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Description
dresser coupling Dresser Style 38 Bolted Coupling – WatermainsupplyDescription Dresser Bolted Coupling Style 38 Bolted Coupling Steel Pipe Flexible mechanical coupling for water, wastewater, and industrial piping. Plain end steel pipe in nominal sizes in through 48 in. AWWA C219 compliant. Sizes in 48 in AWWA C219 Compliant NSF 61 & 372 Certified 6 Gasket Compounds Available Stainless Steel Option Fusion Bonded Epoxy Coating Widely separated pipe ends? For applications where a standard body coupling cannot span the
Description
Dresser Bolted Coupling
Style 38 Bolted Coupling
Steel Pipe
Flexible mechanical coupling for water, wastewater, and industrial piping. Plain-end steel pipe in nominal sizes ½ in through 48 in. AWWA C219 compliant.
Sizes ½ in – 48 in
AWWA C219 Compliant
NSF 61 & 372 Certified
6 Gasket Compounds Available
Stainless Steel Option
Fusion-Bonded Epoxy Coating
Widely separated pipe ends? For applications where a standard-body coupling cannot span the gap, the long-body Dresser Style 40 bridges wider pipe separations without spool pieces or additional fittings.
View Style 40 →
Overview
The Dresser Style 38 is a bolted mechanical coupling engineered for flexible, leakproof connections on steel pipe in water, wastewater, and industrial piping systems. No threading, beveling, or precise pipe alignment required — installs with standard wrenches only.
The resilient gasket design absorbs vibration, accommodates thermal pipe movement, and allows angular deflection — enabling curves to be laid using straight pipe lengths without bends or elbows. Compliant with AWWA C219.
Key Advantages
Tool-Only Installation
No threading, beveling, or exact alignment required. Installs with standard wrenches directly in the field.
Absorbs Pipe Movement
Resilient gaskets absorb vibration and accommodate thermal expansion and contraction at the joint.
Angular Deflection
Permits angular deflection — curves can be laid with straight pipe, reducing fittings cost and labor.
½ in to 48 in Standard
One product line covers virtually any plain-end steel pipe application. Larger custom sizes available on request.
Fusion-Bonded Epoxy
Standard coating provides superior corrosion protection in buried, submerged, and aggressive service.
All-Stainless Option
Available in Type 304 or Type 316 stainless steel for highly corrosive service conditions.
6 Gasket Compounds
Compatible with potable water, wastewater, petroleum, chemicals, gases, and high-temperature service.
AWWA C219 + NSF 61/372
Industry-standard certifications for Grade 27 and EPDM gasket configurations.
Materials of Construction
Followers (½ in – 1½ in)
Ductile or Malleable Iron
Small-bore service
Followers (2 in & Larger)
AISI C1012 or ASME SA36 Steel
Single-piece thru 12 in; 2-piece bar for larger
Middle Ring
ASTM A513 / A635 / SA675 Gr.60
Steel sleeve body
Bolts & Nuts
AWWA C111 / ANSI A21.11
E-coated steel standard; Type 316 SS optional
Standard Gasket
Grade 27 Buna-S
See Gasket Options below
Standard Coating
Fusion-Bonded Epoxy
Factory-applied
Gasket Material Options
The Style 38 is supplied with one of six gasket compounds depending on service media, temperature, and chemical compatibility. Select the gasket matching your application from variant options at checkout or contact us for compounds not shown.
Grade 27 Buna-S (Standard)
Styrene-butadiene rubber. General water and wastewater service. NSF 61 and NSF 372 certified for potable water.
Grade 42 Buna-N
Nitrile rubber. Petroleum products, oils, hydrocarbons, and fuel service.
Fluorocarbon (Viton)
For aggressive chemicals and high-temperature fluids where standard rubber compounds would fail.
Butyl
Gases, chlorinated water, and ozone service. Excellent gas permeation resistance.
