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2-18
BRONZE NUTS
FOR ACME SCREWS,
THREAD MOUNT
STYLE
For standard bronze nuts Ball Screws
and Actuators uses SAE 660 bearing
bronze which provides excellent load
carrying ability, good wear resistance
and is less susceptible to damage from
impact and shock loading. Custom
bronzes can be selected if required.
MATERIAL PROPERTIES
Maximum
Temperature
Friction
Coefficient Material*
Tensile
Strength
max. 250°F 0.2 to 0.3 660 SAE 35,000 psi
*Other materials available on a custom basis.
1/4” TO 5/8” DIAMETER
Dia. Lead
Nut
Part No.
for R.H.
Screws
Nut
Part No.
for L.H.
Screws
Bronze Nut Dimensions
Maximum
Static
Load
Torque to
Raise
1 Pound
(in-oz)A B C TH
Fits
Flange
No.
(Page 8-7)
Design
Load†
1/4
.050 BN2520 BN2520L
.625 .625 .187 9/16-18 F25 110 lbs 550 lbs
.41
.0625 BN2516 — .43
.250 BN4-2516 — 1.0
3/8
.0625 BN3716 —
.750 .750 .250 5/8-18 F37 300 lbs 1,500 lbs
.61
.0833 BN3712 BN3712L .64
.100 BN3710 BN3710L .67
.125 BN3708S — .76
.167 BN2-3712S — .86
1/2
.100 BN5010 BN5010L
1.00 1.00 .375 15/16-16 F50 620 lbs 3,100 lbs
.83
.200 BN2-5010 — 1.10
5/8
.100 BN6210 BN6210L
1.00 1.00 .375 15/16-16 F50 860 lbs 4,300 lbs
.99
.125 BN6208S — 1.06
.200 BN2-6210 — 1.26
†Load ratings based on using BS&A grease. See page 8-4.
ELECTROMATE
Toll Free Phone (877) SERVO98
Toll Free Fax (877) SERV099
www.electromate.com
sales@electromate.com
Sold & Serviced By:
2-19
BRONZE NUTS
FOR ACME SCREWS,
THREAD MOUNT STYLE
3/4” TO 3” DIAMETER
Dia. Lead
Nut
Part No.
for R.H.
Screws
Nut
Part No.
for L.H.
Screws
Bronze Nut Dimensions
Maximum
Static
Load
Torque to
Raise
1 Pound
(in-oz)A B C TH
Fits
Flange
No.
(Page 8-7)
Design
Load†
3/4
.100 BN7510 BN7510L
1.50 1.50 .500 1 3/8-16 F75 1,500 lbs 7,500 lbs
1.15
.125 BN7508 — 1.21
.167 BN7506 BN7506L 1.28
.200 BN7505 BN7505L 1.35
1
.100 BN1010 —
1.50 1.50 .500 1 3/8-16 F75 1,900 lbs 9,500 lbs
1.47
.125 BN1008 — 1.52
.200 BN1005 — 1.67
.250 BN1004 — 1.76
.500 BN5-1010 — 2.55
1.00 BN10-1010 — 3.91
1 1/4
.200 BN1205* —
1.75 1.75 .625 1 9/16-18 R1004-3 3,000 lbs 15,000 lbs
1.99
.250 BN1204* — 2.09
1 1/2
.200 BN1505* —
2.25 2.25 .530 1.967-18 R54-3 4,600 lbs 23,000 lbs
2.31
.250 BN1504* — 2.41
.375 BN1503* — 2.56
.500 BN2-1504* — 3.08
2 .250 BN2004* — 2.75 3.50 .780 2.548-18 R50-3 8,000 lbs 40,000 lbs 3.04
2 1/4 .250 BN2204* — 3.37 3.00 1.56 3.137-12 R2202-3 12,800 lbs 64,000 lbs 3.70
2 1/2 .250 BN2504* — 3.37 3.00 1.56 3.137-12 R2202-3 16,000 lbs 80,000 lbs 3.90
2 3/4 .250 BN2704* — 4.00 4.00 1.75 3.625-12 R2501-3 20,000 lbs 100,000 lbs 4.20
3 .250 BN3004* — 4.00 4.00 1.75 3.625-12 R2501-3 23,000 lbs 115,000 lbs 4.50
†Load ratings based on using BS&A grease. See page 8-4.
