Roller chain

PTP Roller chain is manufactured to the highest quality standards and holds a number of key quality assurance accreditations. Imported and sold by NBC Group for many years it has proved a reliable alternative to other major brands.

  • Manufactured to BS (DIN8187 ISO/R 606) and ASA (DIN8188 ISO/R 606; ANSI B29,1) standards
  • Available in 5m boxes with connecting link or individual cut lengths
  • Some simplex sizes also available in stainless steel.

BS Chains

Chain size BSSizeAvailability
SimplexDuplexTriplex
05B8 x 3 mmXXX
06B3/8" x 7/16"XXX
0811/2" x 1/8"X
0831/2" x 3/16"X
08B1/2" x 5/16"XXX
10B5/8" x 3/8"XXX
12B3/4" x 7/16"XXX
16B1" x 17.02mmXXX
20B1.1/4" x 3/4"XX
24B1.1/2" x 1!XXX
28B1.3/4" x 1.1/4"XXX
32B2" x 1.1/4"XXX

ASA Chains


Chain size ASASizeAvailability
SimplexDuplexTriplex
ASA 251/4" x 1/8"XXX
ASA 353/8" x 3/16"XXX
ASA 401/2" x 5/16"XXX
ASA 505/8" x 3/8"XXX
ASA 603/4" x 1/2"XXX
ASA 801" x 5/8"XXX
ASA 80 HEAVY DUTY1" x 5/8"X
ASA 1001.1/4 " x 3/4"XXX
ASA 100 HEAVY DUTY1.1/4" x 3/4"X
ASA 1201.1/2" x 1"XXX
ASA 120 HEAVY DUTY1.1/2" x 1"X
ASA 1401.3/4" x 1.1/4"XXX
ASA 140 HEAVY DUTY1.3/4" x 1.1/4"X
ASA 1602" x 1.1/4"XXX
ASA 160 HEAVY DUTY2" x 1.1/4"X


#

Chain length

  • Chain is normally sold in boxes of 5m, or in lengths of an odd number of pitches. A connecting link is used to join the ends, which results in a chain with an even number of pitches.
  • Including an offset link at this point will make a chain with an odd number of pitches.

Chain length is determined by the formula

CL = 2l/p + (Z2-Z1)/2 +p/l.[(Z2-Z1)/6.28] ^2

CL = chain length in pitches
l = center distance in mm
p = chain pitch in mm
Z1 = No of teeth on drive wheel
Z2 = No of teeth on driven wheel

The chain should wrap the drive sprocket in an arc of at least 120°


Power transmission chain troubleshooting guide


ProblemPossible causeSuggested fix
Tight joints (kinking)Dirt or foreign material in chain jointsClean and relubricate chain
Inadequate lubricationReplace chain. Ensure adequate lubrication
MisalignmentReplace and re-align sprockets. Replace chain if required.
Internal corrosion or rustReplace chain. Eliminate cause of corrosion or protect chain
Overload bending pin or spreading rollerReplace chain and eliminate cause of overload.
Rusted chainExposed to moistureImprove lubrication or protect from moisture. Replace chain if required.
Water in lubricantChange lubricant. Stop contamination of lubricant. Replace chain if required.
Inadequate lubricationImprove lubrication system. Replace chain if required.
Turned pinsInadequate lubricationImprove lubrication system. Replace chain if required.
Enlarged holesOverloadReplace chain and eliminate cause of overload.
Broken pinsShear near side plates - Extreme overloadReplace chain. Replace sprockets if necessary. Eliminate cause of overload or redesign drive for larger pitch, or increased strand chain
Shear in middle of pin - FatigueReplace chain. Replace sprockets if necessary. Check expected life achived, or redesign drive for larger pitch chain.
Missing partsMissing at assembly?Replace chain
Broken and/or lostFind and correct cause. Replace chain if required.
Broken cracked or deformed rollersSpeed too highReduce speed. Replace chain if required
Sprockets too smallUse larger sprockets, or redesign drive for smaller pitch chain.
Chain riding too high on sprocket teethEnsure chain under adequate tension at all times. Replace chain if required.
Pin gallingInadequate lubricationReduce speed or load. Possibly redesign drive for smaller pitch chain. Ensure adequate lubrication at all times.
Chain climbs sprocket teethExcessive chain sag or slackRetension chain. Use tensioner units. Check sprockets for damage.
Excessive chain elongation or wearReplace and retension chain
Excessive sprocket wearReplace sprockets and chain
Excessive overloadReplace chain. Eliminate overload. Check design parameters.
Missing or broken cottorsCottors installed improperlyInstall new cottors as per manufacturers specifications
VibrationReplace chain. Reduce vibration. Use larger sprockets.
Excessively high speedReplace chain. Reduce speed or redesign drive for smaller pitch chain.
Exposed surfaces corroded or pittedExposure to corrosive environmentReplace chain. Protect from hostile environment.
Cracked link plates (Stress corrosion)Exposure to corrosive environment coupled with stress from press fitsReplace chain. Protect from hostile environment.
Cracked link plates ( Fatigue)Loading greater than chain's dynamic capacityReplace chain. Reduce dynamic loading or redesign drive.
Battered Link -plate edgesChain striking an obstruction.Replace chain. Eliminate interference.
Worn link plate contoursChain rubbing on casing guide, or obstruction.Replace chain if more than 5% worn. Retension chain. Eliminate interference.
Excessive noiseChain striking an obstructionReplace chain. Eliminate interference.
Loose casing or shaft mountsTighten fasteners. Tension chain.
Excessive chain slack, or overtensionRetension chain according to manufacturer's specifications
Excessive chain elongation or wearReplace and retension chain. Replace sprockets if worn.
Excessive sprocket wearReplace sprockets and chain
Sprocket misalignmentReplace and re-align sprockets. Replace chain if required.
Inadequate lubricationImprove lubrication system. Replace chain if required.
Chain pitch too largeRedesign drive for smaller pitch chain.
Too few sprocket teethUse larger sprockets, or redesign drive for smaller pitch chain.
Wear on inside of roller plate links and one side of sprocketSprocket misalignedReplace and re-align sprockets. Replace chain if required.
Chain clings to sprocketExcessive sprocket wearReplace sprocket. Check chain is of good quality and pre-stressed.
Sprocket misalignmentReplace and re-align sprockets. Replace chain if required.
Vibration (whipping) of chainExcessive chain sag or slackRetension chain. Use tensioner units. Check sprockets for damage.
Uneven wear causing pitch unevennessReplace using pre-stressed chain.


Associated Products


Do you have a special project?

Need some advice? We can help!


oemsales@nbcgroup.co.uk

01952 222300