We provides a significant roller chains advantage for hundreds of applications coping with operating conditions that are hot or cold, wet or dry, dusty or requiring cleanliness and all of these solutions combine excellent wear resistance and fatigue resistance with a long, reliable working life. Roller chain is a power transmisssion component.It is composed by four parts.They are plate,roller,bush and pin. The materials are as follow%uFF1A Plate:40Mn,45Mn,40Cr. Roller:10#,20#,45#,40Cr. Bush:10#,20#. Pin:20CrMnMo,30CrMnTi,40Cr. Roller chains are widely used for general industrial applications.They are available in simplex, duplex and triplex with riveted or cottered. American Standard Roller Chains 1. ANSI Standard Short Pitch Power Transmission Roller Chains (and Bushed Chains as well): 25-240 2. ANSI Standard Short Pitch High Performance Roller Chain (all parts made of special alloy steel, with solid seamless bushes and wide waist linkplates) 3. ANSI Standard Short Pitch Straight Linkplate Roller Chains: C40-C240 4. ANSI Standard Short Pitch Heavy Duty Roller Chains: 60H-240H 5. T Series Super Roller Chains: T40-T140 6. HT Series Super Roller Chains: HT60-HT140 7. SHT Series Super Roller Chains: SHT80-SHT140 8. ANSI Standard Short Pitch Bushed Chains (Rollerless) 9. Roller Chains for Chain Couplings: 4012-12022 10. ANSI Standard Double Pitch Transmission Roller Chains: A2040-A2120 European Standard Roller Chains 1. BS/DIN Standard Short Pitch Power Transmission Roller Chains: 03B-48B 2. BS/DIN Standard Short Pitch High Performance Roller Chain (all parts made of special alloy steel, with solid seamless bushes and wide waist linkplates) 3. BS/DIN Standard Short Pitch Self-Lubricating Roller Chains (Maintenance Free Chains) 4. BS/DIN Standard Marine Engine Roller Chains (Marine Engine Chain): 32BM-72BMBS/DIN Standard Short Pitch Straight Linkplate Roller Chains: C08B-C48B 5. BS/DIN Standard Short Pitch Bushed Chains (Rollerless) 6. BS/DIN Standard Double Pitch Transmission Roller Chains: 208B-232BL

Conveyor chains, like transmission roller chain, can be manufactured to a number of different international standards. The main standards available are:British Standard (BS) and ISO Standard Chain. Large Pitch Conveyor Chains (Long Pitch Engineering Class Conveyor Chains) 1. ISO Standard Solid Pin Conveyor Chains (ISO 1977): M,MT 2. ISO Standard Hollow Pin Conveyor Chains (ISO 1977): MC,MCT 3. BS Standard Metric Series Solid Pin Conveyor Chains (BS 4116): E,ET 4. BS Standard Metric Series Hollow Pin Conveyor Chains (BS 4116):EC,ECT 5. BS Standard Imperial Series Solid Pin Conveyor Chains (BS 4116): Z,ZT 6. BS Standard Imperial Series Hollow Pin Conveyor Chains (BS 4116): ZC,ZCT 7. DIN Standard Conveyor Chains (DIN 8167 and DIN 8168): FV,FVH,FVT 8. ANSI Standard Plain Conveyor Chain (ANSI B29.15): 0703-2430 9. Standard Bucket Elevator Chains: DT150-DT250 10. Bearing Bush Conveyor Chains 11. Bearing Roller Conveyor Chains Short/Double Pitch Conveyor Chains 1. BS/DIN Standard Short Pitch Attachment Chains: 08B-24B 2. BS/DIN Standard Double Pitch Conveyor Chains:C208B-C224BL 3. ANSI Standard Short Pitch Attachment Roller Chains:40-160 4. ANSI Double Pitch conveyor Attachment Chains: 2040-2120 5. ANSI Double Pitch Conveyor Roller Chains: C2040-C2162H 6. ANSI Double Pitch Conveyor Attachment Chains: C2040-C2122H 7. BS/DIN and ANSI Short Pitch Hollow Pin Chains: 08BHP-12BHP,40HP-80HP 8. ANSI Double Pitch Hollow Pin Chains: C2040HP-C2080HP,C2042HP-C2082HP 9. ISO/BS/DIN Large Pitch Hollow Pin Chains:MC,BS,FVT Series 10. Made-to-Order Hollow Pin Chains: 260 & 262 11. Side Bow Chains (Special Curved Chains): 08BSB-10BSB,35SB-80SB 12. Free Flow Conveyor Chains: Double plus chain,Triple speed chain and Accumulator chain 13. Side Roller Conveyor Chains: 40PST-100PST,C2040PSR-C2100HPSR 14. Top Roller Conveyor Chains: 40TR-100TR,C2040TR-C2100TR

Transmission chains also named driving chain,it is one kind of roller chains.It is used for driving engine,sprocket or other machines.We use high quality materials and heat-treated to ensure wear life. 1. Motorcycle Bushed Chains: 10-270H 2. Motorcycle Roller Chains: 420-630 3. Motorcycle O Ring Chains (and Motorcycle X Ring Chains): 428HO-630HO 4. Motorcycle Silent Chains 5. Bicycle Chains: 1/2"x1/8", 1/2"x3/32" 6. coupling roller chain 7. car chain 8. Other driving chain.

