Proco Style 445-BD

The Proco Style 445-BD Molded Expansion Joints can be used for corrosive applications that are found in industries such as chemical-petrochemical, industrial process piping systems, power generation plants, pulp/paper plants, water and wastewater sewage, and pollution control systems. Wherever metallic joints, lap joints, or PTFE and FEP-lined rubber expansion joints were previously used, the Proco Style 445-BD can also be used.

Some notable features of the Proco Style 445-BD include:

  • Absorption of pipe-wall and fluid-borne noise
  • Reduction of system stress and strain
  • Isolation of mechanical vibration and motion
  • Superior “Flex Life” and strength
  • Tested force pound and spring rate tables
  • Coated flanges and factory set limit bolts
  • Chemical service capability at minimal cost
  • Elimination of electrolysis
  • Protection against start up and surge forces

For more information about the features and benefits of the Proco Style 445-BD, download our brochure.

For up-to-date pricing and availability information, contact PROCO today.

Nominal Size I.D.Neutral Length InchesMovement Capabilities Based on three Convolution Design¹Spring Rate Capability²Expansion Joint Flange DrillingPressure at Temperature (PSIG) @ °FVacuum Rating ³Weight/ LBS
±Axial(Δx) MovementLateral(Δy) DeflectionAngular DeflectionCompression Spring RateExtension Spring RateLateral Spring RateThrust Factor# HolesThread Hole SizeBolt Circle Flange “A”PTFE Flare O.D. “B”Flange ThicknessNominal Flange O.D.Limit Bolt DiameterBolt Circle Limit Bolt “C”Limit Bolt “EAR” O.D.
ININDEG.LBf/INLBf/INLBf/IN70°100°150°200°250°300°350°400Hg at Temp.
1.003.0000.500.500203044222.8141/2 – 133.1252.000.3134.250.2505.1256.0007261464034292724Not Designed for Vacuum Service2
1.252.6700.394.47020361141712.2541/2 – 133.5002.520.3944.630.2505.1966.85062564236302622225
1.503.5000.750.500207583465.0941/2 – 133.8752.875.3445.000.2505.8756.75072614640342927245
2.004.0001.000.500206047509.1145/8- 114.7503.625.4386.000.3756.8758.12572614640342927249
2.504.6000.980.5102011631928510.0845/8- 115.5004.125.5007.000.3758.1259.375625642363026222211
3.005.0001.000.50020556017016.9145/8- 116.0005.000.5007.500.3758.75010.000726146403429272414
4.005.2501.250.6252072608025.4085/8- 117.5006.188.6259.000.3759.87511.125726146403429272420
5.006.0001.250.6252014038840032.3383/4- 108.5007.313.75010.000.50011.50013.000625642363026222226
6.006.0001.250.6252019013019550.2483/4- 109.5008.500.75011.000.50012.50014.000726146403429272431
8.008.0001.250.6252030438845776.0783/4- 1011.75010.625.93813.500.50014.75016.250484234302622222249
10.008.7501.250.62520458388457128.55127/8- 914.25012.7501.00016.000.50017.50019.000484234302622222264
12.009.0001.375.68820529445457144.72127/8- 917.00015.0001.00019.000.62520.50022.000484234302622222288
20.0020.4701.6251.00020185371571374.57201 1/8- 825.00023.0001.18827.5001.42031.50035.4384842343026222222243

1. Movements are non-concurrent and based from Neutral Length with Limit Bolts installed.
2. Spring Rate Capability is based on 1″ of movement at zero pressure conditions.
3. Vacuum Rating is based from fully extended position. CF = Contact Factory.


Series 445-BD Materials of Construction
Description1″ Through 12″14″ Through 20″
FlangesDuctile IronZinc Plated Carbon Steel
Reinforcing RingsStainless SteelStainless Steel
Limit BoltsCarbon SteelCarbon Steel
NutsCarbon SteelCarbon Steel
WashersCarbon SteelCarbon Steel

In order to properly and successfully install Proco Style 445-BD PTFE expansion joints, specific service conditions must be met, and it’s important that the process is implemented using the guidelines set forth in our brochure. Contact Proco for additional advice if the system requirements exceed those of the expansion joint selected.

For detailed information on service conditions, proper alignment, anchoring, and storage techniques, download the PROCO Style 445-BD Brochure.