{"id":262,"date":"2026-07-31T07:24:30","date_gmt":"2026-07-31T07:24:30","guid":{"rendered":"https:\/\/5speedtransmission.com\/?post_type=product&p=262"},"modified":"2026-07-31T07:24:30","modified_gmt":"2026-07-31T07:24:30","slug":"double-sprockets-for-two-single-chains-asian-standard","status":"publish","type":"product","link":"https:\/\/5speedtransmission.com\/it\/prodotto\/double-sprockets-for-two-single-chains-asian-standard\/","title":{"rendered":"Double Sprockets for Two Single Chains Asian Standard"},"content":{"rendered":"
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<\/p>\n

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40SD \u2013 80SD<\/p>\n

Available Types<\/p>\n<\/div>\n

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Z=12 \u2013 21<\/p>\n

Tooth Count Range<\/p>\n<\/div>\n

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C45 Hardened<\/p>\n

Induction Teeth<\/p>\n<\/div>\n

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JIS B1801<\/p>\n

Asian Standard<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

Double Sprockets for Two Single Chains \u2013 Asian Standard<\/h2>\n
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The SD designation follows the pattern: 40SD<\/strong> = double simplex sprocket for 40B chain; 60SD<\/strong> = double simplex for 60B chain, and so on. The range covers 40SD, 50SD, 60SD and 80SD, with tooth counts from Z=12 to Z=21. Bore is stock bore \u2014 the hub is machined to your required shaft diameter and JIS B1301 keyway on order, up to the maximum bore listed for each tooth count. Material is C45 with induction-hardened teeth.<\/p>\n

Applications include wide-chain Japanese and Korean agricultural machinery (grain elevators, threshers, combine harvesters), slat conveyors requiring chain spacing beyond standard duplex pitch, and industrial drives where independent chain replacement without taking down the other strand is a maintenance priority. For the equivalent American (ANSI) version see our American double simplex sprockets<\/a>. Browse the categoria pignone completo<\/a>.<\/p>\n<\/div>\n

\"Korea<\/p>\n
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\ud83d\udccf SD vs Duplex \u2014 chain spacing comparison<\/p>\n

The SD (double simplex) hub allows any chain spacing up to BL dimension. Asian duplex chain fixes the spacing at the duplex inner width. For conveyor slat bars that fall between the standard duplex spacing options, SD is the only option:<\/p>\n\n\n\n\n\n
Type<\/th>\n40B<\/th>\n60B<\/th>\n80B<\/th>\n<\/tr>\n
SD BL max<\/td>\n35 mm<\/td>\n50 mm<\/td>\n60 mm<\/td>\n<\/tr>\n
Duplex fixed<\/td>\n14.38 mm<\/td>\n22.78 mm<\/td>\n29.29 mm<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

For slat bars wider than the duplex inner width, SD sprockets are the only solution.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

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Key:<\/strong> Z = teeth \u00a0|\u00a0 Do = tip diameter (mm) \u00a0|\u00a0 Dp = pitch circle diameter (mm) \u00a0|\u00a0 BD stock = pilot bore (mm) \u00a0|\u00a0 BD max = max bore (mm) \u00a0|\u00a0 BL = chain strand centre spacing (mm) \u00a0|\u00a0 C45 hardened teeth throughout<\/p>\n<\/div>\n

SD Sprocket Specifications \u2014 40SD & 60SD<\/h2>\n

40SD \u00a0|\u00a0 Pitch 12.70 mm \u00a0|\u00a0 Roller \u00d8 7.95 mm \u00a0|\u00a0 BL = 35 mm<\/h3>\n

