POM / Acetal Composite Bushings (SF-2 type)
POM (acetal) composite bushings (SF-2 type) use a steel backing with a POM working layer that includes grease pockets. They suit heavy load and low speed under boundary lubrication — periodic grease is part of the design. Distinct from dry-running PTFE-lined SF-1.
When to use
- Heavy load, low sliding speed
- Oscillating or slow rotating joints where grease can be applied on a schedule
- Boundary-lubricated positions specified as SF-2 type
- Equipment duty that expects grease
Not the first pick when: true dry-running low friction is required — use PTFE-lined; or high-impact dusty pins with solid-lubricant plugs preferred — use graphite-plugged.
Forms available
- Cylindrical (sleeve) bushings
- Flanged bushings
- Common SF-2 type reference sizes on request
Materials
Layer stack (typical): steel backing + POM / acetal lining with grease pockets. Grease type and interval are application-dependent — include in RFQ notes.
Typical duty
Agricultural linkages and hitch-related joints; construction equipment grease-lubricated pivots; general machinery oscillating bearings; positions where OEM drawings call for SF-2 type / POM composite.
Operating envelope (qualitative)
Heavy load · low speed · grease / boundary lubrication. Numeric P / V / PV from factory datasheet on request.
Replacement / equivalent note
Often cross-referenced as SF-2 type (POM composite). Industry codes are for engineering cross-reference only. Liantuo Bushing is not affiliated with third-party brand owners.
Request a quote
Include d / D / L (or drawing), quantity, load & motion, temperature, medium, and shaft hardness if known. We usually reply within one business day.
Related
Common metric sizes (industry catalogs)
Industry-typical SF-2 type (POM / acetal, grease-pocket) metric sizes from open manufacturer catalogs (mm). Not a row-by-row extract of any national standard. Boundary-lubricated design — not a drop-in for dry-running SF-1.
SF-2 cylindrical — common metric series
Industry-typical fits (catalog notes): shaft often h8; housing H7 (different from SF-1 shaft f7 — do not swap by letter alone).
| d (mm) | D (mm) | Common L (mm) | Example part nos. |
|---|---|---|---|
| 10 | 12 | 10, 15, 20 | 1010, 1015, 1020 |
| 12 | 14 | 10, 15, 20 | 1210 … |
| 14 | 16 | 15, 20 | 1415, 1420 |
| 15 | 17 | 15, 20, 25 | 1515 … |
| 16 | 18 | 15, 20, 25 | 1615 … |
| 18 | 20 | 15, 20, 25 | 1815 … |
| 20 | 23 | 15, 20, 25, 30 | 2015 … 2030 |
| 22 | 25 | 15, 25 | 2215, 2225 |
| 25 | 28 | 15, 20, 25, 30 | 2515 … 2530 |
| 28 | 32 | 20, 30 | 2820, 2830 |
| 30 | 34 | 20, 25, 30, 40 | 3020 … 3040 |
| 35 | 39 | 20, 30, 35, 40 | 3520 … |
| 40 | 44 | 20, 30, 40, 50 | 4020 … 4050 |
| 45 | 50 | 20, 30, 40, 45, 50 | 4520 … |
| 50 | 55 | 30, 40, 50, 60 | 5030 … 5060 |
| 55 | 60 | 30, 40, 50, 60 | 5530 … |
| 60 | 65 | 40, 50, 60 | 6040 … |
| 65 | 70 | 40, 60 | 6540, 6560 |
| 70 | 75 | 40, 50, 80 | 7040 … 7080 |
| 80 | 85 | 40, 60, 80 | 8040 … |
| 90 | 95 | 40, 60, 80, 90 | 9040 … |
| 100 | 105 | 50, 80, 95 | 10050 … |
| 120 | 125 | 60, 80, 110 | 12060 … |
| 150 | 155 | 50, 60, 80, 100 | 15050 … |
SF-2 — frequently requested sizes
| Part no. | d (mm) | D (mm) | L (mm) |
|---|---|---|---|
| SF-2 1010 | 10 | 12 | 10 |
| SF-2 1015 | 10 | 12 | 15 |
| SF-2 1020 | 10 | 12 | 20 |
| SF-2 1210 | 12 | 14 | 10 |
| SF-2 1215 | 12 | 14 | 15 |
| SF-2 1220 | 12 | 14 | 20 |
| SF-2 1415 | 14 | 16 | 15 |
| SF-2 1420 | 14 | 16 | 20 |
| SF-2 1515 | 15 | 17 | 15 |
| SF-2 1520 | 15 | 17 | 20 |
| SF-2 1525 | 15 | 17 | 25 |
| SF-2 1615 | 16 | 18 | 15 |
| SF-2 1620 | 16 | 18 | 20 |
| SF-2 1625 | 16 | 18 | 25 |
| SF-2 1815 | 18 | 20 | 15 |
| SF-2 1820 | 18 | 20 | 20 |
| SF-2 1825 | 18 | 20 | 25 |
| SF-2 2015 | 20 | 23 | 15 |
| SF-2 2020 | 20 | 23 | 20 |
| SF-2 2025 | 20 | 23 | 25 |
| SF-2 2030 | 20 | 23 | 30 |
| SF-2 2215 | 22 | 25 | 15 |
| SF-2 2225 | 22 | 25 | 25 |
| SF-2 2515 | 25 | 28 | 15 |
| SF-2 2520 | 25 | 28 | 20 |
| SF-2 2525 | 25 | 28 | 25 |
| SF-2 2530 | 25 | 28 | 30 |
| SF-2 2820 | 28 | 32 | 20 |
| SF-2 2830 | 28 | 32 | 30 |
| SF-2 3020 | 30 | 34 | 20 |
| SF-2 3025 | 30 | 34 | 25 |
| SF-2 3030 | 30 | 34 | 30 |
| SF-2 3040 | 30 | 34 | 40 |
| SF-2 3520 | 35 | 39 | 20 |
| SF-2 3530 | 35 | 39 | 30 |
| SF-2 3540 | 35 | 39 | 40 |
| SF-2 4020 | 40 | 44 | 20 |
| SF-2 4030 | 40 | 44 | 30 |
| SF-2 4040 | 40 | 44 | 40 |
| SF-2 4050 | 40 | 44 | 50 |
| SF-2 5030 | 50 | 55 | 30 |
| SF-2 5040 | 50 | 55 | 40 |
| SF-2 5050 | 50 | 55 | 50 |
| SF-2 5060 | 50 | 55 | 60 |
| SF-2 6040 | 60 | 65 | 40 |
| SF-2 6050 | 60 | 65 | 50 |
| SF-2 6060 | 60 | 65 | 60 |
| SF-2 6540 | 65 | 70 | 40 |
| SF-2 6560 | 65 | 70 | 60 |
| SF-2 7040 | 70 | 75 | 40 |
| SF-2 7050 | 70 | 75 | 50 |
| SF-2 7080 | 70 | 75 | 80 |
| SF-2 8040 | 80 | 85 | 40 |
| SF-2 8060 | 80 | 85 | 60 |
| SF-2 8080 | 80 | 85 | 80 |
Common metric sizes (industry catalogs). Availability varies — send d / D / L (or drawing) with your RFQ. Final acceptance is per contract drawing and inspection.