the MOQ?

Typically 200–500 pcs depending on the specification. For tooled part numbers we accept small trial orders; samples are free (freight collect).

Q4: What is the lead time? Can you do private-label packaging?

15–25 days for standard orders. Neutral packaging, branded color boxes, custom labels and mixed pallets built to EU/US warehouse requirements are all supported.

Q5: How do I confirm fitment for my vehicles?

Send us the VIN, photos of the original part (number side visible) or a dimensional sketch. Our engineering team returns a fitment confirmation within 24 hours.

Q6: What warranty do you offer?

12 months or 100,000 km, whichever comes first. Third-party test reports and PPAP documentation are available for volume orders.

Q7: Can you develop other Hino rubber parts beyond your catalog?

Yes. We support custom molding from drawings or samples, covering cab mounts, engine mounts, equalizer bushings and the full range of commercial-vehicle anti-vibration rubber parts.

Q8: Which payment terms do you accept?

T/T and L/C; credit terms negotiable for long-term volume customers. PayPal/Western Union accepted for small trial orders.

9. Conclusion & Get a Quote

The 48331-1040 front spring bumper cushion is small, but it sits at a critical point in your Hino truck's chassis reliability chain. Sourcing an OEM-grade replacement manufactured under IATF 16949 with traceable parameters is the most cost-effective way to protect frames, springs and warranty budgets. Hebei Tongsource International Trade Co., Ltd. — the wholly-owned subsidiary of Beijing Stock Exchange-listed Hebei Huami New Material Technology Co., Ltd. — supplies Hino rubber anti-vibration parts factory-direct to OEMs and purchasers worldwide. Contact us today for a free 48331-1040 sample, full specification sheet and volume quotation. Email or WhatsApp us — we reply within 24 hours.