*Non-stock item
ELECTROMATE
Toll Free Phone (877) SERVO98
Toll Free Fax (877) SERV099
www.electromate.com
sales@electromate.com
Sold & Serviced By:
2-3
PRECISION LEAD SCREWS
& SUPERNUTS™
FEATURES/ADVANTAGES
DESIGN CONSIDERATIONS
MATERIAL PROPERTIES
LOW COST
Considerable savings when compared to ball screw
assemblies.
CUSTOM
Option of custom designs to fit into your design envelope.
VARIETY
Largest range of leads and diameters 3/16” to 4” to match
your requirements.
NON-CORROSIVE*
Stainless Steel and internally lubricated Acetal.
LUBRICATION
Internally lubricated plastic nuts will operate without
lubrication. However, additional lubrication orPTFE
coating of the screw is recommended. See page 8-4.
ENVIRONMENT
Less susceptible to particulate contamination compared to
ball screws.
VIBRATION AND NOISE
No ball recirculating vibration and often less audible
noise compared to ball screws.
LIGHTWEIGHT
Less mass to move.
LOAD
Supernuts provide a cost effective solution for moderate
to light loads. For vertical applications, anti backlash
supernuts should be mounted with thread/flange on the
bottom.
TEMPERATURE
Ambient and friction generated heat are the primary
causes of premature plastic nut failure. Observe the
temperature limits below and discuss your design with our
application engineers for continuous duty, high load and
high speed applications. BS&A recommends bronze nuts
for very high temperature environments or can aid in your
selection of high temperature plastic for a custom
assembly.
EFFICIENCY
Except at very high leads, efficiency increases as lead
increases. Although the internally lubricated Acetal
provides excellent lubricity, Ball Screw Assemblies remain
significantly more efficient than any Acme design.
LENGTH LIMITATIONS
3/16” to 1/4” 3’
5/16” to 10mm 4’
7/16” to 5/8” 6’
> 5/8” 12’
LEAD ACCURACY
Standard Grade (SRA) .010 in/ft
Precision Grade (SPR) .003 in/ft
CANTILEVERED LOADS
Cantilevered loads that might cause a moment on the nut
will cause premature failure. Refer to Precision Linear
Rails for our complete line-up of linear guides or our stage
selection in Section 4, Section 5 and Section 6 for a
complete linear motion solution.
COLUMN LOADING
Refer to column loading chart on page 9-3.
CRITICAL SPEED
Refer to critical speed chart on page 9-2.
SELF-LOCKING
Lead screws can be self locking at low leads. Generally,
the lead of the screw should be more than 1/3 of the
diameter to satisfactorily backdrive.
Assembly Screws Nuts**
Maximum
Temperature
Friction
Coefficient Material Material
Tensile
Strength
Water
Absorption
(24 hrs %)
Thermal
Expansion
Coefficient
180°F 0.08–0.14 Stainless Steel* Acetal with PTFE 8,000 psi 0.15 5.4 x 10–5
in/in/°F
*Other materials available on a custom basis.
**Plastic nuts only. See bronze nut section for information on our bronze nut products, page 2-18.
ELECTROMATE
Toll Free Phone (877) SERVO98
Toll Free Fax (877) SERV099
www.electromate.com
sales@electromate.com
Sold & Serviced By:
2-2
OVERVIEW
PRECISION LEAD SCREWS &
SUPERNUTS™
Rolled Acme lead screws are an excellent economical solu-
tion for your linear motion requirements. For over 15 years
Ball Screws and Actuators has manufactured the highest
quality lead screw assemblies. Our precision rolling
machines ensure accurate positioning to 0.003 in/ft and
our PTFE coating process produces assemblies that have
less drag torque and last longer.
Ball Screws and Actuators provides a large array of stan-
dard plastic nut assemblies in anti-backlash or standard
Supernut™ designs. For significantly higher loads, stan-
dard bronze nuts are available. BS&A also provides engi-
neering design services to aid in your custom design
requirements producing a lead—screw assembly to your
specifications.
With the introduction of our new unique patent pending
Zero-Backlash designs, BS&A provides assemblies with
high axial stiffness, zero backlash and the absolute mini-
mum drag torque to reduce motor requirements. These
designs produce products that cost less, perform better and
last longer. Both automatically adjust for wear insuring zero
backlash for the life of the nut.
Our large selection of standard plastic nut assemblies all
use an internally lubricated Acetal providing excellent
lubricity and wear resistance with or without lubrication.
For bronze nuts, BS&A uses SAE 660 bearing bronze
which provides high load capacity with good PV perfor-
mance.
BS&A offers end machining to your specification or can
provide you with stock bearing mount, motor mount or
complete stage assemblies as shown in Section 4.
