Stainless Steel DIN 472 Internal Circlip / Hole Retaining Ring

Wanluo’s China high quality Stainless Steel DIN 472 Internal Circlip / Hole Retaining Ring are strictly manufactured according to German DIN industrial standards, serving as professional elastic retaining fasteners for hole positioning.

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Product Description

Different from DIN 471 shaft external circlips for outer shaft clamping, Stainless Steel DIN 472 Internal Circlip / Hole Retaining Ring by Wanluo factory features an inward opening elastic structure, specially designed for clamping and limiting inner hole grooves. With reliable elastic expansion and clamping performance, it is embedded inside precision hole grooves to fix pins, bearings, inner shafts and built-in components, effectively preventing internal parts from falling out and axial displacement under operating vibration and load impact. Featuring compact structure, high clamping precision and easy assembly, it is a core standard fastener for built-in mechanical assembly and precision hole position limit.

Product Construction Design & Industrial Fabrication Process

DIN 472 internal hole circlips adopt high-purity spring steel and premium stainless steel materials, processed by integrated precision stamping, overall quenching and tempering heat treatment and fine edge trimming. The unique inward opening structure and symmetrical mounting holes perfectly match professional circlip pliers for rapid expansion installation and disassembly. The outer circle radian and clamping diameter are precisely calibrated to achieve full contact and tight fit with standard inner hole grooves, avoiding loose clamping, offset or falling off. The overall ring body thickness is uniform with excellent elastic toughness and fatigue resistance, maintaining stable clamping performance after repeated expansion and long-term cyclic operation without permanent deformation or elastic failure. Burr-free smooth surface effectively protects hole wall inner diameter and precision fitted parts from scratch and abrasion, meeting high-precision mechanical assembly standards.

Product Parameter

Parameter Item	Detailed Specification
Product Name	DIN 472 Internal Circlip, Hole Retaining Ring, Internal Snap Ring
Executive Standard	DIN 472, ISO Standard, GB Standard, Custom Non-standard Sizes
Available Material	304, 316L Stainless Steel, High-quality Spring Steel, Zinc-plated Carbon Steel
Size Range	Hole diameter φ8mm-φ100mm full standard sizes, custom special aperture & thickness
Structure Type	Internal inward opening elastic ring, double mounting holes, inner hole groove clamping type
Processing Technology	Precision stamping, heat treatment toughening, edge deburring, elastic calibration
Applicable Object	Mechanical inner holes, bearing holes, cylinder holes and precision built-in groove positions
Surface Treatment	Pickling & passivation / Zinc-plated / Black oxide, anti-rust & anti-corrosion
Mechanical Properties	Stable elastic clamping force, anti-fatigue, anti-loosening, durable limit performance
Packaging Method	Moisture-proof inner bag + export carton, pallet packing for bulk orders
Supply Service	Spot bulk supply, non-standard customization, mixed fastener one-stop procurement

Stainless Steel Din 472 Internal Circlip Hole Retaining Ring

Nominal Diameter d^①		8	9	10	11	12	13	14	15	16	17	18	19	20	21	22
s	max	0.8	0.8	1	1	1	1	1	1	1	1	1	1	1	1	1
s	min	0.75	0.75	0.94	0.94	0.94	0.94	0.94	0.94	0.94	0.94	0.94	0.94	0.94	0.94	0.94
d_c	Nominal Size	8.7	9.8	10.8	11.8	13	14.1	15.1	16.2	17.3	18.3	19.5	20.5	21.5	22.5	23.5
	max	9.06	10.16	11.16	12.16	13.36	14.46	15.46	16.56	17.66	18.72	19.92	20.92	21.92	22.92	23.92
	min	8.6	9.7	10.7	11.7	12.9	14	15	16.1	17.2	18.17	19.37	20.37	21.37	22.37	23.37
a	max	2.4	2.5	3.2	3.3	3.4	3.6	3.7	3.7	3.8	3.9	4.1	4.1	4.2	4.2	4.2
b	≈	1.1	1.3	1.4	1.5	1.7	1.8	1.9	2.0	2.0	2.1	2.2	2.2	2.3	2.4	2.5
d₁	min	1.0	1.0	1.2	1.2	1.5	1.5	1.7	1.7	1.7	1.7	2.0	2.0	2.0	2.0	2.0
d₂		3.0	3.7	3.3	4.1	4.9	5.4	6.2	7.2	8.0	8.8	9.4	10.4	11.2	12.2	13.2
per 1000units ≈ kg		0.14	0.15	0.18	0.31	0.37	0.42	0.52	0.56	0.60	0.65	0.74	0.83	0.90	1.00	1.10