EPDM
Potable water service. NSF 61 and NSF 372 certified. UV and ozone resistant.
High-Temperature
Service up to 1,200°F where extreme heat exceeds standard rubber compound limits.
Stainless Steel Construction
For highly corrosive service, the Style 38 is available in all-stainless steel construction (Type 316 standard; Type 304 substitutable). Middle ring: Type 316 SS per ASTM A240 with No. 1 mill finish (optional A380 pickle-and-passivation finish). Followers: Type 316 SS only — single-piece thru 12 in, 2-piece bar follower for larger sizes. Bolts: Type 316 with rolled threads. Nuts: Type 316 with Xylan coating. Meets AWWA C219.
SS Working Pressure: 150 PSI · Test Pressure: 250 PSI. Stainless steel couplings are custom-built and made to order with extended lead times — consult factory for project requirements.
Engineering References & Downloads
Pipe OD Reference Chart
Outside-diameter cross-reference for steel, PVC, polyethylene, ductile iron, cast iron, and asbestos cement pipe — sizes ½ in to 60 in. Verify OD before specifying coupling size.
Download Pipe Chart
Style 38 Steel Submittal
Official Dresser submittal for steel pipe construction with full dimensional and pressure specifications. For engineering review and project files.
Download Steel Submittal
Style 38 Stainless Submittal
Official Dresser submittal for Type 304 / Type 316 stainless steel construction. Specifications for corrosive service applications.
Download SS Submittal
Sizes & Specifications — Steel Pipe
| Nom. Size (in) | Pipe OD (in) | Ring Length (in) | Bolts (Qty × Dia × Length) | Working Press (PSI) | Max Test (PSI) | Weight (lbs) |
|---|---|---|---|---|---|---|
| ½ | .840 | 3½ | 2 × ½ in × 6 in | 1500 | 2250 | 2 |
| ¾ | 1.050 | 5 | 2 × ½ in × 7¼ in | 1500 | 2250 | 3 |
| 1 | 1.315 | 5 | 2 × ½ in × 7¼ in | 1500 | 2250 | 4 |
| 1¼ | 1.660 | 5 | 2 × ½ in × 7¼ in | 1500 | 2250 | 4 |
| 1½ | 1.900 | 5 | 2 × ½ in × 7¼ in | 1500 | 2250 | 5 |
| 2 | 2.375 | 5 | 2 × 5/8 in × 8¼ in | 1500 | 2250 | 7 |
| 2½ | 2.875 | 5 | 3 × 5/8 in × 8¼ in | 1500 | 2250 | 13 |
| 3 | 3.500 | 5 | 4 × 5/8 in × 6 in | 1100 | 1650 | 13.5 |
| 4 | 4.500 | 5 | 4 × 5/8 in × 6 in | 1000 | 1500 | 16.5 |
| 5 | 5.563 | 5 | 4 × 5/8 in × 6 in | 1205 | 1808 | 23.5 |
| 6 | 6.625 | 7 | 6 × 5/8 in × 8¼ in | 1029 | 1544 | 31 |
| 8 | 8.625 | 7 | 6 × 5/8 in × 8¼ in | 807 | 1211 | 38 |
| 10 | 10.750 | 7 | 8 × 5/8 in × 8¼ in | 657 | 986 | 49 |
| 12 | 12.750 | 7 | 8 × 5/8 in × 8¼ in | 558 | 837 | 56 |
| 14 | 14.000 | 7 | 8 × 5/8 in × 10-3/4 in | 510 | 765 | 60 |
| 16 | 16.000 | 7 | 10 × 5/8 in × 10-3/4 in | 449 | 673 | 70 |
| 18 | 18.000 | 7 | 10 × 5/8 in × 10-3/4 in | 401 | 602 | 75 |
| 20 | 20.000 | 7 | 12 × 5/8 in × 10-3/4 in | 362 | 543 | 86 |
| 22 | 22.000 | 7 | 14 × 5/8 in × 10-3/4 in | 330 | 495 | 98 |
| 24 | 24.000 | 7 | 14 × 5/8 in × 10-3/4 in | 304 | 456 | 105 |
| 30 | 30.000 | 7 | 16 × 5/8 in × 10-3/4 in | 243 | 364 | 120 |
| 36 | 36.000 | 7 | 18 × 5/8 in × 10-3/4 in | 253 | 379 | 181 |
| 40 | 40.000 | 7 | 18 × 5/8 in × 10-3/4 in | Consult Factory | Consult Factory | 198 |
| 42 | 42.000 | 10 | 20 × 5/8 in × 15 in | 346 | 519 | 351 |
| 48 | 48.000 | 10 | 22 × 5/8 in × 15 in | 304 | 456 | 399 |
Working pressures per Dresser Style 38 Steel Pipe Submittal (2021), calculated per Barlow’s formula at ½ minimum yield. Sizes above 48 in available — consult factory.
