Borelli Splined Coupling Halves - 12000 Series and Flange-Side Coupling Halves - 12200 Series

Description

Construction Features and Materials

The Borelli Splined Coupling Halves – 12000 Series and Flange-Side Coupling Halves – 12200 Series are mechanical components designed for precision coupling in hydraulic power transmission systems. Standard construction uses UNI 16CrNi4/Pb steel, which undergoes surface heat treatment to resist frictional wear and withstand continuous torsional loads. For specific versions of the splined product range, Borelli also uses quenched and tempered UNI 38NiCrMo4/Pb steel with nitriding treatment (Tenifer), achieving mechanical strength of R = 95 ÷ 105 kg/mm².

12000 Series Geometry with Internal Spline Profiles

The 12000 Series combines external chain sprocket teeth with a hub featuring a standardized internal spline profile. The range includes configurations with 1/2″ and 3/4″ pitches:

1/2″ Pitch: versions with 22 external teeth (external diameter E of 94.5 mm and 35×31 internal spline profile with 18 teeth), 24 external teeth (diameter E of 102.5 mm, with 32×38 internal spline profile featuring 17 teeth or 35×31 profile featuring 18 teeth), and 30 external teeth (diameter E of 127 mm with 48×44 internal spline profile featuring 23 teeth).
3/4″ Pitch: versions with 20 external teeth (diameter E of 130.5 mm, with 48×44 internal spline profile featuring 23 teeth or 50×45 profile featuring 24 teeth) and 24 external teeth (diameter E of 156.13 mm, with 48×44 internal spline profile featuring 23 teeth or 58×53 profile featuring 27 teeth). The overall length F ranges from 27 mm for smaller sizes to 40 mm and 48 mm for the 3/4″ pitch versions.

12200 Series Flange-Side Coupling Half Configuration

The 12200 Series flange-side coupling halves feature a cylindrical projection and a machined collar with diameters G, B and L, designed for guided flange positioning and secure fastening. The series shares the same external tooth configurations as the 12000 Series, with 1/2″ pitches (22, 24 and 30 external teeth) and 3/4″ pitches (20 and 24 external teeth). Flange shoulder dimensions H range from 23 mm to 48 mm, while projections I range from 3 mm to 5 mm.

Technical Summary Table of the Main Specifications of the Borelli Splined Coupling Halves – 12000 Series and Flange-Side Coupling Halves – 12200 Series

Specification	Value
Manufacturer	Oleodinamica Borelli
Standard Construction Material	Heat-treated UNI 16CrNi4/Pb steel
Quenched and Tempered Version Material (*)	Quenched and tempered UNI 38NiCrMo4/Pb steel with nitriding treatment (Tenifer)
Mechanical Strength of Quenched and Tempered Steel (R)	95 ÷ 105 kg/mm²
Available External Tooth Pitches	1/2″ – 3/4″
Number of External Teeth – 12000 Series	20, 22, 24, 30
Internal Spline Profiles – 12000 Series	35×31 (18 teeth), 32×38 (17 teeth), 48×44 (23 teeth), 50×45 (24 teeth), 58×53 (27 teeth)
External Diameter E – 12000 Series	94.5 mm to 156.13 mm
Hub Width F – 12000 Series	27 mm, 40 mm, 48 mm
Number of External Teeth – 12200 Series	20, 22, 24, 30
Flange Mounting Dimensions – 12200 Series (G / B / L)	G from 70 to 110 mm; B from 68 to 105 mm; L from 56 to 90 mm
Thickness and Projection – 12200 Series (H / I)	H from 23 to 48 mm; I from 3 to 5 mm

Product Codes

Product Code	Series	External Pitch	Number of External Teeth	Internal Spline / Flange Specifications	Main Dimensions (mm)
12005	12000 Series Splined Coupling Half	1/2″	22	35×31 Profile – 18 teeth	E: 94.5 \| F: 27
12001	12000 Series Splined Coupling Half	1/2″	24	32×38 Profile – 17 teeth	E: 102.5 \| F: 27
12002	12000 Series Splined Coupling Half	1/2″	24	35×31 Profile – 18 teeth	E: 102.5 \| F: 27
12003	12000 Series Splined Coupling Half	1/2″	30	48×44 Profile – 23 teeth	E: 127 \| F: 40
12004	12000 Series Splined Coupling Half	3/4″	20	48×44 Profile – 23 teeth	E: 130.5 \| F: 40
12006	12000 Series Splined Coupling Half	3/4″	20	50×45 Profile – 24 teeth	E: 130.5 \| F: 40
12007	12000 Series Splined Coupling Half	3/4″	24	48×44 Profile – 23 teeth	E: 156.13 \| F: 48
12008	12000 Series Splined Coupling Half	3/4″	24	58×53 Profile – 27 teeth	E: 156.13 \| F: 48
12201	12200 Series Flange-Side Coupling Half	1/2″	22	Flange Shoulder (G: 70, B: 68, L: 56)	E: 94.5 \| H: 23 \| I: 4
12202	12200 Series Flange-Side Coupling Half	1/2″	24	Flange Shoulder (G: 72, B: 68, L: 56)	E: 102.5 \| H: 27 \| I: 3
12203	12200 Series Flange-Side Coupling Half	1/2″	30	Flange Shoulder (G: 81, B: 74, L: 68)	E: 127 \| H: 40 \| I: 3
12204	12200 Series Flange-Side Coupling Half	3/4″	20	Flange Shoulder (G: 82, B: 74, L: 68)	E: 130.5 \| H: 40 \| I: 3
12205	12200 Series Flange-Side Coupling Half	3/4″	24	Flange Shoulder (G: 110, B: 105, L: 90)	E: 156.13 \| H: 48 \| I: 5

Brands

List of Manufacturers Brands

OLEODINAMICA BORELLI

Products

Borelli Splined Coupling Halves – 12000 Series and Flange-Side Coupling Halves – 12200 Series

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