Nominal Diameter d^①		24	25	26	28	30	31	32	34	35	36	37	38	40	42	45
s	max	1.2	1.2	1.2	1.2	1.2	1.2	1.2	1.5	1.5	1.5	1.5	1.5	1.75	1.75	1.75
s	min	1.14	1.14	1.14	1.14	1.14	1.14	1.14	1.44	1.44	1.44	1.44	1.44	1.69	1.69	1.69
d_c	Nominal Size	25.9	26.9	27.9	30.1	32.1	33.4	34.4	36.5	37.8	38.8	39.8	40.8	43.5	45.5	48.5
	max	26.32	27.32	28.32	30.6	32.6	33.9	34.9	37	38.3	39.3	40.3	41.3	44.4	46.4	49.4
	min	25.69	26.69	27.69	29.85	31.85	33.15	34.15	36.25	37.55	38.55	39.55	40.55	43.11	45.11	48.11
a	max	4.4	4.5	4.7	4.8	4.8	5.2	5.4	5.4	5.4	5.4	5.5	5.5	5.8	5.9	6.2
b	≈	2.6	2.7	2.8	2.9	3.0	3.2	3.2	3.3	3.4	3.5	3.6	3.7	3.9	4.1	4.3
d₁	min	2.0	2.0	2.0	2.0	2.0	2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5
d₂		14.8	15.5	16.1	17.9	19.9	20.0	20.6	22.6	23.6	24.6	25.4	26.4	27.8	29.6	32.0
per 1000units ≈ kg		1.42	1.50	1.60	1.80	2.06	2.10	2.21	3.20	3.54	3.70	3.74	3.90	4.70	5.40	6.00

Nominal Diameter d^①		47	48	50	52	55	56	58	60	62	63	65	68	70	72	75
s	max	1.75	1.75	2	2	2	2	2	2	2	2	2.5	2.5	2.5	2.5	2.5
s	min	1.69	1.69	1.93	1.93	1.93	1.93	1.93	1.93	1.93	1.93	2.43	2.43	2.43	2.43	2.43
d_c	Nominal Size	50.5	51.5	54.2	56.2	59.2	60.2	62.2	64.2	66.2	67.2	69.2	72.5	74.5	76.5	79.5
	max	51.6	52.6	55.3	57.3	60.3	61.3	63.3	65.3	67.3	68.3	70.3	73.6	75.6	77.6	80.6
	min	50.04	51.04	53.74	55.74	58.74	59.74	61.74	63.74	65.74	66.74	68.74	72.04	74.04	76.04	79.04
a	max	6.4	6.4	6.5	6.7	6.8	6.8	6.9	7.3	7.3	7.3	7.6	7.8	7.8	7.8	7.8
b	≈	4.4	4.5	4.6	4.7	5.0	5.1	5.2	5.4	5.5	5.6	5.8	6.1	6.2	6.4	6.6
d₁	min	2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5	3.0	3.0	3.0	3.0	3.0
d₂		33.5	34.5	36.3	37.9	40.7	41.7	43.5	44.7	46.7	47.7	49.0	51.6	53.6	55.6	58.6
per 1000units ≈ kg		6.10	6.70	7.30	8.20	8.30	8.70	10.5	11.1	11.2	12.4	14.3	16.0	16.5	18.1	18.8