ELECTROMATE
Toll Free Phone (877) SERVO98
Toll Free Fax (877) SERV099
www.electromate.com
sales@electromate.com
Sold & Serviced By:

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Thomson bronze nut_catalog

  • 1. 2-18 BRONZE NUTS FOR ACME SCREWS, THREAD MOUNT STYLE For standard bronze nuts Ball Screws and Actuators uses SAE 660 bearing bronze which provides excellent load carrying ability, good wear resistance and is less susceptible to damage from impact and shock loading. Custom bronzes can be selected if required. MATERIAL PROPERTIES Maximum Temperature Friction Coefficient Material* Tensile Strength max. 250°F 0.2 to 0.3 660 SAE 35,000 psi *Other materials available on a custom basis. 1/4” TO 5/8” DIAMETER Dia. Lead Nut Part No. for R.H. Screws Nut Part No. for L.H. Screws Bronze Nut Dimensions Maximum Static Load Torque to Raise 1 Pound (in-oz)A B C TH Fits Flange No. (Page 8-7) Design Load† 1/4 .050 BN2520 BN2520L .625 .625 .187 9/16-18 F25 110 lbs 550 lbs .41 .0625 BN2516 — .43 .250 BN4-2516 — 1.0 3/8 .0625 BN3716 — .750 .750 .250 5/8-18 F37 300 lbs 1,500 lbs .61 .0833 BN3712 BN3712L .64 .100 BN3710 BN3710L .67 .125 BN3708S — .76 .167 BN2-3712S — .86 1/2 .100 BN5010 BN5010L 1.00 1.00 .375 15/16-16 F50 620 lbs 3,100 lbs .83 .200 BN2-5010 — 1.10 5/8 .100 BN6210 BN6210L 1.00 1.00 .375 15/16-16 F50 860 lbs 4,300 lbs .99 .125 BN6208S — 1.06 .200 BN2-6210 — 1.26 †Load ratings based on using BS&A grease. See page 8-4. ELECTROMATE Toll Free Phone (877) SERVO98 Toll Free Fax (877) SERV099 www.electromate.com sales@electromate.com Sold & Serviced By:
  • 2. 2-19 BRONZE NUTS FOR ACME SCREWS, THREAD MOUNT STYLE 3/4” TO 3” DIAMETER Dia. Lead Nut Part No. for R.H. Screws Nut Part No. for L.H. Screws Bronze Nut Dimensions Maximum Static Load Torque to Raise 1 Pound (in-oz)A B C TH Fits Flange No. (Page 8-7) Design Load† 3/4 .100 BN7510 BN7510L 1.50 1.50 .500 1 3/8-16 F75 1,500 lbs 7,500 lbs 1.15 .125 BN7508 — 1.21 .167 BN7506 BN7506L 1.28 .200 BN7505 BN7505L 1.35 1 .100 BN1010 — 1.50 1.50 .500 1 3/8-16 F75 1,900 lbs 9,500 lbs 1.47 .125 BN1008 — 1.52 .200 BN1005 — 1.67 .250 BN1004 — 1.76 .500 BN5-1010 — 2.55 1.00 BN10-1010 — 3.91 1 1/4 .200 BN1205* — 1.75 1.75 .625 1 9/16-18 R1004-3 3,000 lbs 15,000 lbs 1.99 .250 BN1204* — 2.09 1 1/2 .200 BN1505* — 2.25 2.25 .530 1.967-18 R54-3 4,600 lbs 23,000 lbs 2.31 .250 BN1504* — 2.41 .375 BN1503* — 2.56 .500 BN2-1504* — 3.08 2 .250 BN2004* — 2.75 3.50 .780 2.548-18 R50-3 8,000 lbs 40,000 lbs 3.04 2 1/4 .250 BN2204* — 3.37 3.00 1.56 3.137-12 R2202-3 12,800 lbs 64,000 lbs 3.70 2 1/2 .250 BN2504* — 3.37 3.00 1.56 3.137-12 R2202-3 16,000 lbs 80,000 lbs 3.90 2 3/4 .250 BN2704* — 4.00 4.00 1.75 3.625-12 R2501-3 20,000 lbs 100,000 lbs 4.20 3 .250 BN3004* — 4.00 4.00 1.75 3.625-12 R2501-3 23,000 lbs 115,000 lbs 4.50 †Load ratings based on using BS&A grease. See page 8-4. *Non-stock item ELECTROMATE Toll Free Phone (877) SERVO98 Toll Free Fax (877) SERV099 www.electromate.com sales@electromate.com Sold & Serviced By:
  • 3. 2-3 PRECISION LEAD SCREWS & SUPERNUTS™ FEATURES/ADVANTAGES DESIGN CONSIDERATIONS MATERIAL PROPERTIES LOW COST Considerable savings when compared to ball screw assemblies. CUSTOM Option of custom designs to fit into your design envelope. VARIETY Largest range of leads and diameters 3/16” to 4” to match your requirements. NON-CORROSIVE* Stainless Steel and internally lubricated Acetal. LUBRICATION Internally lubricated plastic nuts will operate without lubrication. However, additional lubrication orPTFE coating of the screw is recommended. See page 8-4. ENVIRONMENT Less susceptible to particulate contamination compared to ball screws. VIBRATION AND NOISE No ball recirculating vibration and often less audible noise compared to ball screws. LIGHTWEIGHT Less mass to