{"title":"Slotted screw","description":null,"products":[{"product_id":"sparskruv-med-stort-huvud-a1-din-921","title":"Slotted screw with pan head | Large head | A1 | DIN 921","description":"\u003cp\u003e\u003cstrong\u003eSlotted flat head screw in stainless steel A1\u003c\/strong\u003e (AISI 303 \/ 1.4305) according to DIN 921 features an extra-large, low head with a straight slot and is intended for mechanical fastening where a large contact surface is required. The wide head distributes the load over a larger area against the fastened component.\u003c\/p\u003e\n\u003cp\u003eThe large screw head provides a wide contact surface and, in some applications, may reduce the need for a separate plain washer. This design is particularly useful when the load needs to be distributed over a larger area or when a smaller screw head does not provide sufficient contact area.\u003c\/p\u003e\n\u003ch2\u003eSAME PRODUCT FAMILY: SLOTTED FLAT HEAD SCREW\u003c\/h2\u003e\n\u003cp\u003eDIN 921 and DIN 923 are two versions of the same product family, slotted flat head screw (German: Flachkopfschraube mit Schlitz). DIN 921 has an extra-large head for a large contact surface. DIN 923, on the other hand, has an unthreaded shoulder under the head (shoulder screw). If you need a slotted screw with a shoulder, see \u003ca href=\"\/en\/products\/sparskruv-med-krage-a1-din-923\"\u003eSlotted flat head screw | With shoulder | A1 | DIN 923\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eAREA OF APPLICATION\u003c\/h2\u003e\n\u003cp\u003eDIN 921 is used for mechanical fastenings where a large and low screw head is suitable. The large contact surface can be advantageous when fastening components where the load needs to be distributed over a larger area. Stainless steel A1 provides corrosion resistance for environments and applications where this material grade is suitable.\u003c\/p\u003e\n\u003ch2\u003eTECHNICAL SPECIFICATIONS\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eProduct type:\u003c\/strong\u003e Screw\u003cbr\u003e\u003cstrong\u003eProduct family:\u003c\/strong\u003e Slotted flat head screw (DIN 921 \/ DIN 923)\u003cbr\u003e\u003cstrong\u003eAlso known as:\u003c\/strong\u003e Slotted screw, slotted machine screw, slotted flat head screw\u003cbr\u003e\u003cstrong\u003eHead shape:\u003c\/strong\u003e Flat head, large head\u003cbr\u003e\u003cstrong\u003eMaterial grade:\u003c\/strong\u003e A1 (AISI 303 \/ 1.4305)\u003cbr\u003e\u003cstrong\u003eStandard:\u003c\/strong\u003e DIN 921\u003cbr\u003e\u003cstrong\u003eThread type:\u003c\/strong\u003e Metric thread\u003cbr\u003e\u003cstrong\u003eDrive type:\u003c\/strong\u003e Slotted\u003cbr\u003e\u003cstrong\u003eDelivery unit:\u003c\/strong\u003e Piece\u003c\/p\u003e\n\u003ch2\u003eFREQUENTLY ASKED QUESTIONS (FAQ)\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is DIN 921?\u003c\/strong\u003e\u003cbr\u003eDIN 921 is a standard for slotted screws with a flat, large head. The wide head provides a large contact surface against the fastened component and distinguishes this version from slotted screws with smaller heads.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between DIN 921 and DIN 923?\u003c\/strong\u003e\u003cbr\u003eBoth are slotted flat head screws and belong to the same product family. DIN 921 has an extra-large head for a large contact surface. DIN 923 has an unthreaded shoulder under the head and is used when a smooth surface for guidance or centering is required. See \u003ca href=\"\/en\/products\/sparskruv-med-krage-a1-din-923\"\u003eslotted shoulder screw DIN 923\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs a washer required for DIN 921?\u003c\/strong\u003e\u003cbr\u003eNot always. The large head itself provides a wide contact surface and may therefore reduce the need for a separate plain washer in some applications. A washer may still be required depending on the surface, load, and the requirements of the construction.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy does DIN 921 have a large head?