Metric countersunk hole dimensions pdf

The basic length dimension on the product shall be the nominal length expressed as a twoplace decimal. The organization of the book is designed to make it easy for the user to find his information in whatever module he is working. Using fewer socket screws of the same size can achieve the same clamping force in the joint. Metric socket countersunk head screws din 7991 bs 4168 iso 10642 materials and finishes steel 10. Specification for bolts and reference standards minimum ultimate tensile loads of hexagon socket countersunk head screws thread tolerance 6g for property class 8. These screws are usually fully threaded with machine threads and blunt point. They can be driven using a hex wrench or insert bit. Flat, countersunk head cap screws and button head cap screws are designed.

Countersunk hole an overview sciencedirect topics cap dimensions fastener handout fastener handout cap dimensions. Stock size chart socket countersunk head machine screws are made to din standard 7991 and host a hexagonal recess. Metric clearance hole chart for metric bolts and screws according to asme b18. Inch series flat socket head cap screws continued mechanical properties and tightening torques nominal size basic screw diameter tensile strength pounds min. Metric counterbore hole size chart a pictures of hole 2018. Metric machine screws are designed for metal to metal applications requiring a predrilled hole and a mating metric nut for the screw to thread into. Countersunk flat socket head cap screws, socket head cap. Thr ead lengt b diameter of unthreaded shank ds hex socket width across corners. Metric thread specifications always begin with thread series designation for example m or mj, followed by the fasteners nominal diameter and thread pitch both in units of millimeters separated by the symbol x.

Guide only dimensions may vary dependant on manufacturer. All data is correct to the best of our knowledge, however tr cannot be held responsible for any errors or omissions. Counterbored holes dimensions metric carbide depot. Placement of all text to be read from the bottom of the drawing is called unidirectional dimensioning. Metrics in engineering metric fasteners screws, nuts. Hexagon socket countersunk head screws en iso 10642 din 7991 grade 10. The countersunk hole is needed for an iso metric m6 csunk fastener. Metric countersunk hole dimensions chart a pictures of. The countersunk head is typically used in conjunction with a countersunk hole providing a. M12 x 18mm countersunk head hexagon socket drive screw. Metric din 963 slotted flat countersunk head machine screws. Iso metric machine screws are limited to four different head shapes.

Fastenerdata metric coarse socket countersunk screw grade8. Drill and counterbore sizes for socket head cap screws per. Iso metric profile external bolt thread internal nut thread basic mm size mm thread designation simple thread designation pitch mm class major dia. Metric threads throughhole preparation drill and counterbore sizes hardnesstensile conversion chart. Iso metric socket countersunk head screws dimensions in table 18. Metric din 963 are slotted drive flat countersunk head machine screws.

Drill and counterbore sizes for socket head cap s per. Use them size for size and there are fewer holes to drill and tap and fewer screws to buy and handle. The size most commonly associated with screw threads is the nominal diameter. A joint requiring twelve 8 grade 5 hex heads would need only 7 unbrako socket head cap screws. Metric thread extended thread size range iso thread height male thread h3 thread height female thread h1 sorted by thread class click here to return to the thread data chart page index. The 90 degree angle is normally assumed to be exact. Metric countersunk head machine screws slotted farnell. The hole punched in the sheet metal is designed to leave a minimum. The dimensional data in each case is presented for the various products, followed by the application data. Max min max min max min max min ref ref ref max min. Metric countersunk head machine screws slotted din 963 bs 4183 iso 2009 materialsfinishes.

All head dimensions are directly related to the basic screw diameter as follows. Selftapping screws metric pan heads metric phillips pan heads forselftappingscrews iso 7049 nominal diameter thread pitch ah k m g phillips driver size distance from underside of head to 1st major diam of thread head diameter head height recess diameter recess penetration max max min max min ref max min st 2. Nonstock items may vary due to variables in methods of manufacture. Metric socket flat head cap screws dimensions notes 1. Covid19 fastenright is open for business for all fastener and fixing enquiries. Generally our preferred stock is to din if dimensions are critical to your application you should check with us prior to ordering. Figure f shows a method of giving all dimensions from a common datum. Head dimensions slot dimensions recess dimensions protusion above gaging diameter gaging diameter. If such holes are not countersunk, the heads of screws may not seat properly or the sharp edges on holes may deform the fillets on screws thereby making them susceptible to fatigue in applications involving dynamic loading. Step bolts and countersunk head elevator bolts 39 nuts finished and heavy hex nuts 41 hexagon machine screw nuts 42 type a forged wing nuts 43 hex slotted nuts 44 hex and heavy hex jam nuts 45 to 46 hex castle nuts 47 large diameter hexagon head cap nuts 48 round spanner nuts 49 heavy hex nuts with tommy bar holes 410.

