1621046900 Shaft Bushing for Air Compressor Bearing — Steel Sleeve Spacer

Air Compressor MRO · Bearing Steel Sleeve · Cross-Reference Required

The 1621046900 shaft bushing is a hardened, ground bearing-steel sleeve used in rotary screw and reciprocating air compressors as a precision spacer between the rotor shaft and the bearing inner ring. The most-likely cross-reference is the Atlas Copco / Ingersoll-Rand / Sullair bearing sleeve family found in GA, GX, G, R, UP, SSR and LS series oil-injected and oil-free compressors. Because the bare number 1621046900 is shared across several OEM part books, the exact fit must be confirmed against the compressor nameplate before order. Send your nameplate photo to Moritta@KOEED.COM and our engineers will verify the cross-reference within one business day.

1. Key Technical Specifications & Overview

The 1621046900 bushing is a single-piece, through-hardened sleeve manufactured from bearing steel (SUJ2 / AISI 52100 equivalent). It is finish-ground on both the inner diameter (shaft seat) and the outer diameter (housing seat) to a tolerance class suitable for press-fit installation, axial location of the rotor bearing, and concentric alignment of the rotating assembly. The most-likely interpretation is an Atlas Copco air compressor bearing sleeve used during major overhaul of the rotor-bearing stack on GA / GX / G series oil-injected screw compressors, with secondary fitment on Ingersoll-Rand R / UP / SSR, Sullair LS, and Compair screw machines. It is not an automation control part and is not sourced from the Allen-Bradley, Siemens, Mitsubishi, Omron, Fanuc, Schneider, Yaskawa, Panasonic or KEYENCE product lines — it is a mechanical MRO consumable that keeps those same lines running.

Note on ambiguity: the same 10-digit code 1621046900 appears on different OEM parts lists as either a rotor-shaft sleeve, a bearing-spacer ring, or a coupling-side spacer. Treating it as a generic industrial bearing sleeve and measuring the existing part is the safest first step.

2. Application Scenarios — Where It Fits

A shaft bushing of this geometry sits between the rotor and the bearing inner ring. Its job is to set axial position, control thermal growth clearance, and provide a hardened press-fit surface so the bearing does not creep on the shaft. Typical installations include:

• Atlas Copco GA / GX / G series oil-injected rotary screw compressors (7–75 kW) — drive-end and gear-end bearing stacks.
• Ingersoll-Rand R / UP / SSR oil-injected screw compressors and oil-free SSR units.
• Sullair LS series oil-injected compressors and select Compair / Gardner Denver machines sharing the same rotor-bearing layout.
• Reciprocating piston compressors using an internal sleeve to align the connecting-rod or crosshead bearing.
• General MRO on any rotating equipment where a hardened spacer is required between a shaft shoulder and the inner ring of a rolling-element bearing.

In a typical plant, the same air-compressor room that feeds the Allen-Bradley ControlLogix rack, the Siemens S7-1500 PLC, the Mitsubishi MELSEC iQ-R CPU, the Omron SYSMAC CJ2, and the Fanuc CNC also relies on a healthy compressor. KOEED sources both sides of that stack — the controls (Schneider Modicon, Yaskawa Σ-7, Panasonic FP, KEYENCE vision) and the mechanical MRO consumables like the 1621046900 bushing that keep the production line breathing.

3. Integration & Mechanical Interface Notes

Although a shaft bushing has no electrical wiring, the integration rules matter as much as on a PLC module: install the wrong sleeve and you trash the bearing.

• Match the host bore and shaft journal. Measure the existing bushing’s OD with a caliper (typical range 30–120 mm) and the ID against the shaft journal. A 0.05 mm mismatch is enough to crack the housing on press-fit.
• Mind the axial stack. The bushing sits between the bearing inner ring and the shaft shoulder or locking nut. Check the shoulder-to-bearing face distance against the bushing length so the bearing is preloaded correctly.
• Surface finish is functional, not cosmetic. A reground shaft with the wrong roughness will gall into the bushing. Keep the mating surface at Ra ≤ 0.8 µm and lubricate with compressor oil on assembly.
• Never reuse a deformed sleeve. If the old bushing shows brinelling, ovality > 0.02 mm, or rust pitting, replace it. A marginal bushing is the most common root cause of premature bearing failure on compressor overhaul.
• Document the BOM line. Record OD x ID x L, material, hardness, and the host compressor model / serial on the maintenance sheet so the next overhaul can match it directly.

For a deeper mechanical context, our China Sourcing Company team can pull a sample bushing from the field, hardness-test it, and report the actual chemistry against the spec before you commit to a bulk order.

4. Installation & Commissioning Tips

A shaft bushing is installed during compressor overhaul, not commissioning of a new control system — but the discipline is the same as the one we recommend for any Allen-Bradley ControlLogix swap or a Siemens S7-1500 migration. Follow the sequence below to avoid a second teardown.

1. Isolate and depressurize. Lock out the compressor, vent the receiver, and confirm zero residual pressure on the oil separator tank before opening the end-cover.
2. Clean the housing bore. Wipe with lint-free cloth and solvent. Any swarf left in the bore will be pressed into the new bushing and transferred to the bearing race.
3. Chill or heat-fit the bushing. For a press-fit into a steel housing, cool the bushing in dry ice / alcohol or heat the housing evenly. Tap in with a brass drift, never a steel hammer directly on the sleeve.
4. Verify concentricity. Rotate the shaft by hand and dial-indicator the bushing ID runout. Target ≤ 0.02 mm TIR. A misaligned sleeve will hammer the bearing in the first 200 hours.
5. Reassemble and run-in. Refill with the correct compressor oil grade, run unloaded for 30 minutes, then loaded at 50 % for another 30 minutes. Log vibration and discharge temperature during the first 8 hours.
6. Record the result. Add the bushing P/N, OD x ID x L, install date, and tech initials to the compressor’s maintenance log so the next overhaul knows exactly what is in there.

The same checklist logic applies to electronics commissioning: isolate, verify, document, then run-in. If you need help mapping the compressor’s controls — for example a Mitsubishi GOT HMI driving a Yaskawa Σ-7 servo on the inlet valve — our engineers can quote the controls and the bushing in the same BOM.

5. Procurement, Warranty & Lead Time

Because the bare P/N 1621046900 is ambiguous, KOEED treats this part as a cross-reference enquiry, not a stock SKU. The fastest way to a clean quote is to send:

• One photo of the existing bushing (preferably with a ruler or caliper in frame) showing OD, ID, length, and any etched markings.
• One photo of the compressor nameplate with the model, serial, and OEM P/N visible.
• The host machine brand — Atlas Copco, Ingersoll-Rand, Sullair, Compair, or generic — and the application (oil-injected screw, oil-free screw, piston).
• Quantity and target unit price band (if any).

Once we confirm the cross-reference, KOEED commits to a written quote within 24 hours on business days, with lead time, material cert, and hardness test report on request. We do not publish a fixed unit price for a bushing of unknown geometry — the price depends on OD x ID x L, batch quantity, and whether a custom drawing is required. Worldwide shipping is available via DHL / FedEx / UPS for small batches and sea freight for container volumes. Warranty is 12 months from delivery against manufacturing defect; consumable wear is excluded as usual for MRO sleeves.

Most cross-reference requests clear in one round-trip; if the bushing turns out to be a non-standard geometry, our China Sourcing Company can draw, sample, and ship a custom batch in 3–4 weeks.

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