\u003c\/strong\u003e\u003cbr\u003eThe large head increases the contact surface against the fastened part, allowing the load to be distributed over a larger area. This can be beneficial when fastening against materials or components where a smaller contact area is unsuitable.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat thread type does DIN 921 have?\u003c\/strong\u003e\u003cbr\u003eDIN 921 has a metric thread and is used together with a corresponding metric internal thread or suitable nut.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does stainless steel A1 mean?\u003c\/strong\u003e\u003cbr\u003eA1 is a material grade for stainless steel (austenitic, corresponding to 1.4305 \/ AISI 303). The choice of A1 should be made based on the specific environment and the corrosion resistance requirements applicable to the installation.\u003c\/p\u003e","brand":"WASI","offers":[{"title":"M3 \/ 5","offer_id":55300164550998,"sku":"104058","price":3.1,"currency_code":"SEK","in_stock":false},{"title":"M3 \/ 6","offer_id":55300164583766,"sku":"104059","price":2.9,"currency_code":"SEK","in_stock":false},{"title":"M3 \/ 8","offer_id":55300164616534,"sku":"104060","price":3.2,"currency_code":"SEK","in_stock":false},{"title":"M3 \/ 12","offer_id":55300164682070,"sku":"104061","price":6.6,"currency_code":"SEK","in_stock":true},{"title":"M4 \/ 5","offer_id":55300164845910,"sku":"104062","price":4.2,"currency_code":"SEK","in_stock":false},{"title":"M4 \/ 6","offer_id":55300164878678,"sku":"104063","price":4.25,"currency_code":"SEK","in_stock":false},{"title":"M4 \/ 8","offer_id":55300164911446,"sku":"104064","price":4.5,"currency_code":"SEK","in_stock":false},{"title":"M4 \/ 10","offer_id":55300164944214,"sku":"104065","price":5.0,"currency_code":"SEK","in_stock":false},{"title":"M4 \/ 12","offer_id":55300164976982,"sku":"104066","price":6.5,"currency_code":"SEK","in_stock":false},{"title":"M5 \/ 6","offer_id":55300165173590,"sku":"104067","price":6.25,"currency_code":"SEK","in_stock":false},{"title":"M5 \/ 8","offer_id":55300165206358,"sku":"104068","price":7.3,"currency_code":"SEK","in_stock":false},{"title":"M5 \/ 10","offer_id":55300165239126,"sku":"104069","price":9.0,"currency_code":"SEK","in_stock":false},{"title":"M5 \/ 12","offer_id":55300165271894,"sku":"104070","price":10.5,"currency_code":"SEK","in_stock":false},{"title":"M5 \/ 16","offer_id":55300165304662,"sku":"104071","price":10.6,"currency_code":"SEK","in_stock":false},{"title":"M6 \/ 10","offer_id":55300165534038,"sku":"104072","price":9.9,"currency_code":"SEK","in_stock":false},{"title":"M6 \/ 12","offer_id":55300165566806,"sku":"104073","price":10.6,"currency_code":"SEK","in_stock":false},{"title":"M6 \/ 16","offer_id":55300165599574,"sku":"104074","price":11.0,"currency_code":"SEK","in_stock":false},{"title":"M6 \/ 30","offer_id":55300165697878,"sku":"104075","price":15.0,"currency_code":"SEK","in_stock":false},{"title":"M8 \/ 20","offer_id":55300165927254,"sku":"104076","price":19.0,"currency_code":"SEK","in_stock":false},{"title":"M8 \/ 30","offer_id":55300165992790,"sku":"104077","price":37.0,"currency_code":"SEK","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0776\/7864\/1494\/files\/rostfri-nu-din-921-slotted-screw.jpg?v=1789067451"},{"product_id":"sparskruv-med-krage-a1-din-923","title":"Slotted pan head screw | With shoulder | A1 | DIN 923","description":"\u003cp\u003e\u003cstrong\u003eSlotted fillister head screw with shoulder in stainless steel A1\u003c\/strong\u003e (AISI 303 \/ 1.4305) according to DIN 923, also known as a shoulder screw, features an unthreaded shoulder under the head and is intended for mechanical assemblies where a smooth, cylindrical surface is required for guiding or centering. The threaded end provides firm attachment into the load-bearing structure.