#8 x 1-5/8 flat head assembly screw is a Wurth screw designed for general fastening where a flat seating surface is needed, so the head sits flush in countersunk holes for a cleaner, more secure assembly in woodworking and related fastening jobs. The screw uses a combo drive that accepts #2 Square Drive bits for primary installation, giving positive bit engagement that helps the screw drive straight into the material. The same screw also works with #2 Phillips Drive bits for after market adjustment, so existing installations can be snugged or removed using common drivers on site or in the shop. It has a sharp point with coarse thread, which is suited to driving directly into material where a fast bite and strong hold are needed. The screw is lubricated, supporting smoother driving under load.
This Wurth #8 x 1-5/8 flat head assembly screw uses #2 Square Drive bits to insert, so the driver bit fits positively in the recess to transmit torque efficiently through the driving phase. The same screw can be turned with #2 Phillips Drive bits for after market adjustment, allowing later tightening or removal using widely available Phillips drivers on site. This length in the line is threaded two thirds from the bottom of the screw, so clamping force concentrates through the lower portion of the shank as it pulls the joint together. The sharp point and coarse thread style work together so the screw advances steadily into the material.
This Wurth #8 x 1-5/8 flat head assembly screw is part of a screw line described for 3/4 inch and 1 inch lengths as threaded fully, while all other sizes are threaded two thirds from the bottom, placing this length in the partially threaded group. That thread layout focuses clamping force through the lower section, which helps pull components tightly together as the unthreaded upper shank slides in the clearance material. The sharp point lets the screw start into material without a blunt lead, helping it find its path as it begins to cut threads. With a flat head intended to sit into a countersink, the screw provides a seating surface that brings faces together while keeping the head out of the way of adjacent components in an assembly.
The combo drive arrangement on this flat head assembly screw uses #2 Square Drive bits to insert, which lets installers use a square drive bit for firm engagement while driving at higher torque. The ability to also use #2 Phillips Drive bits for after market adjustment means the same installed screw can be revisited using commonly carried Phillips drivers in the field or shop, which supports later tuning, removal, or replacement without changing the original fastener. The screw is case hardened, so the surface of the head and threads is hardened to resist wear at the drive recess and along the thread flanks as it cuts into material. That hardening works with the lubricated surface to reduce friction as the coarse thread advances, helping torque go into drawing the joint tight rather than overcoming resistance in the threads.
This Wurth #8 x 1-5/8 flat head assembly screw uses #2 Square Drive bits to insert, providing firm bit engagement during driving, and also accepts #2 Phillips Drive bits for after market adjustment when tightening or removing later.
This #8 x 1-5/8 screw belongs to the sizes threaded two thirds from the bottom, so only the lower portion carries threads, helping the joint pull tight as the unthreaded shank passes through the top material.
This Wurth assembly screw is case hardened, giving the outer surface extra hardness so the drive recess and threads better resist wear under torque during driving and later adjustments.
The sharp point on this coarse thread screw lets it start into the material effectively, so the threads bite quickly and the screw advances with controlled pressure as it cuts its own path.
This screw is lubricated, which reduces friction between the threads and material so driving torque is used to tighten the joint, assisting smoother installation under sustained fastening work.
The flat head on this screw is intended to sit in a countersunk recess, creating a flush bearing surface that pulls components together while leaving the head level with the surrounding material.
The Wurth #8 x 1-5/8 flat head assembly screw combines a sharp point, coarse thread, and lubricated, case hardened body to support effective driving and joint clamping. The combo drive works with both #2 Square and #2 Phillips bits, fitting common shop and site drivers. The two-thirds thread from the bottom focuses pull through the joint while allowing the upper shank to align the workpieces. For projects that match this size and thread layout, this screw provides a defined driving feel and flat head seating in countersunk applications.
Sold In: 4000 Each
