torque specs for flat head cap screws
Torque is only an indirect indication of tension.

Freefly Systems proprietary combination type fastener. Hexagon and Spline Socket Head Cap Screws shall be designated by the following data in the sequence shown: Nominal size (number, fractional or decimal equivalent); threads per inch; length (fractional or decimal equivalent); product name; material; and protective coating if required. Below are guides that show these calculations for a variety of materials, bolts sizes and thread counts over a range of frictional conditions. Button Head - Alloy Steel . Chamfering of screw sizes up to and including size 8 (0.164 in.) Threads shall be Unified external threads with radius root: Class 3A UNC and UNF Series for screw size 0 (0.060 in.)

to 1-1/2 in., inclusive: and Class 2A UNC Series for sizes larger than 1-1/2 in.

Drawings. 0000011397 00000 n CAUTION:  Care should be used when applying a formula for torque/tension relationships. 21. 0000004507 00000 n If the order received does not meet these requirements, it may result in a supplier corrective action request, which could jeopardize your status as an approved vendor. The portion of the screw contained within dimension L is commonly called the shank.

... Joint Torque Specifications. 0000016539 00000 n System of Measurement; Inch: Metric : Thread Size. 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. %PDF-1.4 Log in. Heads may be plain or knurled at the option of the manufacturer unless otherwise specified by the customer. DIN 931 / ISO 4014 Partially Threaded Hex Cap Screw, 10.9 Grade Bare Steel / Yellow Zinc Plated, 10.9 Grade Bare Steel with Extended Threads, DIN 933 / ISO 4017 Fully Threaded Hex Cap Screw, DIN 960 / ISO 8765 Partially Threaded Hex Cap Screw (Fine Thread), DIN 961 / ISO 8676 Fully Threaded Hex Cap Screw (Fine Thread), Japanese Industrial Standard (JIS) Hex Fasteners, JIS B1189-10.9 Small Head Hex Flange Zinc Plated, DIN 912 / ISO 4762 Socket Head Cap Screws, DIN 7991 / ISO 10642 Flat Head Countersunk Socket, DIN 911 / ISO 2936 Short Arm Chrome Vanadium, DIN 911 / ISO 2936 Long Arm Chrome Vanadium, DIN 125 / ISO 7089,7090 Bare Steel/Zinc Plated, DIN 125 / ISO 7089,7090 A2/A4 Stainless Steel, DIN 126 Bare Steel/Hot Dipped Galvanized (ISO FIT), DIN 1440 For Clevis Pins Bare Steel/Zinc Plated, DIN 6916HV-10 Structural Bare Steel/Yellow Zinc Plated, DIN 127B Spring Steel Bare Steel/Zinc Plated/Yellow Zinc Plated, DIN 127B Spring Steel Hot Dipped Galvanized, DIN 127B Alloy Steel Lock Washer Yellow Zinc Plated, DIN 7980 High Collar Bare Steel/Zinc Plated, DIN 6798V Serrated Countersunk Zinc Plated, NFE 25-511 Contact Washer Yellow Zinc Plated, DIN 2093 Disc Spring Carbon Steel/Chrome Vanadium, DIN 137B Crinkled Spring A2 Stainless Steel, DIN 934 Bare Steel/Zinc Plated/Hot Dip Galvanized, DIN 985 Nylon Insert Zinc Plated / Hot Dipped Galvanized (ISO FIT), DIN 963 Slotted Flat Countersunk A2 Stainless, DIN 965 Phillips Flat Countersunk A2 Stainless Steel, DIN 7985 Phillips Pan Head A2 Stainless Steel, DIN 975-8.8 Hot Dipped Galvanized (ISO FIT), ISO 529/DIN 374 HSS-G/HSS-E Metric Machine Taps, DIN 580 Lifting Eye Bolt A2 Stainless Steel, DIN 479-8.8 Square Head Set Screw Bare Steel, DIN 931-A2/A4 / ISO 4014 Hex Head Cap Screw Part Thread, DIN 933-A2/A4 / ISO 4017 Hex Head Cap Screw Full Thread, DIN 912-A2/A4 / ISO 4762 Socket Cap Screw, DIN 7991-A2/A4 / ISO 10642 Flat Head Countersunk Socket, DIN 125-A2/A4 / ISO 7089,7090 Flat Washer, DIN 965-A2 Phillips Flat Head Countersunk, DIN 975-A2 Threaded Rod (1 Meter) FINE Thread, DIN 933 / ISO 4017 Hex Cap Screw Fully Threaded, DIN 963 Slotted Flat Head Countersunk Machine Screw, Holo-Krome Grade 9 Inch Heavy Hex Cap Screws, Holo-Krome 12-Point Flange Screws – Imperial, Short Arm Hexagon Key CV Steel Black Finish, Long Arm Hexagon Key CV Steel Satin Finish, 1. Search Results. size screw, 1 7/8 inch long, LG=0.50 inch and LB =0.25 inch. The length of thread shall be measured, parallel to the axis of the screw, from the extreme point to the last complete (full form) thread. whichever is grated for sizes through 1/2 in and 3% (6 % total runout) for sizes above 1/2 in. Home » Technical Pages » Mechanical Properties » Torque Information. The following figures are general guidelines only. Diameters De and Ae shall be concentric with the axis of the thread. For all lengths of screws the form of the underhead fillet shall be optional, as depicted in Figure 1, provided it is a smooth and continuous concave curve fairing into the bearing surface of the head and the screw shank within the envelope established by the limits for fillet extension, length and juncture radius specified in Table 1A.


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