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 No. 10-24 UNC 1-1/4", nickel-plated, Allen key
Countersunk Screw No. 10-24 UNC 1-1/2", nickel-plated, Allen key
Countersunk Screw 3/8"- 16 UNC x 7/8", Allen Key
Countersunk screw 6-32UNC x 1/4" internal hexagon
6-32 UNC x 1/2" Countersunk Screw
Countersunk screw 3/8" - 16 UNC x 1"
3/8" - 16 x 1" Countersunk Screw with Hex Socket UNC Length 25.40 mm
American Coarse Thread UNC
16 Threads per inch
ASME/ANSI B 18.3-2002
Countersunk Head 82°
Hardness RC 39-44
Class FIT 3A
Similar to DIN 7991
Length including head 1 inch = 25.40 mm
Thread diameter 9.53 mm
Wrench size 7/32"
Inch Countersunk Screw 10 - 24 UNC x 3/8 Inch (9.52mm)
Hex socket UNC, length 38.10 mm, stainless steel A2American coarse thread UNC20 threads per inchStainless steel A2, 18.8Length with head 1 1/2 inches = 38.10 mmThread diameter 6.35 mmWrench size 5/32 inch
Countersunk Head Screw 1/4"- 20UNC x 2" A2 (50.8 mm)
7/16"-20 x 2" Countersunk Screw (UNF) Overall length with head: 2" = 50.80 mm Hex socket size: 1/4" Hardness: RC 39 -44 Class fit: 3A Similar in design to DIN 7991
Countersunk screw No. 8-32" UNC x 7/16" Allen key 18.3 burnished, fits to Hoyt Cam, Elite Archery Cam
Countersunk screw 1/4"-20 UNCx3/8" Inbus
Countersunk screw 1/4"-20 UNCx1/2" Inbus
Countersunk screw 1/4"-20 UNC x 5/8" Inbus
Countersunk screw 1/4"-20 UNCx3/4" Inbus
Countersunk screw 1/4" - 20 UNC x 7/8"
1/4" - 20 x 7/8" countersunk screw with internal hexagon drive, UNC, length 22.23 mm
American coarse thread UNC
20 threads per inch
ASME/ANSI B 18.3-2002
Countersunk head 82°
Hardness RC 39 - 44
Class FIT 3A
similar to DIN 7991
Length including head 7/8" = 22.23 mm
Thread diameter 6.35 mm
Wrench size 5/32"
Countersunk screw 1/4"-20 UNC x 1" Inbus
Countersunk screw 1/4"-20 UNC x 1" Inbus
Countersunk screw 1/4"-20 UNCx1-1/4" Inbus
Countersunk screw 1/4"-20 UNC x 1-3/4" Inbus