Stainless steel roller chains or stainless steel chain,compared with carbon steel roller chain, is suitable for corrosive conditions involving food,chemical pharmaceuticals,etc,and also suitable for high and low temperature conditions.The specification includes 06BSS-32BSS,25SS-160SS,A2040SS-A2162HSS,C2040SS-C2122HSS etc.And its material is stainless steel SUS 304. European Standard Stainless Steel Roller Chains 1. BS/DIN Standard Stainless Steel Ultra Miniature Chains: 03BSS,04BSS 2. BS/DIN Standard Short Pitch Stainless Steel Roller Chains:05BSS-32BSS 3. BS/DIN Standard Short Pitch Stainless Attachment Chains:06BSS-32BSS 4. BS/DIN Straight Linkplate Stainless Roller Chains:C08BSS-C32BSS 5. BS/DIN Double Pitch Stainless Steel Transmission Roller Chains: 208BSS-232BLSS 6. BS/DIN Double Pitch Stainless Steel Conveyor Roller Chains: C208BSS-C224BLSS 7. Stainless Steel Anti Backbend Chains for Ventilation System: KSA,KSC,KSL,KSM 8. Stainless Steel Film Binding Chain American Standard Stainless Steel Roller Chains 1. ANSI Standard Stainless Steel Micro Pitch Chains: 11SS,15SS 2. ANSI Short Pitch Stainless Steel Roller Chains: 25SS-160SS 3. ANSI Short Pitch Stainless Steel Attachment Chains: 25SS-160SS 4. ANSI Straight Linkplate Stainless Steel Roller Chains: C35S-C160SS 5. ANSI Heavy Duty Stainless Steel Roller Chains: 40HSS-240HSS 6. ANSI Double Pith Stainless Steel Transmission Roller Chains: A2040SS-A2162HSS 7. ANSI Double Pitch Stainless Steel Conveyor Roller Chains: C2040SS-C2122HSS 8. ANSI Double Pitch Conveyor Attachment Chains: C2040SS-C2122HSS 9. Short Pitch Stainless Steel Hollow Pin Chains: 08BHPSS-12BHPSS,40HPSS-80HPSS 10. Double Pitch Stainless Steel Hollow Pin Chains: C2040HPSS-C2082HPSS 11. Large Pitch Stainless Steel Hollow Pin Chains: MC,EC,ZC,FVH Series 12. Large Pitch Stainless Steel Solid Pin Conveyor Chain: ISO,BS,DIN or JIS 13. ANSI Stainless Steel Side Bow Chains: 08BSBSS-12BSBSS,35SBSS-80SBSS 14. ANSI Adapted Stainless Steel Chains: 40SS Sticker,40ss Tent 15. ANSI Engineering Plastic Chains: 40PC-60PC 16. ANSI Poly Stainless Steel Chains: 25PS-60PS 17. One Piece Stainless Steel Table Top Chains (Flat Top Chains, Slat Band Chains): SS815,SS881,SS881T 18. Two Piece Stainless Steel Table Top Chains:SS884,SS1684,SS1874 19. Stainless Steel Silent Chains (only 3/16" stainless steel silent chain) 20. Stainless Steel Leaf Chains (both AL and BL/LH stainless steel leaf chain) In the form,we have listed the techinical data for the main specification. CHAIN NO. Pitch Width Roller Plate Pin Max  Allowable Load kgf Approx Weight kg/m P W Dia Height Thickness Dia Lengths inch mm mm R H1 H2 T1 T2 D F G G1 25SS 1/4" 6.35 3.18 3.30 5.00 5.80 0.75 0.75 2.30 3.80 4.80 --- 12 0.14 35SS 3/8" 9.525 4.76 5.08 7.60 9.00 1.20 1.20 3.59 5.80 7.00 7.60 27 0.33 40SS 1/2" 12.70 7.94 7.92 10.20 11.80 1.50 1.50 3.96 8.25 9.35 10.10 45 0.63 50SS 5/8" 15.875 9.53 10.16 13.00 14.60 2.00 2.00 5.06 10.10 11.65 12.60 70 1.01 60SS 3/4" 19.05 12.70 11.91 15.50 17.50 2.40 2.40 5.95 12.50 14.15 