Ball Screw End Machining Drawing Checklist

Start the end machining drawing checklist by separating both ends

A ball screw end machining drawing should identify the fixed side and support side first. The fixed side usually handles axial location and locking, while the support side provides radial support. The two ends have different functions, so do not draw one side and leave the other for the supplier to guess.

The fixed side needs complete dimensions

The fixed side should show bearing journal diameter and length, shoulder position, lock thread, lock nut space, chamfer, and end-face reference. Wrong bearing journal diameter and length directly affect support unit assembly and preload.

Mark the support side and coupling end clearly

The support side needs shaft diameter, length, retaining groove, or shoulder information. The coupling end also needs diameter, length, keyway, flat, or set-screw position so the motor side can connect correctly.

Drawing revision and RFQ information must match

When sending the RFQ, state drawing revision, units, tolerances, surface treatment, quantity, and whether sample review is required. If old part photos and drawing dimensions disagree, clarify which information has priority before quotation.

End drawing RFQ checklist

Fixed side and support side names, direction, and support unit model.
Bearing journal diameter and length, shoulders, lock thread, keyway, and retaining groove.
Coupling end dimensions, chamfers, thread specification, tolerances, and units.
Drawing revision, sample photos, overall length, thread length, quantity, and lead time.

Typical buyer situations

This topic usually appears in distributor stocking, repair replacement, machine retrofit, automation projects, and drawing-based purchasing. If a buyer sends only one model number, the supplier cannot judge the real use, packing risk, or whether machining upgrades are needed.

Details to confirm before quotation

To reduce repeated questions, the RFQ should cover product specification, use case, and delivery expectations together. The following points can be copied into the RFQ form or email.

Purchase purpose: distributor stock, repair replacement, machine project, or sample testing.
Specification: diameter, lead, overall length, thread length, nut type, and quantity.
Machining: cut-to-length, end machining, and whether BK/BF, FK/FF, EK/EF, or other supports must be matched.
Delivery: target quantity, expected lead time, packing, labels, shipping method, and whether shipment photos are required.

Common mistakes

A common mistake is asking only for unit price without application, quantity, or packing details. Another is sending photos without dimensions. This turns quotation into guesswork and can create errors in end machining, nut matching, or long-part shipping.

Next step

If the specification is clear, submit an RFQ directly. If the model or accuracy grade is still uncertain, describe the machine use and old part details so the supplier can recommend a standard part, bar stock, cut-to-length, or end machining route.