Flat Head UNC Screws – The Comprehensive Range for Every Application
Flat head UNC screws are the first choice for flush and visually appealing connections in the American standard. With a special 82° countersunk angle (as opposed to 90° for metric screws), they can be fully recessed into the material, ensuring a perfectly flat surface without protruding heads. This is not only a crucial advantage for aesthetics and aerodynamics but also minimizes the risk of injury and protects against snagging in dynamic applications.
Our range covers all common surface finishes and materials:
Stainless Steel (Inox): Offers maximum corrosion resistance, ideal for outdoor use, marine environments, and the food industry.
Zinc-Plated Steel: The zinc plating provides reliable protection against corrosion and gives the screw a shiny, decorative surface.
Plain Steel (unfinished): For industrial applications where the surface will be further processed after assembly (e.g., painting).
We offer these high-quality flat head screws with a variety of drives:
Hex Socket: For high torque transmission and a classic, secure fit.
Torx: The Torx profile enables optimal power transmission and minimizes the risk of cam-out, which is particularly beneficial for high-torque applications.
Phillips: The universal standard for quick and easy assembly, widely used in industry and crafts.
Slotted: The classic drive for traditional applications and restorations.
The versatile applications of these screws make them an indispensable range:
Vehicles & Motorcycles: Specifically for US cars, vintage cars, and American motorcycles that are manufactured to inch standards.
Industry & Mechanical Engineering: Suitable for US machinery and equipment where UNC threads are standard.
Agricultural Machinery & Road Construction: Robust connections for heavy-duty outdoor use.
Trax & Archery: For special fixings on off-road vehicles, trailers, and precision sports equipment.
Benefit from the long-standing experience of equipe bachofner gmbH and our extensive stock. Visit our online shop at www.zoll-schrauben.ch and find the right flat head UNC screw for your project.
Countersunk Screw 10-24UNC-7/8mm Stainless Steel
Countersunk Screw No. 10-24 UNC 1", nickel-plated, Allen key
Countersunk Screw 3/8"- 16 UNC x 3/4", Inbus
Countersunk Screw 6-32" UNC x 7/16" Torx, fits to Hoyt Cam, Elite Archery Cam
Countersunk Screw 8-32UNC x 7/16" Torx, fits to Hoyt Cam, Elite Archery Cam
Flat Head Socket Cap Screw, No. 4-40 UNC x 1/4", Zinc Plated
Thread & Dimensional Data
Feature Specification
Thread Standard UNC (Unified Coarse) per ASME B1.1
Thread Size No. 4-40 UNC
Threads per Inch 40 TPI
Major Diameter (max.) 0.1120 in (2.84 mm)
Head Style 82° Flat Countersunk Head
Drive Type Hex Socket (Internal Hexagon / Inbus)
Hex Key Size 1/16 in (1.59 mm)
Nominal Length (under head) 1/4 in = 6.35 mm
Overall Length (incl. head) Approx. 0.310 in (7.87 mm) – varies with head diameter and countersink geometry
Material & Finishing
Feature Specification
Hardness 39 – 44 HRC
Surface Finish Zinc plated (galvanized), clear/blue trivalent passivation
Environmental Compliance RoHS compliant (Directive 2011/65/EU)
Standard Reference
ASME B18.3-2003 – Socket Cap, Shoulder, and Set Screws (Inch Series)
Application
For mounting / securing the leather finger tab on the Elite AAE Finger Tab archery equipment.
Availability
Available from: www.zoll-schrauben.ch
Countersunk Screw No. 4-40 UNC 1/2", nickel-plated, Allen key
Countersunk Screw No. 4-40 UNC 3/4", nickel-plated, Allen key
Countersunk Screw No. 6-32 UNC 1/4", nickel-plated, Allen key
Countersunk Screw No. 6-32 UNC 3/8", nickel-plated, Allen key
Countersunk Screw No. 6-32 UNC 1/2", nickel-plated, Allen key
Countersunk Screw No. 6-32 UNC 3/4", nickel-plated, Allen key
Countersunk Screw No. 8-32 UNC 3/8", nickel-plated, Allen key
Countersunk Screw No. 8-32 UNC 1/2", nickel-plated, Allen key
Countersunk Screw No. 8-32 UNC 5/8", nickel-plated, Allen key
Countersunk Screw No. 8-32 UNC 3/8", nickel-plated, Allen key
Countersunk Screw No. 8-32 UNC 1", nickel-plated, Allen key
