20491-TRW 90 Degree Metric Female 24 Degree Cone O-Ring Fitting

Our 90 degree metric female 24 degree cone O-ring fitting, series 20491-TRW, is a one-piece crimp-on elbow that connects braided hydraulic hose to metric female ports at a right angle. The 24 degree cone seat carries a pre-installed O-ring, so the seal is made the moment the swivel nut is tightened. The range covers M12x1.5 to M52x2 threads, dash size -03 to -24, hose bore DN5 to DN40. Every elbow is formed in one piece, without welding, and 100% dimensionally inspected before shipment.

コンプライアンスおよび基準：

• DIN 3865 (metric 24 degree cone connector with O-ring, Form A)
• ISO 8434-1 (24 degree cone connector geometry)
• DIN 2353 light series (L.T.) dimensional standard
• 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）

購入者がこのエルボを選ぶ理由：

• One-piece 90 degree elbow. 単一の鍛造品または冷間圧造ブランクから成形されています。曲げ部に溶接がなく、衝撃圧力下でも弱点が生じません。.
• The standard right-angle connection. Pumps, valve blocks and cylinders use 90 degree outlets more than any other angle. This elbow covers them with one part.
• 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.
• Small sizes included. The range starts at M12x1.5, dash -03, for DN5 hose – a size often missing from competitor elbow programs.

90 Degree Metric Female 24 Degree Cone O-Ring Fitting Technical Specifications

The table below lists all 23 sizes of the 20491-TRW 90 degree metric female 24 degree cone O-ring fitting. Dimensions are in millimeters. Each fitting ships with the O-ring size listed, matched to the cone seat. Dim. A is the horizontal distance from the nut axis to the hose-end shoulder, Dim. H is the height from the nut face to the hose axis, Dim. C is the cone zone length, and S2 is the wrench size across flats.

Notes: The -RW suffix denotes the braided-hose version; for spiral-wound hose, use series 20492-XX-XXTRW. The swivel nut is free to rotate for easy alignment before final tightening.

Why a One-Piece 90 Degree Elbow

A 90 degree outlet is the most common port direction in hydraulic systems. Pumps, valve manifolds and cylinder heads all route hoses at right angles. A straight fitting plus a separate 90 degree adapter adds two potential leak points and extra length. This 90 degree metric female 24 degree cone O-ring fitting replaces that stack with a single component.

The elbow body is formed in one piece by hot forging or cold heading, then machined to tolerance. There is no welded seam at the bend. Our impulse testing found that a one-piece elbow survives pressure cycling significantly longer than a welded two-piece elbow of the same size. The compact 90 degree geometry also keeps the hose close to the machine frame, which reduces cover wear and protects the hose from snagging.

How the O-Ring Seal Works

The O-ring sits in a groove inside the 24 degree cone seat of the swivel 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 swivel nut can be re-tightened several times without seal degradation. Third, there is no need for thread sealant, tape or paste.

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 and EN 853 1SN / 2SN. 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. Our production testing found that a verified crimp O.D. within the published tolerance (typically +/- 0.2 mm) gives a burst safety margin of 4:1 or higher on the complete assembly.

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 light series 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 light series. 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 90 Degree Metric Female 24 Degree Cone O-Ring Fitting

Selection is a four-step process. First, confirm the port needs a right angle. Second, match the hose bore to the dash size. Third, match the thread to your port. Fourth, confirm the hose construction version (-RW for braided, 20492 series for spiral).

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： 20491-22-08RW.

ホースシリーズから選択

The 20491-TRW elbow is designed for braided hydraulic hose. Recommended matching constructions:

• SAE 100 R1AT (one wire braid) – for -03 to -24 sizes
• SAE 100 R2AT (two wire braid) – for -03 to -24 sizes
• EN 853 1SN および 2SN（同等の欧州規格）
• DIN EN 857 1SC and 2SC (compact constructions, confirm insert depth)

ねじサイズで選択

The swivel nut carries a metric female thread that accepts a 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： M12x1.5, M14x1.5, M16x1.5, M18x1.5 (dash -03 to -06)
• 中サイズ： M22x1.5, M26x1.5, M27x1.5, M30x2 (dash -05 to -12)
• 大きいサイズ： M36x2, M45x2, M52x2 (dash -12 to -24)

The swivel nut rotates freely before tightening, which lets you align the 90 degree outlet in any direction around the port axis.

90 Degree vs 45 Degree vs Straight – Which One Do You Need

Use a straight fitting when the hose leaves the port in line with the port axis. Use a 90 degree elbow when the hose must turn immediately, such as at a pump port or valve manifold edge. Use a 45 degree elbow when the hose needs a shallow angle change. When in doubt, send us a sketch of your routing and our engineers will confirm the correct angle and size within one working day.

関連項目

This series replaces equivalent DIN 3865 / DIN 2353 light series 90 degree 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 90 degree metric female 24 degree cone O-ring fitting size from dash -03 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 align the swivel nut and tighten it 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.
• Align the swivel nut before final tightening. Rotate the 90 degree outlet to its final direction, then tighten. Do not use the hose to twist the nut into position after tightening.
• 規定通りに締め付けてください。. Use the hex S2 and tighten to the torque value on the data sheet. Over-tightening distorts the cone seat. Under-tightening causes vibration loosening.
• 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 90 degree metric female 24 degree cone O-ring fitting solutions for OEM programs.

カスタマイズサービス

• 角度とねじのカスタマイズ。. お客様のホース構造に合わせて、特殊な曲げ角度、非標準のねじ長さ、およびカスタム仕様のテール長さに対応いたします。.
• 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 90 degree metric female 24 degree cone O-ring fitting?

It is a one-piece elbow fitting whose swivel nut carries a metric female thread with a 24 degree cone seat and a pre-installed O-ring. The 90 degree outlet redirects the hose at a right angle to the port axis. The geometry follows DIN 3865 and ISO 8434-1.

Why choose a 90 degree elbow instead of a straight fitting?

A 90 degree elbow turns the hose immediately at the port, which is the standard routing at pumps, valve manifolds and cylinder heads. It removes the need for a separate adapter and keeps the hose close to the machine frame.

Is the O-ring included?

Yes. Every 20491-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 20491-TRW fitting?

The 20491-TRW version is designed for braided hydraulic hose such as SAE 100 R1AT, R2AT and EN 853 1SN / 2SN. For spiral-wound hose, use the 20492 series.

What is the difference between light series and heavy series?

Light series (L.T.) fittings have smaller hex and thread dimensions for the same bore and are used for lower pressure systems. Heavy series (S.T.) fittings use larger dimensions for higher pressure service. This page covers the light series per DIN 2353.

Do you supply small sizes below DN6?

Yes. The range starts at dash -03 (DN5, M12x1.5), which covers compact hydraulic circuits often used in agricultural and material handling equipment.

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 90 Degree Metric Female 24 Degree Cone O-Ring Fitting

ホースの型番、ねじサイズ、屈曲角度、および年間使用量をお知らせください。1営業日以内に、正式な見積書、対応する圧着データシート、および納期をご返信いたします。緊急のプロジェクトについては、当社のエンジニアがオンラインで圧着パラメータや配管ルートの検証をサポートいたします。.