CAT 118-5910 316mm Long Spacer Boss

CAT 118-5910 is an integrated boss assembly (with sealing groove and mounting flange) specifically designed for Caterpillar hydraulic systems. It is suitable for fixing medium and high pressure pipelines and positioning hydraulic valve manifolds. The following is raw data and does not include information on replacement parts.

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes
Model 118-5910, Type: Hydraulic Boss Assembly (Flange Type + Internal Thread + Sealing Groove), Material: 4130 Alloy Steel (Quenched and Tempered + Nitrided), Unit Weight: 0.38 kg (0.84 lbs), Operating Temperature: -40℃ to +140℃, Surface Nitriding Layer Thickness: 15-20 μm, Hardness: HV 700-850, Rated Life: ≥15000 hours (Standard Conditions), Sealing Rating: IP67

Key Dimensions (Metric/Imperial):
Flange Outer Diameter: 63.50 mm (2.500 in), Boss Outer Diameter: 44.45 mm (1.750 in), Boss Length: 38.10 mm (1.500 in), Internal Thread: M27×2, Flange Thickness: 12.70 mm (0.500 in), Sealing Groove Size: φ38×2.5 mm (0.500 in) O-ring compatible, bolt holes 4×φ10.5 mm (uniformly distributed), center distance 50.80 mm (2,000 in), coaxiality ≤0.02 mm, surface roughness Ra≤0.8 μm
Matching and performance parameters: Compatible pipeline pressure ≤35 MPa (5000 psi), compatible O-ring size 114×2.65 mm (nitrile rubber), flange flatness ≤0.03 mm, rated axial load ≥120 kN, rated radial load ≥90 kN, hydraulic shock resistance ≥50 MPa (instantaneous)
Structure and compatibility characteristics: Integrated flange design: One-piece forged flange + boss, no welding structure, high rigidity, suitable for rigid fixation of high-pressure hydraulic pipelines, preventing pipeline vibration fatigue cracking.

Nitriding surface treatment: Surface nitriding strengthening, wear-resistant and corrosion-resistant, suitable for hydraulic oil (mineral oil/synthetic oil) conditions, extending the service life of seals.

Precision Sealing Groove: A dedicated O-ring sealing groove ensures reliable high-pressure sealing, reduces the risk of hydraulic leakage, and is suitable for connecting and positioning valve assemblies, pump bodies, and pipelines.

Compatible Machines and Application Scenarios:

Excavators: Suitable for installing hydraulic main valves and fixing boom cylinder pipelines in models such as 320D and 323D2.

Loaders: Suitable for connecting hydraulic control modules and pilot oil circuits in models such as 966M and 972M.

Hydraulic Systems: Compatible with hydraulic accessories for Cat 3500 series engines and high-pressure oil pipe mounting brackets, providing pipeline positioning and sealing functions.

Installation and Maintenance Points (Original Data):

Installation: Clean the flange surface and sealing groove, ensuring they are free of oil and metal shavings. After installing the O-ring, apply hydraulic oil for lubrication. Pre-tighten the bolts to a torque of 45-50 N·m (alloy steel bolts).

The flange surface mating gap should be ≤0.05 mm. Use a cross-symmetrical tightening method to prevent uneven loading from causing seal failure.

After installation, perform a 30-minute pressure test at 35 MPa. No leakage indicates合格 (qualified).

Maintenance: Check the sealing condition every 3000 hours. Replace any aged/damaged O-rings immediately.

Regularly check bolt torque to prevent loosening. It is recommended to change the appropriate hydraulic oil every 2000 hours (API CF-4 and above).