ONE-LOK SLDM oversize wedge-action gland, catalog render

Render from the SLDM catalog. Your size is in the item number.

Item # SLDM12 Questions and answers (5)

ONE-LOK SLDM

Oversize wedge-action MJ restraint for pit cast grey iron pipe with Class C and D outside diameters.

View price list (PDF)

Rated 250 psi at 12 in., with a 2:1 minimum safety factor
Fits standard mechanical joints (AWWA C111 and C153) through 20 in.
No special tools; breakaway bolt tops show when each wedge is set
See all specifications

Pipe size: 12 in.

Made: Import

Finish: Standard

Comes with: Gland only

Gland, wedges and actuating bolts.

Your distributor

SIGMA sells through waterworks distributors. Order with item # SLDM12.

Quote from SIGMA

Job location

Sends your quote list to the right regional team.

Quantity

Download the SLDM spec sheet

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. SLDM.

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

Product detailsWhat it does, highlights and documents

About this product

Pit cast grey iron pipe in Class C and D runs oversized next to standard ductile iron ODs. ONE-LOK SLDM is sized for it, with the same wedge action as SLDE: hardened wedges grip the pipe, the gland bolts to the fitting, and the joint stays together under thrust.

Highlights

For pit cast pipe with Class C and D ODs; Class A and B take the standard SLDE
Contoured wedges spread the grip, protecting the pipe wall and cement lining
Cam action lets the wedges bite harder as thrust builds
Allows deflection during installation and settlement afterward, up to the listed deflection

Documents

Specifications12 in.: 250 psi · 13.50 in. pipe OD · 8 break-off bolts · 34.00 lb

At 12 in.

Item number	SLDM12
Working pressure	250 psi
Safety factor	2:1 minimum
Joint deflection	5°
Pit cast pipe OD (Class C and D)	13.50 in.
Gland weight	34.00 lb

Installation at 12 in.

Break-off bolts (no. / size / torque)	8 / 7/8 in. / 75-90 ft-lb
T-bolts (no. / size / torque)	8 / 3/4 x 4.0 in. / 75-90 ft-lb
Gasket	MG-12
Tightening order	T-bolts, then break-off bolts, each in a star pattern
Tools	No special tools

Materials and standards

Gland, 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
Joint dimensions	Standard mechanical joints to AWWA C111/ANSI A21.11 and AWWA C153/ANSI A21.53, through 20 in.

Ordering

Made	Import
Finish	Standard
Comes with	Gland only
Sizes	4 to 20 in.
Price list	Import Restraint Products, effective 12/9/24, rev. 4/14/26

Every size and item number7 sizes, 4 to 20 in. · Import, standard, gland only · item numbers

Showing Import, standard, gland only. Item numbers follow the options above. Pick a size to load it.

ONE-LOK SLDM item numbers and catalog data by pipe size
Item #	Pressure	Pipe OD	Gasket	Gland wt.
SLDM4	250 psi	5.00 in.	MG-4	10.00 lb
SLDM6	250 psi	7.10 in.	MG-6	12.00 lb
SLDM8	250 psi	9.30 in.	MG-8	20.00 lb
SLDM10	250 psi	11.40 in.	MG-10	26.00 lb
SLDM12	250 psi	13.50 in.	MG-12	34.00 lb
SLDM16	200 psi	17.80 in.	MG-16	56.00 lb
SLDM20	150 psi	22.06 in.	MG-20	75.00 lb

Catalog data is for the SLDM gland. The catalog also lists 14 in., which is not on the current price list. Call 800.999.2550 for it.

Questions and answers5 questions buyers ask about SLDM

Where do I find the price?

On SIGMA's price lists. Where an item is on a posted list, the View price list button near the top of this page opens it, and every posted list is on the Price Lists page. SIGMA sells through waterworks distributors, and your distributor sets your price. For contract pricing, ask your regional team.

Where is the spec sheet?

The button below Add to quote list opens the SLDM spec sheet (November 2026): materials, sizes, pressure ratings, coating and deflection. The SLDM catalog has the dimensions, the sample specification and the install steps. Posted SIGMA submittals are in the Submittals Library.

Which pipe is SLDM for?

Pit cast grey iron pipe with the oversized Class C and D outside diameters. Pit cast pipe with Class A and B ODs takes the standard ONE-LOK SLDE with no changes, per the SLDM catalog. Measure the pipe OD and compare it with the table under Every size.

Which sizes can I order?

4, 6, 8, 10, 12, 16 and 20 in. are on the current price list, and SLDMP adds the accessories at 4 to 12 in. The catalog also lists 14 in.; call 800.999.2550 for it.