ONE-LOK T-SLDE tandem restraints on a mechanical joint tee, catalog render

Render from the T-SLDE catalog. Your size is in the item number.

Item # T-SLDEP12 Questions and answers (5)

ONE-LOK T-SLDE

Two wedge-action glands in tandem for high-pressure mechanical joints on ductile iron pipe.

Call for pricing

Priced by request at every size. Add it to your quote list or call 800.999.2550.

Rated 700 psi at 12 in., with a 2:1 minimum safety factor
SIGMASEAL gasket included with each set
Breakaway bolt tops show when each wedge is set
See all specifications

Pipe size: 12 in.

Made: Import

Finish: Standard

Comes with: Tandem set

Two SLDE glands, extra-long T-bolts or threaded rods, nuts and a SIGMASEAL gasket.

Your distributor

SIGMA sells through waterworks distributors. Order with item # T-SLDEP12.

Quote from SIGMA

Job location

Sends your quote list to the right regional team.

Quantity

Download the T-SLDE submittal

Need help on the job?

Call 800.999.2550. Real people answer, mid-job too.

Right restraint? Selection Tool How far to restrain? Calculator

Everything about the 12 in. T-SLDE.

Details, specs, every size and the questions buyers ask. Open what you need.

Product detailsWhat it does, highlights and documents

About this product

High line pressure asks more of a restrained joint. ONE-LOK T-SLDE puts two SLDE wedge-action glands on the same pipe end, tied to the fitting with extra-long T-bolts or threaded rods, for high-pressure mechanical joint connections to ductile iron pipe.

Highlights

Rated 700 psi at 4 to 16 in., 400 psi at 18 to 24 in. and 350 psi at 30 to 48 in.
Machined break-off bolt tops for precise, consistent fracture
SIGMASEAL gasket with each set, for the rated pressure
2:1 minimum safety factor at every size

Documents

Specifications12 in.: 700 psi · 13.20 in. pipe OD · 58 lb per set

At 12 in.

Item number	T-SLDEP12
Working pressure	700 psi
Safety factor	2:1 minimum
Joint deflection	5°
Ductile iron pipe OD	13.20 in.
Weight, per set	58 lb

Installation at 12 in.

Inserts and break-off bolts, per set (no. / size / torque)	16 / 7/8 in. / 80-90 ft-lb
T-bolts or rods, per set (no. / size / torque)	8 / 3/4 x 7 in. T-bolts / 75-90 ft-lb, 16 nuts
Gasket	SIGMASEAL, included
Gap between glands	1 in. (dimension A)
Custom washers	Listed for 24 to 48 in. in the September 2025 catalog (SW2, SW25, SW125), not in the September 2026 submittal: ask your regional team

Materials and standards

Glands, wedges and actuating bolts	ASTM A536 65-45-12 ductile iron
Wedge hardness	370 BHN minimum
T-head bolts and nuts	High-strength, low-alloy steel to AWWA/ANSI C111/A21.11, 65,000 psi tensile and 45,000 psi yield minimum
Threaded rods and heavy hex nuts	To AWWA/ANSI A21.11/C111, per the sample specification

Ordering

Made	Import
Finish	Standard
Comes with	Tandem set
Sizes	4 to 48 in.
Price list	Import Restraint Products, effective 12/9/24, rev. 4/14/26

Every size and item number14 sizes, 4 to 48 in. · Import, standard, tandem set · priced by request

Showing Import, standard, tandem set. Every size is priced by request. Pick a size to load it.

ONE-LOK T-SLDE item numbers and catalog data by pipe size
Item #	Pressure	Pipe OD	Gasket	Weight, per set
T-SLDEP4	700 psi	4.80 in.	SIGMASEAL, included	13 lb
T-SLDEP6	700 psi	6.90 in.	SIGMASEAL, included	20 lb
T-SLDEP8	700 psi	9.05 in.	SIGMASEAL, included	29 lb
T-SLDEP10	700 psi	11.10 in.	SIGMASEAL, included	46 lb
T-SLDEP12	700 psi	13.20 in.	SIGMASEAL, included	58 lb
T-SLDEP14	700 psi	15.30 in.	SIGMASEAL, included	79 lb
T-SLDEP16	700 psi	17.40 in.	SIGMASEAL, included	99 lb
T-SLDEP18	400 psi	19.50 in.	SIGMASEAL, included	121 lb
T-SLDEP20	400 psi	21.60 in.	SIGMASEAL, included	138 lb
T-SLDEP24	400 psi	25.80 in.	SIGMASEAL, included	207 lb
T-SLDEP30	350 psi	32.00 in.	SIGMASEAL, included	317 lb
T-SLDEP36	350 psi	38.30 in.	SIGMASEAL, included	469 lb
T-SLDEP42	350 psi	44.50 in.	SIGMASEAL, included	688 lb
T-SLDEP48	350 psi	50.80 in.	SIGMASEAL, included	912 lb

Every T-SLDE size is priced by request. T-bolt and rod counts for your size are under Specifications.

Questions and answers5 questions buyers ask about T-SLDE

How is T-SLDE priced?

T-SLDE is priced by request at every size. Add it to your quote list or call 800.999.2550, and your regional team prices it for your job.

Where is the submittal?

Below the Add to quote list button. The T-SLDE submittal is a fillable PDF, so you can type in your project before you send it. The T-SLDE catalog, under Documents, has the sample specification and the install steps. Posted SIGMA submittals are also in the Submittals Library.

What is a tandem restraint?

Two SLDE wedge-action glands on the same pipe end. The first bolts to the fitting with extra-long T-bolts, or threaded rods on 24 in. and up; the second sits 1 in. behind it on the same bolts. A SIGMASEAL gasket comes with each set.

What is it rated for?

700 psi at 4 to 16 in., 400 psi at 18 to 24 in. and 350 psi at 30 to 48 in., with a 2:1 safety factor, per the T-SLDE submittal.

What about washers on 24 in. and up?

The September 2025 T-SLDE catalog lists custom washers for 24 to 48 in., two per rod: SW2 at 24 in., SW25 at 30 and 36 in., SW125 at 42 and 48 in. The September 2026 submittal does not list them. Ask your regional team whether your order needs them.