STAINLESS STEEL PHILLIPS COUNTERSUNK B SELF TAPPING SCREWS DIN 7982FH

Phillips Countersunk B Self Tapping Screws DIN 7982FH — This is the B-pointed, pre-drilled-hole counterpart to DIN 7982CH, sharing the same countersunk head and Phillips recess but swapping the self-starting AB tip for a blunter point and finer thread pitch designed to form a clean thread in a pre-drilled or pierced hole rather than punch its own way into solid sheet. That makes it the more reliable choice in thicker gauge steel, diecast housings, or plastics and GRP, where a sharp AB point risks splitting or crazing the material instead of cutting a controlled thread. The Phillips recess carries over unchanged — plain tapered flanks with no radial tangs, built to cam out at a set driving torque, which suits automated production well but is less forgiving than the tanged Pozidriv recess under sustained hand-tool torque. Typical uses lean toward components where the hole is already formed as part of fabrication: pre-punched electrical enclosures, pre-drilled brackets, and diecast or moulded parts needing a flush countersunk fixing. As throughout the range, A2 stainless covers general indoor and moderate external use, while A4 is worth the added cost for coastal, marine, or washdown environments, where sustained chloride exposure would otherwise corrode a lower grade over the life of the assembly. DIN 7982 sets the countersunk head's cone angle and thread form; the FH suffix marks the blunter form F point paired with a Phillips (H) recess, distinct from the sharper form C (AB) point in DIN 7982CH. Pilot hole diameter is the critical sizing variable for this screw — get it right and the thread forms cleanly with good engagement; oversize it and the joint loses holding power regardless of screw quality; undersize it and the screw becomes hard to drive or risks snapping, particularly in harder base materials or diecast alloys.

FAQs
Why is pilot hole diameter so critical for this screw?
Get it right and the thread forms cleanly with good engagement; oversize it and the joint loses holding power, undersize it and the screw becomes hard to drive or risks snapping.

Is this screw suitable for diecast or moulded plastic parts?
Yes, the blunter B point is generally the safer choice than a sharp AB point in these materials when driven into a correctly sized pilot hole.

Are these available in A4 stainless for washdown environments?
Yes, A4 (316-equivalent) is worth specifying where sustained chloride exposure would otherwise corrode a lower grade over the assembly's service life.

Does the Phillips recess resist cam-out as well as Pozidriv?
No, it's designed to cam out at a set torque rather than resist it, which suits automated driving but is less forgiving than Pozidriv under sustained hand-tool torque.