hexagon socket head cap screw dimensions

UNF Socket Cap Screw 1936 Grade-12.9 BS2470.

for screw sizes No. Head Diameter. The edge between the top of the head and the chamfer may be slightly rounded.5. Drilled head metric hexagon socket head cap screws normally are not available in screw sizes smaller than M3 nor larger than M36. - The diameter range of socket head cap screws is from 0.06 inch to 4 inches according to When so specified by the purchaser, the edges of holes on the outside surface of the head will be chamfered 45 degrees to a depth of 0.30 to 0.50 mm.American National Standard Socket Head Cap Screws & Metric Series per.

The portion of the screw contained within dimension L is commonly called the shank. bs 2470.

See examples below: 6-32 x 3/4 Hexagon Socket Head Cap Screw, Alloy Steel .138 – 32 x .75 Spline Socket Head Cap Screws, Alloy Steel, Cadmium Plated.1.

Griping Gaging Length, LG.

Heads may be plain or knurled at the option of the manufacturer unless otherwise specified by the customer. FA solutions.

1. For screws of nominal length above the heavy line in Table 1B the complete (full form) threads measured with a thread ring gage, having the thread chamfer and/or counterbore removed, shall extend to within two pitches (threads) of the head for sizes 0 (0.060 in.)

Socket Head Cap Screw Imperial UNF - Heat Treated Black ASME/ANSI B18.3 1960 Series.

They shall be measured from the bearing surface of the head to the face of a GO thread ring gage, having the thread countersink and /or counterbore removed, which has been assembled by hand as far as the thread will permit. The plane of the bearing surface shall be perpendicular to the axis of the screw within a maximum deviation of 1 degree.b. (3% total runout) or 0.005 in.

See Table 7 for spline socket dimensions, and Appendix 1 for gaging of spline sockets.21. etc., screw sizes are shown in the following chart according to ASME B18.3-2003 standard.Socket head cap screw is a 2020. Body Length, LB. The M3 and M4 nominal screw sizes have two drilled holes spaced 180 degrees apart. Body. The length of the screw shall be measured parallel to the axis of the screw from the plane of the bearing surface under the head to the plane of the flat of the point.
New Products introduced : Hexalobular Socket Head Cap Screw with Extra Low Head (Inch Thread) Mar. For alloy steel screws of up to and including 5/8 in., and nominal lengths equal to or less than 8 times the basic screw diameter, the surface roughness of the screws before plating shall not exceed 63 microinches (arithmetical average) on the fillet and head bearing surfaces, nor exceed 32 microinches (arithmetical average) on the threads.For larger sizes, longer lengths, and corrosion resistant steel screws, the surface roughness of the screws prior to plating shall not exceed 125 micro-inches (arithmetical average) on the body (see Note 2), fillet (see Note 8) and head bearing surfaces.Normally, it shall be sufficient to ascertain that these surfaces on screws have the equivalent of a smooth machined finish by visual comparison with know surface standards. UN. : Class 2A UNC and UNF Series for sizes over 1 in. Socket Head Cap Screws Inch Socket Head Cap Screws. Class 3A does not provide a plating allowance.

The head shall be chamfered. Screw Point Chamfer.

Length Tolerances. See examples below: 6-32 x 3/4 Hexagon Socket Head Cap Screw, Alloy Steel .138 – 32 x .75 Spline Socket Head Cap Screws, Alloy Steel, Cadmium Plated. Thread Length, LT. Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.2. For knurled screws the maximum head diameter shall be measured across the tops of the knurl and the minimum head diameter shall be the diameter of the un-knurled portion, or the diameter across the tops of the knurl for those screws not having an un-knurled portion, just above the radius or chamfer at the bottom edge of the head.4. The socket shall be concentric with the shank within 1-1/2% of the basic screw diameter, D maximum.

Total runout between thread, body and head: Screws shall assemble into a compound hole which is threaded at one end to the basic thread size (3B minimum), for a length equivalent to 1-1/2 D, counterbored at the other end to diameter Ae listed in Table 1C, and whose center portion is equal to De. See Note 4 for LT values.4.
- Alloy steel cap screws shall conform to ASTM A547 and stainless steel cap screws shall conform to ASTM F837. Nominal screw sizes M5 and larger have six drilled holes spaced 60 degrees apart unless the purchaser specifies two drilled holes.

- Thread shall conform to Unified external threads with radius root: Class 3A UNRC and UNRF

However, where it is practical and deemed necessary to measure these surfaces with commercially available equipment, roughness measurements shall be taken axially on the body and fillet surfaces, and circumferentially on the bearing surface.19. Threads.

Some important notes from the ASME B18.3: - The diameter range of socket head cap screws is …

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