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One Way Screw

One Way Screws are tamper resistant screws, also known as tamper proof screws, that require no special driver to install, just a bladed screwdriver, but do require a special driver to remove. One Way screws are typically available in Round and Oval heads in both steel and stainless steel. Typical sizes are listed below though Apex Fasteners can supply parts in nearly any size to meet your particular application's needs. One Way drives can also be found on certain barrell nuts and "shoulder screws". Please see our One Way Screw Removal Tools for removal assistance.

One Way Tamper Resistant Machine Screws
Round Head Machine Screw
 Oval Head Machine Screw
Round_Head_Machine_Screw.png Oval_Head_Machine_Screw.png

All Measurements in Inches.

Basic Part Number Size Length Removal
Driver
TR04C0025OW 4-40 1/4 TLHDOW01
TR04C0037OW 4-40 3/8 TLHDOW01
TR04C0050OW 4-40 1/2 TLHDOW01
TR04C0075OW 4-40 3/4 TLHDOW01
TR04C0100OW 4-40 1 TLHDOW01
TR06C0025OW 6-32 1/4 TLHDOW01
TR06C0037OW 6-32 3/8 TLHDOW01
TR06C0050OW 6-32 1/2 TLHDOW01
TR06C0075OW 6-32 3/4 TLHDOW01
TR06C0100OW 6-32 1 TLHDOW01
TR06C0150OW 6-32 1 1/2 TLHDOW01
TR08C0037OW 8-32 3/8 TLHDOW01
TR08C0050OW 8-32 1/2 TLHDOW01
TR08C0062OW 8-32 5/8 TLHDOW01
TR08C0075OW 8-32 3/4 TLHDOW01
TR08C0100OW 8-32 1 TLHDOW01
TR08C0150OW 8-32 1 1/2 TLHDOW01
TR08C0200OW 8-32 2 TLHDOW01
TR10C0037OW 10-24 3/8 TLHDOW02
TR10C0050OW 10-24 1/2 TLHDOW02
TR10C0075OW 10-24 3/4 TLHDOW02
TR10C0100OW 10-24 1 TLHDOW02
TR10C0125OW 10-24 1 1/4 TLHDOW02
TR10C0150OW 10-24 1 1/2 TLHDOW02
TR10C0200OW 10-24 2 TLHDOW02
TR10F0037OW 10-32 3/8 TLHDOW02
TR10F0050OW 10-32 1/2 TLHDOW02
TR10F0062OW 10-32 5/8 TLHDOW02
TR10F0075OW 10-32 3/4 TLHDOW02
TR10F0100OW 10-32 1 TLHDOW02
TR10F0125OW 10-32 1 1/4 TLHDOW02
TR10F0150OW 10-32 1 1/2 TLHDOW02
TR10F0200OW 10-32 2 TLHDOW02
TR12C0050OW 12-24 1/2 TLHDOW03
TR12C0075OW 12-24 3/4 TLHDOW03
TR12C0100OW 12-24 1 TLHDOW03
TR12C0150OW 12-24 1 1/2 TLHDOW03
TR25C0037OW 1/4-20 3/8 TLHDOW03
TR25C0050OW 1/4-20 1/2 TLHDOW03
TR25C0075OW 1/4-20 3/4 TLHDOW03
TR25C0100OW 1/4-20 1 TLHDOW03
TR25C0125OW 1/4-20 1 1/4 TLHDOW03
TR25C0150OW 1/4-20 1 1/2 TLHDOW03
TR25C0200OW 1/4-20 2 TLHDOW03
TR25C0250OW 1/4-20 2 1/2 TLHDOW03
TR25C0300OW 1/4-20 3 TLHDOW03
TR31C0050OW 5/16-18 1/2 TLHDOW03
TR31C0075OW 5/16-18 3/4 TLHDOW03
TR31C0100OW 5/16-18 1 TLHDOW03
TR31C0150OW 5/16-18 1 1/2 TLHDOW03
TR31C0200OW 5/16-18 2 TLHDOW03

Part Number Example:
(Basic Part Number-Material Code-Finish Code)
TR06C0075OWOSS
6-32 x 3/4" One Way Oval Head Machine Screw, Stainless Steel

Head Types
Round R
Oval
 O

Materials
Steel Alloy
 SP
Steel Zinc
 SZ
Stainless Steel SS
Steel Black Oxide
 SB


One Way Tamper Resistant Sheet Metal Screws
Round Head Sheet Metal Screw
 Oval Head Sheet Metal Screw
One_Way_Round_Head_Sheet.png One_Way_Oval_Head_Sheet.png

All Measurements in Inches.

Basic Part Number Size Length Removal
Driver
TR04X050OW #4 1/2 TLHDOW01
TR04X075OW #4 3/4 TLHDOW01
TR04X100OW #4 1 TLHDOW01
TR06X037OW #6 3/8 TLHDOW01
TR06X050OW #6 1/2 TLHDOW01
TR06X062OW #6 5/8 TLHDOW01
TR06X075OW #6 3/4 TLHDOW01
TR06X100OW #6 1 TLHDOW01
TR06X137OW #6 1 3/8 TLHDOW01
TR06X150OW #6 1 1/2 TLHDOW01
TR08X037OW #8 3/8 TLHDOW01
TR08X050OW #8 1/2 TLHDOW01
TR08X062OW #8 5/8 TLHDOW01
TR08X075OW #8 3/4 TLHDOW01
TR08X100OW #8 1 TLHDOW01
TR08X125OW #8 1 1/4 TLHDOW01
TR08X150OW #8 1 1/2 TLHDOW01
TR08X200OW #8 2 TLHDOW01
TR08X250OW #8 2 1/2 TLHDOW01
TR10X050OW #10 1/2 TLHDOW02
TR10X075OW #10 3/4 TLHDOW02
TR10X100OW #10 1 TLHDOW02
TR10X125OW #10 1 1/4 TLHDOW02
TR10X150OW #10 1 1/2 TLHDOW02
TR10X200OW #10 2 TLHDOW02
TR10X250OW #10 2 1/2 TLHDOW02
TR12X050OW #12 1/2 TLHDOW03
TR12X075OW #12 3/4 TLHDOW03
TR12X100OW #12 1 TLHDOW03
TR12X150OW #12 1 1/2 TLHDOW03
TR14X050OW #14 1/2 TLHDOW03
TR14X075OW #14 3/4 TLHDOW03
TR14X100OW #14 1 TLHDOW03
TR14X125OW #14 1 1/4 TLHDOW03
TR14X150OW #14 1 1/2 TLHDOW03
TR14X200OW #14 2 TLHDOW03
TR14X250OW #14 2 1/2 TLHDOW03
TR14X300OW #14 3 TLHDOW03

Part Number Example:
(Basic Part Number-Material Code-Finish Code)
TR04X050OWRSP
#4 x 1/2" One Way Round Head Sheet Metal Screw, Steel Alloy

Head Types
Round R
Oval
 O

Materials
Steel Alloy
 SP
Steel Zinc
 SZ
Stainless Steel SS
Steel Black Oxide
 SB


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APEX FASTENERS, Inc - 15858 Business Center Drive - Irwindale, CA 91706 USA
APEX Fasteners supplies standard and custom screws, nut retainers, shoulder screws, plastites and taptites, all types of rivets, spring steel fasteners and special stampings, sems screws in standard, fractional or metric to electronics, aviation and other OEM industries worldwide. ApexFasteners.com custom manufactures screw machine components for electronic enclosure hardware as well as cold forming and cold headed specials for assembly and production requirements.
Tel: (626) 962-2219 - info@apexfasteners.com
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