Professional Rebar Bending Bushings (Comprehensive Size Range)
Introduction to Rebar Bending Bushings
Our high-quality rebar bending bushings give consistent, accurate bends. They fit the center mandrels of GW40, GW50, and GW60 machines, and control rebar bending radius. As key custom rebar bender parts, they work with most semi-automatic and fully automatic CNC rebar bending machines.
Rebar bending bushings are vital parts of rebar processing machines. They affect bending accuracy, product quality, and machine efficiency. Using the three-point bending method, they bend different rebar sizes into shapes needed for construction (e.g., stirrups, beam and column reinforcement).
Definition and Principle
What Are Rebar Bending Bushings?
Rebar bending bushings are special molds on rebar bending machine discs. They have three main parts: a central bushing, a movable bushing, and a positioning bushing. These three work together to form a standard three-point bending system.
They bend rebar precisely when moving together. You can change bushings to fit different rebar diameters, making them flexible custom rebar bender parts.
Working Principle
Rebar bending bushings use the three-point bending method. Rebar is held tightly between the central and positioning bushings. The machine moves the movable bushing to apply even pressure to the rebar.
This pressure bends the rebar around the central bushing. Change the central bushing’s diameter to adjust the bend radius. The machine’s disc rotation controls the bend angle (0-180° adjustable).
Main Specifications
Types by Function
Rebar bending bushings have three types by function: central, movable, and positioning.
The central bushing is fixed at the disc center, guiding the bend and setting the smallest bend radius. The movable bushing applies force and controls the bend angle, with an adjustable position. The positioning bushing keeps rebar from moving during bending—all key features of good custom rebar bender parts.
Types by Rebar Size
Bushings are grouped by the rebar diameter they fit, with four types:
Small: For 6-16mm rebar (stirrups, small precast parts)
Medium: For 18-28mm rebar (main structural rebar in beams, slabs)
Large: For 32-50mm rebar (columns, shear walls)
Special: Custom custom rebar bender parts for irregular rebar, high-strength steel, and HRB500 grade steel.
Key Parameters
Bushing parameters must match industry standards, machines, and materials. Key details:
Outer diameter: 30-100mm (fits 4D/5D international bending standards)
Bushing diameter: 25-120mm (1.5-5x the rebar diameter)
Width: 15-50mm (depends on rebar size and number per bend)
Shaft hole diameter: 16-40mm (fits the machine’s disc shaft for stable installation)
Materials and Manufacturing
Common Materials
Bushing material affects hardness, wear resistance, and strength. Main options:
40Cr alloy steel: Chemical composition (approx.): C 0.37-0.44%, Cr 0.80-1.10%, Si 0.17-0.37%, Mn 0.50-0.80%. Composition impact: Cr boosts hardness/wear resistance; C enhances strength; Si and Mn improve toughness. Performance: High strength, good toughness, no cracking/deformation under pressure; suitable for regular rebar processing.
Cr12MoV alloy steel: Chemical composition (approx.): C 1.45-1.70%, Cr 11.50-13.00%, Mo 0.40-0.60%, V 0.15-0.30%. Composition impact: High C/Cr ensures high hardness/wear resistance; Mo/V improves heat resistance and dimensional stability. Performance: High hardness, wear-resistant, stable; ideal for long-term standard rebar bending.
Manufacturing Processes
Precision manufacturing ensures accurate bends. Key steps:
Precision forging: Makes the bushing strong and impact-resistant
Induction hardening: Hardens the bushing for long-term use in construction
Vacuum heat treatment: Hardens evenly without bending
Precision grinding: Ensures a tight fit; diameter error is within ±0.02mm.
Maintenance and Replacement
Daily Maintenance
Simple daily care extends bushing life:
Before use: Check if it’s installed tightly and clean off debris, rust, or oil
During use: Follow rules; don’t overload or bend oversized rebar
After use: Clean and apply anti-rust oil to shaft holes—important for keeping custom rebar bender parts in good shape.
Regular Maintenance
Check weekly for batch processing:
Take bushings apart to clean and check for wear, cracks, or bending
Check fit and lubricate moving parts; replace old lubricant
Polish small wear spots; store in a dry, well-ventilated place.
Repair and Replacement Rules
Fix or replace based on wear to keep quality high:
Fix or replace based on wear to keep quality high:
Small scratches: Polish or grind to fix
Severe wear, cracks, or misalignment: Replace right away
How often should I replace rebar bushings?
There is no fixed time for replacement, and it depends on usage frequency, processing rebar specifications, and material of the bushing.
For regular use (daily batch processing): 40Cr bushings usually need replacement every 3-6 months; Cr12MoV bushings, with better wear resistance, can last 6-12 months.
Replace immediately if any of the following occurs: severe surface wear, chipping, cracks, groove deformation, shaft hole misalignment, or uneven bending results.
