SI..C Series Female Rod End Bearing | Spherical Plain Bearings and Rod Ends丨Gonuo

Maintenance-free

SI..C Series Female Rod End Bearing - Self-Lubricating, Metric

The rod end body is equipped with left-hand (LH) or right-hand (RH) internal threads. Composed of rod end body and self-lubricating radial spherical plain bearing GE..UK or GE..ET 2RS. The rod end body is zinc-plated.

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SI..C Series Female Rod End Bearing Description

The SI..C/SI..ET 2RS Series is a double-sealed precision rod end bearing with internal threads. Equipped with left-hand or right-hand internal threads, it is specifically designed for internal linkage connections in equipment requiring high precision and high sealing performance, widely used in automated equipment, precision machine tools, auto parts, and other scenarios. The ball is made of high-quality bearing steel, subjected to deep quenching and precision grinding (hardness HRC 58-62) with hard chrome plating on the surface. The outer ring is brass, and the rod end body is made of medium carbon steel with environmentally friendly zinc plating. Larger specifications can be equipped with a 2RS double rubber seal ring, offering excellent sealing performance to effectively prevent grease leakage and impurity ingress. Combined with a self-lubricating PTFE bushing, it is maintenance-free with high transmission precision, capable of stably bearing medium loads and adapting to high-precision linkage requirements.

Core Advantages

1. Excellent sealing performance for leakage and impurity prevention

2. Precision-ground ball for high transmission accuracy, suitable for high-precision equipment

3. Self-lubrication and maintenance-free for long-term stable operation

4. Optional left-hand/right-hand internal threads for flexible adaptation

5. Brass outer ring + environmentally friendly zinc plating for wear and corrosion resistance, suitable for precision scenarios

Sliding Contact Pair:	Steel/PTFE Composite
Rod End Body Material:	Medium Carbon Steel, Environmental Zinc Plated
Outer Ring Material:	Carbon Steel
Ball:	Bearing Steel, Heat Treatment, Hardness HRC 58-62, Hard Chromium Plated

Technical Specifications

Bearing number	Dimensions														kN Load Ratings		g Weight
Bearing number	d	d₃	B	C₁	d₂	L₃ min	W	d₄	d₅	L₅	h₁	L₄	dₖ	α° ≈	Dynamic	Static	g Weight
SI 6 C	6	M6×1.0	6	4.4	21	11	11	10	13	5	30	40.5	10	13	3.60	8.15	21
SI 8 C	8	M8×1.25	8	6	24	15	14	12.5	16	5	36	48	13	15	5.85	12.9	39
SI 10 C	10	M10×1.5	9	7	29	20	17	15	19	6.5	43	57.5	16	12	8.65	17.6	61
SI 12 C	12	M12×1.75	10	8	34	23	19	17.5	22	6.5	50	67	18	11	11.4	24.5	96
SI 15 C	15	M14×2.0	12	10	40	30	22	21	26	8	61	81	22	8	17.6	36.0	180
SI 17 C	17	M16×2.0	14	11	46	34	27	24	30	10	67	90	25	10	22.4	45.0	220
SI 20 C	20	M20×1.5	16	13	53	40	32	27.5	35	10	77	103.5	29	9	31.5	60	350
SI 25 C	25	M24×2.0	20	17	64	48	36	33.5	42	12	94	126	35.5	7	51.0	83.0	640
SI 30 C	30	M30×2.0	22	19	73	56	41	40	50	15	110	146.5	40.7	6	66.5	110	930
SI 35 ET 2RS	35	M36×3.0	25	21	82	60	50	47	58	15	125	166	47	6	112	146	1300
SI 40ET 2RS	40	M39×3.0	28	23	92	65	55	52	65	18	142	188	53	7	140	180	2000
SI 45ET 2RS	45	M42×3.0	32	27	102	65	60	58	70	20	145	196	60	7	180	240	2500
SI 50ET 2RS	50	M45×3.0	35	30	112	68	65	62	75	20	160	216	66	6	220	290	3500
SI 60ET 2RS	60	M52×3.0	44	38	135	70	75	70	88	20	175	242.5	80	6	345	450	5500
SI 70ET 2RS	70	M56×4.0	49	42	160	80	85	80	98	20	200	280	92	6	440	610	8600
SI 80ET 2RS	80	M64×4.0	55	47	180	85	100	95	110	25	230	320	105	6	570	750	12000

Tips:
If the thread is left-hand (LH), the letter "L" must be appended to the bearing designation, e.g., SIL6C.
For bearing bore diameter d ≥ 35, the ET 2RS (sealed) design is required.

Applications

Industrial Automation: Linkages in packaging machinery, printing presses, and textile equipment.

Construction Machinery: Control linkages for excavators, loaders, and compactors.

Material Handling: Pivot points for conveyors, lifts, and automated guided vehicles.

Off-Highway Vehicles: Steering and throttle linkages for tractors and agricultural implements.

Hydraulic & Pneumatic Cylinders: End mounts for cylinders requiring a secure male thread connection.

Why Choose Us?

When you choose Gonuo, you benefit from our integrated manufacturing and quality system, directly addressing the core concerns of overseas buyers.

Integrated Industry-Trade Manufacturing

As an integrated industry-and-trade manufacturer, we control the entire supply chain — from raw material sourcing to final assembly. This ensures unmatched batch-to-batch consistency, eliminates quality risks, and guarantees stable production for every order.

Technical Precision & Customization

Need specific thread lengths, enhanced corrosion protection, or special materials? Our experienced engineering team provides full technical support for complex designs and offers non-standard customization, focusing on tight tolerances and reliable performance for your critical applications.

Reliable Quality, Proven Consistency

Our end-to-end strict quality control (QC) processes deliver components with up to 30% longer service life under demanding conditions. We provide material certifications and test reports for complete traceability and peace of mind.

Reliable Supply & Better Value

Leveraging our mature supply chain and large-scale production, we offer stable supply, competitive pricing, and flexible MOQs (bulk or small batches). Our fast replenishment system aligns with your production schedule, helping you reduce procurement costs without compromising quality.

Two Decades of Global Trust

For over 20 years, Gonuo has been a trusted brand in precision transmission components, exporting to North America, South America, Russia, and beyond. Based in Ningbo, China, we are committed to consistent quality and long-term partnerships, serving industries worldwide.

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