Super SJC - SJC Inspection Standards: Body and Screw; Body Inspection Criteria and Limits; Screw Inspection Criteria and Limits

■ INSPECTION STANDARDS FOR SJC
Item Inspectionmethod Limitofuse Remedy
Visuallycheckoruse
colordyestofindcracks.
Checkwearordeformation
ofshackleandscrewhole.
Whenthediameterofanyonepartof
circumferenceofanyholeexceedsthe
respectivesizeinthetablebelow.
Whenfoundvisually.
Whenthedisplacementofthecenterof
ScrewandCamexceeds2mm.
A
B
φD2 φD1
（mm）
（mm）
22.5
27.5
26.5
27.5
36.5
27.5
45.5
32.3
D1
D2
2 310.5
Ratedcapacity 
(ton)
Ratedcapacity 
(ton)
lengthofwear
brokentooth
crack
29.3 29.3 29.3 34.2
2 310.5
Measurethejawopening.
WhenthedifferenceofAandBexceeds5%.
(5mmormoreagainst100mmindepth.)
Whenfoundvisually.
Whenthedisplacementofthescrew
centerexceeds2mm.
Whenthemovementisnotsmooth.
Whenanybrokentoothisfound.
Whenfoundvisually.
Whenthedegreeofwearexceeds0.5mm..
Diameter（mm）
Whenthreadpartoncircumferenceexceeds
therespectivesizeinthetablebelow.
Screw
Body
Discard
Visuallycheckorusecolor
dyestofindcracks.
Visuallycheckforbending.
Measurethescrewteeth
forwear.
Visuallycheckormeasure
thedegreeofwear.
Visuallycheckorusecolor
dyestofindcracksatthe
teethbottom.
Visuallycheckforbroken
teeth.
Replace