• THK BNK0401-3 Finished-Shaft Ball Screw (Shaft 4 mm, Lead 1 mm)
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THK BNK0401-3 Finished-Shaft Ball Screw (Shaft 4 mm, Lead 1 mm)

THK BNK0401-3 Finished-Shaft Ball Screw (Shaft 4 mm, Lead 1 mm)

THK BNK0401-3 precision ball screw with standardized, finished shaft ends ready to mount in THK support units (shaft 4 mm, lead 1 mm).

Key features

  • Screw shaft ends pre-machined to fit THK EK/FK/BK and EF/FF/BF support units
  • Compact nut and shaft for space-saving, high-accuracy feed units
  • Every standard stroke/length/accuracy combination is a ready-to-order full model number
  • Accuracy grades C3/C5/C7 with matching axial clearance (G0, GT, G2) as printed
  • Fixed-supported mounting (BNK0401/0501/0601: fixed-free) in-line with motor

Specifications

Series BNK (finished shaft end, standard stock)
Shaft diameter 4 mm
Lead 1 mm
Seal None (seal-less nut)
Shaft end Finished for THK support units (code suffix Y)
Support units EK4/FK4
Stainless option Add suffix M to the model number
Source THK General Catalog Ball Screw (Korean ed. 515-2K), p. A15-122-123, A15-120-121
BNK0401-3G0+77LC3Y Stroke: 20 mm | Shaft length: 77 mm | Accuracy: C3 | Clearance: G0 (0 or less, preloaded) | Load rating: Ca 0.29 / C0a 0.42 kN
BNK0401-3GT+77LC3Y Stroke: 20 mm | Shaft length: 77 mm | Accuracy: C3 | Clearance: GT (0.005 mm or less) | Load rating: Ca 0.29 / C0a 0.42 kN
BNK0401-3G0+77LC5Y Stroke: 20 mm | Shaft length: 77 mm | Accuracy: C5 | Clearance: G0 (0 or less, preloaded) | Load rating: Ca 0.29 / C0a 0.42 kN
BNK0401-3GT+77LC5Y Stroke: 20 mm | Shaft length: 77 mm | Accuracy: C5 | Clearance: GT (0.005 mm or less) | Load rating: Ca 0.29 / C0a 0.42 kN
BNK0401-3G2+77LC7Y Stroke: 20 mm | Shaft length: 77 mm | Accuracy: C7 | Clearance: G2 (0.02 mm or less) | Load rating: Ca 0.29 / C0a 0.42 kN
BNK0401-3G0+97LC3Y Stroke: 40 mm | Shaft length: 97 mm | Accuracy: C3 | Clearance: G0 (0 or less, preloaded) | Load rating: Ca 0.29 / C0a 0.42 kN
BNK0401-3GT+97LC3Y Stroke: 40 mm | Shaft length: 97 mm | Accuracy: C3 | Clearance: GT (0.005 mm or less) | Load rating: Ca 0.29 / C0a 0.42 kN
BNK0401-3G0+97LC5Y Stroke: 40 mm | Shaft length: 97 mm | Accuracy: C5 | Clearance: G0 (0 or less, preloaded) | Load rating: Ca 0.29 / C0a 0.42 kN
BNK0401-3GT+97LC5Y Stroke: 40 mm | Shaft length: 97 mm | Accuracy: C5 | Clearance: GT (0.005 mm or less) | Load rating: Ca 0.29 / C0a 0.42 kN
BNK0401-3G2+97LC7Y Stroke: 40 mm | Shaft length: 97 mm | Accuracy: C7 | Clearance: G2 (0.02 mm or less) | Load rating: Ca 0.29 / C0a 0.42 kN
BNK0401-3G0+127LC3Y Stroke: 70 mm | Shaft length: 127 mm | Accuracy: C3 | Clearance: G0 (0 or less, preloaded) | Load rating: Ca 0.29 / C0a 0.42 kN
BNK0401-3GT+127LC3Y Stroke: 70 mm | Shaft length: 127 mm | Accuracy: C3 | Clearance: GT (0.005 mm or less) | Load rating: Ca 0.29 / C0a 0.42 kN
BNK0401-3G0+127LC5Y Stroke: 70 mm | Shaft length: 127 mm | Accuracy: C5 | Clearance: G0 (0 or less, preloaded) | Load rating: Ca 0.29 / C0a 0.42 kN
BNK0401-3GT+127LC5Y Stroke: 70 mm | Shaft length: 127 mm | Accuracy: C5 | Clearance: GT (0.005 mm or less) | Load rating: Ca 0.29 / C0a 0.42 kN
BNK0401-3G2+127LC7Y Stroke: 70 mm | Shaft length: 127 mm | Accuracy: C7 | Clearance: G2 (0.02 mm or less) | Load rating: Ca 0.29 / C0a 0.42 kN
Ball ScrewsTHK
15 product codes available in this family
Sourced direct from KoreaExport-ready supplyCompetitive pricing
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THK BNK0401-3 Finished-Shaft Ball Screw (Shaft 4 mm, Lead 1 mm)

