20511-TRW Metric Female 24 Degree Cone O-Ring Heavy Series Fitting

Our metric female 24 degree cone O-ring heavy series fitting, series 20511-TRW, is the heavy-duty (H.T.) version of our light series female range. It is a crimp-on hydraulic hose fitting built to the DIN 2353 heavy series dimensional standard with a 24 degree cone seat and a pre-installed O-ring, sized and heat-treated for higher pressure service. The range covers M14x1.5 to M52x2 threads, dash size -04 to -24, hose bore DN6 to DN40. Every fitting ships with its matched O-ring and is 100% dimensionally inspected before packing.

コンプライアンスおよび基準：

• DIN 2353 heavy series (H.T.) dimensional standard
• DIN 3865 (metric 24 degree cone connector with O-ring, Form A)
• ISO 8434-1 (24 degree cone connector geometry)
• ISO 12151 series (hose fittings with 24 degree cone connectors)
• SAE J516（油圧ホース継手の一般的な設計指針）

Why buyers choose this fitting:

• Heavy series rating. The H.T. design uses larger hex and thread dimensions than the light series for the same bore, carrying higher working pressures on high pressure hose circuits.
• O-ring included with every fitting. The O-ring sits in the 24 degree cone seat and provides the seal. No tape, no paste, no guesswork at assembly.
• Matched to 2SN and 4SP hose. The heavy series profile is the standard partner for SAE 100 R2AT, EN 853 2SN and spiral-wound high pressure hose constructions.
• 広い温度範囲。. Rated for -40°C to +100°C continuous duty with the standard NBR O-ring.

Metric Female 24 Degree Cone O-Ring Heavy Series Fitting Technical Specifications

The table below lists all 19 sizes of the 20511-TRW metric female 24 degree cone O-ring heavy series fitting. Dimensions are in millimeters. Each fitting ships with the O-ring size listed in the table, matched to the cone seat.

*Row 20511-45-20TRW: the thread, hose bore and tube O.D. were corrected to match the part number logic (M45x2, DN32, tube 35 mm). The O-ring size and hex S2 shown are the OCR readings and appear identical to the 52-24TRW row; confirm both values against the original HENGHUA spec sheet before large orders.

Notes: Dim. A is the assembly reference length from the nut face to the hose-end shoulder. Dim. C is the cone zone length. Hex S2 is the wrench size across flats. The -RW suffix denotes the braided-hose version; for spiral-wound hose, use series 20512-XX-XXTRW. The 20511 series is the heavy series (H.T.) counterpart of the 20411 light series.

Heavy Series vs Light Series – What Is the Difference

The DIN 2353 standard defines two dimensional series for the same 24 degree cone connection: light (L.T.) and heavy (S.T., also written H.T.). For the same hose bore, the heavy series uses a larger thread, a larger hex and a larger cone seat than the light series.

This trade-off has a clear logic. The heavy series carries higher connection pressure ratings, which is why it is the standard choice for high pressure braided hose (SAE 100 R2AT, EN 853 2SN) and for spiral-wound hose assemblies. The light series is preferred where compactness and lower cost matter more than the pressure ceiling. If your circuit runs above the light series rating, this metric female 24 degree cone O-ring heavy series fitting is the correct choice.

How the O-Ring Seal Works

The O-ring sits in a groove inside the 24 degree cone seat of the nut. When the mating male 24 degree cone stud is tightened, it compresses the O-ring against the cone wall. The O-ring, not the metal cone, carries the seal.

This gives three practical advantages for maintenance teams. First, the seal is forgiving of minor surface scratches on the mating cone. Second, the nut can be re-tightened several times without seal degradation. Third, there is no need for thread sealant, tape or paste. Replace the O-ring when you replace the hose, and the seal is as good as new.

挿入深さと圧着外径――エンジニアが求める2つの数値

挿入深さは、ホースの内径に挿入されるバーブ付きテールの長さです。圧着外径は、圧着後のフェルールの外径です。これら2つの要素によって、アセンブリが圧力を保持できるか、あるいは圧着部から漏れが生じるかが決まります。.

HENGHUA publishes the matched insert depth and crimp O.D. for every hose construction we supply, including SAE 100 R1AT, R2AT, EN 853 1SN, 2SN and spiral constructions. The values are hose-specific because reinforcement thickness changes the stack-up. Request our crimp data sheet with your hose model and we will return the exact crimp O.D. and die selection within one working day.