Angular Deflection Per Coupling
| Pipe Size Range | 5 in Ring | 7 in Ring | 10 in Ring |
|---|---|---|---|
| ½ in thru 2 in OD | 6° | 6° | — |
| Above 2 in thru 14 in OD | 4° | 4° | 4° |
| Above 14 in thru 30 in OD | 2° | 4° | 4° |
| Above 30 in thru 37 in OD | 1½° | 3° | 3½° |
| Above 37 in thru 42 in OD | — | 2½° | 3½° |
| Above 42 in thru 54 in OD | — | 2° | 3° |
Pipe end must remain past end of gasket by minimum 1 in after deflection.
Applicable Standards
AWWA C219
Bolted Sleeve-Type Couplings
For plain-end pipe
ASTM A513 / A635
Middle Ring Steel
Material specifications
AWWA C111 / ANSI A21.11
Bolt Specifications
Industry-standard fasteners
NSF 61 & NSF 372
Potable Water Certified
Grade 27 and EPDM configurations
⚠ Seal Only — Pipe Joint Must Be Anchored
The Style 38 provides a pressure seal only. When pipe pullout could occur, the pipe joint must be independently anchored or restrained. Failure to anchor the joint could result in escaping line content and cause property damage, serious injury, or death. Confirm restraint requirements before installation.Installation — Step by Step
No special tools required beyond a torque wrench and basic hand tools.
- Pipe End PreparationClean all dirt, rust, oil, and loose scale from pipe end. Inspect gasket seating surface — any gouges or grooves must be corrected before assembly.
- Mark Center PointsMeasure back on each pipe end: ½ the middle ring length plus 2 in. Chalk mark both ends to center the coupling over the joint.
- Position FollowersSlide the follower(s) over the pipe end(s) before assembling any other components.
- LubricateWipe gaskets clean. Lubricate each gasket, pipe OD, and middle ring flares with soapy water or non-petroleum lubricant. Use antifreeze in freezing weather.
- Assemble Middle RingSlide lubricated gaskets over each pipe end, then assemble the middle ring onto one pipe end.
- Join Pipe EndsStab second pipe end into middle ring. Center between chalk marks. Pipe end must extend past end of gasket by minimum 1 in after any angular deflection.
- Install FastenersInstall all bolts and hex nuts. Draw up finger tight before torquing.
- Torque SequenceTighten nuts on opposite sides in a cross-pattern, drawing followers up evenly. Do not fully torque one side before the other.
Torque Specifications
| Bolt Diameter | Required Torque (Ft. Lbs.) |
|---|---|
| 3/8 in & ½ in | 35 |
| 5/8 in | 75 |
| ¾ in | 90 |
Important
For single-gasket products, reduce all torque values by one-half. Stainless steel bolts must be lubricated before installation to prevent thread galling.
Ready to Order?
Confirm pipe OD, gasket grade, and any special requirements before placing your order.
Submittal
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
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