Nominal Diameter d^①		78	80	82	85	88	90	92	95	98	100	102	105	108	110	112
s	max	2.5	2.5	2.5	3	3	3	3	3	3	3	4	4	4	4	4
s	min	2.43	2.43	2.43	2.92	2.92	2.92	2.92	2.92	2.92	2.92	3.9	3.9	3.9	3.9	3.9
d_c	Nominal Size	82.5	85.5	87.5	90.5	93.5	95.5	97.5	100.5	103.5	105.5	108	112	115	117	119
	max	83.8	86.8	88.8	91.8	94.8	96.8	98.8	101.8	104.8	106.8	109.3	113.3	116.3	118.3	120.3
	min	81.96	84.96	86.96	89.96	92.96	94.96	96.96	99.96	102.96	104.96	107.46	111.46	114.46	116.46	118.46
a	max	8.5	8.5	8.5	8.6	8.6	8.6	8.7	8.8	9.0	9.2	9.5	9.5	9.5	10.4	10.5
b	≈	6.8	7.0	7.0	7.2	7.4	7.6	7.8	8.1	8.3	8.4	8.5	8.7	8.9	9.0	9.1
d₁	min	3.0	3.0	3.0	3.5	3.5	3.5	3.5	3.5	3.5	3.5	3.5	3.5	3.5	3.5	3.5
d₂		60.1	62.1	64.1	66.9	69.9	71.9	73.7	76.5	79.0	80.6	82.0	85.0	88.0	88.2	90.0
per 1000units ≈ kg		20.4	22.0	24.0	25.3	28.0	31.0	32.0	35.0	37.0	38.0	55.0	56.0	60.0	64.5	72.0

Product Superiority Highlights & Cross-Industry Application Scenarios

1. Professional inner hole clamping structure perfectly matches standard hole groove sizes, providing uniform circumferential elastic clamping force, effectively limiting axial movement of built-in bearings, shafts and pin parts to prevent internal component detachment.

2. Strict integral heat treatment process enhances elastic stability and mechanical toughness, ensuring no elastic fatigue, relaxation or fracture after long-term vibration and repeated assembly, maintaining long-term precise limit accuracy.

3. Symmetrical double-hole design supports fast expansion installation and disassembly with special circlip pliers, greatly improving production assembly efficiency and later equipment maintenance convenience, suitable for large-scale industrial batch production.

4. Ultra-smooth burr-free finish protects inner hole wall and precision matching parts from abrasion and scratch, avoiding assembly damage and equipment jitter, ensuring stable operation of precision mechanical structures.

5. Diversified material and surface treatment solutions adapt to multiple working scenarios, widely used in hydraulic pneumatic components, automotive precision parts, household appliances, automation equipment and mechanical engineering hole position limit structures.

Stainless Steel Din 472 Internal Circlip Hole Retaining Ring

FAQ

Q1: What is the main purpose of DIN 472 circlip?

A1: DIN 472 is an internal hole circlip, installed inside pre-opened holes and embedded in hole grooves. It is used for fixing and limiting built-in bearings, shafts and cylindrical parts to prevent axial falling off and displacement of internal components.

Q2: Key differences between DIN 472 and DIN 471?

A2: DIN 471 is external circlip for shaft outer clamping with outward opening; DIN 472 is internal circlip for hole inner clamping with inward opening. The two have opposite structural stress directions and are completely non-interchangeable, forming a complete set of shaft and hole limit fasteners.

Q3: Is the DIN 472 circlip easy to deform during installation?

A3: No. Our products adopt professional spring steel toughening treatment with strong toughness and rigidity. Standard tool expansion installation will not cause permanent deformation, and the circlip can quickly rebound to standard size for tight clamping.

Q4: What scenarios are suitable for DIN 472?

A4: It is widely applicable to all built-in hole limit scenarios, such as hydraulic valve holes, motor bearing holes, equipment assembly holes, cylinder parts, precision instrument holes and automated mechanical inner cavity fixing structures.

Q5: Can customized non-standard hole circlips be provided?

A5: Yes. We support customizing special inner and outer diameter, thickness, groove matching size and high anti-corrosion surface treatment to meet personalized limit requirements of special mechanical hole positions.

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