1/4-20 x 4 inch UNC Cap Head Screws (ANSI B18.3) - Black Stainless Steel (A2)


Key Features

  • 1 Year Extended Warranty.
  • Free Technical Support From Our Engineers.
  • Custom Dimensions Available Through Our Custom Manufacture Service.
  • Thread Size (T): 1/4-20 UNC
  • Length (L): 4 inch
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1/4-20 x 4 inch UNC Cap Head Screws (ANSI B18.3) - Black Stainless Steel (A2) Technical Specification

1/4-20 x 4 inch UNC Cap Head Screws (ANSI B18.3) - Black Stainless Steel (A2) Drawing
FinishMatte Black
Fully ThreadedNo
General Tolerances+/- 0.13mm
Head Diameter (D)0.375 inch
Head Length (H)0.25 inch
Hexagon A/F (J)3/16 inch
Hexagon Depth (P)0.12 inch
Length (L)4 inch
Manufacturing StandardANSI B18.3
MaterialStainless Steel (A2)
Material SpecificationStainless Steel (A2)
Screw Thread Pitch20 TPI
Thread Length (Max)1 - 1.5 inch
Thread Size (T)1/4-20 UNC

Product Certifications

Certificate of Conformity Included
Certificate of Conformity Included
RoHS Certified
RoHS Certified
REACH Certified
REACH Certified
Quality Approved

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1/4-20 x 4 inch UNC Cap Head Screws (ANSI B18.3) - Black Stainless Steel (A2) Description

The 1/4-20 x 4 inch UNC Cap Head Screws (ANSI B18.3) - Black Stainless Steel (A2) has the following features:

  • 1/4-20 UNC Thread Size (T)
  • 0.25 inch Head Length (H)
  • 0.12 inch Hexagon Depth (P)
  • ANSI B18.3 Manufacturing Standard
  • 4 inch Length (L)
  • 3/16 inch Hexagon A/F (J)
  • +/- 0.13mm General Tolerances
  • No Fully Threaded
  • Stainless Steel (A2) Material
  • Stainless Steel (A2) Material Specification
  • 20 TPI Screw Thread Pitch
  • Matte Black Finish
  • 0.375 inch Head Diameter (D)
  • 1 - 1.5 inch Thread Length (Max)

Discover more about the Imperial Socket Cap Head Screws range.

Imperial Socket Cap Head Screws feature a large, cylindrical head and hexagonal socket drive, which makes them suitable for use with Accu's range of Allen Keys or Socket Drive Bits. Imperial Socket Cap Head Screws are the imperial equivalent to Accu's standard range of Metric Cap Head Screws.

Imperial Cap Screw Sizes

This range of Cap Screws is available in imperial thread sizes of between No. 0 and 3/4 inch. Lengths range from 3/32 inch to 12 inch, with partially threaded and fully threaded screws available depending on screw size.

Cap Screw Materials

Our range of Imperial Socket Cap Head Screws is available in A2 and Marine Grades of Stainless Steel as standard. Other material options include Bumax Stainless Steel and PEEK. Additional finishes such as AccuBlack Chemical Blackening and AccuLock Thread Locking Patches are available for Stainless Steel Cap Screws.

Shipping Information

Shipping Destinations:Worldwide.
View delivery information.
Weight: 0.02kg.

Component History

Product First Available:Sunday, June 28, 2015
Stock Last Updated:06:44 pm
Thursday, January 27, 2022
Specification Last Updated:Thursday, January 27, 2022

APC / Barcodes

APC (Accu Product Code):SSC-1/4-20-4-A2-BL
EAN13 (International Article No.):5054328961739
ASIN (Amazon Stock Identification No.):ASIN not defined.