15.40 105 1.44 80SS 1" 25.40 15.88 15.88 20.40 24.00 3.10 3.10 7.94 16.10 17.75 18.80 180 2.52 100SS 1-1/4" 31.75 19.05 19.05 24.80 30.10 3.90 3.90 9.52 20.10 --- 23.10 260 3.74 120SS 1-1/2" 38.10 25.40 22.23 30.00 35.00 4.70 4.70 11.10 25.20 --- 28.60 390 6.08 C2040SS 1" 25.40 7.94 7.92 11.70 11.70 1.50 1.50 3.96 8.20 9.35 10.10 45 0.50 C2042SS 1" 25.40 7.94 15.88 11.70 11.70 1.50 1.50 3.96 8.20 9.35 10.10 45 1,20 A2040SS 1" 25.40 7.94 7.92 10.10 11.70 1.50 1.50 3.96 8.20 9.35 10.10 45 0.40 C2050SS 1-1/4" 31.75 9.53 10.16 14.60 14.60 2.00 2.00 5.06 10.10 11.65 12.60 70 0.84 C2052SS 1-1/4" 31.75 9.53 19.05 14.60 14.60 2.00 2.00 5.06 10.10 11.65 12.60 70 1.26 A2050SS 1-1/4" 31.75 9.53 10.16 12.60 14.60 2.00 2.00 5.06 10.10 11.65 12.60 70 0.66 C2060SS 1-1/2" 38.10 12.70 11.91 17.10 17.10 2.40 2.40 5.95 12.50 14.15 15.40 105 1.10 C2060HSS 1-1/2" 38.10 12.70 11.91 17.10 17.10 3.10 3.10 5.95 14.10 15.70 16.60 105 1.37 C2062HSS 1-1/2" 38.10 12.70 22.23 17.10 17.10 3.10 3.10 5.95 14.10 15.70 16.60 105 2.05 C2080HSS 2" 50.80 15.88 15.88 23.00 23.00 3.90 3.90 7.94 17.90 19.40 20.80 180 2.41 C2082HSS 2" 50.80 15.88 28.58 23.00 23.00 3.90 3.90 7.94 17.90 19.40 20.80 180 3.37 06BSS 0.375" 9.525 5.72 6.35 8.10 8.10 1.00 1.25 3.28 6.10 7.40 --- 27 0.39 08BSS 0.5" 12.70 7.75 8.51 10.20 11.80 1.50 1.50 4.44 8.20 9.50 --- 50 0.65 10BSS 0.625" 15.875 9.65 10.16 13.00 14.60 1.65 1.65 5.04 9.60 11.10 --- 66 0.92 12BSS 0.75" 19.05 11.68 12.07 16.00 16.00 1.80 1.80 5.65 11.10 12.60 --- 90 1.24 16BSS 1" 25.40 17.02 15.88 20.80 20.80 3.20 4.00 8.27 17.70 19.25 20.20 209 2.65  

We supply various kinds of high quality special heat treated steel alloys special chains.Like Sewage Treatment Chains, Steel Industry Chain, Sugar Mill Chains, Mining Industry Chain, Escalator Step Chains, Trencher Chains, Beer Bottling Washer Chains, Paving Machine Chains, Pasteurizer Chains, Palm Oil Mill Chains,etc. Special chain is also reffered as non-standard chain.It is a special application chain in different areas.Because of the non-standard size,Special chains are manufactured according to the drawing or sample. 1. Escalator Step Chains, Escalator Drive Chain: T67-24S 2. Trencher Chains (Digging Chains): 015H-TR2690 3. Asphalt Paving Chains, Paving Machine Chain: SS40L-RMC15128 4. Anti Back Bend Tin Printer Chains (Tin Printing chains,Metal Printing chains) 5. Flow Conveyor Chains:DK4011S-DK160H250M 6. Tobacco Industry Machinery Chains 7. Beer Bottling Washer Chains: Type 1-Type 22 8. Pasteurizer Chains: Type 1- Type 8 Coal Mining Chain (Mining Industry Chain) 1. Coal Mining Conveyor Chain 2. Shuttle Car Chain 3. Bridge Conveyor Chain 4. Wash Box Chain, Coal Washer Chain 5. Jig Washer Chain 6. Specialty Mine Chains   Steel Mill Chain (Steel Industry Chain) 1. Steel Drag Chains:WT30150-WT280350 2. Saddle Chains with Attachments:JM03075-JM51450 3. Saddle Chains: 03075-25200 4. Heavy Duty Carrier Chains for Steelworks:60300-200600 5. Aluminum and Copper Die Chains: 25265-08063 6. Barge Unloader Chain, Bucket Elevator Chain 