Screw Jacks | Screw Jacks

4x4 Screw Jack

Specifications:

For standard dressed 4x4 lumber

Overall Height:	14-1/4" Screwed Down
Range of Adjustment:	6"
Acme Screw Size:	1-1/4" Diameter
Top:	4" x 4" x 5" Square Tube and 1-1/2" x 6-1/2" Pipe
Base Plate:	4" Square Plate with 4 - 5/16" Holes Provided
Weight:	13 lbs.
Item #:	SJ-4 or SJ-4G

Description: Inner pipe is packed with grease to prevent rusting.

DO NOT EXCEED RECOMMENDED ALLOWABLE LOAD FOR DOUGLAS FIR AS SHOWN IN CHARTS.

6x6 Screw Jack

Specifications:

For standard dressed 6x6 lumber

Overall Height:	15-1/2" Screwed Down
Range of Adjustment:	6"
Acme Screw Size:	1-3/4" Diameter
Top:	6" x 6" x 5" Square Tube and 2" x 6-1/2" Pipe
Base Plate:	5" Square Plate with 4 - 3/8" Holes Provided
Weight:	22 lbs.
Item #:	SJ-6 or SJ-6G

Description: Inner pipe is packed with grease to prevent rusting.

ALL SHORING APPLICATIONS SHOULD BE PROPERLY BRACED TO PREVENT LATERAL SHIFTING. CONSULT WITH A CERTIFIED ENGINEER FOR APPROVAL BEFORE CONSTRUCTION BEGINS.

Allowable Shore Loads Wood Shore Capacities

Douglas Fir Dimensional Lumber

Unsupported Length In Feet	Load Capacity In Pounds
4	15,000
6	12,000
8	7,200
10	5,000
12	3,000
14	2,600
15	-0-

Chart is based on values for #1 Douglas Fir South - Free of knots.

Fully extended allowable load of 4x4 screw jack: 15,000 lbs.
Load capacity based on 2.5/1 Safety Factor.

Allowable Shore Loads Wood Shore Capacities

Douglas Fir Dimensional Lumber

Unsupported Length In Feet	Load Capacity In Pounds
6	30,000
8	30,000
10	27,000
12	20,000
14	15,000
16	11,500
18	8,800
20	6,000

Chart is based on values for #1 Douglas Fir South - Free of knots.

Fully extended allowable load of 6x6 screw jack: 30,000 lbs.
Load capacity based on 2.5/1 Safety factor.