Square nut KBG · KBR

metalball returnfor ball screw

Overview
KBG · KBR Square single nut

Part Number Construction
Example: KBG 06 01 D X - 60 R 90 C3 Z - 001
① ② ③ ④ ⑤ ⑥ ⑦ ⑧ ⑨ ⑩ ⑪

Components

• ① Series: KBG = Square-type single nut (ground); KBR = Square-type single nut (rolled)
• ② Screw Diameter (mm): e.g. 06 = 6 mm
• ③ Lead (mm): 01 = standard ball lead, 1 mm; 01K = non-standard ball lead, 1 mm
• ④ Ball Return Type: D = Deflector Type; S = End Deflector Type; T = Return Tube Type; C = End-cap Type
• ⑤ Custom Option: non-standard options available (designation field)
• ⑥ Threaded Section Length (mm): decimal point indicated by "_"
• ⑦ Thread Direction: R = Right-hand; L = Left-hand; LR = Right- & Left-hand
• ⑧ Total Screw Length (mm): decimal point indicated by "_"
• ⑨ Accuracy Grade: C3 = JIS Standard C3; C5 = JIS Standard C5; C7 = JIS Standard C7; C10 = JIS Standard C10
• ⑩ Axial Clearance: Z = Preload; T = ≤ 0.005 mm; S = ≤ 0.02 mm; N = ≤ 0.05 mm
• ⑪ Custom Serial Number

Mechanical Dimension
Dimensional drawing provided for KBG / KBR square single nut (referenced on product page).

Square Single Nut Dimension Table
Screw Diameter D (mm / inch) | Lead (mm / inch) | Nut Overall Length L (mm / inch) | Nut Width E (mm / inch) | Nut Height G (mm / inch) | Mounting Hole Size B1 (mm / inch) | Mounting Hole Pitch B (mm / inch) | Mounting Hole Size A1 (mm / inch) | Mounting Hole Pitch A (mm / inch) | Tapped Hole M / Depth | Basic Dynamic Load Rating Ca (N) | Basic Static Load Rating Coa (N)
6 (0.236) | 1 (0.039) | 20 (0.787) | 13 (0.512) | 11 (0.433) | 2.5 (0.098) | 8 (0.315) | 2.5 (0.098) | 15 (0.591) | M3 / Depth 3.5 | 680 | 1200
8 (0.315) | 1 (0.039) | 20 (0.787) | 14 (0.551) | 13 (0.512) | 3 (0.118) | 8 (0.315) | 2.5 (0.098) | 15 (0.591) | M2.5x0.45 / Depth 3 | 780 | 1650
8 (0.315) | 1 (0.039) | 22 (0.866) | 15 (0.591) | 13 (0.512) | 1.5 (0.059) | 12 (0.472) | 2.5 (0.098) | 17 (0.669) | M2.5x0.45 / Depth 3 | 780 | 1650

Characteristics / Technical specifications

• Product family: Square Single Nut for ball-screw systems
• Series: KBG (square-type single nut, ground) and KBR (square-type single nut, rolled)
• Available screw diameters and leads: example shown for 6 mm (lead 1 mm) and 8 mm (lead 1 mm); both standard and non-standard leads (e.g. 01K)
• Ball return types: Deflector (D), End Deflector (S), Return Tube (T), End-cap (C)
• Threaded section length and total screw length: decimal indicated by "_" in part number
• Thread direction options: Right-hand (R), Left-hand (L), Combined (LR)
• Accuracy grades (JIS): C3, C5, C7, C10
• Axial clearance / preload options: Z (preload), T ≤ 0.005 mm, S ≤ 0.02 mm, N ≤ 0.05 mm
• Mechanical dimensions (examples): for D=6 mm, L=20 mm, E=13 mm, G=11 mm; mounting hole B1=2.5 mm, B pitch=8 mm, A1=2.5 mm, A pitch=15 mm; tapped hole M3 / depth 3.5 mm
• Load ratings (examples): for D=6 mm Ca (dynamic) = 680 N, Coa (static) = 1200 N; for D=8 mm Ca = 780 N, Coa = 1650 N
• Dimensional drawing and mechanical dimension diagram available on the product page