\u003c\/p\u003e\n\u003cp\u003eDIN 921 and DIN 923 are two versions of the same product family, slotted fillister head screws (German: Flachkopfschraube mit Schlitz). DIN 923 has an unthreaded shoulder under the head. DIN 921 instead features an extra-large head for a wide contact surface. If you need a slotted screw with a large head, see \u003ca href=\"\/en\/products\/sparskruv-med-stort-huvud-a1-din-921\"\u003eSlotted fillister head screw | Large head | A1 | DIN 921\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eAREA OF APPLICATION\u003c\/h2\u003e\n\u003cp\u003eThe product is used in machine building, device construction, and other mechanical contexts where a screw requires an unthreaded shoulder for guiding or centering an adjacent component. The smooth surface of the shoulder provides a defined contact, while the threaded part allows for firm attachment into the load-bearing structure.\u003c\/p\u003e\n\u003ch2\u003eTECHNICAL SPECIFICATIONS\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eProduct type:\u003c\/strong\u003e Screw\u003cbr\u003e\u003cstrong\u003eProduct family:\u003c\/strong\u003e Slotted fillister head screw (DIN 921 \/ DIN 923)\u003cbr\u003e\u003cstrong\u003eAlso known as:\u003c\/strong\u003e Slotted shoulder screw, shoulder screw, slotted machine screw\u003cbr\u003e\u003cstrong\u003eHead shape:\u003c\/strong\u003e Fillister head\u003cbr\u003e\u003cstrong\u003eMaterial grade:\u003c\/strong\u003e A1 (AISI 303 \/ 1.4305)\u003cbr\u003e\u003cstrong\u003eStandard:\u003c\/strong\u003e DIN 923\u003cbr\u003e\u003cstrong\u003eThread type:\u003c\/strong\u003e Metric thread\u003cbr\u003e\u003cstrong\u003eDrive type:\u003c\/strong\u003e Slotted\u003cbr\u003e\u003cstrong\u003eDesign:\u003c\/strong\u003e Unthreaded shoulder under the head\u003cbr\u003e\u003cstrong\u003eSales unit:\u003c\/strong\u003e Piece\u003c\/p\u003e\n\u003ch2\u003eFREQUENTLY ASKED QUESTIONS (FAQ)\u003c\/h2\u003e\n\u003ch3\u003eWhat is a slotted shoulder screw (DIN 923)?\u003c\/h3\u003e\n\u003cp\u003eIt is a slotted fillister head screw with an unthreaded shoulder between the head and the threaded part. The shoulder provides a smooth cylindrical surface that can be used for guiding or centering, while the threaded end secures the screw into a load-bearing part.\u003c\/p\u003e\n\u003ch3\u003eWhat is the difference between DIN 923 and DIN 921?\u003c\/h3\u003e\n\u003cp\u003eBoth are slotted fillister head screws belonging to the same product family. DIN 923 has an unthreaded shoulder under the head. DIN 921 has an extra-large head that provides a wide contact surface. See \u003ca href=\"\/en\/products\/sparskruv-med-stort-huvud-a1-din-921\"\u003eslotted fillister head screw with large head DIN 921\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eWhen is a shoulder screw used instead of a standard machine screw?\u003c\/h3\u003e\n\u003cp\u003eWhen the assembly requires a smooth, unthreaded surface for guiding or centering, such as against a lever, linkage arm, or bushing, rather than just a threaded fastening point.\u003c\/p\u003e\n\u003ch3\u003eHow do I choose the right length?\u003c\/h3\u003e\n\u003cp\u003eThe length is specified as the total screw length from the underside of the head to the tip. The length of the shoulder follows the standard per thread size (see dimension drawing), and the remaining part closest to the tip is threaded. Choose a length that provides sufficient thread engagement in the load-bearing part.\u003c\/p\u003e\n\u003ch3\u003eWhat does stainless steel A1 mean?\u003c\/h3\u003e\n\u003cp\u003eA1 is an austenitic stainless steel grade (equivalent to 1.4305 \/ AISI 303) used primarily for screws and other turned\/machined parts. It has good general corrosion resistance but is not as resistant to chlorides and salt environments as A4 (acid-proof). The choice of A1 should be based on the actual environment and the corrosion resistance requirements for the installation – for marine use or severe chemical exposure, A4 is recommended instead.