Trunnion Mounts

Joyce trunnion adapter plates bolt to the base of 2-ton through 20-ton machine screw or ball screw jacks  and ComDRIVEs. They include precision bores for trunnion pins. These are frequently used in installations where a single jack moves through an arc during operation. This jack is often configured with a motor mount or as a ComDRIVE.

Ordering Information:

Since trunnion adapters are bolted directly onto jacks and actuators, they are specified as part of the complete part number. Refer to the ordering section for the products on which they will be used. Machine Screw Jacks, Machine screw ComDRIVEs, Ball screw jacks, Ball Screw ComDRIVEs.

Note: Drawings are artist's conception - not for certification; dimensions are subject to change without notice. 

Trunnion materials:

Structural steel trunnion plate

Design Information:

The customers-supplied trunnion pins should be ground to the “D” diameter shown in the specification chart. These pins should be made of steel with hardness greater than 30 HRC, yield strength greater than 60,000 PSI and be supported to within 1/16 inch of the trunnion adapter plate. The distance between the customer’s mounting surfaces should be no more than the “A” + 0.13 inch. (Refer to Product Specifications chart below.)

Jack ModelCommon DimensionsUpright - InvertedUpright - Inverted Traveling Nut
ABCDEFGHJKLMNPRSTUVWX
2 Ton RWJT/DRWJ 7 1/4 3 1/4 11/4 .7491
.7479
11/4 1.703 3 1/8 2 5/16 11/16 4 11/16 5 3/8 0 4 5/16 2 1/16 11/16 4 11/16 8 3/16 4 3/4 4 13/16 11/16 1 1/2
3 Ton WJ/DWJ 6 1/2 3 7/8 1 1/4 .7491
.7479
1 1/4 1.750 2 1/2 2 5/16 11/16 4 3/8 6 5/8 1/8 4 3/8 2 3/8 3/4 4 3/8 8 1/8 4 3/8 5 1/8 3/4 2
5 Ton WJT/DWJ 8 1/4 5 3/4 1 1/2 .9991
.9979
1 1/2 2.188 3 1/8 2 15/16 13/16 6 3/16 7 3/16 0 5 11/16 1 13/16 1 6 3/16 11 3/16 6 3/16 6 13/16 1 1/2 2 1/2
10 Ton WJ/DWJ 9 7 1/4 2 1.2488
1.2472
1 1/2 2.598 3 3 1/8 1 1/8 6 1/8 7 1/2 0 6 2 1/2 1 5/16 6 1/8 13 1/8 6 1/8 8 7/8 1 31/32 3
15 Ton WJ/DWJ 9 1/2 7 1/2 2 1/4 1.4988
1.4972
1 3/4 2.598 3 1/2 3 3/4 1 1/4 7 8 3/8 0 6 7/8 2 5/8 1 5/16 7 13 7 7 11/16 1 31/32 3
20 Ton WJ/DWJ 11 1/4 8 2 1/4 1.4988
1.4972
1 3/4 2.598 4 1/4 4 1/4 1 1/4 8 1/4 9 5/8 0 8 1/4 2 5/8 1 3/8 8 1/4 14 1/4 8 1/4 8 1 15/16 3
2 Ton RWB/RHWB 7 1/4 3 1/4 1 /14 .7491
.7479
1 1/4 1.703 3 1/8 2 5/16 11/16 7 9 7/16 9/16 7 2 9/16 3/4 4 11/16 9 7/16 4 11/16 6 1/16 1 1/8 3 1/8
5 Ton WB 8 1/4 5 3/4 1 1/2 .9991
.9979
1 1/2 2.188 3 1/8 2 15/16 13/16 9 7/16 12 3/4 11/16 9 7/16 4 3/4 1 1/4 6 3/16 12 3/16 6 3/16 7 1/2 1 1/8 4 1/2
5 Ton HWB 8 1/4 5 3/4 1 1/2 .9991
.9979
1 1/2 2.188 3 1/8 2 15/16 13/16 9 7/16 12 3/4 11/16 9 7/16 4 3/4 1 1/4 6 3/16 12 3/16 6 3/16 7 1/2 1 1/8 3 25/32
10 Ton WBL 9 7 1/4 2 1.2488
1.2472
1 1/2 2.598 3 3 1/8 1 1/8 9 9/16 12 3/4 11/16 9 9/16 3 1 1/4 6 1/8 12 3/4 6 1/8 8 7/16 1 3/4 4 1/2
10 Ton HWBL 9 7 1/4 2 1.2488
1.2472
1 1/2 2.598 3 3 1/8 1 1/8 9 9/16 12 3/4 11/16 9 9/16 3 1 1/4 6 1/8 12 3/16 6 1/8 7 7/8 1 3/4 3 25/32
10 Ton WB/HWB 9 7 1/4 2 1.2488
1.2472
1 1/2 2.598 3 3 1/8 1 1/8 13 1/8 16 3/8 11/16 13 1/8 3 1/8 1 1/4 6 1/8 15 5/16 6 1/8 10 3/8 2 6 5/8
20 Ton WB 11 1/4 8 2 1/4 1.4988
1.4972
1 3/4 2.598 4 1/4 4 1/4 1 1/4 15 3/16 19 7/8 3/8 15 3/16 4 1 1/2 8 1/4 18 1/4 8 1/4 12 2 3/4 6 3/4

Trunnion adapters mounted to inverted jacks will decrease the minimum closed dimension and may shorten the travel.
Contact Joyce/Dayton if multiple trunnion-mounted jacks will be used in a system.

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