7. Coil Conveyor Chain, Dam Date Chain, Draw Bench Chain 8. Dummy Bar Chains for Continuous Casting 9. Plate Mill Chain, Tension Linkage Chain, Transfer Chain, Tubing Mill Chain Sewage Treatment Chains / Waste Water Treatment Chains 1. Collector Tank Pintle Chains: 700 Class Pintle chains 2. Collector Tank Roller Chains 3. Screen Chains 4. Bar Screen Chains 5. Drive Bush Chains Sugar Mill Chains Cane Harvester Chains (254, 264, SS2038) Cane Carrier Chains (09060, 09061, 1796, SS600, 09063) Intermediate Carrier Chains (Cast Type; 5174E4, 901E41-901E44, 901E51) Bagasse Carrier Chains & Intermediate Carrier Chains (Roller Type; 09060, 2184, 1796) Juice Strainer Conveyor Chains (4103) Diffuser Block Link Chains:NF250.NF500 Other Sugar Mill Chains: Drop Forged Rivetless Chains, Welded Steel Chains Bushed Sugar Mill Chains: SR234-SRH124 Straight Sidebar Sugar Mill Chains:RF204-120018 Offset Sidebar Sugar Mill Chains: RO3140-RO2178A Bushed Sugar Mill Chains: HS188-HS150 Sugar Mill Bushed Roller Chains: HS578-HS800 Palm Oil Mill Chains (Palm Oil Chain, Palm Oil Conveyor Chain)

Engineering chains offered by us are manufactured from high-performance base materials to ensure increased wear life. We use various grades of steel, heat-treated to precise specifications and assembled with accurate press-fits to withstand the requirements of today's powerful, high-production equipment. We offer heavy-duty chains designed specifically to meet the demanding needs of a vast array of industries - all designed to prolong wear life under rigorous operating conditions. 1. Oil Field Roller Chains (ISO 606A, ANSI B29.1M) - Simplex, Duplex, Triplex Oil Field Chain: 80OFC-240OCF - Quadruplex and Quintuplex Oil Field Chain: 80OFC-240OFC - Sextuplex Oil Field Chain: 80OFC-240OFC - Octuplex Oil Field Chain: 80OFC-160OFC - Decuplex Oil Field Chain: 120OFC,140OFC 2. Offset Sidebar Steel Drive Chain for Oil Field Application: Pitch 78.11 mm, Pitch 103.20 mm 3. Engineering Class Heavy Duty Offset Sidebar Drive Chains (Steel Drive Roller Chains): OS2010-OS5628    

Leaf chains includes AL, BL/LH, LL series.Our range of leaf chain for materials handling applications is used worldwide for straddle carriers, forklift trucks and on major civil engineering works such as flood defence barriers. Chain pitch Pitch (distance between each pin or plate hole) accuracy and pin hole diameters (holes in link plates) are maintained on every component during manufacture. This ensures consistent precision performance and good movement of the leaf chain joints. Link Plates Plates are made from a special steel which can withstand sudden loads and provides maximum resistance to breakage Pins Pins are manufactured from a special steel which has excellent resistance to bending. This increases the wear life of the chain. Inner Link Plates Movement of the inner plates is improved by close control of the pin and plate hole dimensions. This reduces rubbing (friction) to a minimum so the chain operates more economically and efficiently.