\u003c\/p\u003e","brand":"WASI","offers":[{"title":"M3 \/ 3","offer_id":55381084832086,"sku":"104600","price":3.6,"currency_code":"SEK","in_stock":false},{"title":"M3 \/ 4","offer_id":55381084864854,"sku":"104601","price":2.9,"currency_code":"SEK","in_stock":false},{"title":"M3 \/ 5","offer_id":55381084897622,"sku":"104602","price":3.3,"currency_code":"SEK","in_stock":false},{"title":"M3 \/ 6","offer_id":55381084930390,"sku":"104603","price":3.4,"currency_code":"SEK","in_stock":false},{"title":"M3 \/ 8","offer_id":55381084963158,"sku":"104604","price":3.5,"currency_code":"SEK","in_stock":false},{"title":"M3 \/ 10","offer_id":55381084995926,"sku":"104605","price":3.7,"currency_code":"SEK","in_stock":true},{"title":"M4 \/ 3","offer_id":55381085028694,"sku":"104606","price":3.6,"currency_code":"SEK","in_stock":false},{"title":"M4 \/ 4","offer_id":55381085061462,"sku":"104607","price":4.7,"currency_code":"SEK","in_stock":false},{"title":"M4 \/ 5","offer_id":55381085094230,"sku":"104608","price":5.0,"currency_code":"SEK","in_stock":false},{"title":"M4 \/ 6","offer_id":55381085126998,"sku":"104609","price":4.4,"currency_code":"SEK","in_stock":false},{"title":"M4 \/ 8","offer_id":55381085159766,"sku":"104610","price":4.2,"currency_code":"SEK","in_stock":false},{"title":"M5 \/ 3","offer_id":55381085192534,"sku":"104611","price":4.5,"currency_code":"SEK","in_stock":false},{"title":"M5 \/ 4","offer_id":55381085225302,"sku":"104612","price":4.8,"currency_code":"SEK","in_stock":false},{"title":"M5 \/ 5","offer_id":55381085258070,"sku":"104613","price":5.1,"currency_code":"SEK","in_stock":false},{"title":"M5 \/ 6","offer_id":55381085290838,"sku":"104614","price":8.3,"currency_code":"SEK","in_stock":false},{"title":"M5 \/ 8","offer_id":55381085323606,"sku":"104615","price":6.2,"currency_code":"SEK","in_stock":false},{"title":"M5 \/ 10","offer_id":55381085356374,"sku":"104616","price":6.5,"currency_code":"SEK","in_stock":false},{"title":"M5 \/ 12","offer_id":55381085389142,"sku":"104617","price":5.9,"currency_code":"SEK","in_stock":false},{"title":"M5 \/ 16","offer_id":55381085421910,"sku":"104618","price":8.3,"currency_code":"SEK","in_stock":false},{"title":"M6 \/ 3","offer_id":55381085454678,"sku":"104619","price":7.1,"currency_code":"SEK","in_stock":false},{"title":"M6 \/ 4","offer_id":55381085487446,"sku":"104620","price":9.7,"currency_code":"SEK","in_stock":false},{"title":"M6 \/ 5","offer_id":55381085520214,"sku":"104621","price":8.2,"currency_code":"SEK","in_stock":false},{"title":"M6 \/ 6","offer_id":55381085552982,"sku":"104622","price":8.8,"currency_code":"SEK","in_stock":false},{"title":"M6 \/ 8","offer_id":55381085585750,"sku":"104623","price":12.4,"currency_code":"SEK","in_stock":false},{"title":"M6 \/ 10","offer_id":55381085618518,"sku":"104624","price":10.1,"currency_code":"SEK","in_stock":false},{"title":"M6 \/ 12","offer_id":55381085651286,"sku":"104625","price":9.3,"currency_code":"SEK","in_stock":false},{"title":"M6 \/ 16","offer_id":55381085684054,"sku":"104626","price":9.5,"currency_code":"SEK","in_stock":false},{"title":"M6 \/ 20","offer_id":55381085716822,"sku":"104627","price":10.3,"currency_code":"SEK","in_stock":false},{"title":"M8 \/ 6","offer_id":55381085749590,"sku":"104628","price":12.4,"currency_code":"SEK","in_stock":false},{"title":"M8 \/ 8","offer_id":55381085782358,"sku":"104629","price":11.5,"currency_code":"SEK","in_stock":false},{"title":"M8 \/ 10","offer_id":55381085815126,"sku":"104630","price":14.9,"currency_code":"SEK","in_stock":false},{"title":"M8 \/ 12","offer_id":55381085847894,"sku":"104631","price":14.0,"currency_code":"SEK","in_stock":false},{"title":"M8 \/ 16","offer_id":55381085880662,"sku":"104632","price":18.6,"currency_code":"SEK","in_stock":false},{"title":"M8 \/ 20","offer_id":55381085913430,"sku":"104633","price":19.8,"currency_code":"SEK","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0776\/7864\/1494\/files\/rostfri-nu-din-923-slotted-collar-screw-technical-drawing.jpg?v=1790272460"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0776\/7864\/1494\/collections\/rostfri-nu-din-921-slotted-screw.jpg?v=1790248871","url":"https:\/\/rostfri.nu\/en\/collections\/sparskruv.oembed","provider":"Rostfri.nu","version":"1.0","type":"link"}