move. LOAD Supernuts provide a cost effective solution for moderate to light loads. For vertical applications, anti backlash supernuts should be mounted with thread/flange on the bottom. TEMPERATURE Ambient and friction generated heat are the primary causes of premature plastic nut failure. Observe the temperature limits below and discuss your design with our application engineers for continuous duty, high load and high speed applications. BS&A recommends bronze nuts for very high temperature environments or can aid in your selection of high temperature plastic for a custom assembly. EFFICIENCY Except at very high leads, efficiency increases as lead increases. Although the internally lubricated Acetal provides excellent lubricity, Ball Screw Assemblies remain significantly more efficient than any Acme design. LENGTH LIMITATIONS 3/16” to 1/4” 3’ 5/16” to 10mm 4’ 7/16” to 5/8” 6’ > 5/8” 12’ LEAD ACCURACY Standard Grade (SRA) .010 in/ft Precision Grade (SPR) .003 in/ft CANTILEVERED LOADS Cantilevered loads that might cause a moment on the nut will cause premature failure. Refer to Precision Linear Rails for our complete line-up of linear guides or our stage selection in Section 4, Section 5 and Section 6 for a complete linear motion solution. COLUMN LOADING Refer to column loading chart on page 9-3. CRITICAL SPEED Refer to critical speed chart on page 9-2. SELF-LOCKING Lead screws can be self locking at low leads. Generally, the lead of the screw should be more than 1/3 of the diameter to satisfactorily backdrive. Assembly Screws Nuts** Maximum Temperature Friction Coefficient Material Material Tensile Strength Water Absorption (24 hrs %) Thermal Expansion Coefficient 180°F 0.08–0.14 Stainless Steel* Acetal with PTFE 8,000 psi 0.15 5.4 x 10–5 in/in/°F *Other materials available on a custom basis. **Plastic nuts only. See bronze nut section for information on our bronze nut products, page 2-18. ELECTROMATE Toll Free Phone (877) SERVO98 Toll Free Fax (877) SERV099 www.electromate.com sales@electromate.com Sold & Serviced By:
  • 4. 2-2 OVERVIEW PRECISION LEAD SCREWS & SUPERNUTS™ Rolled Acme lead screws are an excellent economical solu- tion for your linear motion requirements. For over 15 years Ball Screws and Actuators has manufactured the highest quality lead screw assemblies. Our precision rolling machines ensure accurate positioning to 0.003 in/ft and our PTFE coating process produces assemblies that have less drag torque and last longer. Ball Screws and Actuators provides a large array of stan- dard plastic nut assemblies in anti-backlash or standard Supernut™ designs. For significantly higher loads, stan- dard bronze nuts are available. BS&A also provides engi- neering design services to aid in your custom design requirements producing a lead—screw assembly to your specifications. With the introduction of our new unique patent pending Zero-Backlash designs, BS&A provides assemblies with high axial stiffness, zero backlash and the absolute mini- mum drag torque to reduce motor requirements. These designs produce products that cost less, perform better and last longer. Both automatically adjust for wear insuring zero backlash for the life of the nut. Our large selection of standard plastic nut assemblies all use an internally lubricated Acetal providing excellent lubricity and wear resistance with or without lubrication. For bronze nuts, BS&A uses SAE 660 bearing bronze which provides high load capacity with good PV perfor- mance. BS&A offers end machining to your specification or can provide you with stock bearing mount, motor mount or complete stage assemblies as shown in Section 4. ELECTROMATE Toll Free Phone (877) SERVO98 Toll Free Fax (877) SERV099 www.electromate.com sales@electromate.com Sold & Serviced By: