Square nut KBG · KBR

metricfor ball screw

Product
KBG · KBR Square Single Nut — square-type single nut for ball screw systems, available in ground (KBG) and rolled (KBR) forms, standard 1 mm lead.

Part Number Construction
Example: KBG 06 01 D X - 60 R 90 C3 Z - 001

• 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) — optional/custom code position
• ⑥ Threaded Section Length (mm): decimal point is indicated by "_"
• ⑦ Thread Direction: R = Right-hand; L = Left-hand; LR = Right- & Left-hand
• ⑧ Total Screw Length (mm): decimal point is 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 / 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 Z | 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

Notes
The dimensional drawing and mechanical illustrations are provided for reference; the drawing shows mounting hole sizes, pitches, tapped hole details and overall nut geometry — verify dimensions on the drawing before assembly.

Characteristics / Technical specifications

• Series: KBG (square-type single nut, ground), KBR (square-type single nut, rolled)
• Screw diameters available on this page: 6 mm, 8 mm
• Lead options shown: 1 mm (standard and non-standard code 01K)
• Ball return types: D (Deflector), S (End Deflector), T (Return Tube), C (End-cap)
• Thread direction options: R (Right-hand), L (Left-hand), LR (Right- & Left-hand)
• Total screw length and threaded section length: decimal point indicated by "_" in part number
• Accuracy grades: C3, C5, C7, C10 (JIS standards)
• Axial clearance / preload options: Z = Preload; T ≤ 0.005 mm; S ≤ 0.02 mm; N ≤ 0.05 mm
• Dimension examples — D = 6 mm: L = 20 mm; E = 13 mm; G = 11 mm; B1 = 2.5 mm; B = 8 mm; A1 = 2.5 mm; A = 15 mm; Tapped hole = M3 / Depth 3.5; Ca = 680 N; Coa = 1200 N
• Dimension examples — D = 8 mm (variant 1): L = 20 mm; E = 14 mm; G = 13 mm; B1 = 3 mm; B = 8 mm; A1 = 2.5 mm; A = 15 mm; Tapped hole = M2.5x0.45 / Depth 3; Ca = 780 N; Coa = 1650 N
• Dimension examples — D = 8 mm (variant 2): L = 22 mm; E = 15 mm; G = 13 mm; B1 = 1.5 mm; B = 12 mm; A1 = 2.5 mm; A = 17 mm; Tapped hole = M2.5x0.45 / Depth 3; Ca = 780 N; Coa = 1650 N
• Refer to the product drawing for mounting and assembly details; custom options available on request