Saipor 10pcs Magnetic Pentagon Head Screwdriver Bits Set 1/4 Inch Hex Shank Security Tamper Proof Pentagonal Drive Bit Five-Sided Figure Screw Driver Drill Bit for Electric Hand Screwdrivers, 50mm

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Recessed head fastener and driver combination". Google Patents. 2015-12-11. Archived from the original on 2020-01-26 . Retrieved 2017-10-13. Some screws have heads designed to accommodate more than one kind of driver, sometimes referred to as combo-head or combi-head. The most common of these are a combination of a slotted/Phillips head. Oberg, E. Jones, F. Horton, H. (1984). Machinery's Handbook, 22nd ed. New York: Industrial Press Inc. pp. 1157, 1159

Tork-Nuts". Loss Prevention Fasteners. Ultra Fasteners Inc. Archived from the original on 2015-09-26 . Retrieved 2015-09-25. The Slotted/Pozidriv is slightly different from the Slotted/Phillips (PH/S), and good use requires special screwdrivers. [ citation needed] ACR Phillips II Plus [ edit ] Tamper-resistant types [ edit ] A set of "secure" or otherwise less common screwdriver bits, including secure Torx and secure hex or "allen" variants. In addition to screw drives, various nut drives have been designed to make removal difficult without specialized tools. Proprietary examples include T-Groove, Slot-Lok, Pentagon, Tork-Nut, T-Slope and Spanner designs. [69] Breakaway head [ edit ] A Phillips screw head is slightly different from a PoziDriv; [10] see §Pozidriv section below for details.McMaster-Carr catalog (116thed.). p.2821. Archived from the original on 2019-12-14 . Retrieved 2011-09-26. Needs login Spline drives were specified for 5, 6.3, 8, 10, 12, 14, 16, and 20mm size screws. [82] Its primary advantage is its ability to resist cam out, so it is used in high-torque applications, such as tamper-proof lug nuts, cylinder head bolts, and other engine bolts. Quality product and a great, highly responsive, service from the team at SSP. I would definitely source from them again (Raham W) Line Head and Line Recess screw drives are Japanese systems with male, female and tamper-resistant configurations. [72]

This drive type has the disadvantage of not being as precisely controlled as can be obtained by proper use of a torque wrench; applications may still fail due to either too little torque being applied to correctly fasten the joint, or too much torque being required to shear the head, resulting in damage to the material being fastened. [ citation needed] Line Head and Line Recess [ edit ] Line head driver sizes [1] Internal a b Editors (April, May 1913). "Goodwin's Hollow Safety Set Screw" Hardware Dealers' Magazine. pp. 846 V, 865, 1090United States Maritime Service Institute. (1949). Engine Room Tools. New York: Mast Magazine Association. p. 25 Tamper Proof Nuts". Loss Prevention Fasteners. Ultra Fasteners Inc. Archived from the original on 2015-09-26 . Retrieved 2015-09-25. Repeated false alarms can cause many problems, whether it be loss of earnings, revenue or just loss of staff and pupil focus. They can put emergency responders and the public at greater risk attending a non emergency and even cause complacency and risk fatigue with staff, pupils and members of the public, meaning that they are less likely to respond in a real emergency situation. JIS B 1012-1985 ねじ用十字穴 Cross Recesses for Screws". Archived from the original on 2023-03-22 . Retrieved 2023-05-01. Adler, Alexander (1998-05-18). Testing and Understanding Screwdriver Bit Wear (Master's thesis). Virginia Tech. hdl: 10919/36701.