\"Double<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n
Z<\/th>\nDo (mm)<\/th>\nDp (mm)<\/th>\nBD stock (mm)<\/th>\nBD max (mm)<\/th>\nBL (mm)<\/th>\n<\/tr>\n<\/thead>\n
12<\/td>\n55<\/td>\n49.07<\/td>\n10<\/td>\n34<\/td>\n35<\/td>\n<\/tr>\n
14<\/td>\n63<\/td>\n57.07<\/td>\n13<\/td>\n42<\/td>\n35<\/td>\n<\/tr>\n
16<\/td>\n74<\/td>\n65.10<\/td>\n13<\/td>\n50<\/td>\n35<\/td>\n<\/tr>\n
17<\/td>\n76<\/td>\n69.12<\/td>\n13<\/td>\n54<\/td>\n35<\/td>\n<\/tr>\n
19<\/td>\n84<\/td>\n77.16<\/td>\n13<\/td>\n63<\/td>\n35<\/td>\n<\/tr>\n
21<\/td>\n92<\/td>\n85.21<\/td>\n14<\/td>\n71<\/td>\n35<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

60SD \u00a0|\u00a0 Pitch 19.05 mm \u00a0|\u00a0 Roller \u00d8 11.91 mm \u00a0|\u00a0 BL = 50 mm<\/h3>\n
\n\n\n\n\n\n\n\n\n\n\n
Z<\/th>\nDo (mm)<\/th>\nDp (mm)<\/th>\nBD stock (mm)<\/th>\nBD max (mm)<\/th>\nBL (mm)<\/th>\n<\/tr>\n<\/thead>\n
12<\/td>\n83<\/td>\n73.60<\/td>\n14<\/td>\n51<\/td>\n50<\/td>\n<\/tr>\n
14<\/td>\n95<\/td>\n85.61<\/td>\n16<\/td>\n64<\/td>\n50<\/td>\n<\/tr>\n
16<\/td>\n107<\/td>\n97.65<\/td>\n16<\/td>\n76<\/td>\n50<\/td>\n<\/tr>\n
17<\/td>\n113<\/td>\n103.67<\/td>\n16<\/td>\n82<\/td>\n50<\/td>\n<\/tr>\n
19<\/td>\n126<\/td>\n115.74<\/td>\n16<\/td>\n94<\/td>\n50<\/td>\n<\/tr>\n
21<\/td>\n138<\/td>\n127.82<\/td>\n16<\/td>\n107<\/td>\n50<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

50SD (BL=40 mm) and 80SD (BL=60 mm) also available \u2014 contact us. Bore machined to any metric shaft size up to BD max, keyway to JIS B1301. Specify: type (40SD\/50SD\/60SD\/80SD), tooth count and bore diameter mm.<\/p>\n

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Technical Features & Applications<\/h2>\n

\"Double<\/p>\n

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Japanese Grain Handling Equipment<\/h3>\n

40SD and 60SD sprockets are the standard specification for wide-belt bucket elevator head shafts in Japanese rice mills, grain silos and feed processing plants. The two independent chain strands allow the elevator belt width to be set at any dimension within the BL range, and allow one strand to be replaced without fully dismantling the elevator. Widely exported to Southeast Asia, Australia and South Korea in Japanese agricultural plant.<\/p>\n<\/div>\n

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Korean Agricultural Machinery OEM<\/h3>\n

Korean combine harvesters and threshers use 40SD and 60SD sprockets for the threshing drum drive and straw conveyor shafts. The JIS B1801 chain standard is used throughout Korean agricultural OEM machinery. Korea Ever-Power 40SD and 60SD sprockets with bore machined to the OEM shaft diameter are the correct replacement for all Korean agricultural equipment chain drives.<\/p>\n<\/div>\n

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Single-Chucking Manufacture<\/h3>\n

Both tooth rows, the bore and the hub are machined in one CNC turning centre setup. This is the critical quality requirement for a double simplex sprocket \u2014 the two tooth rows must be perfectly co-axial for equal load sharing between the two chains. A sprocket manufactured in two separate chucking operations will have inter-row runout that causes one chain to carry a disproportionate share of the load.<\/p>\n<\/div>\n

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Hardened JIS B1801 Teeth<\/h3>\n