The standard metric fastener thread series for general purpose. This will prevent burr formation on the bottom side of the sheet metal. Austenitic steel is by far the most common type 90% of commercial fasteners. M12 x 18mm countersunk head hexagon socket drive screw in grade 10.

I believe the countersink diameter needs to be equal to the mmc diameter of the screw head across sharps plus the positional tolerance diameter of the hole. Jan 17, 2019 metric countersunk hole dimensions chart. Aligned dimensions have text placed parallel to the dimension line with vertical dimensions read from the. The driving of this screw with a hex wrench or insert bit makes these screws more efficient. Counterbored holes dimensions metric metric sockethead cap screws. Printed copies of electroimpact standards are for reference only and are not subject to revision. Socket countersunk head machine screws to din 7991 have a hexagonal recess and is driven using a hex wrench or insert bit. Din 933 1987 this standard contains specifications for fully threaded hexagon head screws with coarse metric thread for diameters m 1. Nominal size and thread diameter d ad i am et r d k tr ni a max. The basic requirement for countersunk head screws is that the head should fit into a countersunk hole with as great a degree of flushness as possible. Standard practices reading direction all dimension and note text must be oriented to be read from the bottom of the drawing relative to the drawing format. M5 x 100mm countersunk head hexagon socket drive screw. Socket head cap screws, countersunk flat socket head cap screws.

M5 x 100mm countersunk head hexagon socket drive screw in grade 10. Un0104 flat csk socket head cap screws property class 10. I could then place a hole knowing that when my drilled plate is placed in an assembly, the hole will match my fastener exactly without having to manually type in csink anglesdiameters etc. Include the diameter of the counterbore, which is based upon. Countersunk socket head screw button head socket screw flange button head socket screw. The length of the screw is the distance measured on a line parallel to the axis, from the plane of the bearing surface under the head to the plane of the flat of the point. Metric socket countersunk head screws elektronik lavpris. The purpose of producing them with a strength of the property class 10. Dimensions of slotted flat countersunk head machine screws nominal size or basic screw diameter l a h j t f g these lengths or. Dimensioning and tolerancing the college of new jersey.

Insert the key into the socket and apply the torque on the nut while holding the key. Iso 10642 hexagon socket countersunk head cap screws dimensions, specifications, standard, weights, equivalent and download pdf. The maximum or design size of the head is controlled by a theoretical diameter to a sharp corner and the minimum head angle of 90. In e, the holes are located from two baselines, or datums. Din 7991 iso 10642 flat head countersunk socket cap screw. Din 7991 iso 10642 flat head countersunk socket cap. Metric threads are defined in the standards document iso 9651. Thread forms metric, metricfine, unf, unc, bsw, bsf, ba. The countersink center will be coaxial with the hole.

Nominal size a h j t m r n f g phillips driver size. Metric din 97 slotted flat countersunk head wood screws. Iso 10642 dimensions, specifications, standard, weights. Performance data listed are for standard production items only. Socket head countersunk screws iso 10642 din 7991 a countersunk headed screw conforming with iso 10642 or din 7991, requiring a hex key otherwise known as an allen key to. Creating a countersunk hole for iso metric fasteners.

Hexagon socket countersunk head screw07407 hexagon socket countersunk head screw51060 m24x180 10 07400. Basic countersunk bolt dimensions hr csk bolts size d m12 m16 m20 m22 m24 m27 m30 m36 pitch 1. Des, mied, in manual of engineering drawing fourth edition, 2012. Iso metric hexagon socket screws are limited to two different head shapes. Apr 28, 2019 metric counterbore hole size chart april 28, 2019 countersunk hole an overview sciencedirect topics cap dimensions fastener handout fastener handout cap dimensions. To achieve this it is necessary for both the head of the screw and the countersunk hole to be controlled within prescribed limits. Counterbored hole dimensions for metric socket head cap screws. Flat head countersunk socket cap screws din 7991 are not intended for high strength application. Metric countersunk hole dimensions chart a pictures of hole. It is considered good practice to countersink or break the edges of holes that are smaller than f max. Hexagon socket countersunk head screws dinstock ltd.