Fixaball UNF 1/4" Socket Screw Countersunk High Tensile 10.9 DIN7991

For flush-fitting fastening in UNF applications, this Fixaball countersunk socket screw features a 1/4" diameter with 28 T. P. I. fine pitch thread. Made in high tensile steel grade 10.9 with a self colour finish, it is tightened using an Allen or hex key drive and sits flush with the surface when fully installed.

Suitable for applications requiring a Unified National Fine thread, this countersunk screw is available in a choice of fully threaded and partially threaded lengths. Length is measured from the tip to the top on this countersunk pattern.

Available options

• 1/4"-28 x 3/8" (FT)
• 1/4"-28 x 1/2" (FT)
• 1/4"-28 x 5/8" (FT)
• 1/4"-28 x 3/4" (FT)
• 1/4"-28 x 7/8" (FT)
• 1/4"-28 x 1" (FT)
• 1/4"-28 x 1 1/4" (FT)
• 1/4"-28 x 1 1/2" (FT)
• 1/4"-28 x 1 3/4" (PT)
• 1/4"-28 x 2" (PT)
• 1/4"-28 x 2 1/2" (PT)
• 1/4"-28 x 3" (PT)

Key features

• 1/4" diameter
• 28 T. P. I. UNF fine pitch thread
• High tensile steel grade 10.9
• Self colour finish
• Allen / hex socket drive
• Countersunk head for flush fitting
• Conforms to ISO 10642, B18. 3, BS 2470

Sizing

• 1/4"-28 x 3/8"
• 1/4"-28 x 1/2"
• 1/4"-28 x 5/8"
• 1/4"-28 x 3/4"
• 1/4"-28 x 7/8"
• 1/4"-28 x 1"
• 1/4"-28 x 1 1/4"
• 1/4"-28 x 1 1/2"
• 1/4"-28 x 1 3/4"
• 1/4"-28 x 2"
• 1/4"-28 x 2 1/2"
• 1/4"-28 x 3"

Rackhams Reference : 3C172U33J6