WarningBS Single Pitch
ANSI Single Pitch
ANSI Double Pitch

WARNING

Offset Link

Serious injury or property damage could result if
the chain breaks due to incorrect selection of chain,chain installed improperly, or chain run without thesafe-guard. Please read the instruction manual
thoroughly prior to any attempt at installation.

Standard One-Pitch Offset Link is handy to workwith an odd number of chain links. The pin andtwo plates are slip ﬁt. However, it is at least 35%
lower in fatigue strength than the chain itself. It is
not recommended to use in the application wherefrequent, impact loads at high speed driving arerequired.
Two-pitch offset link is available for that application.
The Two-Pitch offset link consists of an offset link
and a roller link connected with a riveted pin.

Ultimate Tensile Strength

ENGI. 81X

This is the point at which, the roller chain will breakwith a load applied one time. Note that the Ultimate
Tensile Strength is not the allowable working load.
Safety factor must be considered when selecting
the roller chain. This catalog shows most of theMaximum Allowable Load for your convenience.
As a rule of thumb, a roller chain should never beloaded above 50% of Ultimate Tensile Strength foreven one cycle. For a multiple-strand roller chain,consult the multiple-strand factor chart.

Cotter Pin, Spring Clip
Maintain 60-degree angle for the prongs of thecotter pin. Do not re-use the cotter pin. Do not use
the cotter pin commercially available in the market,
as it is different from our custom made pins. Be
sure to insert the spring clip properly in the grooveof the pin. Install the spring clipʼs solid end side
pointing to the direction chain runs.

Guarding
Technical Information

The chain can break in normal service due to theeffect of wear, fatigue, or unexpected overloads.
Therefore, a roller chain drive should have adequate guarding to prevent personal injury orproperty damage.

Connecting Link
A traditional slip-ﬁt connecting link is for ease ofassembly. However, this type of connecting link is
20% lower in fatigue strength than the chain itself.
SY new standard connecting link with speciallydesigned slip-ﬁt cover plate provides almost thesame strength as chain itself.

106 Sugiyama Chain

Rust Corrosion
Generally, the chain is lubricated for its ﬂexibility
and rust prevention. However, lack of maintenanceand/or a corrosive environment could cause thechain to rust. If the chain is corroded, its capacity
is dramatically reduced and the link plates could
break even with the slightest load applied.

Caution

BS Single Pitch

1) Always lock out machinery power switch before attempting removal , installation, or any servicing of chain2) Wear eye and face protection when grinding, driving, or disassembling pins.
3) Always wear gloves, protective clothing and safety shoes with steel toe when working with chains.
4) Make absolutely sure that chain is properly supported to prevent uncontrolled movement of chain and parts.
5) Chain pressers and breaking tools are recommended to be in good working order and to be used according to instructions.
6) Avoid plating or welding assembled chains or components.
7) Never repair damaged chains by replacing only the component parts.
8) Damaged chain may be yielded and therefore should not be reworked.

MAINTENANCE CHECK LIST

Sprocket Misalignment

Chain Wear and Elongation

Lubrication
On slow speed drives, where manual lubrication is used, if
drip lubrication is used check for adequate oil ﬂow andproper application to the chain.
With bath or pump lubrication, check oil level and add oil
if needed. Check oil for contamination and change oil ifneeded. If pump lubrication is used, check each oriﬁce to be
sure if it is clear and is directing oil onto the chain properly.

Recommended Replacement
Measure the chain wear elongation and if elongation exceeds
functional limits or is greater than 1.5% (0.18 inch in one foot)replace the entire chain.
Do not connect a new section of chain to a worn chain
because it may run roughly and damage the drive. Do notcontinue to run a chain worn beyond 3% elongation because
the chain will not engage the sprockets properly and it may
damage the sprockets.

Cutting Riveted Chain

Generally caused by an overloaded drive ; extreme misalignment ; excessive elongation causing chain to jump sprocket
teeth; heavy shock; improper drive design geometry; foreign
objects.
Recalculate initial drive design and make necessary correction. Inspect sprockets and shafts for proper alignment orlooseness.

The two pins of a pin link must be driven out of the link plate.
Strike the pins alternately to avoid distortion of the roller linkplates as well as the plates of the adjacent links.
Chain cutting tools can also be used. Follow their instruction
carefully.

Wear on inside of the link plates and on one side of sprocket
teeth may be caused by a misalignment of sprockets.
Realign sprockets and shafts. Inspect chain carefully, readjust chain properly or replace.

Removing Chain
Turn the drive until a connecting link is fully engaged with
one of the sprockets so as to relieve the tension on the connecting pin.
The connecting link may then be removed.

Technical Information

Broken Chain Parts

Link Plate Wear

ENGI. 81X

Normal wear will cause some increase in chain length.
However, if a sudden increase in elongation occurs, look forsevere wear on the tips of sprocket teeth. This may be casedby any of the following : excessive loading or shock loading, displacement and/or wear in bearings, displacement oftake-up ,or under-designed drives.
Excessive elongation may be an indication that chain and/or
sprockets should be replaced.
Before replacing chain or sprockets recalculate initial drive
design. Check chain tension if there is too much accumulated slack in the drive.

Can be caused by broken links and chain rollers,extreme
misalignment, elongation, chain jumping sprocket teeth,loose sprockets, broken teeth ,accumulation of dirt packed
into the chain or sprockets teeth, interference by foreign
objects, contacting a ﬁxed object.
Check for worn broken or missing parts. Check alignment ofshafts and/or sprockets.

ANSI Double PitchWear on the sides of sprocket teeth generally indicates
improper installation of sprockets and/or shafts. If shafts
are out of parallel or not in the same plane, non-symmetrical
wear will appear on sprockets or chain rollers.
After proper alignment is made retighten set screws insprocket hubs.

Excessive NoiseANSI Single Pitch

Inspect on regularly scheduled basis for worn, damaged or
broken parts ,possible interferenceby other systems components, and proper lubrication.
Normal maintenance procedures can prevent most of theconditions described below.
Carefully inspect roller chain drives on the same schedule asassociated equipment.

Inserting New Links
Insert only on new roller chain. Pitch variance between a newlink and an old link, especially one which is elongated due towear, will cause shock when the new link engages the sprockets.

Installing New Chain
Chain and/or related parts should be visually inspected fordamage, which could have occurred during shipping prior
to installation.
Never install new chain on worn sprockets as this will permanently damage chain. With new chain and sprockets installed
check for proper and sprockets installed, check for propertension and alignment.

107