Brand THK·Ball Screws

Available part numbers (15)

BNK0401-3G0+77LC3Y, BNK0401-3GT+77LC3Y, BNK0401-3G0+77LC5Y, BNK0401-3GT+77LC5Y, BNK0401-3G2+77LC7Y, BNK0401-3G0+97LC3Y, BNK0401-3GT+97LC3Y, BNK0401-3G0+97LC5Y, BNK0401-3GT+97LC5Y, BNK0401-3G2+97LC7Y + 5 more — see full table ↓

How to order

Send the THK part numbers and quantities through our RFQ form or to info@prosourcemro.com. We confirm price, availability and lead time within 1 business day — no account needed.

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Product codes & specifications
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Product codeSpec
BNK0401-3G0+77LC3YStroke: 20 mm | Shaft length: 77 mm | Accuracy: C3 | Clearance: G0 (0 or less, preloaded) | Load rating: Ca 0.29 / C0a 0.42 kN
BNK0401-3GT+77LC3YStroke: 20 mm | Shaft length: 77 mm | Accuracy: C3 | Clearance: GT (0.005 mm or less) | Load rating: Ca 0.29 / C0a 0.42 kN
BNK0401-3G0+77LC5YStroke: 20 mm | Shaft length: 77 mm | Accuracy: C5 | Clearance: G0 (0 or less, preloaded) | Load rating: Ca 0.29 / C0a 0.42 kN
BNK0401-3GT+77LC5YStroke: 20 mm | Shaft length: 77 mm | Accuracy: C5 | Clearance: GT (0.005 mm or less) | Load rating: Ca 0.29 / C0a 0.42 kN
BNK0401-3G2+77LC7YStroke: 20 mm | Shaft length: 77 mm | Accuracy: C7 | Clearance: G2 (0.02 mm or less) | Load rating: Ca 0.29 / C0a 0.42 kN
BNK0401-3G0+97LC3YStroke: 40 mm | Shaft length: 97 mm | Accuracy: C3 | Clearance: G0 (0 or less, preloaded) | Load rating: Ca 0.29 / C0a 0.42 kN
BNK0401-3GT+97LC3YStroke: 40 mm | Shaft length: 97 mm | Accuracy: C3 | Clearance: GT (0.005 mm or less) | Load rating: Ca 0.29 / C0a 0.42 kN
BNK0401-3G0+97LC5YStroke: 40 mm | Shaft length: 97 mm | Accuracy: C5 | Clearance: G0 (0 or less, preloaded) | Load rating: Ca 0.29 / C0a 0.42 kN
BNK0401-3GT+97LC5YStroke: 40 mm | Shaft length: 97 mm | Accuracy: C5 | Clearance: GT (0.005 mm or less) | Load rating: Ca 0.29 / C0a 0.42 kN
BNK0401-3G2+97LC7YStroke: 40 mm | Shaft length: 97 mm | Accuracy: C7 | Clearance: G2 (0.02 mm or less) | Load rating: Ca 0.29 / C0a 0.42 kN
BNK0401-3G0+127LC3YStroke: 70 mm | Shaft length: 127 mm | Accuracy: C3 | Clearance: G0 (0 or less, preloaded) | Load rating: Ca 0.29 / C0a 0.42 kN
BNK0401-3GT+127LC3YStroke: 70 mm | Shaft length: 127 mm | Accuracy: C3 | Clearance: GT (0.005 mm or less) | Load rating: Ca 0.29 / C0a 0.42 kN
BNK0401-3G0+127LC5YStroke: 70 mm | Shaft length: 127 mm | Accuracy: C5 | Clearance: G0 (0 or less, preloaded) | Load rating: Ca 0.29 / C0a 0.42 kN
BNK0401-3GT+127LC5YStroke: 70 mm | Shaft length: 127 mm | Accuracy: C5 | Clearance: GT (0.005 mm or less) | Load rating: Ca 0.29 / C0a 0.42 kN
BNK0401-3G2+127LC7YStroke: 70 mm | Shaft length: 127 mm | Accuracy: C7 | Clearance: G2 (0.02 mm or less) | Load rating: Ca 0.29 / C0a 0.42 kN

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