Both tooth rows are induction-hardened to 52\u201358 HRC. The tooth profile is machined to JIS B1801 before hardening; after hardening, tooth profile and bore dimensions are confirmed by dimensional inspection. Pair with JIS B1801 single-strand roller chain<\/a> (two rolls, same chain size as the SD designation \u2014 40B for 40SD, 60B for 60SD).<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

Catena abbinata e prodotti correlati<\/h2>\n
\"JIS<\/p>\n
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Two Rolls of JIS Asian Standard Chain<\/p>\n

Order two separate rolls of JIS B1801 single-strand roller chain in the matching size: 40B for 40SD, 60B for 60SD, 80B for 80SD. Both chains must be the same grade and worn to the same elongation for equal load sharing.<\/p>\n

View Driving Chains \u2192<\/a><\/p>\n<\/div>\n<\/div>\n

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\"Catene<\/p>\n

catene di foglie<\/a><\/h3>\n

Catene a maglie piatte serie BL e LH per montanti di carrelli elevatori, azionamenti per porte industriali e meccanismi di sollevamento. Portate di trazione da 11 kN a oltre 1.600 kN.<\/p>\n

Visualizza le catene di foglie<\/a><\/p>\n<\/div>\n

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\"Catene<\/p>\n

Catene ingegneristiche<\/a><\/h3>\n

Catene in acciaio saldato, ghisa e forgiate per il trasporto industriale pesante in acciaierie, cementifici, miniere e impianti chimici.<\/p>\n

Visualizza le catene ingegneristiche<\/a><\/p>\n<\/div>\n

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\"Catena<\/p>\n

Catene in acciaio inossidabile<\/a><\/h3>\n

Catene a rulli in acciaio inox SUS304 e SUS316L per ambienti alimentari, farmaceutici e chimici. Adatte a lavaggi frequenti, temperature elevate e agenti corrosivi.<\/p>\n

Visualizza catene in acciaio inox<\/a><\/p>\n<\/div>\n

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\"filiera<\/p>\n

Filiere agricole<\/a><\/h3>\n

Serie CA, CC e catene per mais per mietitrebbie, raccoglitrici di cotone, presse e spandiconcime. Conformi agli standard ISO 487 \/ ASME B29.100.<\/p>\n

Visualizza le filiere agricole<\/a><\/p>\n<\/div>\n<\/div>\n

<\/p>\n

\"\"<\/p>\n
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Request a Quote \u2014 Asian Double Simplex Sprockets<\/h3>\n

Specify type (40SD\/50SD\/60SD\/80SD), tooth count, bore diameter in mm and required chain spacing if different from standard BL. Response within one working day.<\/p>\n

Richiedi subito un preventivo<\/a>
\nTutti i prodotti Sprocket<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

Korea Ever-Power Asian standard double sprockets for two single chains (SD series) are designed to drive two parallel single-strand JIS B1801 chains simultaneously from one shaft. The hub carries two JIS tooth rows machined to the correct profile for the chain size, separated by the standard centre-to-centre spacing (BL dimension) for that chain size. Both chain rows are independent \u2014 separately tensioned, separately replaceable.<\/p>","protected":false},"featured_media":253,"comment_status":"open","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[24],"product_tag":[],"class_list":["post-262","product","type-product","status-publish","has-post-thumbnail","product_cat-sprockets","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/5speedtransmission.com\/it\/wp-json\/wp\/v2\/product\/262","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/5speedtransmission.com\/it\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/5speedtransmission.com\/it\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/5speedtransmission.com\/it\/wp-json\/wp\/v2\/comments?post=262"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/5speedtransmission.com\/it\/wp-json\/wp\/v2\/media\/253"}],"wp:attachment":[{"href":"https:\/\/5speedtransmission.com\/it\/wp-json\/wp\/v2\/media?parent=262"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/5speedtransmission.com\/it\/wp-json\/wp\/v2\/product_brand?post=262"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/5speedtransmission.com\/it\/wp-json\/wp\/v2\/product_cat?post=262"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/5speedtransmission.com\/it\/wp-json\/wp\/v2\/product_tag?post=262"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}