Our agricultural chains are strictly built in accordance with ISO487. The chains are made of premium steel alloy, manufactured and assembled by automatic machines, advanced heat-treatment and surface consolidating techniques.And they are typically applied in combine harvesters, round balers, feed wagon lifts, etc. Agricultural chains is also referred as agricultural roller chain or agriculture chain.It is one of the roller chains used for agricultural machine.It includes several types.Like CA type steel agricultural chains and S type steel agricultural chains. Agricultural Chains 1. Agricultural Attachment Chains: S32-S88,A550-A620 2. Agricultural Roller Chains: CA550-CA620 3. Combine Harvester Chain 4. Walking Tractor Chain 5. Agricultural Sticker Chains

High tensile chains,also can be called G80 chain or G80 link chain.It uses the material of high-quality alloy steel and also it is done by heat treatment.So the high tensile chain has high working load and breaking load.It is widely used for hoisting,pulling,enlacing,fishnet falling and balance for elevator etc. 1. Material:high-quality alloy steel. 2. Surface treatment:self-color,polishing,blackened,painted,plastic coating,hot-dip galvanize,elcctro-galvanized. 3. Manufacture standard:ISO,DIN,BS,JIS,ASTM 4. Quality Grade:G80,G100 5. Safety factor:min 4 6. We also can produce the non-standard or special lifting chain according to the clients’requriment.

Round link chains,also can be called link chains.It is widely used for industry in different countries.We can supply different standards for different countries.Also we can supply different grade chains,Like G30 chains,G43 chains,G70 chains,G80 chains,G100 chains. Stainless steel link chain,compared with alloy steel or carbon steel link chain.Its material is SUS304 or SUS316.We supply stainless steel link chains of below standard: 1. Japanese standard stainless steel link chain 2. DIN766 standard stainless steel link chain 3. DIN763 standard stainless steel link chain 4. DIN5686 standard stainless steel link chain 5. Korean standard stainless steel link chain 6. Australian standard stainless steel link chain 7. ASTM80 standard stainless steel link chain 8. NACM90 standard stainless steel link chain

We offer a complete line of high quality chain platewheels and sprockets for American and European standard.Products are available in Type A,B,C,D,BW,CW and DW.The material is carbon steel,alloy steel,stainless steel,cast iron,cast steel.The type ofbore available includes stock bore(pilot bore,standard bore,reboreable bore,minimum bore),finished bore,taperbushed bore(TB,QB and ST),bearing bore(BB),spline bore(SP),square bore(SQ) and lock-assembled bore(LA).Unless other state all sprockets are offered with induction hardened teeth with black oxidized surfacefor longer service life chain platewheels and sprockets for European market: 1.steel platewheels and Hub sprockets for SB/DIN Roller chains., 03B,04B,05B,06B,08B,10B,12B,16B,20B,24B,28B,32B 2.Steel Sprockets(Type C,SB)for BS/DIN Roller chains 10B,12B,16B,20B,24B,28B,32B 3.Steel sprockets(Type D,SB)for BS/DIN Roller chains 06B,08B,10B 4.Steel Hub Sprockets(FB)for BS/DIN Roller chains 06B,08B,10B,12B,16B,20B 5.Steel Sprockets(TB)for BS/DIN Roller chains 06B,08B,10B,12B,16B,20B,24B,28B,32B 6.Cast Iron Sprockets(SB,GG25)for BS/DIN Roller chains 06B,08B,10B,12B,16B,20B,24B 7.Cast Iron Sprockets(TB,GG25)for BS/DIN Roller chains 06B,08B,10B,12B,16B,20B 8.Stainless steel Sprockets(SB)for BS/DIN Stainless Steel Roller