当社の製造試験の結果、公表されている許容範囲（通常±0.2 mm）内の圧着外径が確認された場合、完成品において4:1以上の破裂安全率を確保できることが判明しました。圧着作業のたびに、デジタルノギスで測定してください。.

材料および熱処理

• 炭素鋼（標準）： high-strength cold-headed or hot-forged carbon steel (20# / 35# / 45# grades). The tail and cone seat are case-hardened with a carburizing and quenching process for fatigue resistance. Reference hardness range is HRC 20-28 on the core with a hardened case.
• 表面仕上げ： 白亜鉛メッキまたはカラー（黄色）亜鉛メッキ（不動態化処理済み）。より厳しい塩水噴霧試験の要件に対応するため、オプションで亜鉛ニッケルメッキおよびダクロメットコーティングもご利用いただけます。.
• ステンレス鋼（オプション）： 腐食性媒体や水洗い環境向けの304、316、または316Lステンレス鋼。.
• O-ring elastomer: standard NBR (nitrile). FKM, EPDM and other elastomers are available on request for special fluids and temperatures.

耐圧・耐熱定格

The connection rating follows the DIN 2353 heavy series reference table below. These are reference values (§) for the fitting connection itself. The final working pressure of a hose assembly is set by the hose construction and the approved crimping specification.

§Reference values per DIN 2353 heavy series (H.T.), higher than the light series ratings for the same bore. Confirm the assembly rating with the HENGHUA crimp data sheet matched to your hose.

温度範囲： -40°C to +100°C with the standard NBR O-ring. At elevated temperature, apply the standard SAE J517 style derating to the assembly working pressure. The O-ring operating range can be extended with FKM material for high-temperature circuits.

耐圧試験： HENGHUAでは、定格使用圧力の最大100%までの耐圧試験済みのアセンブリを供給可能であり、ご要望に応じて試験証明書を発行いたします。.

How to Select the Right Metric Female 24 Degree Cone O-Ring Heavy Series Fitting

Selection is a three-step process. First, confirm your circuit pressure exceeds the light series rating. Second, match the hose bore to the dash size. Third, match the thread to your port.

部品番号の構成

HENGHUAの部品番号は、3つの区切りで読みます。例： 20511-22-08RW.

ホースシリーズから選択

The 20511-TRW fitting is designed for high pressure braided hydraulic hose. Recommended matching constructions:

• SAE 100 R2AT (two wire braid) – for -04 to -24 sizes
• EN 853 2SN (equivalent European construction)
• SAE 100 R1AT and EN 853 1SN (one wire braid) – where the circuit permits
• Spiral constructions (EN 856 4SP / 4SH) – use the 20512 series version

ねじサイズで選択

The female thread accepts a metric male 24 degree cone stud. The O-ring in the cone seat does the sealing, so the mating stud needs no additional sealing element:

• 小さいサイズ： M14x1.5, M16x1.5, M18x1.5, M20x1.5 (dash -04 to -06)
• 中サイズ： M22x1.5, M24x1.5, M30x2 (dash -06 to -12)
• 大きいサイズ： M36x2, M42x2, M45x2, M52x2 (dash -12 to -24)

Tightening is via the hex S2 with a standard wrench. The O-ring is pre-installed, so assembly is a simple screw-on operation.

関連項目

This series replaces equivalent DIN 3865 / DIN 2353 heavy series metric female fittings with O-ring available in the market. If you hold an OEM part number or a competitor catalog number, send it to our sales team. We confirm the direct replacement within 24 hours, including thread, dash size, hex, insert depth and O-ring size checks.

包装・物流

組み立てガイド：安全なホースの組み立てを行うための4つの手順

Follow this process for every crimped assembly. It applies to every metric female 24 degree cone O-ring heavy series fitting size from dash -04 to -24. Skipping one step is the most common cause of early fitting failure.

手順 1 – ホースを直角に切る。. 切れ味のよいホースカッターを使用してください。切り口が直角であれば、継手がホース内に均等に収まります。斜め切りやギザギザの切り口になると、隙間が生じ、そこから漏れの原因となります。.

手順 2 – 挿入深さを印をつける。. HENGHUAの圧着データシートに記載されている挿入深さを測定します。その距離の位置に、ホースカバーに線を引きます。この印は、挿入後もはっきりと見えるようにしておく必要があります。.

ステップ3 – 潤滑して挿入する。. ホースの内径とバーブ付きテール部分に、適合する組立用潤滑剤を薄く塗布してください。フィッティングをねじりながら押し込み、深さ目印がテールの端と揃うまで挿入します。目印の位置で停止してください。それ以上無理に押し込まないでください。.