FAQ:
Q: What is the relationship between the bending sleeve diameter and the bending radius?
A: The outer diameter (OD) of the bending sleeve is exactly twice the required internal bending radius
Q: Why is choosing the correct sleeve size critical for rebar safety?
A: Using a sleeve that is too small (e.g., for high-tensile rebar) will cause excessive stress on the outer fibers of the steel, leading to micro-cracks or immediate snapping.
We manufacture heavy-duty Rebar Bending Bushings (Material: 40Cr, Cr12mov) engineered for CNC rebar bending machines and manual benders. Our bushings feature induction-hardened surfaces (HRC 45-55) to withstand high-torque bending operations while preventing rebar slippage and ensuring precise bending radii. Available in various diameters and heights to fit all major global bender brands.
French (Français): Douilles de cintrage pour armatures | Mandrins de cintrage | Manchons de cintreuse
Portuguese (Português): Buchas de dobramento de vergalhão | Mandris de dobra | Luvas para dobradeira
Polish (Polski): Tuleje do giętarek do prętów | Trzpienie gnące | Tuleje zginające do stali
Turkish (Türkçe): Demir Bükme Burçları | Bükme Mandrelleri | Etriye Bükme Kovanları
Vietnamese (Tiếng Việt): Bạc lót máy bẻ đai | Trục uốn sắt thép | Ống lót máy uốn cốt thép
Thai (ภาษาไทย): บูชเครื่องดัดเหล็กเส้น | แกนดัดเหล็ก | ปลอกรองเครื่องดัดเหล็ก
Filipino: Mga Bushing para sa Pagbaluktot ng Rebar | Mandrel sa Pagbaluktot ng Bakal
Arabic (العربية): جلب ثني حديد التسليح | مغازل ثني الحديد | جلب آلات ثني الكانات
Hindi (हिन्दी): सरिया मोड़ने वाली बुशिंग | बेंडिंग मैंड्रल्स | रिबार बेंडर स्लीव्स
Indonesian (Bahasa Indonesia): Bushing Mesin Tekuk Besi | Mandrel Penekuk Besi | Selongsong Mesin Begel
Malay (Bahasa Melayu): Sesendal Pembengkok Rebar | Mandrel Pembengkok | Lengan Mesin Pembengkok
Dutch (Nederlands): Wapeningsstaal buigbussen | Buigdoorns | Betonijzer buiger hulzen
Swedish (Svenska): Bockningsbussningar för armeringsjärn | Bockningsdornar | Bussningar till bockmaskin
Hungarian (Magyar): Betonvashajlító perselyek | Hajlítótüskék | Hajlítógép hüvelyek
Greek (Ελληνικά): Δακτύλιοι κάμψης οπλισμού | Μανδρέλια κουρμπαδόρου | Χιτώνια μηχανής κάμψης
Danish (Dansk): Bukkebøsninger til armeringsjern | Bukkedorne | Bøsninger til bukkemaskine
Norwegian (Norsk): Bøyebøssinger for armeringsjern | Bøyemandreller | Foringer til bøyemaskin
Finnish (Suomi): Taivutusholkit harjateräkselle | Taivutustuurnat | Taivutuskoneen holkit
Czech (Čeština): Ohýbací pouzdra na roxor | Ohýbací trny | Objímky pro ohýbačky výztuže
Romanian (Română): Bucșe de îndoit armătură | Dornuri de îndoire | Manșoane mașină de fasonat
Slovak (Slovenčina): Ohýbacie puzdrá na roxor | Ohýbacie tŕne | Objímky pre ohýbačky výstuže
Bulgarian (Български): Втулки за огъване на арматура | Дорници за огъване | Втулки за огъващи машини
Croatian (Hrvatski): Čahure za savijanje armature | Trnovi za savijanje | Čahure stroja za savijanje
Ukrainian (Українська): Втулки для згинання арматури | Оправки для згинання | Гільзи для згинальних верстатів
Azerbaijani (Azərbaycan dili): Armatur bükən maşın vtulkarı | Bükmə valları | Düzəldici qovanlar
Bengali (বাংলা): রড বাঁকানো বুশিং | বেন্ডিং ম্যান্ড্রেল | রিবার বেন্ডার স্লিভস
Tamil (தமிழ்): ரீபார் பெண்டிங் புஷிங்குகள் | பெண்டிங் மாண்ட்ரல்கள் | கம்பி வளைக்கும் புஷிங்குகள்
Persian (فارسی): بوش های خم کن میلگرد | مندریل های خم کاری | غلاف های دستگاه خم کن
Hebrew (עברית): בושינגים לכיפוף מוטות פלדה | מנדרלים לכיפוף | שרוולים למכונת כיפוף
Afrikaans: Versterkingsstaal buigbusse | Buigmandrelle | Buigmasjien hulse