chains 03BSS,04BSS,05BSS,06BSS,08BSS,10BSS,12BSS,16BSS,20BSS,24BSS,28BSS,32BSS 9.Idler Sprockets with Ball Bearing for BS/DIN Standard Roller chains 05B,06B,08B,10B,12B,16B,20B 10.Double Single Sprockets(SB)for BS/DIN Roller chains 06B,08B,10B,12B,16B,20B 11.Double Single Sprockets(TB)for BS/DIN Roller chains 06B,08B,10B,12B,16B,20B 12.Weld-On Sprockets and Weld-On Hubs for BS/DIN Roller chains 06B,08B,10B,12B,16B,20B,VT,WT,XT,YT Steel Hubs. 13.Steel Platewheels and Hub Sprockets(SB)for BS/DIN Double pitch Roller chains 208B,210B,212B,216B,C208B,C210B,C212B,C216B 14.Table Top Chain Platewheels 15.Chain wheel for ISO Standard Solid Pin and Hollow Pin Conveyor Chains(ISO 1977) M20,M28,M40,M56,M80,M112,M160,M224,M315,M450,M630,M900,MC28,MC56,MC112,MC224 Chain platewheels and sprockets for American market 1.steel platewheels and hub sprokcets(SB)for ANSI standard roller chains M10,15,25,35,41,40,50,60,80,100,120,140,160,180,200,240 2.steel sprockets(Type C,SB)for ANSI standard roller chains 40,50,60,80,100,120,140,160,180,200,240 3.steel sprockets(FB)for ANSI standard roller chains 25,35,41,40,50,60,80,100 4.steel sprockets(TB)for ANSI standard roller chains 35,41,40,50,60,80,100,120,140,160 5.steel sprockets(QB)for ANSI standard roller chains 6.steel sprockets(ST)for ANSI standard roller chain. 7.stainless steel sprockets(SB)for ANSI standard stainless steel chains 8.Double single sprockets(SB)for ANSI standard roller chains. 40,50,60,80,100 9.Double single sprockets(FB)for ANSI standard roller chains. 35,40,50,60,80,100 10.Double single sprockets(TB)for ANSI standard roller chains. 35,40,50,60,80,100 11.Double single sprockets(ST)for ANSI standard roller chains. 12.weld-on sprockets and weld-on hubs for ANSI standard roller chains 40,50,60,80,100;V,W,X,XX,Y steel hubs 13.steel platewheels and sprockets(SB)for ANSI Double pitch roller chains 2040,2050,2060,2080,2100,2120,2042,2052,2062,2082,2102,2122 14.steel platewhees and hub sprockets(TB)for ANSI Double pitch roller chains 2040,2050,2060,2080,2100 15.steel platewhees and hub sprockets(ST)for ANSI Double pitch roller chains 2040,2050,2060,2080 16.idler sprockets with ball bearing for ANSI standard roller chains 25,35,40,50,60,80 17.Flame cut sprockets(SB)for engineering class drive chains 1)D1654 series(or 62 series):pitch 1.654" 2)D2500 series(or 64 series):pitch 2.500" 3)D3067 series(or 1568 series):pitch 3.067" 4)D3075 series(or 1030 series):pitch 3.075" 5)D3500 series(or 238 series):pitch 3.500" 6)D4063 series(or 1240 series):pitch 4.063" 7)D4073 series(or 1245 series):pitch 4.073" 8)D4090 series(or 4122 series):pitch 4.090" 9)D4500 series(or 635 series):pitch 4.500" 10)D5000 series(or 1207 series):pitch 5.000" 11)D5500 series(or 5542 series):pitch 5.500" 12)D6000 series(or 6042 series):pitch 6.000" 18.flame cut sprockets(SB)for engineering class conveyor chains 1)C2609 series(or 78 series):pitch 2.609" 2)C3075 series(or 82 series):pitch 3.075" 3)C4000 series(or 124 series):pitch 4.000" 4)C6050 series(or 132 series):pitch 6.050" 19.steel pintle chain sprockets(Type D,FB):662,667X,88K 20.Chain wheels for type S and C steel roller chains(ISO 487) S32,S42,S45,S55,S62,S77,S88,CA550,CA620,CA555,CA557 Note: 1.SB=Stock bore,pilot bore,minimum bore,straight bore,reboreable bore,plain bore,minimum plain bore(MPB) 2.FB=finished bore,bored to size(BTS) 3.TB=TB type taperbushed bore 4.QB=QB type taperbushed bore 5.ST=ST type taperbushed bore 6.LA=locking assembly bore 7.SP=spline bore 8.SQ=square bore 9.BB=bearing bore