手順4 – 圧着して確認する。. Select the correct die set for your hose and fitting size. Crimp in one continuous stroke. After crimping, measure the crimp O.D. with a digital caliper and compare it with the tolerance on the crimp data sheet. Record the value on your quality log. Then tighten the nut to the torque value on the data sheet.

安全上の注意 – 圧着作業を行う前に必ずお読みください

• ブランドを混ぜてはいけません。. メーカーが異なるホースや継手は、寸法が同じであっても、圧着パラメータが異なる場合があります。必ず、互いに適合するホース、継手、および圧着データシートを使用してください。.
• Never seal the 24 degree cone with tape. The O-ring in the cone seat provides the seal. Thread sealant tape or paste on the cone face damages the O-ring and destroys the seal.
• Check the O-ring before assembly. A cut, pinched or hardened O-ring must be replaced. The O-ring is the sealing element; never assemble without it.
• Do not substitute light series parts. A light series fitting on a heavy series circuit is an overpressure hazard. Check the series code on the part before assembly.
• Tapered threads need sealant. When this fitting is adapted to a tapered thread port (NPT or BSPT), the adapter requires thread sealant. Parallel thread connections with O-ring seals must never receive tape.
• 圧着済みの継手は絶対に再利用しないでください。. 圧着されると、フェルール部分は加工硬化します。再度圧着を行っても、元の締め付け力を回復させることはできません。.

OEMカスタマイズと品質トレーサビリティ

HENGHUA supplies not only standard sizes but also fully customized metric female 24 degree cone O-ring heavy series fitting solutions for OEM programs.

カスタマイズサービス

• Thread customization. Non-standard thread lengths, special threads, and custom tail lengths for your hose construction.
• O-ring elastomer selection. NBR, FKM, EPDM and other elastomers matched to your fluid and temperature range.
• 表面処理のカスタマイズ。. ホワイト亜鉛、カラー亜鉛、亜鉛ニッケル、およびダクロメットコーティングは、72時間から720時間以上までの塩水噴霧試験要件に合わせてご提供いたします。.
• レーザーマーキング。. 六角形部分に貴社のロゴ、部品番号、ロット番号をレーザー刻印し、完全なトレーサビリティを確保しています。.
• パッケージのカスタマイズ。. お客様のBOMに基づいたプライベートブランド用の箱、バーコードラベル、およびサイズが混在するキット。.

品質のトレーサビリティ

Every HENGHUA batch carries a traceable batch number. The traceability chain covers incoming material certificates, heat treatment records, dimensional inspection reports, O-ring material certificates and final packing lists. Material test reports (MTR) and third-party inspection (BV, SGS or equivalent) can be arranged before shipment. Request our sample batch and audit our quality documentation – we are confident in what it shows.

よくある質問

What is a metric female 24 degree cone O-ring heavy series fitting?

It is a heavy-duty hydraulic fitting whose nut carries a metric female thread with a 24 degree cone seat and a pre-installed O-ring. The heavy series (H.T.) follows the DIN 2353 dimensional standard for higher pressure service.

What is the difference between heavy series and light series?

For the same hose bore, the heavy series uses larger thread, hex and cone seat dimensions, which carry higher connection pressure ratings. The light series is more compact and lower cost. This page covers the heavy series (H.T.).

Is the O-ring included?

Yes. Every 20511-TRW fitting ships with the matching O-ring pre-installed in the cone seat. Spare O-rings can be ordered by the size code listed in the specification table.

Which hose works with the 20511-TRW fitting?

The 20511-TRW version is designed for high pressure braided hydraulic hose such as SAE 100 R2AT and EN 853 2SN. For spiral-wound hose, use the 20512 series.

Can I order stainless steel versions?

Yes. 304, 316 and 316L stainless steel versions are available for the full size range, with the same dimensions, O-ring sizes and crimp behavior.

最小注文数量はどれくらいですか？

在庫品の最小注文数量は100個からです。カスタマイズ品の最小注文数量は、サイズごとに500個からです。OEMの年間契約については、当社の工場チームと直接ご相談ください。.

Get a Quote for Your Metric Female 24 Degree Cone O-Ring Heavy Series Fitting

Tell us your hose model, thread size and annual volume. We reply with a formal quotation, the matching crimp data sheet and our lead time within one working day. For urgent projects, our engineers support you online with crimp parameter verification.