Thrust screw BSx-SUS

clampingfasteningthumb

Product description
Ball socket (thumb) screws with either a round or flat ball at the contact end. The flat ball is suited to support soft workpieces, apply clamping force or support at an angle. The ball rotates in the socket as load is applied, maintaining contact on moving or contoured surfaces. Screws are machined from heat‑treated 304 stainless steel; balls are stainless steel heat‑treated to Rockwell Rc59–66.

Product types

• BSx — Steel body and ball
• BSx-SUS — Stainless body and ball (this page)

Available parts (examples)

• BSR4X10-SUS — Type A — Ball Ø 2.5 mm — Thread M4×0.70 — D: - — L: 10.5 mm — L1: 0.8 mm — K: 2.0 mm
• BSF4X10-SUS — Type B — Ball Ø 2.5 mm — Thread M4×0.70 — D: 2.0 mm — L: 10.0 mm — L1: 0.3 mm — K: 2.0 mm
• BSR4X16-SUS — Type A — Ball Ø 2.5 mm — Thread M4×0.70 — D: - — L: 16.5 mm — L1: 0.8 mm — K: 2.0 mm
• BSF4X16-SUS — Type B — Ball Ø 2.5 mm — Thread M4×0.70 — D: 2.0 mm — L: 16.0 mm — L1: 0.3 mm — K: 2.0 mm
• BSR4X6-SUS — Type A — Ball Ø 2.5 mm — Thread M4×0.70 — D: - — L: 6.5 mm — L1: 0.8 mm — K: 2.0 mm
• BSF4X6-SUS — Type B — Ball Ø 2.5 mm — Thread M4×0.70 — D: 2.0 mm — L: 6.0 mm — L1: 0.3 mm — K: 2.0 mm
• BSR5X12-SUS — Type A — Ball Ø 3.0 mm — Thread M5×0.80 — D: - — L: 12.6 mm — L1: 1.0 mm — K: 2.5 mm
• BSF5X12-SUS — Type B — Ball Ø 3.0 mm — Thread M5×0.80 — D: 2.5 mm — L: 12.0 mm — L1: 0.4 mm — K: 2.5 mm
• BSR5X20-SUS — Type A — Ball Ø 3.0 mm — Thread M5×0.80 — D: - — L: 20.6 mm — L1: 1.0 mm — K: 2.5 mm
• BSF5X20-SUS — Type B — Ball Ø 3.0 mm — Thread M5×0.80 — D: 2.5 mm — L: 20.0 mm — L1: 0.4 mm — K: 2.5 mm

Media
Specifications available as PDF (product specification sheet).

Technical specifications

• Product type: Ball socket / thumb screws with round or flat ball contact end.
• Styles: Round (BSR...) and Flat (BSF...).
• Series on this page: BSx-SUS (stainless steel body and ball).
• Screw material: Heat‑treated 304 stainless steel.
• Ball material: Stainless steel, heat‑treated to Rockwell Rc59–66.
• Typical ball diameters: 2.5 mm and 3.0 mm.
• Available thread sizes: M4×0.70 and M5×0.80.
• Example overall lengths (L) shown: 6, 6.5, 10, 10.5, 12, 12.6, 16, 16.5, 20, 20.6 mm.
• Contact projection (L1) examples: 0.3 mm, 0.4 mm, 0.8 mm, 1.0 mm.
• Head dimension (K) examples: 2.0 mm, 2.5 mm.
• Function: Flat style for supporting soft workpieces, applying clamping force or angled support; ball socket allows rotational compliance to maintain contact on moving or contoured surfaces.